[PATCH v7 3/3] drm/bridge: add it6505 driver

From: allen
Date: Mon Mar 09 2020 - 02:42:19 EST

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From: Allen Chen <allen.chen@xxxxxxxxxx>

This adds support for the iTE IT6505.
This device can convert DPI signal to DP output.

Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
Signed-off-by: Yilun Lin <yllin@xxxxxxxxxx>
Signed-off-by: Allen Chen <allen.chen@xxxxxxxxxx>
Signed-off-by: Pi-Hsun Shih <pihsun@xxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/Kconfig | 11 +-
drivers/gpu/drm/bridge/Makefile | 6 +-
drivers/gpu/drm/bridge/ite-it6505.c | 3022 +++++++++++++++++++++++++++++++++++
3 files changed, 3035 insertions(+), 4 deletions(-)
create mode 100644 drivers/gpu/drm/bridge/ite-it6505.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index aaed234..ff81681 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -38,8 +38,15 @@ config DRM_DISPLAY_CONNECTOR
on ARM-based platforms. Saying Y here when this driver is not needed
will not cause any issue.

-config DRM_LVDS_CODEC
- tristate "Transparent LVDS encoders and decoders support"
+config DRM_ITE_IT6505
+ tristate "ITE IT6505 DP bridge"
+ depends on OF
+ select DRM_KMS_HELPER
+ help
+ ITE IT6505 DP bridge chip driver.
+
+config DRM_LVDS_ENCODER
+ tristate "Transparent parallel to LVDS encoder support"
depends on OF
select DRM_KMS_HELPER
select DRM_PANEL_BRIDGE
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 6fb062b..e6c80ab 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,7 +1,9 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
-obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
-obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
+obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
+obj-$(CONFIG_DRM_GENERIC_GPIO_MUX) += generic-gpio-mux.o
+obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o
+obj-$(CONFIG_DRM_LVDS_ENCODER) += lvds-encoder.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c
new file mode 100644
index 00000000..bbae6fd
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ite-it6505.c
@@ -0,0 +1,3022 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/extcon.h>
+#include <linux/fs.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/types.h>
+
+#include <crypto/hash.h>
+#include <crypto/sha.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_print.h>
+#include <drm/drm_probe_helper.h>
+
+#include <sound/hdmi-codec.h>
+
+/* Vendor option */
+#define AUDIO_SELECT I2S
+#define AUDIO_TYPE LPCM
+#define AUDIO_SAMPLE_RATE SAMPLE_RATE_48K
+#define AUDIO_CHANNEL_COUNT 2
+
+/*
+ * 0: Standard I2S
+ * 1: 32bit I2S
+ */
+#define I2S_INPUT_FORMAT 1
+
+/*
+ * 0: Left-justified
+ * 1: Right-justified
+ */
+#define I2S_JUSTIFIED 0
+
+/*
+ * 0: Data delay 1T correspond to WS
+ * 1: No data delay correspond to WS
+ */
+#define I2S_DATA_DELAY 0
+
+/*
+ * 0: Left channel
+ * 1: Right channel
+ */
+#define I2S_WS_CHANNEL 0
+
+/*
+ * 0: MSB shift first
+ * 1: LSB shift first
+ */
+#define I2S_DATA_SEQUENCE 0
+
+/*
+ * IT6505 maximum link rate
+ * RBR : 1.62 Gbps/lane
+ * HBR : 2.7 Gbps/lane
+ * HBR2: 5.4 Gbps/lane
+ * HBR3: 8.1 Gbps/lane
+ */
+#define MAX_LINK_RATE HBR
+
+/* IT6505 maximum lane count */
+#define MAX_LANE_COUNT 4
+
+#define TRAINING_LINK_RATE HBR
+#define TRAINING_LANE_COUNT 4
+#define ENABLE_DP_LANE_SWAP 0
+#define AUX_WAIT_TIMEOUT_MS 15
+#define PIXEL_CLK_DELAY 1
+#define PIXEL_CLK_INVERSE 0
+#define ADJUST_PHASE_THRESHOLD 80000
+#define MAX_PIXEL_CLK 95000
+#define DEFAULT_DRV_HOLD 0
+#define DEFAULT_PWR_ON 0
+#define AUX_FIFO_MAX_SIZE 0x10
+
+/*
+ * Vendor option afe settings for different platforms
+ * 0: for bitland 10e, quanta zde
+ * 1: for google kukui p1/p2, huaqin krane
+ */
+
+static u8 afe_setting_table[2][3] = {
+ {0, 0, 0},
+ {0x93, 0x2A, 0x85}
+};
+
+enum it6505_sys_state {
+ SYS_UNPLUG = 0,
+ SYS_HPD,
+ SYS_TRAIN,
+ SYS_WAIT,
+ SYS_TRAINFAIL,
+ SYS_HDCP,
+ SYS_NOROP,
+ SYS_UNKNOWN,
+};
+
+enum it6505_audio_select {
+ I2S = 0,
+ SPDIF,
+};
+
+enum it6505_audio_sample_rate {
+ SAMPLE_RATE_24K = 0x6,
+ SAMPLE_RATE_32K = 0x3,
+ SAMPLE_RATE_48K = 0x2,
+ SAMPLE_RATE_96K = 0xA,
+ SAMPLE_RATE_192K = 0xE,
+ SAMPLE_RATE_44_1K = 0x0,
+ SAMPLE_RATE_88_2K = 0x8,
+ SAMPLE_RATE_176_4K = 0xC,
+ SAMPLE_RATE_UNKNOWN = 0xFF,
+};
+
+enum it6505_audio_type {
+ LPCM = 0,
+ NLPCM,
+ DSS,
+};
+
+enum it6505_audio_word_length {
+ WORD_LENGTH_16BIT = 0,
+ WORD_LENGTH_18BIT,
+ WORD_LENGTH_20BIT,
+ WORD_LENGTH_24BIT,
+};
+
+/*
+ * Audio Sample Word Length
+ * WORD_LENGTH_16BIT
+ * WORD_LENGTH_18BIT
+ * WORD_LENGTH_20BIT
+ * WORD_LENGTH_24BIT
+ */
+#define AUDIO_WORD_LENGTH WORD_LENGTH_24BIT
+
+enum it6505_link_rate {
+ RBR,
+ HBR,
+ HBR2,
+ HBR3,
+};
+
+struct it6505_audio_sample_rate_map {
+ enum it6505_audio_sample_rate rate;
+ int sample_rate_value;
+};
+
+struct it6505_platform_data {
+ struct regulator *pwr18;
+ struct regulator *ovdd;
+ struct gpio_desc *gpiod_hpd;
+ struct gpio_desc *gpiod_reset;
+};
+
+struct it6505_drm_dp_link {
+ unsigned char revision;
+ unsigned int rate;
+ unsigned int num_lanes;
+ unsigned long capabilities;
+};
+
+struct it6505 {
+ struct drm_dp_aux aux;
+ struct drm_bridge bridge;
+ struct i2c_client *client;
+ struct edid *edid;
+ struct drm_connector connector;
+ struct it6505_drm_dp_link link;
+ struct it6505_platform_data pdata;
+ struct mutex lock;
+ struct mutex mode_lock;
+ struct regmap *regmap;
+ struct drm_display_mode video_info;
+
+ struct notifier_block event_nb;
+ struct extcon_dev *extcon;
+ struct work_struct extcon_wq;
+ enum it6505_sys_state state;
+ bool hbr;
+ u8 lane_count;
+ bool enable_ssc;
+ bool lane_swap_disabled;
+ bool lane_swap;
+
+ enum it6505_audio_select audio_select;
+ enum it6505_audio_sample_rate audio_sample_rate;
+ enum it6505_audio_type audio_type;
+ enum it6505_audio_word_length audio_word_length;
+ u8 audio_channel_count;
+ u8 i2s_input_format;
+ u8 i2s_justified;
+ u8 i2s_data_delay;
+ u8 i2s_ws_channel;
+ u8 i2s_data_sequence;
+ bool hdcp_flag;
+ bool enable_hdcp;
+ bool enable_audio;
+ u8 train_count;
+ u8 train_fail_hpd;
+ bool train_pass;
+ bool enable_auto_train;
+ bool cp_capable;
+ u8 sha1_input[64];
+ u8 av[5][4];
+ u8 bv[5][4];
+ u8 dpcd[DP_RECEIVER_CAP_SIZE];
+ bool powered;
+ u8 dpcd_sink_count;
+ /* it6505 driver hold option */
+ bool enable_drv_hold;
+};
+
+struct it6505_lane_voltage_pre_emphasis {
+ u8 voltage_swing[MAX_LANE_COUNT];
+ u8 pre_emphasis[MAX_LANE_COUNT];
+};
+
+static const struct regmap_range it6505_bridge_volatile_ranges[] = {
+ { .range_min = 0, .range_max = 0xFF },
+};
+
+static const struct regmap_access_table it6505_bridge_volatile_table = {
+ .yes_ranges = it6505_bridge_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(it6505_bridge_volatile_ranges),
+};
+
+static const struct regmap_config it6505_bridge_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = &it6505_bridge_volatile_table,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int dptx_read(struct it6505 *it6505, unsigned int reg_addr)
+{
+ unsigned int value;
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ err = regmap_read(it6505->regmap, reg_addr, &value);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "read failed reg[0x%x] err: %d", reg_addr,
+ err);
+ return err;
+ }
+
+ return value;
+}
+
+static void dptx_debug_dump(struct it6505 *it6505)
+{
+ unsigned int i, j;
+ u8 regs[16];
+ struct device *dev = &it6505->client->dev;
+
+ for (i = 0; i <= 0xff; i += 16) {
+ for (j = 0; j < 16; j++)
+ regs[j] = dptx_read(it6505, i + j);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x] = %16ph", i, regs);
+ }
+}
+
+static int dptx_write(struct it6505 *it6505, unsigned int reg_addr,
+ unsigned int reg_val)
+{
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ err = regmap_write(it6505->regmap, reg_addr, reg_val);
+
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "write failed reg[0x%x] = 0x%x err = %d",
+ reg_addr, reg_val, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static int dptx_set_bits(struct it6505 *it6505, unsigned int reg,
+ unsigned int mask, unsigned int value)
+{
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ err = regmap_update_bits(it6505->regmap, reg, mask, value);
+ if (err < 0) {
+ DRM_DEV_ERROR(
+ dev, "write reg[0x%x] = 0x%x mask = 0x%x failed err %d",
+ reg, value, mask, err);
+ return err;
+ }
+
+ return 0;
+}
+
+static unsigned int dpcd_read(struct it6505 *it6505, unsigned long offset)
+{
+ u8 value;
+ int ret;
+ struct device *dev = &it6505->client->dev;
+
+ ret = drm_dp_dpcd_readb(&it6505->aux, offset, &value);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "DPCD read failed [0x%lx] ret: %d", offset,
+ ret);
+ return ret;
+ }
+ return value;
+}
+
+static int dpcd_write(struct it6505 *it6505, unsigned long offset,
+ unsigned long datain)
+{
+ int ret;
+ struct device *dev = &it6505->client->dev;
+
+ ret = drm_dp_dpcd_writeb(&it6505->aux, offset, datain);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "DPCD write failed [0x%lx] ret: %d", offset,
+ ret);
+ return ret;
+ }
+ return 0;
+}
+
+static void dptx_debug_print(struct it6505 *it6505, unsigned int reg,
+ const char *prefix)
+{
+ int val;
+ struct device *dev = &it6505->client->dev;
+
+ if (likely(!(__drm_debug & DRM_UT_DRIVER)))
+ return;
+
+ val = dptx_read(it6505, reg);
+ if (val < 0)
+ DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] read error (%d)",
+ prefix, reg, val);
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "%s reg[%02x] = 0x%02x", prefix, reg,
+ val);
+}
+
+static void dpcd_debug_print(struct it6505 *it6505, unsigned int reg,
+ const char *prefix)
+{
+ unsigned int val;
+ struct device *dev = &it6505->client->dev;
+
+ if (likely(!(__drm_debug & DRM_UT_DRIVER)))
+ return;
+
+ val = dpcd_read(it6505, reg);
+ if (val < 0)
+ DRM_DEV_DEBUG_DRIVER(dev, "%s reg%02x read error", prefix, reg);
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "%s DPCD%02x = 0x%02x", prefix, reg,
+ val);
+}
+
+static int it6505_drm_dp_link_probe(struct drm_dp_aux *aux,
+ struct it6505_drm_dp_link *link)
+{
+ u8 values[3];
+ int err;
+
+ memset(link, 0, sizeof(*link));
+
+ err = drm_dp_dpcd_read(aux, DP_DPCD_REV, values, sizeof(values));
+ if (err < 0)
+ return err;
+
+ link->revision = values[0];
+ link->rate = drm_dp_bw_code_to_link_rate(values[1]);
+ link->num_lanes = values[2] & DP_MAX_LANE_COUNT_MASK;
+
+ if (values[2] & DP_ENHANCED_FRAME_CAP)
+ link->capabilities = 1;
+
+ return 0;
+}
+
+static int it6505_drm_dp_link_power_up(struct drm_dp_aux *aux,
+ struct it6505_drm_dp_link *link)
+{
+ u8 value;
+ int err;
+
+ /* DP_SET_POWER register is only available on DPCD v1.1 and later */
+ if (link->revision < 0x11)
+ return 0;
+
+ err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
+ if (err < 0)
+ return err;
+
+ value &= ~DP_SET_POWER_MASK;
+ value |= DP_SET_POWER_D0;
+
+ err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
+ if (err < 0)
+ return err;
+
+ /*
+ * According to the DP 1.1 specification, a "Sink Device must exit the
+ * power saving state within 1 ms" (Section 2.5.3.1, Table 5-52, "Sink
+ * Control Field" (register 0x600).
+ */
+ usleep_range(1000, 2000);
+
+ return 0;
+}
+
+static int it6505_drm_dp_link_configure(struct it6505 *it6505)
+{
+ u8 values[2];
+ int err;
+ struct it6505_drm_dp_link *link = &it6505->link;
+ struct drm_dp_aux *aux = &it6505->aux;
+
+ values[0] = it6505->hbr ? DP_LINK_BW_2_7 : DP_LINK_BW_1_62;
+ values[1] = link->num_lanes;
+
+ if (link->capabilities)
+ values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
+
+ err = drm_dp_dpcd_write(aux, DP_LINK_BW_SET, values, sizeof(values));
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+static inline struct it6505 *connector_to_it6505(struct drm_connector *c)
+{
+ return container_of(c, struct it6505, connector);
+}
+
+static inline struct it6505 *bridge_to_it6505(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct it6505, bridge);
+}
+
+static void it6505_init_variable(struct it6505 *it6505)
+{
+ it6505->audio_select = AUDIO_SELECT;
+ it6505->audio_sample_rate = AUDIO_SAMPLE_RATE;
+ it6505->audio_channel_count = AUDIO_CHANNEL_COUNT;
+ it6505->audio_type = AUDIO_TYPE;
+ it6505->i2s_input_format = I2S_INPUT_FORMAT;
+ it6505->i2s_justified = I2S_JUSTIFIED;
+ it6505->i2s_data_delay = I2S_DATA_DELAY;
+ it6505->i2s_ws_channel = I2S_WS_CHANNEL;
+ it6505->i2s_data_sequence = I2S_DATA_SEQUENCE;
+ it6505->audio_word_length = AUDIO_WORD_LENGTH;
+ it6505->enable_audio = false;
+ it6505->enable_hdcp = true;
+ it6505->lane_count = min(MAX_LANE_COUNT, TRAINING_LANE_COUNT);
+ it6505->hbr = min(MAX_LINK_RATE, TRAINING_LINK_RATE) ? true : false;
+ it6505->enable_ssc = true;
+ it6505->lane_swap = ENABLE_DP_LANE_SWAP ? true : false;
+ it6505->train_pass = false;
+}
+
+static void it6505_lane_termination_on(struct it6505 *it6505)
+{
+ if (dptx_read(it6505, 0xCF) == 0xF0)
+ dptx_set_bits(it6505, 0x5D, 0x80, 0x00);
+
+ if (dptx_read(it6505, 0xCF) == 0x70) {
+ if (it6505->lane_swap) {
+ switch (it6505->lane_count) {
+ case 1:
+ case 2:
+ dptx_set_bits(it6505, 0x5D, 0x0C, 0x08);
+ break;
+ default:
+ dptx_set_bits(it6505, 0x5D, 0x0C, 0x0C);
+ break;
+ }
+ } else {
+ switch (it6505->lane_count) {
+ case 1:
+ case 2:
+ dptx_set_bits(it6505, 0x5D, 0x0C, 0x04);
+ break;
+ default:
+ dptx_set_bits(it6505, 0x5D, 0x0C, 0x0C);
+ break;
+ }
+ }
+ }
+}
+
+static void it6505_lane_termination_off(struct it6505 *it6505)
+{
+ if (dptx_read(it6505, 0xCF) == 0xF0)
+ dptx_set_bits(it6505, 0x5D, 0x80, 0x80);
+
+ if (dptx_read(it6505, 0xCF) == 0x70)
+ dptx_set_bits(it6505, 0x5D, 0x0C, 0x00);
+}
+
+static void it6505_lane_power_on(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x5C, 0xF1, ((BIT(it6505->lane_count) - 1) <<
+ (it6505->lane_swap ? (8 - it6505->lane_count) : 4)) | 0x01);
+}
+
+static void it6505_lane_power_off(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x5C, 0xF0, 0x00);
+}
+
+static void it6505_lane_off(struct it6505 *it6505)
+{
+ it6505_lane_power_off(it6505);
+ it6505_lane_termination_off(it6505);
+}
+
+static void it6505_aux_termination_on(struct it6505 *it6505)
+{
+ if (dptx_read(it6505, 0xCF) == 0xF0)
+ it6505_lane_termination_on(it6505);
+
+ if (dptx_read(it6505, 0xCF) == 0x70)
+ dptx_set_bits(it6505, 0x5D, 0x80, 0x80);
+}
+
+static void it6505_aux_power_on(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x5E, 0x02, 0x02);
+}
+
+static void it6505_aux_on(struct it6505 *it6505)
+{
+ it6505_aux_power_on(it6505);
+ it6505_aux_termination_on(it6505);
+}
+
+static void it6505_aux_reset(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x05, 0x08, 0x08);
+ dptx_set_bits(it6505, 0x05, 0x08, 0x00);
+}
+
+static bool dptx_get_sink_hpd(struct it6505 *it6505)
+{
+ int reg0d = dptx_read(it6505, 0x0D);
+
+ if (reg0d < 0)
+ return false;
+
+ return (reg0d & BIT(1)) == BIT(1);
+}
+
+static void dptx_select_bank(struct it6505 *it6505, unsigned int bank_id)
+{
+ dptx_set_bits(it6505, 0x0F, 0x01, bank_id & BIT(0));
+}
+
+static void it6505_int_mask_on(struct it6505 *it6505)
+{
+ dptx_write(it6505, 0x09, 0x1F);
+ dptx_write(it6505, 0x0A, 0x07);
+ dptx_write(it6505, 0x0B, 0x90);
+}
+
+static void it6505_int_mask_off(struct it6505 *it6505)
+{
+ dptx_write(it6505, 0x09, 0x00);
+ dptx_write(it6505, 0x0A, 0x00);
+ dptx_write(it6505, 0x0B, 0x00);
+}
+
+static void dptx_init(struct it6505 *it6505)
+{
+ dptx_write(it6505, 0x05, 0x3B);
+ usleep_range(1000, 2000);
+ dptx_write(it6505, 0x05, 0x1F);
+ usleep_range(1000, 1500);
+}
+
+static void it6505_init_and_mask_on(struct it6505 *it6505)
+{
+ dptx_init(it6505);
+ it6505_int_mask_on(it6505);
+}
+
+static int it6505_poweron(struct it6505 *it6505)
+{
+ struct it6505_platform_data *pdata = &it6505->pdata;
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ if (it6505->powered) {
+ DRM_DEV_DEBUG_DRIVER(dev, "it6505 already powered on");
+ return 0;
+ }
+
+ DRM_DEV_DEBUG_DRIVER(dev, "it6505 start to power on");
+
+ err = regulator_enable(pdata->pwr18);
+
+ if (err)
+ return err;
+
+ /* time interval between IVDD and OVDD at least be 1ms */
+ usleep_range(1000, 2000);
+ err = regulator_enable(pdata->ovdd);
+
+ if (err) {
+ regulator_disable(pdata->pwr18);
+ return err;
+ }
+ /* time interval between OVDD and SYSRSTN at least be 10ms */
+ usleep_range(10000, 20000);
+ gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
+ usleep_range(1000, 2000);
+ gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
+ usleep_range(10000, 20000);
+
+ it6505_init_and_mask_on(it6505);
+ it6505->powered = true;
+ return 0;
+}
+
+static int it6505_poweroff(struct it6505 *it6505)
+{
+ struct it6505_platform_data *pdata = &it6505->pdata;
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ if (!it6505->powered) {
+ DRM_DEV_DEBUG_DRIVER(dev, "power had been already off");
+ return 0;
+ }
+ gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
+ err = regulator_disable(pdata->pwr18);
+
+ if (err)
+ return err;
+
+ err = regulator_disable(pdata->ovdd);
+
+ if (err)
+ return err;
+
+ kfree(it6505->edid);
+ it6505->edid = NULL;
+ it6505->powered = false;
+ return 0;
+}
+
+static int dptx_read_word(struct it6505 *it6505, unsigned int reg)
+{
+ int val0, val1;
+
+ val0 = dptx_read(it6505, reg);
+ if (val0 < 0)
+ return val0;
+
+ val1 = dpcd_read(it6505, reg + 1);
+ if (val1 < 0)
+ return val1;
+
+ return (val1 << 8) | val0;
+}
+
+static void show_video_info(struct it6505 *it6505)
+{
+ int hsync_pol, vsync_pol, interlaced;
+ int htotal, hdes, hdew, hfph, hsyncw;
+ int vtotal, vdes, vdew, vfph, vsyncw;
+ int rddata, i;
+ int pclk, sum;
+
+ usleep_range(10000, 15000);
+ dptx_select_bank(it6505, 0);
+ rddata = dptx_read(it6505, 0xA0);
+ hsync_pol = rddata & BIT(0);
+ vsync_pol = (rddata & BIT(2)) >> 2;
+ interlaced = (rddata & BIT(4)) >> 4;
+
+ htotal = dptx_read_word(it6505, 0xA1) & 0x1FFF;
+ hdes = dptx_read_word(it6505, 0xA3) & 0x1FFF;
+ hdew = dptx_read_word(it6505, 0xA5) & 0x1FFF;
+ hfph = dptx_read_word(it6505, 0xA7) & 0x1FFF;
+ hsyncw = dptx_read_word(it6505, 0xA9) & 0x1FFF;
+
+ vtotal = dptx_read_word(it6505, 0xAB) & 0xFFF;
+ vdes = dptx_read_word(it6505, 0xAD) & 0xFFF;
+ vdew = dptx_read_word(it6505, 0xAF) & 0xFFF;
+ vfph = dptx_read_word(it6505, 0xB1) & 0xFFF;
+ vsyncw = dptx_read_word(it6505, 0xB3) & 0xFFF;
+
+ sum = 0;
+ for (i = 0; i < 100; i++) {
+ dptx_set_bits(it6505, 0x12, 0x80, 0x80);
+ usleep_range(10000, 15000);
+ dptx_set_bits(it6505, 0x12, 0x80, 0x00);
+ rddata = dptx_read_word(it6505, 0x13) & 0xFFF;
+
+ sum += rddata;
+ }
+
+ sum /= 100;
+ pclk = 13500 * 2048 / sum;
+ it6505->video_info.clock = pclk;
+ it6505->video_info.hdisplay = hdew;
+ it6505->video_info.hsync_start = hdew + hfph;
+ it6505->video_info.hsync_end = hdew + hfph + hsyncw;
+ it6505->video_info.htotal = htotal;
+ it6505->video_info.vdisplay = vdew;
+ it6505->video_info.vsync_start = vdew + vfph;
+ it6505->video_info.vsync_end = vdew + vfph + vsyncw;
+ it6505->video_info.vtotal = vtotal;
+ it6505->video_info.vrefresh = pclk / htotal / vtotal;
+
+ DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, DRM_MODE_FMT,
+ DRM_MODE_ARG(&it6505->video_info));
+}
+
+static const struct it6505_audio_sample_rate_map audio_sample_rate_map[] = {
+ {SAMPLE_RATE_24K, 24000},
+ {SAMPLE_RATE_32K, 32000},
+ {SAMPLE_RATE_48K, 48000},
+ {SAMPLE_RATE_96K, 96000},
+ {SAMPLE_RATE_192K, 192000},
+ {SAMPLE_RATE_44_1K, 44100},
+ {SAMPLE_RATE_88_2K, 88200},
+ {SAMPLE_RATE_176_4K, 176400},
+ {SAMPLE_RATE_UNKNOWN, 0},
+};
+
+static void show_audio_m_count(struct it6505 *it6505)
+{
+ unsigned int audio_n, vclk, aclk, audio_m_cal, audio_m_count, i;
+ struct device *dev = &it6505->client->dev;
+
+ vclk = it6505->hbr ? 2700000 : 1620000;
+
+ for (i = 0; audio_sample_rate_map[i].rate != SAMPLE_RATE_UNKNOWN; i++) {
+ if (it6505->audio_sample_rate ==
+ audio_sample_rate_map[i].rate) {
+ aclk = audio_sample_rate_map[i].sample_rate_value / 100;
+ break;
+ }
+ }
+
+ if (audio_sample_rate_map[i].rate == SAMPLE_RATE_UNKNOWN)
+ aclk = audio_sample_rate_map[i].sample_rate_value;
+
+ audio_n = (dptx_read(it6505, 0xE0) << 16) +
+ (dptx_read(it6505, 0xDF) << 8) + dptx_read(it6505, 0xDE);
+ audio_m_cal = audio_n * aclk / vclk * 512;
+ audio_m_count = (dptx_read(it6505, 0xE6) << 16) +
+ (dptx_read(it6505, 0xE5) << 8) + dptx_read(it6505, 0xE4);
+ DRM_DEV_DEBUG_DRIVER(dev, "audio N:0x%06x", audio_n);
+ DRM_DEV_DEBUG_DRIVER(dev, "audio M cal:0x%06x", audio_m_cal);
+ DRM_DEV_DEBUG_DRIVER(dev, "audio M count:0x%06x", audio_m_count);
+}
+
+static void it6505_audio_disable(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0xD3, 0x20, 0x20);
+ dptx_set_bits(it6505, 0xB8, 0x0F, 0x00);
+ dptx_set_bits(it6505, 0xE8, 0x22, 0x00);
+ dptx_set_bits(it6505, 0x05, 0x02, 0x02);
+ it6505->enable_audio = false;
+}
+
+static const char *const state_string[] = {
+ [SYS_UNPLUG] = "SYS_UNPLUG",
+ [SYS_HPD] = "SYS_HPD",
+ [SYS_TRAIN] = "SYS_TRAIN",
+ [SYS_WAIT] = "SYS_WAIT",
+ [SYS_TRAINFAIL] = "SYS_TRAINFAIL",
+ [SYS_HDCP] = "SYS_HDCP",
+ [SYS_NOROP] = "SYS_NOROP",
+ [SYS_UNKNOWN] = "SYS_UNKNOWN",
+};
+
+static void dptx_sys_chg(struct it6505 *it6505, enum it6505_sys_state newstate)
+{
+ int i;
+ struct device *dev = &it6505->client->dev;
+
+ if (newstate != SYS_UNPLUG) {
+ if (!dptx_get_sink_hpd(it6505))
+ newstate = SYS_UNPLUG;
+ }
+
+ DRM_DEV_DEBUG_DRIVER(dev, "sys_state change: %s -> %s",
+ state_string[it6505->state],
+ state_string[newstate]);
+ it6505->state = newstate;
+
+ switch (it6505->state) {
+ case SYS_UNPLUG:
+ kfree(it6505->edid);
+ it6505->edid = NULL;
+ DRM_DEV_DEBUG_DRIVER(dev, "Free it6505 EDID memory");
+
+ if (it6505->enable_audio)
+ it6505_audio_disable(it6505);
+
+ if (it6505->powered) {
+ it6505_init_and_mask_on(it6505);
+ it6505_lane_off(it6505);
+ }
+ break;
+ case SYS_HPD:
+ it6505_aux_on(it6505);
+ break;
+ case SYS_TRAIN:
+ break;
+ case SYS_WAIT:
+ break;
+ case SYS_HDCP:
+ break;
+ case SYS_NOROP:
+ it6505->enable_auto_train = true;
+ for (i = 0; i < 3; i++)
+ show_video_info(it6505);
+ break;
+ case SYS_TRAINFAIL:
+ /* it6505 goes to idle */
+ it6505->enable_auto_train = true;
+ break;
+ default:
+ break;
+ }
+}
+
+static bool it6505_aux_op_finished(struct it6505 *it6505)
+{
+ int reg2b = dptx_read(it6505, 0x2B);
+
+ if (reg2b < 0)
+ return false;
+
+ return (reg2b & BIT(5)) == 0;
+}
+
+static int dptx_aux_wait(struct it6505 *it6505)
+{
+ int status;
+ unsigned long timeout;
+ struct device *dev = &it6505->client->dev;
+
+ timeout = jiffies + msecs_to_jiffies(AUX_WAIT_TIMEOUT_MS) + 1;
+
+ while (!it6505_aux_op_finished(it6505)) {
+ if (time_after(jiffies, timeout)) {
+ DRM_DEV_ERROR(dev, "Timed out waiting AUX to finish");
+ return -ETIMEDOUT;
+ }
+ usleep_range(1000, 2000);
+ }
+
+ status = dptx_read(it6505, 0x9F);
+ if (status < 0) {
+ DRM_DEV_ERROR(dev, "Failed to read AUX channel: %d", status);
+ return status;
+ }
+
+ if (status & 0x03) {
+ DRM_DEV_ERROR(dev, "Failed to wait for AUX (status: 0x%x)",
+ status);
+ return -ETIMEDOUT;
+ }
+
+ return 0;
+}
+
+enum aux_cmd_type {
+ CMD_AUX_NATIVE_READ = 0x0,
+ CMD_AUX_NATIVE_WRITE = 0x5,
+ CMD_AUX_I2C_EDID_READ = 0xB,
+};
+
+enum aux_cmd_reply {
+ REPLY_ACK,
+ REPLY_NACK,
+ REPLY_DEFER,
+};
+
+static ssize_t it6505_aux_do_transfer(struct it6505 *it6505,
+ enum aux_cmd_type cmd,
+ unsigned int address, u8 *buffer,
+ size_t size, enum aux_cmd_reply *reply)
+{
+ int i;
+ int status;
+
+ if (cmd == CMD_AUX_I2C_EDID_READ) {
+ /* DP AUX EDID FIFO has maximum length of 16 bytes. */
+ size = min_t(size_t, size, AUX_FIFO_MAX_SIZE);
+ /* Enable AUX FIFO read back and clear FIFO */
+ dptx_write(it6505, 0x23, 0xC3);
+ dptx_write(it6505, 0x23, 0xC2);
+ } else {
+ /* The DP AUX transmit buffer has 4 bytes. */
+ size = min_t(size_t, size, 4);
+ dptx_write(it6505, 0x23, 0x42);
+ }
+
+ /* Start Address[7:0] */
+ dptx_write(it6505, 0x24, (address >> 0) & 0xFF);
+ /* Start Address[15:8] */
+ dptx_write(it6505, 0x25, (address >> 8) & 0xFF);
+ /* WriteNum[3:0]+StartAdr[19:16] */
+ dptx_write(it6505, 0x26, ((address >> 16) & 0x0F) | ((size - 1) << 4));
+
+ if (cmd == CMD_AUX_NATIVE_WRITE)
+ regmap_bulk_write(it6505->regmap, 0x27, buffer, size);
+
+ /* Aux Fire */
+ dptx_write(it6505, 0x2B, cmd);
+
+ status = dptx_aux_wait(it6505);
+ if (status < 0)
+ return status;
+
+ status = dptx_read(it6505, 0x9F);
+ if (status < 0)
+ return status;
+
+ switch ((status >> 6) & 0x3) {
+ case 0:
+ *reply = REPLY_ACK;
+ break;
+ case 1:
+ *reply = REPLY_DEFER;
+ return 0;
+ case 2:
+ *reply = REPLY_NACK;
+ return 0;
+ case 3:
+ return -ETIMEDOUT;
+ }
+
+ if (cmd == CMD_AUX_NATIVE_WRITE)
+ goto out;
+
+ if (cmd == CMD_AUX_I2C_EDID_READ) {
+ for (i = 0; i < size; i++) {
+ status = dptx_read(it6505, 0x2F);
+ if (status < 0)
+ return status;
+ buffer[i] = status;
+ }
+ } else {
+ for (i = 0; i < size; i++) {
+ status = dptx_read(it6505, 0x2C + i);
+ if (status < 0)
+ return status;
+ buffer[size - 1 - i] = status;
+ }
+ }
+
+out:
+ dptx_write(it6505, 0x23, 0x41);
+ dptx_write(it6505, 0x23, 0x40);
+ return size;
+}
+
+static ssize_t it6505_aux_transfer(struct drm_dp_aux *aux,
+ struct drm_dp_aux_msg *msg)
+{
+ struct it6505 *it6505 = container_of(aux, struct it6505, aux);
+ u8 cmd;
+ bool is_i2c = !(msg->request & DP_AUX_NATIVE_WRITE);
+ int ret;
+ enum aux_cmd_reply reply;
+
+ /* IT6505 doesn't support arbitrary I2C read / write. */
+ if (is_i2c)
+ return -EINVAL;
+
+ switch (msg->request) {
+ case DP_AUX_NATIVE_READ:
+ cmd = CMD_AUX_NATIVE_READ;
+ break;
+ case DP_AUX_NATIVE_WRITE:
+ cmd = CMD_AUX_NATIVE_WRITE;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = it6505_aux_do_transfer(it6505, cmd, msg->address, msg->buffer,
+ msg->size, &reply);
+ if (ret < 0)
+ return ret;
+
+ switch (reply) {
+ case REPLY_ACK:
+ msg->reply = DP_AUX_NATIVE_REPLY_ACK;
+ break;
+ case REPLY_NACK:
+ msg->reply = DP_AUX_NATIVE_REPLY_NACK;
+ break;
+ case REPLY_DEFER:
+ msg->reply = DP_AUX_NATIVE_REPLY_DEFER;
+ break;
+ }
+
+ return ret;
+}
+
+static int dptx_get_edidblock(void *data, u8 *buf, unsigned int blockno,
+ size_t len)
+{
+ struct it6505 *it6505 = data;
+ int offset, ret, aux_retry = 100;
+ struct device *dev = &it6505->client->dev;
+ enum aux_cmd_reply reply;
+
+ it6505_aux_reset(it6505);
+ DRM_DEV_DEBUG_DRIVER(dev, "blocknum = %d", blockno);
+
+ for (offset = 0; offset < EDID_LENGTH;) {
+ ret = it6505_aux_do_transfer(it6505, CMD_AUX_I2C_EDID_READ,
+ blockno * EDID_LENGTH + offset,
+ buf + offset, 8, &reply);
+ if (ret < 0)
+ return ret;
+
+ switch (reply) {
+ case REPLY_ACK:
+ DRM_DEV_DEBUG_DRIVER(dev, "[0x%02x]: %8ph", offset,
+ buf + offset);
+ offset += 8;
+ aux_retry = 80;
+ break;
+ case REPLY_NACK:
+ return -EIO;
+ case REPLY_DEFER:
+ msleep(20);
+ if (!(--aux_retry))
+ return -EIO;
+ }
+ }
+
+ return 0;
+}
+
+static void it6505_disable_hdcp(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x38, 0x0B, 0x00);
+ dptx_set_bits(it6505, 0x05, 0x10, 0x10);
+}
+
+
+static int it6505_get_modes(struct drm_connector *connector)
+{
+ struct it6505 *it6505 = connector_to_it6505(connector);
+ int err, num_modes = 0, i;
+ struct device *dev = &it6505->client->dev;
+
+ it6505->train_fail_hpd = 3;
+ DRM_DEV_DEBUG_DRIVER(dev, "sink_count:%d", it6505->dpcd_sink_count);
+
+ if (it6505->edid)
+ return drm_add_edid_modes(connector, it6505->edid);
+ mutex_lock(&it6505->mode_lock);
+
+ for (i = 0; i < 3; i++) {
+ dptx_debug_print(it6505, 0x9F, "aux status");
+ it6505_aux_reset(it6505);
+ it6505_disable_hdcp(it6505);
+ it6505->edid =
+ drm_do_get_edid(&it6505->connector, dptx_get_edidblock, it6505);
+
+ if (it6505->edid)
+ break;
+ dptx_debug_dump(it6505);
+ }
+ if (!it6505->edid) {
+ DRM_DEV_ERROR(dev, "Failed to read EDID");
+ goto unlock;
+ }
+
+ err = drm_connector_update_edid_property(connector, it6505->edid);
+ if (err) {
+ DRM_DEV_ERROR(dev, "Failed to update EDID property: %d", err);
+ goto unlock;
+ }
+
+ num_modes = drm_add_edid_modes(connector, it6505->edid);
+
+unlock:
+ mutex_unlock(&it6505->mode_lock);
+
+ return num_modes;
+}
+
+static const struct drm_connector_helper_funcs it6505_connector_helper_funcs = {
+ .get_modes = it6505_get_modes,
+};
+
+static enum drm_connector_status it6505_detect(struct drm_connector *connector,
+ bool force)
+{
+ struct it6505 *it6505 = connector_to_it6505(connector);
+ enum drm_connector_status status;
+ u8 dpcd600;
+
+ if (!it6505->powered)
+ goto it6505_no_powered;
+
+ it6505_aux_on(it6505);
+ dpcd600 = dpcd_read(it6505, DP_SET_POWER);
+ dpcd_debug_print(it6505, DP_SET_POWER, "detect:");
+
+ if (!dptx_get_sink_hpd(it6505) ||
+ (dpcd600 & DP_SET_POWER_MASK) != DP_SET_POWER_D0) {
+it6505_no_powered:
+ it6505->dpcd_sink_count = 0;
+ }
+
+ if (it6505->dpcd_sink_count) {
+ status = connector_status_connected;
+ } else {
+ status = connector_status_disconnected;
+ if (it6505->powered)
+ it6505_lane_off(it6505);
+ }
+
+ DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "sink_count:%d status:%d",
+ it6505->dpcd_sink_count, status);
+
+ return status;
+}
+
+static const struct drm_connector_funcs it6505_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = it6505_detect,
+ .destroy = drm_connector_cleanup,
+ .reset = drm_atomic_helper_connector_reset,
+ .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+static int it6505_extcon_notifier(struct notifier_block *self,
+ unsigned long event, void *ptr)
+{
+ struct it6505 *it6505 = container_of(self, struct it6505, event_nb);
+
+ schedule_work(&it6505->extcon_wq);
+ return NOTIFY_DONE;
+}
+
+static void it6505_extcon_work(struct work_struct *work)
+{
+ struct it6505 *it6505 = container_of(work, struct it6505, extcon_wq);
+ int state = extcon_get_state(it6505->extcon, EXTCON_DISP_DP);
+ unsigned int pwroffretry = 0;
+ struct device *dev = &it6505->client->dev;
+
+ if (it6505->enable_drv_hold)
+ return;
+ mutex_lock(&it6505->lock);
+ DRM_DEV_DEBUG_DRIVER(dev, "EXTCON_DISP_DP = 0x%02x", state);
+ if (state > 0) {
+ DRM_DEV_DEBUG_DRIVER(dev, "start to power on");
+ msleep(1000);
+ it6505_poweron(it6505);
+ if (!dptx_get_sink_hpd(it6505))
+ it6505_lane_off(it6505);
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "start to power off");
+ while (it6505_poweroff(it6505) && pwroffretry++ < 5) {
+ DRM_DEV_DEBUG_DRIVER(dev, "power off fail %d times",
+ pwroffretry);
+ }
+ drm_helper_hpd_irq_event(it6505->connector.dev);
+ DRM_DEV_DEBUG_DRIVER(dev, "power off it6505 success!");
+ }
+ mutex_unlock(&it6505->lock);
+}
+
+static int it6505_use_notifier_module(struct it6505 *it6505)
+{
+ int ret;
+ struct device *dev = &it6505->client->dev;
+
+ it6505->event_nb.notifier_call = it6505_extcon_notifier;
+ INIT_WORK(&it6505->extcon_wq, it6505_extcon_work);
+ ret = devm_extcon_register_notifier(&it6505->client->dev,
+ it6505->extcon, EXTCON_DISP_DP,
+ &it6505->event_nb);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to register notifier for DP");
+ return ret;
+ }
+ schedule_work(&it6505->extcon_wq);
+
+ return 0;
+}
+
+static void it6505_remove_notifier_module(struct it6505 *it6505)
+{
+ if (it6505->extcon) {
+ devm_extcon_unregister_notifier(&it6505->client->dev,
+ it6505->extcon,
+ EXTCON_DISP_DP,
+ &it6505->event_nb);
+ flush_work(&it6505->extcon_wq);
+ }
+}
+
+static int it6505_bridge_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+ struct device *dev;
+ int err;
+
+ dev = &it6505->client->dev;
+ if (!bridge->encoder) {
+ DRM_DEV_ERROR(dev, "Parent encoder object not found");
+ return -ENODEV;
+ }
+
+ err = drm_connector_init(bridge->dev, &it6505->connector,
+ &it6505_connector_funcs,
+ DRM_MODE_CONNECTOR_DisplayPort);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to initialize connector: %d", err);
+ return err;
+ }
+
+ drm_connector_helper_add(&it6505->connector,
+ &it6505_connector_helper_funcs);
+
+ it6505->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
+ err = drm_connector_attach_encoder(&it6505->connector, bridge->encoder);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to link up connector to encoder: %d",
+ err);
+ goto cleanup_connector;
+ }
+
+ err = drm_connector_register(&it6505->connector);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to register connector: %d", err);
+ goto cleanup_connector;
+ }
+
+ err = it6505_use_notifier_module(it6505);
+ if (err < 0) {
+ drm_connector_unregister(&it6505->connector);
+ goto unregister_connector;
+ }
+
+ return 0;
+
+unregister_connector:
+ drm_connector_unregister(&it6505->connector);
+cleanup_connector:
+ drm_connector_cleanup(&it6505->connector);
+ return err;
+}
+
+static void it6505_bridge_detach(struct drm_bridge *bridge)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+
+ it6505_remove_notifier_module(it6505);
+ drm_connector_unregister(&it6505->connector);
+ drm_connector_cleanup(&it6505->connector);
+}
+
+static enum drm_mode_status
+it6505_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+ struct drm_display_mode *video = &it6505->video_info;
+
+ if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+ return MODE_NO_INTERLACE;
+
+ /* Max 1200p at 5.4 Ghz, one lane */
+ if (mode->clock > MAX_PIXEL_CLK)
+ return MODE_CLOCK_HIGH;
+ video->clock = mode->clock;
+
+ return MODE_OK;
+}
+
+static int it6505_send_video_infoframe(struct it6505 *it6505,
+ struct hdmi_avi_infoframe *frame)
+{
+ u8 buffer[HDMI_INFOFRAME_HEADER_SIZE + HDMI_AVI_INFOFRAME_SIZE];
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ err = hdmi_avi_infoframe_pack(frame, buffer, sizeof(buffer));
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to pack AVI infoframe: %d\n", err);
+ return err;
+ }
+
+ err = dptx_set_bits(it6505, 0xE8, 0x01, 0x00);
+ if (err)
+ return err;
+
+ err = regmap_bulk_write(it6505->regmap, 0xE9,
+ buffer + HDMI_INFOFRAME_HEADER_SIZE,
+ frame->length);
+ if (err)
+ return err;
+
+ err = dptx_set_bits(it6505, 0xE8, 0x01, 0x01);
+ if (err)
+ return err;
+
+ return 0;
+}
+
+static void it6505_bridge_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+ struct hdmi_avi_infoframe frame;
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ mutex_lock(&it6505->mode_lock);
+ err = drm_hdmi_avi_infoframe_from_display_mode(&frame,
+ &it6505->connector,
+ adjusted_mode);
+ if (err) {
+ DRM_DEV_ERROR(dev, "Failed to setup AVI infoframe: %d", err);
+ goto unlock;
+ }
+
+ strlcpy(it6505->video_info.name, adjusted_mode->name,
+ DRM_DISPLAY_MODE_LEN);
+ it6505->video_info.type = adjusted_mode->type;
+ it6505->video_info.flags = adjusted_mode->flags;
+ err = it6505_send_video_infoframe(it6505, &frame);
+ if (err)
+ DRM_DEV_ERROR(dev, "Failed to send AVI infoframe: %d", err);
+
+unlock:
+ mutex_unlock(&it6505->mode_lock);
+}
+
+static bool it6505_audio_input(struct it6505 *it6505)
+{
+ int regbe = dptx_read(it6505, 0xBE);
+
+ return regbe != 0xFF;
+}
+
+static void dptx_set_audio_format(struct it6505 *it6505)
+{
+ unsigned int audio_source_count;
+
+ /* I2S MODE */
+ dptx_write(it6505, 0xB9,
+ (it6505->audio_word_length << 5) | (it6505->i2s_data_sequence << 4) |
+ (it6505->i2s_ws_channel << 3) |
+ (it6505->i2s_data_delay << 2) |
+ (it6505->i2s_justified << 1) | it6505->i2s_input_format);
+ if (it6505->audio_select == SPDIF) {
+ dptx_write(it6505, 0xBA, 0x00);
+ /* 0x30 = 128*FS */
+ dptx_set_bits(it6505, 0x11, 0xF0, 0x30);
+ } else {
+ dptx_write(it6505, 0xBA, 0xE4);
+ }
+
+ dptx_write(it6505, 0xBB, 0x20);
+ dptx_write(it6505, 0xBC, 0x00);
+ audio_source_count = BIT(DIV_ROUND_UP(it6505->audio_channel_count, 2))
+ - 1;
+
+
+ audio_source_count |= it6505->audio_select << 4;
+
+ dptx_write(it6505, 0xB8, audio_source_count);
+}
+
+static void dptx_set_audio_channel_status(struct it6505 *it6505)
+{
+ enum it6505_audio_sample_rate sample_rate = it6505->audio_sample_rate;
+ u8 audio_word_length_map[] = {0x02, 0x04, 0x03, 0x0B};
+
+ /* Channel Status */
+ dptx_write(it6505, 0xBF, it6505->audio_type << 1);
+ dptx_write(it6505, 0xC0, 0x00);
+ dptx_write(it6505, 0xC1, 0x00);
+ dptx_write(it6505, 0xC2, sample_rate);
+ dptx_write(it6505, 0xC3, (~sample_rate << 4) |
+ audio_word_length_map[it6505->audio_word_length]);
+}
+
+static void dptx_set_audio_infoframe(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+ u8 audio_info_ca[] = {0x00, 0x00, 0x01, 0x03, 0x07, 0x0B, 0x0F, 0x1F};
+
+ dptx_write(it6505, 0xF7, it6505->audio_channel_count - 1);
+ dptx_set_bits(it6505, 0xF8, 0x03, 0x00);
+
+ if (it6505->audio_channel_count > 0 && it6505->audio_channel_count <= 8)
+ dptx_write(it6505, 0xF9,
+ audio_info_ca[it6505->audio_channel_count - 1]);
+ else
+ DRM_DEV_ERROR(dev, "audio channel number error: %u",
+ it6505->audio_channel_count);
+ /* Enable Audio InfoFrame */
+ dptx_set_bits(it6505, 0xE8, 0x22, 0x22);
+}
+
+static void it6505_set_audio(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+ int regbe;
+
+ it6505_audio_disable(it6505);
+ /* Audio Clock Domain Reset */
+ dptx_set_bits(it6505, 0x05, 0x02, 0x02);
+ /* Audio mute */
+ dptx_set_bits(it6505, 0xD3, 0x20, 0x20);
+ /* Release Audio Clock Domain Reset */
+ dptx_set_bits(it6505, 0x05, 0x02, 0x00);
+
+ if (it6505_audio_input(it6505)) {
+ regbe = dptx_read(it6505, 0xBE);
+ DRM_DEV_DEBUG_DRIVER(dev, "audio input fs: %d.%d kHz",
+ 6750 / regbe, 67500 % regbe);
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "no audio input");
+ }
+
+ dptx_set_audio_channel_status(it6505);
+ dptx_set_audio_format(it6505);
+ dptx_set_audio_infoframe(it6505);
+
+ /* Enable Enhanced Audio TimeStmp Mode */
+ dptx_set_bits(it6505, 0xD4, 0x04, 0x04);
+ /* Disable Full Audio Packet */
+ dptx_set_bits(it6505, 0xBB, 0x10, 0x00);
+
+ dptx_write(it6505, 0xDE, 0x00);
+ dptx_write(it6505, 0xDF, 0x80);
+ dptx_write(it6505, 0xE0, 0x00);
+ dptx_set_bits(it6505, 0xB8, 0x80, 0x80);
+ dptx_set_bits(it6505, 0xB8, 0x80, 0x00);
+ dptx_set_bits(it6505, 0xD3, 0x20, 0x00);
+ it6505->enable_audio = true;
+}
+
+static int __maybe_unused it6505_audio_set_hw_params(struct it6505 *it6505,
+ struct hdmi_codec_params *params)
+{
+ unsigned int channel_count = params->cea.channels, i = 0;
+ struct device *dev = &it6505->client->dev;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "setting %d Hz, %d bit, %d channels\n",
+ params->sample_rate, params->sample_width,
+ channel_count);
+
+ if (!it6505->bridge.encoder)
+ return -ENODEV;
+
+ while (audio_sample_rate_map[i].sample_rate_value &&
+ params->sample_rate !=
+ audio_sample_rate_map[i].sample_rate_value) {
+ i++;
+ }
+ if (!audio_sample_rate_map[i].sample_rate_value) {
+ DRM_DEV_DEBUG_DRIVER(dev, "sample rate: %d Hz not support",
+ params->sample_rate);
+ return -EINVAL;
+ }
+ it6505->audio_sample_rate = audio_sample_rate_map[i].rate;
+
+ switch (params->sample_width) {
+ case 16:
+ it6505->audio_word_length = WORD_LENGTH_16BIT;
+ break;
+ case 18:
+ it6505->audio_word_length = WORD_LENGTH_18BIT;
+ break;
+ case 20:
+ it6505->audio_word_length = WORD_LENGTH_20BIT;
+ break;
+ case 24:
+ case 32:
+ it6505->audio_word_length = WORD_LENGTH_24BIT;
+ break;
+ default:
+ DRM_DEV_DEBUG_DRIVER(dev, "wordlength: %d bit not support",
+ params->sample_width);
+ return -EINVAL;
+ }
+
+ if (channel_count == 0 || channel_count % 2) {
+ DRM_DEV_DEBUG_DRIVER(dev, "channel number: %d not support",
+ channel_count);
+ return -EINVAL;
+ }
+ it6505->audio_channel_count = channel_count;
+
+ return 0;
+}
+
+/*
+ * DPCD Read
+ */
+
+static int it6505_get_dpcd(struct it6505 *it6505, int offset, u8 *dpcd, int num)
+{
+ int i, ret;
+ struct device *dev = &it6505->client->dev;
+
+ for (i = 0; i < num; i += 4) {
+ ret = drm_dp_dpcd_read(&it6505->aux, offset + i, dpcd + i,
+ min(num - i, 4));
+ if (ret < 0)
+ return ret;
+ }
+
+ DRM_DEV_DEBUG_DRIVER(dev, "DPCD[0x%x] = %*ph", offset, num, dpcd);
+ return 0;
+}
+
+static void it6505_parse_dpcd(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+ int bcaps;
+ struct it6505_drm_dp_link *link = &it6505->link;
+
+ it6505_get_dpcd(it6505, DP_DPCD_REV, it6505->dpcd,
+ ARRAY_SIZE(it6505->dpcd));
+
+ DRM_DEV_DEBUG_DRIVER(dev, "#########DPCD Rev.: %d.%d###########",
+ link->revision >> 4, link->revision & 0x0F);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "Sink maximum link rate: %d.%d Gbps per lane",
+ link->rate / 100000, link->rate / 1000 % 100);
+
+ switch (link->rate) {
+ case 162000:
+ it6505->hbr =
+ min3(MAX_LINK_RATE, TRAINING_LINK_RATE, RBR) ? true : false;
+ if (it6505->hbr)
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Not support HBR Mode, will train RBR");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "Training RBR");
+ break;
+
+ case 270000:
+ it6505->hbr =
+ min3(MAX_LINK_RATE, TRAINING_LINK_RATE, HBR) ? true : false;
+ if (!it6505->hbr)
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Support HBR mode, will train RBR");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "Training HBR");
+ break;
+
+ case 540000:
+ it6505->hbr =
+ min3(MAX_LINK_RATE, TRAINING_LINK_RATE, HBR2) ? true : false;
+ if (it6505->hbr)
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Support HBR2 mode, will train HBR");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "Training RBR");
+ break;
+
+ case 810000:
+ it6505->hbr =
+ min3(MAX_LINK_RATE, TRAINING_LINK_RATE, HBR3) ? true : false;
+ if (it6505->hbr)
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Support HBR3 mode, will train HBR");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "Training RBR");
+ break;
+ default:
+ DRM_DEV_ERROR(dev, "Unknown Maximum Link Rate: %u",
+ link->rate);
+ break;
+ }
+
+ if (link->num_lanes == 1 || link->num_lanes == 2 ||
+ link->num_lanes == 4) {
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Lane Count: %u lane", link->num_lanes);
+ it6505->lane_count = min3(MAX_LANE_COUNT, TRAINING_LANE_COUNT,
+ (int)link->num_lanes);
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "Training %u lane", it6505->lane_count);
+ } else {
+ DRM_DEV_ERROR(dev, "Lane Count Error: %u", link->num_lanes);
+ }
+
+ if (link->capabilities)
+ DRM_DEV_DEBUG_DRIVER(dev, "Support Enhanced Framing");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "Can not support Enhanced Framing Mode");
+
+ if (it6505->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "Maximum Down-Spread: 0.5, support SSC!");
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "Maximum Down-Spread: 0, No support SSC!");
+ it6505->enable_ssc = false;
+ }
+
+ if (link->revision >= 0x11 &&
+ it6505->dpcd[DP_MAX_DOWNSPREAD] & DP_NO_AUX_HANDSHAKE_LINK_TRAINING)
+ DRM_DEV_DEBUG_DRIVER(dev, "Support No AUX Training");
+ else
+ DRM_DEV_DEBUG_DRIVER(dev, "Can not support No AUX Training");
+
+ bcaps = dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
+ if (bcaps & DP_BCAPS_HDCP_CAPABLE) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Sink support HDCP!");
+ it6505->cp_capable = true;
+ DRM_DEV_DEBUG_DRIVER(dev, "Downstream is %s!",
+ bcaps & DP_BCAPS_REPEATER_PRESENT ? "repeater" : "receiver");
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "Sink not support HDCP!");
+ it6505->cp_capable = false;
+ it6505->enable_hdcp = false;
+ }
+}
+
+static void it6505_enable_hdcp(struct it6505 *it6505)
+{
+ u8 bksvs[5], c;
+ struct device *dev = &it6505->client->dev;
+
+ /* Disable CP_Desired */
+ dptx_set_bits(it6505, 0x38, 0x0B, 0x00);
+ dptx_set_bits(it6505, 0x05, 0x10, 0x10);
+
+ usleep_range(1000, 1500);
+ c = dpcd_read(it6505, DP_AUX_HDCP_BCAPS);
+ DRM_DEV_DEBUG_DRIVER(dev, "DPCD[0x68028]: 0x%x\n", c);
+ if (!c)
+ return;
+
+ dptx_set_bits(it6505, 0x05, 0x10, 0x00);
+ /* Disable CP_Desired */
+ dptx_set_bits(it6505, 0x38, 0x01, 0x00);
+ /* Use R0' 100ms waiting */
+ dptx_set_bits(it6505, 0x38, 0x08, 0x00);
+ /* clear the repeater List Chk Done and fail bit */
+ dptx_set_bits(it6505, 0x39, 0x30, 0x00);
+
+ it6505_get_dpcd(it6505, DP_AUX_HDCP_BKSV, bksvs, ARRAY_SIZE(bksvs));
+
+ DRM_DEV_DEBUG_DRIVER(dev, "Sink BKSV = %5ph", bksvs);
+
+ /* Select An Generator */
+ dptx_set_bits(it6505, 0x3A, 0x01, 0x01);
+ /* Enable An Generator */
+ dptx_set_bits(it6505, 0x3A, 0x02, 0x02);
+ /* delay1ms(10);*/
+ usleep_range(10000, 15000);
+ /* Stop An Generator */
+ dptx_set_bits(it6505, 0x3A, 0x02, 0x00);
+
+ dptx_set_bits(it6505, 0x38, 0x01, 0x01);
+ dptx_set_bits(it6505, 0x39, 0x01, 0x01);
+}
+
+static void it6505_lanespeed_setup(struct it6505 *it6505)
+{
+ if (!it6505->hbr) {
+ dptx_set_bits(it6505, 0x16, 0x01, 0x01);
+ dptx_set_bits(it6505, 0x5C, 0x02, 0x00);
+ } else {
+ dptx_set_bits(it6505, 0x16, 0x01, 0x00);
+ dptx_set_bits(it6505, 0x5C, 0x02, 0x02);
+ }
+}
+
+static void it6505_lane_swap(struct it6505 *it6505)
+{
+ int err;
+ union extcon_property_value property;
+ struct device *dev = &it6505->client->dev;
+
+ if (!it6505->lane_swap_disabled) {
+ err = extcon_get_property(it6505->extcon, EXTCON_DISP_DP,
+ EXTCON_PROP_USB_TYPEC_POLARITY,
+ &property);
+ if (err) {
+ DRM_DEV_ERROR(dev, "get property fail!");
+ return;
+ }
+ it6505->lane_swap = property.intval;
+ }
+
+ dptx_set_bits(it6505, 0x16, 0x08, it6505->lane_swap ? 0x08 : 0x00);
+ dptx_set_bits(it6505, 0x16, 0x06, (it6505->lane_count - 1) << 1);
+ DRM_DEV_DEBUG_DRIVER(dev, "it6505 lane_swap = 0x%x", it6505->lane_swap);
+ it6505_lane_power_on(it6505);
+ it6505_lane_termination_on(it6505);
+}
+
+static void it6505_lane_config(struct it6505 *it6505)
+{
+ it6505_lanespeed_setup(it6505);
+ it6505_lane_swap(it6505);
+}
+
+static void it6505_set_ssc(struct it6505 *it6505)
+{
+ dptx_set_bits(it6505, 0x16, 0x10, it6505->enable_ssc << 4);
+ if (it6505->enable_ssc) {
+ dptx_select_bank(it6505, 1);
+ dptx_write(it6505, 0x88, 0x9E);
+ dptx_write(it6505, 0x89, 0x1C);
+ dptx_write(it6505, 0x8A, 0x42);
+ dptx_select_bank(it6505, 0);
+ dptx_write(it6505, 0x58, 0x07);
+ dptx_write(it6505, 0x59, 0x29);
+ dptx_write(it6505, 0x5A, 0x03);
+ /* Stamp Interrupt Step */
+ dptx_set_bits(it6505, 0xD4, 0x30, 0x10);
+ dpcd_write(it6505, DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5);
+ } else {
+ dpcd_write(it6505, DP_DOWNSPREAD_CTRL, 0x00);
+ dptx_set_bits(it6505, 0xD4, 0x30, 0x00);
+ }
+}
+
+static void it6505_pixel_clk_phase_adjustment(struct it6505 *it6505)
+{
+ struct drm_display_mode *vid = &it6505->video_info;
+
+ dptx_set_bits(it6505, 0x10, 0x03,
+ vid->clock < ADJUST_PHASE_THRESHOLD ? PIXEL_CLK_DELAY : 0);
+ dptx_set_bits(it6505, 0x12, 0x10, PIXEL_CLK_INVERSE << 4);
+}
+
+static void it6505_set_afe_driving(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+ u32 afe_setting;
+
+ if (device_property_read_u32(dev, "afe-setting", &afe_setting) < 0)
+ afe_setting = 0;
+ if (afe_setting >= ARRAY_SIZE(afe_setting_table)) {
+ DRM_DEV_ERROR(dev, "afe setting value error and use default");
+ afe_setting = 0;
+ }
+ if (afe_setting) {
+ dptx_select_bank(it6505, 1);
+ dptx_write(it6505, 0x7E, afe_setting_table[afe_setting][0]);
+ dptx_write(it6505, 0x7F, afe_setting_table[afe_setting][1]);
+ dptx_write(it6505, 0x81, afe_setting_table[afe_setting][2]);
+ dptx_select_bank(it6505, 0);
+ }
+}
+
+static void dptx_output_config(struct it6505 *it6505)
+{
+ /* change bank 0 */
+ dptx_select_bank(it6505, 0);
+ /* config CSC mapping table into RGB-to-YCbCr */
+ dptx_write(it6505, 0x64, 0x10);
+ dptx_write(it6505, 0x65, 0x80);
+ dptx_write(it6505, 0x66, 0x10);
+ dptx_write(it6505, 0x67, 0x4F);
+ dptx_write(it6505, 0x68, 0x09);
+ dptx_write(it6505, 0x69, 0xBA);
+ dptx_write(it6505, 0x6A, 0x3B);
+ dptx_write(it6505, 0x6B, 0x4B);
+ dptx_write(it6505, 0x6C, 0x3E);
+ dptx_write(it6505, 0x6D, 0x4F);
+ dptx_write(it6505, 0x6E, 0x09);
+ dptx_write(it6505, 0x6F, 0x56);
+ dptx_write(it6505, 0x70, 0x0E);
+ dptx_write(it6505, 0x71, 0x00);
+ dptx_write(it6505, 0x72, 0x00);
+ dptx_write(it6505, 0x73, 0x4F);
+ dptx_write(it6505, 0x74, 0x09);
+ dptx_write(it6505, 0x75, 0x00);
+ dptx_write(it6505, 0x76, 0x00);
+ dptx_write(it6505, 0x77, 0xE7);
+ dptx_write(it6505, 0x78, 0x10);
+ /* initial HPD Timer event setting */
+ dptx_write(it6505, 0xE8, 0x00);
+ dptx_set_bits(it6505, 0xCE, 0x70, 0x60);
+ dptx_write(it6505, 0xCA, 0x4D);
+ dptx_write(it6505, 0xC9, 0xF5);
+ dptx_write(it6505, 0x5C, 0x02);
+
+ it6505_drm_dp_link_power_up(&it6505->aux, &it6505->link);
+ dptx_set_bits(it6505, 0x59, 0x01, 0x01);
+ dptx_set_bits(it6505, 0x5A, 0x05, 0x01);
+ dptx_write(it6505, 0x12, 0x01);
+ dptx_write(it6505, 0xCB, 0x17);
+ dptx_write(it6505, 0x11, 0x09);
+ dptx_write(it6505, 0x20, 0x28);
+ dptx_set_bits(it6505, 0x23, 0x30, 0x00);
+ dptx_set_bits(it6505, 0x3A, 0x04, 0x04);
+ dptx_set_bits(it6505, 0x15, 0x01, 0x01);
+ dptx_write(it6505, 0x0C, 0x08);
+
+ dptx_set_bits(it6505, 0x5F, 0x20, 0x00);
+ it6505_lane_config(it6505);
+
+ it6505_set_ssc(it6505);
+
+ if (it6505->link.capabilities) {
+ dptx_write(it6505, 0xD3, 0x33);
+ dpcd_write(it6505, DP_LANE_COUNT_SET,
+ it6505->lane_count | DP_LANE_COUNT_ENHANCED_FRAME_EN);
+ } else {
+ dptx_write(it6505, 0xD3, 0x32);
+ }
+
+ /* it6505 displayport phy and logic reset */
+ dptx_set_bits(it6505, 0x15, 0x02, 0x02);
+ dptx_set_bits(it6505, 0x15, 0x02, 0x00);
+ dptx_set_bits(it6505, 0x05, 0x03, 0x00);
+
+ /* reg60[2] = Input DDR */
+ dptx_write(it6505, 0x60, 0x44);
+ /* M444B24 format */
+ dptx_write(it6505, 0x62, 0x01);
+ /* select RGB Bypass CSC */
+ dptx_write(it6505, 0x63, 0x00);
+
+ it6505_pixel_clk_phase_adjustment(it6505);
+ dptx_set_bits(it6505, 0x61, 0x01, 0x01);
+ dptx_write(it6505, 0x06, 0xFF);
+ dptx_write(it6505, 0x07, 0xFF);
+ dptx_write(it6505, 0x08, 0xFF);
+
+ dptx_set_bits(it6505, 0xD3, 0x10, 0x00);
+ dptx_set_bits(it6505, 0xD4, 0x41, 0x41);
+ dptx_set_bits(it6505, 0xE8, 0x11, 0x11);
+
+ it6505_set_afe_driving(it6505);
+}
+
+static void it6505_start_auto_train(struct it6505 *it6505)
+{
+ /* reset auto DP link training */
+ dptx_write(it6505, 0x17, 0x04);
+ /* start auto DP link training */
+ dptx_write(it6505, 0x17, 0x01);
+}
+
+static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
+{
+ return link_status[r - DP_LANE0_1_STATUS];
+}
+
+static bool it6505_use_step_train_check(struct it6505 *it6505)
+{
+ if (it6505->link.revision >= 0x12)
+ return it6505->dpcd[DP_TRAINING_AUX_RD_INTERVAL] >= 0x01;
+
+ return true;
+}
+
+static bool it6505_check_max_value(u8 lane_voltage_swing_pre_emphasis)
+{
+ return ((lane_voltage_swing_pre_emphasis & 0x03) == 0x03);
+}
+
+static bool it6505_check_max_voltage_swing_reached(u8 *lane_voltage_swing,
+ u8 lane_count)
+{
+ u8 i;
+
+ for (i = 0; i < lane_count; i++) {
+ if (lane_voltage_swing[i] & DP_TRAIN_MAX_SWING_REACHED)
+ return true;
+ }
+
+ return false;
+}
+
+static bool it6505_step_train_lane_voltage_pre_emphasis_set(
+ struct it6505 *it6505,
+ struct it6505_lane_voltage_pre_emphasis *lane_voltage_pre_emphasis,
+ u8 *lane_voltage_pre_emphasis_set)
+{
+ u8 i;
+
+ for (i = 0; i < it6505->lane_count; i++) {
+ lane_voltage_pre_emphasis->voltage_swing[i] &= 0x03;
+ lane_voltage_pre_emphasis_set[i] =
+ lane_voltage_pre_emphasis->voltage_swing[i];
+ if (it6505_check_max_value(
+ lane_voltage_pre_emphasis->voltage_swing[i]))
+ lane_voltage_pre_emphasis_set[i] |=
+ DP_TRAIN_MAX_SWING_REACHED;
+
+ lane_voltage_pre_emphasis->pre_emphasis[i] &= 0x03;
+ lane_voltage_pre_emphasis_set[i] |=
+ lane_voltage_pre_emphasis->pre_emphasis[i]
+ << DP_TRAIN_PRE_EMPHASIS_SHIFT;
+ if (it6505_check_max_value(
+ lane_voltage_pre_emphasis->pre_emphasis[i]))
+ lane_voltage_pre_emphasis_set[i] |=
+ DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
+ dpcd_write(it6505, DP_TRAINING_LANE0_SET + i,
+ lane_voltage_pre_emphasis_set[i]);
+
+ if (lane_voltage_pre_emphasis_set[i] !=
+ dpcd_read(it6505, DP_TRAINING_LANE0_SET + i))
+ return false;
+ }
+
+ return true;
+}
+
+static bool it6505_step_cr_train(
+ struct it6505 *it6505,
+ struct it6505_lane_voltage_pre_emphasis *lane_voltage_pre_emphasis)
+{
+ u8 loop_count = 0, i = 0, j, voltage_swing_adjust = -1;
+ u8 link_status[DP_LINK_STATUS_SIZE] = { 0 }, pre_emphasis_adjust = -1;
+ u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
+
+ it6505_drm_dp_link_configure(it6505);
+ dpcd_write(it6505, DP_DOWNSPREAD_CTRL,
+ it6505->enable_ssc ? DP_SPREAD_AMP_0_5 : 0 << 4);
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_1);
+
+ while (loop_count < 5 && i < 10) {
+ i++;
+ if (!it6505_step_train_lane_voltage_pre_emphasis_set(
+ it6505, lane_voltage_pre_emphasis,
+ lane_level_config))
+ continue;
+ drm_dp_link_train_clock_recovery_delay(it6505->dpcd);
+ it6505_get_dpcd(it6505, DP_LANE0_1_STATUS, link_status,
+ ARRAY_SIZE(link_status));
+
+ if (drm_dp_clock_recovery_ok(link_status, it6505->lane_count)) {
+ dptx_set_bits(it6505, 0x16, BIT(5), BIT(5));
+ return true;
+ }
+ DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "cr not done");
+
+ if (it6505_check_max_voltage_swing_reached(lane_level_config,
+ it6505->lane_count))
+ goto cr_train_fail;
+
+ for (j = 0; j < it6505->lane_count; j++) {
+ lane_voltage_pre_emphasis->voltage_swing[j] =
+ drm_dp_get_adjust_request_voltage(link_status,
+ j) >>
+ DP_TRAIN_VOLTAGE_SWING_SHIFT;
+ lane_voltage_pre_emphasis->pre_emphasis[j] =
+ drm_dp_get_adjust_request_pre_emphasis(
+ link_status, j) >>
+ DP_TRAIN_PRE_EMPHASIS_SHIFT;
+ if ((voltage_swing_adjust ==
+ lane_voltage_pre_emphasis->voltage_swing[j]) &&
+ (pre_emphasis_adjust ==
+ lane_voltage_pre_emphasis->pre_emphasis[j])) {
+ loop_count++;
+ continue;
+ }
+
+ voltage_swing_adjust =
+ lane_voltage_pre_emphasis->voltage_swing[j];
+ pre_emphasis_adjust =
+ lane_voltage_pre_emphasis->pre_emphasis[j];
+ loop_count = 0;
+
+ if (voltage_swing_adjust + pre_emphasis_adjust > 0x03)
+ lane_voltage_pre_emphasis->voltage_swing[j] =
+ 0x03 - lane_voltage_pre_emphasis
+ ->pre_emphasis[j];
+ }
+ }
+
+cr_train_fail:
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+
+ return false;
+}
+
+static bool it6505_step_eq_train(
+ struct it6505 *it6505,
+ struct it6505_lane_voltage_pre_emphasis *lane_voltage_pre_emphasis)
+{
+ u8 loop_count = 0, i, link_status[DP_LINK_STATUS_SIZE] = { 0 };
+ u8 lane_level_config[MAX_LANE_COUNT] = { 0 };
+
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_2);
+
+ while (loop_count < 6) {
+ loop_count++;
+
+ if (!it6505_step_train_lane_voltage_pre_emphasis_set(
+ it6505, lane_voltage_pre_emphasis,
+ lane_level_config))
+ continue;
+
+ drm_dp_link_train_channel_eq_delay(it6505->dpcd);
+ it6505_get_dpcd(it6505, DP_LANE0_1_STATUS, link_status,
+ ARRAY_SIZE(link_status));
+
+ if (!drm_dp_clock_recovery_ok(link_status, it6505->lane_count))
+ goto eq_train_fail;
+
+ if (drm_dp_channel_eq_ok(link_status, it6505->lane_count)) {
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+ dptx_set_bits(it6505, 0x16, BIT(6), BIT(6));
+ return true;
+ }
+ DRM_DEV_DEBUG_DRIVER(&it6505->client->dev, "eq not done");
+
+ for (i = 0; i < it6505->lane_count; i++) {
+ lane_voltage_pre_emphasis->voltage_swing[i] =
+ drm_dp_get_adjust_request_voltage(link_status,
+ i) >>
+ DP_TRAIN_VOLTAGE_SWING_SHIFT;
+ lane_voltage_pre_emphasis->pre_emphasis[i] =
+ drm_dp_get_adjust_request_pre_emphasis(
+ link_status, i) >>
+ DP_TRAIN_PRE_EMPHASIS_SHIFT;
+
+ if (lane_voltage_pre_emphasis->voltage_swing[i] +
+ lane_voltage_pre_emphasis->pre_emphasis[i] >
+ 0x03)
+ lane_voltage_pre_emphasis->voltage_swing[i] =
+ 0x03 - lane_voltage_pre_emphasis
+ ->pre_emphasis[i];
+ }
+ }
+
+eq_train_fail:
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+ return false;
+}
+
+static bool it6505_step_train(struct it6505 *it6505)
+{
+ struct it6505_lane_voltage_pre_emphasis lane_voltage_pre_emphasis = {
+ .voltage_swing = { 0 },
+ .pre_emphasis = { 0 },
+ };
+
+ if (!it6505_step_cr_train(it6505, &lane_voltage_pre_emphasis))
+ return false;
+ if (!it6505_step_eq_train(it6505, &lane_voltage_pre_emphasis))
+ return false;
+ return true;
+}
+
+static void dptx_process_sys_wait(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+
+ dptx_debug_print(it6505, 0x9F, "");
+
+ if (it6505->train_pass) {
+ DRM_DEV_DEBUG_DRIVER(dev, "%s Training Success",
+ it6505->enable_auto_train ? "Auto" :
+ "Step");
+ if (it6505->enable_auto_train)
+ dptx_debug_print(it6505, 0x0E, "Auto training state:");
+
+ if (it6505_audio_input(it6505)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Enable audio!");
+ it6505_set_audio(it6505);
+ }
+ it6505->enable_auto_train = true;
+
+ if (it6505->hdcp_flag) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Enable HDCP");
+ dptx_sys_chg(it6505, SYS_HDCP);
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "Disable HDCP");
+ dptx_sys_chg(it6505, SYS_NOROP);
+ }
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "%s Training fail step %d",
+ it6505->enable_auto_train ? "Auto" :
+ "Step",
+ it6505->train_count);
+ dptx_debug_print(it6505, 0x0D, "system state");
+ if (it6505->train_count > 0) {
+ it6505->train_count--;
+ dptx_sys_chg(it6505, SYS_TRAIN);
+ } else {
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "%s Training Fail 3 times",
+ it6505->enable_auto_train ? "Auto" : "Step");
+ DRM_DEV_DEBUG_DRIVER(dev, "Sys change to SYS_HPD");
+ if (it6505->train_fail_hpd > 0) {
+ if (it6505_use_step_train_check(it6505))
+ it6505->enable_auto_train = false;
+ it6505->train_fail_hpd--;
+ dptx_sys_chg(it6505, SYS_HPD);
+ } else {
+ dptx_sys_chg(it6505, SYS_TRAINFAIL);
+ }
+ }
+ }
+}
+
+static void dptx_sys_fsm(struct it6505 *it6505)
+{
+ unsigned int i;
+ int reg0e;
+ struct device *dev = &it6505->client->dev;
+
+ if (it6505->state != SYS_UNPLUG && !dptx_get_sink_hpd(it6505))
+ dptx_sys_chg(it6505, SYS_UNPLUG);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "state: %s", state_string[it6505->state]);
+ switch (it6505->state) {
+ case SYS_UNPLUG:
+ drm_helper_hpd_irq_event(it6505->connector.dev);
+ break;
+
+ case SYS_HPD:
+ dptx_debug_print(it6505, 0x9F, "aux status");
+ it6505_drm_dp_link_probe(&it6505->aux, &it6505->link);
+ it6505_drm_dp_link_power_up(&it6505->aux, &it6505->link);
+ dpcd_debug_print(it6505, DP_SET_POWER, "");
+ it6505->dpcd_sink_count
+ = dpcd_read(it6505, DP_SINK_COUNT);
+ it6505->dpcd_sink_count &= 0x3F;
+ DRM_DEV_DEBUG_DRIVER(dev, "sink_count:%d",
+ it6505->dpcd_sink_count);
+ drm_helper_hpd_irq_event(it6505->connector.dev);
+
+ if (it6505->dpcd_sink_count) {
+ for (i = 0; i < 4000; i++) {
+ usleep_range(1000, 2000);
+ if (it6505->edid)
+ break;
+ }
+ }
+
+ it6505_init_variable(it6505);
+ /* GETDPCD */
+ it6505_parse_dpcd(it6505);
+
+ /*
+ * training fail 3 times,
+ * then change to HPD to restart
+ */
+ it6505->train_count = 3;
+ DRM_DEV_DEBUG_DRIVER(dev, "will Train %s, %d lanes",
+ it6505->hbr ? "HBR" : "RBR",
+ it6505->lane_count);
+ it6505_disable_hdcp(it6505);
+ it6505_audio_disable(it6505);
+ dptx_output_config(it6505);
+ dptx_sys_chg(it6505, SYS_TRAIN);
+ break;
+
+ case SYS_TRAIN:
+ if (it6505->enable_auto_train) {
+ it6505_start_auto_train(it6505);
+ /*
+ * waiting for training down flag
+ * because we don't know
+ * how long this step will be completed
+ * so use step 1ms to wait
+ */
+ for (i = 0; i < 200; i++) {
+ usleep_range(1000, 2000);
+ reg0e = dptx_read(it6505, 0x0E);
+ if (reg0e & BIT(4)) {
+ it6505->train_pass = true;
+ break;
+ }
+ }
+ } else {
+ dptx_set_bits(it6505, 0x16, 0x60, 0x00);
+ dpcd_write(it6505, DP_TRAINING_PATTERN_SET,
+ DP_TRAINING_PATTERN_DISABLE);
+ if (it6505_step_train(it6505))
+ it6505->train_pass = true;
+ }
+
+ dptx_sys_chg(it6505, SYS_WAIT);
+ break;
+
+ case SYS_WAIT:
+ dptx_process_sys_wait(it6505);
+ break;
+
+ case SYS_HDCP:
+ msleep(2400);
+ it6505_enable_hdcp(it6505);
+ break;
+
+ case SYS_NOROP:
+ break;
+
+ case SYS_TRAINFAIL:
+ break;
+
+ default:
+ DRM_DEV_ERROR(dev, "sys_state change to unknown_state: %d",
+ it6505->state);
+ break;
+ }
+}
+
+static int sha1_digest(struct it6505 *it6505, u8 *sha1_input, unsigned int size,
+ u8 *output_av)
+{
+ struct shash_desc *desc;
+ struct crypto_shash *tfm;
+ int err;
+ struct device *dev = &it6505->client->dev;
+
+ tfm = crypto_alloc_shash("sha1", 0, 0);
+ if (IS_ERR(tfm)) {
+ DRM_DEV_ERROR(dev, "crypto_alloc_shash sha1 failed");
+ return PTR_ERR(tfm);
+ }
+ desc = kzalloc(sizeof(*desc) + crypto_shash_descsize(tfm), GFP_KERNEL);
+ if (!desc) {
+ crypto_free_shash(tfm);
+ return -ENOMEM;
+ }
+
+ desc->tfm = tfm;
+ err = crypto_shash_digest(desc, sha1_input, size, output_av);
+ if (err)
+ DRM_DEV_ERROR(dev, "crypto_shash_digest sha1 failed");
+
+ crypto_free_shash(tfm);
+ kfree(desc);
+ return err;
+}
+
+static int it6505_makeup_sha1_input(struct it6505 *it6505)
+{
+ int msgcnt = 0, i;
+ u8 am0[8], binfo[2];
+ struct device *dev = &it6505->client->dev;
+
+ dptx_set_bits(it6505, 0x3A, 0x20, 0x20);
+ for (i = 0; i < 8; i++)
+ am0[i] = dptx_read(it6505, 0x4C + i);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "read am0 = %8ph", am0);
+ dptx_set_bits(it6505, 0x3A, 0x20, 0x00);
+
+ it6505_get_dpcd(it6505, DP_AUX_HDCP_BINFO, binfo, ARRAY_SIZE(binfo));
+ DRM_DEV_DEBUG_DRIVER(dev, "Attached devices: %02x", binfo[0] & 0x7F);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "%s 127 devices are attached",
+ (binfo[0] & BIT(7)) ? "over" : "under");
+ DRM_DEV_DEBUG_DRIVER(dev, "depth, attached levels: %02x",
+ binfo[1] & 0x07);
+ DRM_DEV_DEBUG_DRIVER(dev, "%s than seven levels cascaded",
+ (binfo[1] & BIT(3)) ? "more" : "less");
+
+ for (i = 0; i < (binfo[0] & 0x7F); i++) {
+ it6505_get_dpcd(it6505, DP_AUX_HDCP_KSV_FIFO + (i % 3) * 5,
+ it6505->sha1_input + msgcnt, 5);
+ msgcnt += 5;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "KSV List %d device : %5ph", i,
+ it6505->sha1_input + i * 5);
+ }
+ it6505->sha1_input[msgcnt++] = binfo[0];
+ it6505->sha1_input[msgcnt++] = binfo[1];
+ for (i = 0; i < 8; i++)
+ it6505->sha1_input[msgcnt++] = am0[i];
+
+ DRM_DEV_DEBUG_DRIVER(dev, "SHA Message Count = %d", msgcnt);
+ return msgcnt;
+}
+
+static void it6505_check_sha1_result(struct it6505 *it6505)
+{
+ unsigned int i, sha_pass;
+ struct device *dev = &it6505->client->dev;
+
+ DRM_DEV_DEBUG_DRIVER(dev, "SHA calculate complete");
+ for (i = 0; i < 5; i++)
+ DRM_DEV_DEBUG_DRIVER(dev, "av %d: %4ph", i, it6505->av[i]);
+
+ sha_pass = 1;
+ for (i = 0; i < 5; i++) {
+ it6505_get_dpcd(it6505, DP_AUX_HDCP_V_PRIME(i), it6505->bv[i],
+ 4);
+ DRM_DEV_DEBUG_DRIVER(dev, "bv %d: %4ph", i, it6505->bv[i]);
+ if ((it6505->bv[i][3] != it6505->av[i][0]) ||
+ (it6505->bv[i][2] != it6505->av[i][1]) ||
+ (it6505->bv[i][1] != it6505->av[i][2]) ||
+ (it6505->bv[i][0] != it6505->av[i][3])) {
+ sha_pass = 0;
+ }
+ }
+ if (sha_pass) {
+ DRM_DEV_DEBUG_DRIVER(dev, "SHA check result pass!");
+ dptx_set_bits(it6505, 0x39, BIT(4), BIT(4));
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "SHA check result fail");
+ dptx_set_bits(it6505, 0x39, BIT(5), BIT(5));
+ }
+}
+
+static void to_fsm_state(struct it6505 *it6505, enum it6505_sys_state state)
+{
+ while (it6505->state != state && it6505->state != SYS_TRAINFAIL &&
+ it6505->state != SYS_NOROP) {
+ dptx_sys_fsm(it6505);
+ if (it6505->state == SYS_UNPLUG)
+ return;
+ }
+}
+
+static void go_on_fsm(struct it6505 *it6505);
+
+static void hpd_irq(struct it6505 *it6505)
+{
+ u8 dpcd_sink_count, dpcd_irq_vector;
+ u8 link_status[DP_LINK_STATUS_SIZE];
+ unsigned int bstatus;
+ struct device *dev = &it6505->client->dev;
+
+ dpcd_sink_count = dpcd_read(it6505, DP_SINK_COUNT);
+ dpcd_irq_vector = dpcd_read(it6505, DP_DEVICE_SERVICE_IRQ_VECTOR);
+ it6505_get_dpcd(it6505, DP_LANE0_1_STATUS, link_status,
+ ARRAY_SIZE(link_status));
+
+ DRM_DEV_DEBUG_DRIVER(dev, "dpcd_sink_count = 0x%x", dpcd_sink_count);
+ DRM_DEV_DEBUG_DRIVER(dev, "dpcd_irq_vector = 0x%x", dpcd_irq_vector);
+ DRM_DEV_DEBUG_DRIVER(dev, "link_status = %*ph",
+ (int)ARRAY_SIZE(link_status), link_status);
+ DRM_DEV_DEBUG_DRIVER(dev, "dpcd_sink_count:%d",
+ it6505->dpcd_sink_count);
+ if (!it6505->dpcd_sink_count) {
+ it6505_init_and_mask_on(it6505);
+ return;
+ }
+
+ if (dpcd_irq_vector & DP_CP_IRQ) {
+ bstatus = dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
+ dptx_set_bits(it6505, 0x39, 0x02, 0x02);
+ DRM_DEV_DEBUG_DRIVER(dev, "Receive CP_IRQ, bstatus = 0x%02x",
+ bstatus);
+ dptx_debug_print(it6505, 0x55, "");
+
+ if (bstatus & DP_BSTATUS_READY)
+ DRM_DEV_DEBUG_DRIVER(dev, "HDCP KSV list ready");
+
+ if (bstatus & DP_BSTATUS_LINK_FAILURE) {
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "Link Integrity Fail, restart HDCP");
+ return;
+ }
+ if (bstatus & DP_BSTATUS_R0_PRIME_READY) {
+ DRM_DEV_DEBUG_DRIVER(dev, "HDCP R0' ready");
+ go_on_fsm(it6505);
+ }
+ }
+
+ if (dp_link_status(link_status, DP_LANE_ALIGN_STATUS_UPDATED) &
+ DP_LINK_STATUS_UPDATED) {
+ if (!drm_dp_channel_eq_ok(link_status,
+ it6505->lane_count)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Link Re-Training");
+ dptx_set_bits(it6505, 0xD3, 0x30, 0x30);
+ dptx_set_bits(it6505, 0xE8, 0x33, 0x00);
+ msleep(500);
+ dptx_sys_chg(it6505, SYS_HPD);
+ go_on_fsm(it6505);
+ }
+ }
+}
+
+static void go_on_fsm(struct it6505 *it6505)
+{
+ struct device *dev = &it6505->client->dev;
+
+ if (it6505->dpcd_sink_count && it6505->cp_capable) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Support HDCP, cp_capable: %d",
+ it6505->cp_capable);
+ if (it6505->enable_hdcp) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Enable HDCP");
+ it6505->hdcp_flag = true;
+ to_fsm_state(it6505, SYS_HDCP);
+ dptx_sys_fsm(it6505);
+
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "Disable HDCP");
+ it6505->hdcp_flag = false;
+ to_fsm_state(it6505, SYS_NOROP);
+ }
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "Not support HDCP");
+ it6505->hdcp_flag = false;
+ to_fsm_state(it6505, SYS_NOROP);
+ }
+}
+
+static void it6505_check_reg06(struct it6505 *it6505, unsigned int reg06)
+{
+ unsigned int rddata;
+ struct device *dev = &it6505->client->dev;
+
+ if (reg06 & BIT(0)) {
+ /* hpd pin state change */
+ DRM_DEV_DEBUG_DRIVER(dev, "HPD Change Interrupt");
+ if (dptx_get_sink_hpd(it6505)) {
+ dptx_sys_chg(it6505, SYS_HPD);
+ dptx_sys_fsm(it6505);
+
+ if (it6505->edid) {
+ rddata = dptx_read(it6505, 0x0D);
+ if (rddata & BIT(2)) {
+ go_on_fsm(it6505);
+ } else {
+ dptx_set_bits(it6505, 0x05, 0x01, 0x00);
+ dptx_set_bits(it6505, 0x61, 0x02, 0x02);
+ dptx_set_bits(it6505, 0x61, 0x02, 0x00);
+ }
+ } else {
+ go_on_fsm(it6505);
+ }
+ } else {
+ dptx_sys_chg(it6505, SYS_UNPLUG);
+ dptx_sys_fsm(it6505);
+ return;
+ }
+ }
+
+ if (it6505->cp_capable) {
+ if (reg06 & BIT(4)) {
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "HDCP encryption Done Interrupt");
+ dptx_sys_chg(it6505, SYS_NOROP);
+ }
+
+ if (reg06 & BIT(3)) {
+ DRM_DEV_DEBUG_DRIVER(
+ dev, "HDCP encryption Fail Interrupt, retry");
+ it6505_init_and_mask_on(it6505);
+ }
+ }
+
+ if (reg06 & BIT(1)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "HPD IRQ Interrupt");
+ hpd_irq(it6505);
+ }
+
+ if (reg06 & BIT(2)) {
+ rddata = dptx_read(it6505, 0x0D);
+
+ if (rddata & BIT(2)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Video Stable On Interrupt");
+ if (it6505->state == SYS_HPD)
+ dptx_sys_chg(it6505, SYS_TRAIN);
+ go_on_fsm(it6505);
+
+ } else {
+ DRM_DEV_DEBUG_DRIVER(dev, "Video Stable Off Interrupt");
+ }
+ }
+}
+
+static void it6505_check_reg07(struct it6505 *it6505, unsigned int reg07)
+{
+ struct device *dev = &it6505->client->dev;
+ unsigned int len, i;
+ unsigned int bstatus;
+
+ if (it6505->state == SYS_UNPLUG)
+ return;
+ if (reg07 & BIT(0)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "AUX PC Request Fail Interrupt");
+ dptx_debug_print(it6505, 0x9F, "AUX status:");
+ }
+
+ if (reg07 & BIT(1)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "HDCP event Interrupt");
+ for (i = 0; i < 500; i++) {
+ bstatus = dpcd_read(it6505, DP_AUX_HDCP_BSTATUS);
+ usleep_range(2000, 3000);
+ if (bstatus & DP_BSTATUS_READY)
+ break;
+ }
+
+ /*
+ * Read Bstatus to determine what happened
+ */
+ DRM_DEV_DEBUG_DRIVER(dev, "Bstatus: 0x%02x", bstatus);
+ dptx_debug_print(it6505, 0x3B, "ar0_low");
+ dptx_debug_print(it6505, 0x3C, "ar0_high");
+ dptx_debug_print(it6505, 0x45, "br0_low");
+ dptx_debug_print(it6505, 0x46, "br0_high");
+
+ if (bstatus & DP_BSTATUS_READY) {
+ DRM_DEV_DEBUG_DRIVER(dev, "HDCP KSV list ready");
+ len = it6505_makeup_sha1_input(it6505);
+ sha1_digest(it6505, it6505->sha1_input, len,
+ (u8 *)it6505->av);
+ it6505_check_sha1_result(it6505);
+ }
+ }
+ if (it6505->enable_audio && (reg07 & BIT(2))) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Audio FIFO OverFlow Interrupt");
+ dptx_debug_print(it6505, 0xBE, "");
+ dptx_set_bits(it6505, 0xD3, 0x20, 0x20);
+ dptx_set_bits(it6505, 0xE8, 0x22, 0x00);
+ dptx_set_bits(it6505, 0xB8, 0x80, 0x80);
+ dptx_set_bits(it6505, 0xB8, 0x80, 0x00);
+ it6505_set_audio(it6505);
+ }
+ if (it6505->enable_audio && (reg07 & BIT(5)))
+ DRM_DEV_DEBUG_DRIVER(dev, "Audio infoframe packet done");
+}
+
+static void it6505_check_reg08(struct it6505 *it6505, unsigned int reg08)
+{
+ struct device *dev = &it6505->client->dev;
+
+ if (it6505->state == SYS_UNPLUG)
+ return;
+ if (it6505->enable_audio && (reg08 & BIT(1)))
+ DRM_DEV_DEBUG_DRIVER(dev, "Audio TimeStamp Packet Done!");
+
+ if (it6505->enable_audio && (reg08 & BIT(3))) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Audio M Error Interrupt ...");
+ show_audio_m_count(it6505);
+ }
+ if (reg08 & BIT(4)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "Link Training Fail Interrupt");
+ /* restart training */
+ dptx_sys_chg(it6505, SYS_TRAIN);
+ go_on_fsm(it6505);
+ }
+
+ if (reg08 & BIT(7)) {
+ DRM_DEV_DEBUG_DRIVER(dev, "IO Latch FIFO OverFlow Interrupt");
+ dptx_set_bits(it6505, 0x61, 0x02, 0x02);
+ dptx_set_bits(it6505, 0x61, 0x02, 0x00);
+ }
+}
+
+static void it6505_dptx_irq(struct it6505 *it6505)
+{
+ int reg06, reg07, reg08;
+ struct device *dev = &it6505->client->dev;
+
+ reg06 = dptx_read(it6505, 0x06);
+ reg07 = dptx_read(it6505, 0x07);
+ reg08 = dptx_read(it6505, 0x08);
+
+ dptx_write(it6505, 0x06, reg06);
+ dptx_write(it6505, 0x07, reg07);
+ dptx_write(it6505, 0x08, reg08);
+
+ DRM_DEV_DEBUG_DRIVER(dev, "reg06 = 0x%02x", reg06);
+ DRM_DEV_DEBUG_DRIVER(dev, "reg07 = 0x%02x", reg07);
+ DRM_DEV_DEBUG_DRIVER(dev, "reg08 = 0x%02x", reg08);
+ dptx_debug_print(it6505, 0x0D, "");
+
+ if (reg06 != 0)
+ it6505_check_reg06(it6505, reg06);
+
+ if (reg07 != 0)
+ it6505_check_reg07(it6505, reg07);
+
+ if (reg08 != 0)
+ it6505_check_reg08(it6505, reg08);
+}
+
+static void it6505_bridge_enable(struct drm_bridge *bridge)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+
+ if (!it6505->enable_drv_hold) {
+ it6505_int_mask_on(it6505);
+ dptx_sys_chg(it6505, SYS_HPD);
+ }
+}
+
+static void it6505_bridge_disable(struct drm_bridge *bridge)
+{
+ struct it6505 *it6505 = bridge_to_it6505(bridge);
+
+ dptx_sys_chg(it6505, SYS_UNPLUG);
+}
+
+static const struct drm_bridge_funcs it6505_bridge_funcs = {
+ .attach = it6505_bridge_attach,
+ .detach = it6505_bridge_detach,
+ .mode_valid = it6505_bridge_mode_valid,
+ .mode_set = it6505_bridge_mode_set,
+ .enable = it6505_bridge_enable,
+ .disable = it6505_bridge_disable,
+};
+
+static void it6505_clear_int(struct it6505 *it6505)
+{
+ dptx_write(it6505, 0x06, 0xFF);
+ dptx_write(it6505, 0x07, 0xFF);
+ dptx_write(it6505, 0x08, 0xFF);
+}
+
+static irqreturn_t it6505_intp_threaded_handler(int unused, void *data)
+{
+ struct it6505 *it6505 = data;
+ struct device *dev = &it6505->client->dev;
+
+ msleep(150);
+ mutex_lock(&it6505->lock);
+
+ if (it6505->enable_drv_hold == 0 && it6505->powered) {
+ DRM_DEV_DEBUG_DRIVER(dev, "into it6505_dptx_irq");
+ it6505_dptx_irq(it6505);
+ }
+
+ mutex_unlock(&it6505->lock);
+ return IRQ_HANDLED;
+}
+
+static int it6505_init_pdata(struct it6505 *it6505)
+{
+ struct it6505_platform_data *pdata = &it6505->pdata;
+ struct device *dev = &it6505->client->dev;
+
+ /* 1.0V digital core power regulator */
+ pdata->pwr18 = devm_regulator_get(dev, "pwr18");
+ if (IS_ERR(pdata->pwr18)) {
+ DRM_DEV_ERROR(dev, "pwr18 regulator not found");
+ return PTR_ERR(pdata->pwr18);
+ }
+
+ pdata->ovdd = devm_regulator_get(dev, "ovdd");
+ if (IS_ERR(pdata->ovdd)) {
+ DRM_DEV_ERROR(dev, "ovdd regulator not found");
+ return PTR_ERR(pdata->ovdd);
+ }
+
+ /* GPIO for HPD */
+ pdata->gpiod_hpd = devm_gpiod_get(dev, "hpd", GPIOD_IN);
+ if (IS_ERR(pdata->gpiod_hpd))
+ return PTR_ERR(pdata->gpiod_hpd);
+
+ /* GPIO for chip reset */
+ pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+
+ return PTR_ERR_OR_ZERO(pdata->gpiod_reset);
+}
+
+static int it6505_bridge_resume(struct device *dev)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ return it6505_poweron(it6505);
+}
+
+static int it6505_bridge_suspend(struct device *dev)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ return it6505_poweroff(it6505);
+}
+
+static SIMPLE_DEV_PM_OPS(it6505_bridge_pm_ops, it6505_bridge_suspend,
+ it6505_bridge_resume);
+
+static ssize_t enable_drv_hold_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", it6505->enable_drv_hold);
+}
+
+static ssize_t enable_drv_hold_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ unsigned int drv_hold;
+
+ if (kstrtoint(buf, 10, &drv_hold) < 0)
+ return -EINVAL;
+
+ it6505->enable_drv_hold = drv_hold ? true : false;
+
+ if (it6505->enable_drv_hold) {
+ it6505_int_mask_off(it6505);
+ } else {
+ it6505_clear_int(it6505);
+ it6505_int_mask_on(it6505);
+ }
+ return count;
+}
+
+static ssize_t print_timing_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ struct drm_display_mode *vid = &it6505->video_info;
+ char *str = buf, *end = buf + PAGE_SIZE;
+
+ str += scnprintf(str, end - str, "---video timing---\n");
+ str += scnprintf(str, end - str, "PCLK:%d.%03dMHz\n", vid->clock / 1000,
+ vid->clock % 1000);
+ str += scnprintf(str, end - str, "HTotal:%d\n", vid->htotal);
+ str += scnprintf(str, end - str, "HActive:%d\n", vid->hdisplay);
+ str += scnprintf(str, end - str, "HFrontPorch:%d\n",
+ vid->hsync_start - vid->hdisplay);
+ str += scnprintf(str, end - str, "HSyncWidth:%d\n",
+ vid->hsync_end - vid->hsync_start);
+ str += scnprintf(str, end - str, "HBackPorch:%d\n",
+ vid->htotal - vid->hsync_end);
+ str += scnprintf(str, end - str, "VTotal:%d\n", vid->vtotal);
+ str += scnprintf(str, end - str, "VActive:%d\n", vid->vdisplay);
+ str += scnprintf(str, end - str, "VFrontPorch:%d\n",
+ vid->vsync_start - vid->vdisplay);
+ str += scnprintf(str, end - str, "VSyncWidth:%d\n",
+ vid->vsync_end - vid->vsync_start);
+ str += scnprintf(str, end - str, "VBackPorch:%d\n",
+ vid->vtotal - vid->vsync_end);
+
+ return str - buf;
+}
+
+static ssize_t sha_debug_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int i = 0;
+ char *str = buf, *end = buf + PAGE_SIZE;
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ str += scnprintf(str, end - str, "sha input:\n");
+ for (i = 0; i < ARRAY_SIZE(it6505->sha1_input); i += 16)
+ str += scnprintf(str, end - str, "%16ph\n",
+ it6505->sha1_input + i);
+
+ str += scnprintf(str, end - str, "av:\n");
+ for (i = 0; i < ARRAY_SIZE(it6505->av); i++)
+ str += scnprintf(str, end - str, "%4ph\n", it6505->av[i]);
+
+ str += scnprintf(str, end - str, "bv:\n");
+ for (i = 0; i < ARRAY_SIZE(it6505->bv); i++)
+ str += scnprintf(str, end - str, "%4ph\n", it6505->bv[i]);
+
+ return end - str;
+}
+
+static ssize_t enable_hdcp_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", it6505->enable_hdcp);
+}
+
+static ssize_t enable_hdcp_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ unsigned int reg3f, hdcp;
+
+ if (kstrtoint(buf, 10, &hdcp) < 0)
+ return -EINVAL;
+
+ if (!it6505->powered || it6505->state == SYS_UNPLUG) {
+ DRM_DEV_DEBUG_DRIVER(dev,
+ "power down or unplug, can not fire HDCP");
+ return -EINVAL;
+ }
+ it6505->enable_hdcp = hdcp ? true : false;
+
+ if (it6505->enable_hdcp) {
+ if (it6505->cp_capable) {
+ dptx_sys_chg(it6505, SYS_HDCP);
+ dptx_sys_fsm(it6505);
+ } else {
+ DRM_DEV_ERROR(dev, "sink not support HDCP");
+ }
+ } else {
+ dptx_set_bits(it6505, 0x05, 0x10, 0x10);
+ dptx_set_bits(it6505, 0x05, 0x10, 0x00);
+ reg3f = dptx_read(it6505, 0x3F);
+ hdcp = (reg3f & BIT(7)) >> 7;
+ DRM_DEV_DEBUG_DRIVER(dev, "%s to disable hdcp",
+ hdcp ? "failed" : "succeeded");
+ }
+ return count;
+}
+
+static ssize_t force_pwronoff_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+ int pwr;
+
+ if (kstrtoint(buf, 10, &pwr) < 0)
+ return -EINVAL;
+ if (pwr)
+ it6505_poweron(it6505);
+ else
+ it6505_poweroff(it6505);
+ return count;
+}
+
+static ssize_t pwr_state_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct it6505 *it6505 = dev_get_drvdata(dev);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", it6505->powered);
+}
+
+static DEVICE_ATTR_RO(print_timing);
+static DEVICE_ATTR_RO(pwr_state);
+static DEVICE_ATTR_RO(sha_debug);
+static DEVICE_ATTR_WO(force_pwronoff);
+static DEVICE_ATTR_RW(enable_drv_hold);
+static DEVICE_ATTR_RW(enable_hdcp);
+
+static const struct attribute *it6505_attrs[] = {
+ &dev_attr_enable_drv_hold.attr,
+ &dev_attr_print_timing.attr,
+ &dev_attr_sha_debug.attr,
+ &dev_attr_enable_hdcp.attr,
+ &dev_attr_force_pwronoff.attr,
+ &dev_attr_pwr_state.attr,
+ NULL,
+};
+
+static void it6505_shutdown(struct i2c_client *client)
+{
+ struct it6505 *it6505 = dev_get_drvdata(&client->dev);
+
+ dptx_sys_chg(it6505, SYS_UNPLUG);
+}
+
+static int it6505_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct it6505 *it6505;
+ struct it6505_platform_data *pdata;
+ struct device *dev = &client->dev;
+ struct extcon_dev *extcon;
+ int err, intp_irq;
+
+ it6505 = devm_kzalloc(&client->dev, sizeof(*it6505), GFP_KERNEL);
+ if (!it6505)
+ return -ENOMEM;
+
+ mutex_init(&it6505->lock);
+ mutex_init(&it6505->mode_lock);
+
+ pdata = &it6505->pdata;
+
+ it6505->bridge.of_node = client->dev.of_node;
+ it6505->client = client;
+ i2c_set_clientdata(client, it6505);
+
+ /* get extcon device from DTS */
+ extcon = extcon_get_edev_by_phandle(dev, 0);
+ if (PTR_ERR(extcon) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ if (IS_ERR(extcon)) {
+ DRM_DEV_ERROR(dev, "can not get extcon device!");
+ return -EINVAL;
+ }
+
+ it6505->extcon = extcon;
+
+ it6505->lane_swap_disabled =
+ device_property_read_bool(dev, "no-laneswap");
+
+ err = it6505_init_pdata(it6505);
+ if (err) {
+ DRM_DEV_ERROR(dev, "Failed to initialize pdata: %d", err);
+ return err;
+ }
+
+ it6505->regmap =
+ devm_regmap_init_i2c(client, &it6505_bridge_regmap_config);
+ if (IS_ERR(it6505->regmap)) {
+ DRM_DEV_ERROR(dev, "regmap i2c init failed");
+ return PTR_ERR(it6505->regmap);
+ }
+
+ intp_irq = client->irq;
+
+ if (!intp_irq) {
+ DRM_DEV_ERROR(dev, "Failed to get CABLE_DET and INTP IRQ");
+ return -ENODEV;
+ }
+
+ err = devm_request_threaded_irq(&client->dev, intp_irq, NULL,
+ it6505_intp_threaded_handler,
+ IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+ "it6505-intp", it6505);
+ if (err) {
+ DRM_DEV_ERROR(dev, "Failed to request INTP threaded IRQ: %d",
+ err);
+ return err;
+ }
+
+ /* Register aux channel */
+ it6505->aux.name = "DP-AUX";
+ it6505->aux.dev = dev;
+ it6505->aux.transfer = it6505_aux_transfer;
+ err = drm_dp_aux_register(&it6505->aux);
+ if (err < 0) {
+ DRM_DEV_ERROR(dev, "Failed to register aux: %d", err);
+ return err;
+ }
+
+ it6505->enable_drv_hold = DEFAULT_DRV_HOLD;
+ it6505->enable_hdcp = true;
+ it6505->enable_audio = false;
+ it6505->enable_auto_train = true;
+ it6505->powered = false;
+
+ if (DEFAULT_PWR_ON)
+ it6505_poweron(it6505);
+ err = sysfs_create_files(&client->dev.kobj, it6505_attrs);
+ if (err) {
+ drm_dp_aux_unregister(&it6505->aux);
+ return err;
+ }
+
+ it6505->bridge.funcs = &it6505_bridge_funcs;
+ drm_bridge_add(&it6505->bridge);
+ return 0;
+}
+
+static int it6505_remove(struct i2c_client *client)
+{
+ struct it6505 *it6505 = i2c_get_clientdata(client);
+
+ drm_connector_unregister(&it6505->connector);
+ drm_connector_cleanup(&it6505->connector);
+ drm_bridge_remove(&it6505->bridge);
+ sysfs_remove_files(&client->dev.kobj, it6505_attrs);
+ drm_dp_aux_unregister(&it6505->aux);
+ it6505_poweroff(it6505);
+ return 0;
+}
+
+static const struct i2c_device_id it6505_id[] = {
+ { "it6505", 0 },
+ { }
+};
+
+MODULE_DEVICE_TABLE(i2c, it6505_id);
+
+static const struct of_device_id it6505_of_match[] = {
+ { .compatible = "ite,it6505" },
+ { }
+};
+
+static struct i2c_driver it6505_i2c_driver = {
+ .driver = {
+ .name = "it6505_dptx",
+ .of_match_table = it6505_of_match,
+ .pm = &it6505_bridge_pm_ops,
+ },
+ .probe = it6505_i2c_probe,
+ .remove = it6505_remove,
+ .shutdown = it6505_shutdown,
+ .id_table = it6505_id,
+};
+
+module_i2c_driver(it6505_i2c_driver);
+
+MODULE_AUTHOR("Jitao Shi <jitao.shi@xxxxxxxxxxxx>");
+MODULE_DESCRIPTION("IT6505 DisplayPort Transmitter driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1

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