[PATCH 3/3] drm/bridge: Introduce LT9611 DSI to HDMI bridge

From: Vinod Koul
Date: Wed May 13 2020 - 06:06:18 EST

Lontium Lt9611 is a DSI to HDMI bridge which supports two DSI ports and
I2S port as an input and HDMI port as output

Co-developed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx>
---
drivers/gpu/drm/bridge/Kconfig | 13 +
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/lt9611.c | 1113 +++++++++++++++++++++++++++++++
3 files changed, 1127 insertions(+)
create mode 100644 drivers/gpu/drm/bridge/lt9611.c

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index aaed2347ace9..5cac15ce2027 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -38,6 +38,19 @@ config DRM_DISPLAY_CONNECTOR
on ARM-based platforms. Saying Y here when this driver is not needed
will not cause any issue.

+config DRM_LONTIUM_LT9611
+ tristate "Lontium LT9611 DSI/HDMI bridge"
+ select SND_SOC_HDMI_CODEC if SND_SOC
+ depends on OF
+ select DRM_PANEL_BRIDGE
+ select DRM_KMS_HELPER
+ select REGMAP_I2C
+ help
+ Driver for Lontium LT9611 DSI to HDMI bridge
+ chip driver that converts dual DSI and I2S to
+ HDMI signals
+ Please say Y if you have such hardware.
+
config DRM_LVDS_CODEC
tristate "Transparent LVDS encoders and decoders support"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index 6fb062b5b0f0..d2a696e8ca5d 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
+obj-$(CONFIG_DRM_LONTIUM_LT9611) += lt9611.o
obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/lt9611.c b/drivers/gpu/drm/bridge/lt9611.c
new file mode 100644
index 000000000000..e6e7ce43980d
--- /dev/null
+++ b/drivers/gpu/drm/bridge/lt9611.c
@@ -0,0 +1,1113 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2019-2020. Linaro Limited.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/interrupt.h>
+#include <linux/of_graph.h>
+#include <linux/regulator/consumer.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_print.h>
+
+#define EDID_SEG_SIZE 256
+
+#define LT9611_4LANES 0
+
+struct lt9611 {
+ struct device *dev;
+ struct drm_bridge bridge;
+ struct drm_connector connector;
+
+ struct regmap *regmap;
+
+ struct device_node *dsi0_node;
+ struct device_node *dsi1_node;
+ struct mipi_dsi_device *dsi0;
+ struct mipi_dsi_device *dsi1;
+
+ bool ac_mode;
+
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *enable_gpio;
+
+ bool power_on;
+ bool sleep;
+
+ struct regulator_bulk_data supplies[2];
+
+ struct i2c_client *client;
+
+ enum drm_connector_status status;
+
+ u8 edid_buf[EDID_SEG_SIZE];
+ u32 vic;
+};
+
+#define LT9611_PAGE_CONTROL 0xff
+
+static const struct regmap_range_cfg lt9611_ranges[] = {
+ {
+ .name = "register_range",
+ .range_min = 0,
+ .range_max = 0x85ff,
+ .selector_reg = LT9611_PAGE_CONTROL,
+ .selector_mask = 0xff,
+ .selector_shift = 0,
+ .window_start = 0,
+ .window_len = 0x100,
+ },
+};
+
+static const struct regmap_config lt9611_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = 0xffff,
+ .ranges = lt9611_ranges,
+ .num_ranges = ARRAY_SIZE(lt9611_ranges),
+};
+
+struct lt9611_mode {
+ u16 hdisplay;
+ u16 vdisplay;
+ u8 fps;
+ u8 lanes;
+ u8 intfs;
+};
+
+static struct lt9611_mode lt9611_modes[] = {
+ { 3840, 2160, 30, 4, 2 }, /* 3840x2160 24bit 30Hz 4Lane 2ports */
+ { 1920, 1080, 60, 4, 1 }, /* 1080P 24bit 60Hz 4lane 1port */
+ { 1920, 1080, 30, 3, 1 }, /* 1080P 24bit 30Hz 3lane 1port */
+ { 1920, 1080, 24, 3, 1 },
+ { 720, 480, 60, 4, 1 },
+ { 720, 576, 50, 2, 1 },
+ { 640, 480, 60, 2, 1 },
+};
+
+static struct lt9611 *bridge_to_lt9611(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct lt9611, bridge);
+}
+
+static struct lt9611 *connector_to_lt9611(struct drm_connector *connector)
+{
+ return container_of(connector, struct lt9611, connector);
+}
+
+static int lt9611_mipi_input_analog(struct lt9611 *lt9611)
+{
+ struct reg_sequence reg_cfg[] = {
+ { 0x8106, 0x40 }, /*port A rx current*/
+ { 0x810a, 0xfe }, /*port A ldo voltage set*/
+ { 0x810b, 0xbf }, /*enable port A lprx*/
+ { 0x8111, 0x40 }, /*port B rx current*/
+ { 0x8115, 0xfe }, /*port B ldo voltage set*/
+ { 0x8116, 0xbf }, /*enable port B lprx*/
+
+ { 0x811c, 0x03 }, /*PortA clk lane no-LP mode*/
+ { 0x8120, 0x03 }, /*PortB clk lane with-LP mode*/
+ };
+
+ regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+
+ return 0;
+}
+
+static int lt9611_mipi_input_digital(struct lt9611 *lt9611,
+ const struct drm_display_mode *mode)
+{
+ regmap_write(lt9611->regmap, 0x8300, LT9611_4LANES);
+
+ if (mode->hdisplay == 3840)
+ regmap_write(lt9611->regmap, 0x830a, 0x03);
+ else
+ regmap_write(lt9611->regmap, 0x830a, 0x00);
+
+ regmap_write(lt9611->regmap, 0x824f, 0x80);
+ regmap_write(lt9611->regmap, 0x8250, 0x10);
+ regmap_write(lt9611->regmap, 0x8302, 0x0a);
+ regmap_write(lt9611->regmap, 0x8306, 0x0a);
+
+ return 0;
+}
+
+static void lt9611_mipi_video_setup(struct lt9611 *lt9611,
+ const struct drm_display_mode *mode)
+{
+ u32 h_total, h_act, hpw, hfp, hss;
+ u32 v_total, v_act, vpw, vfp, vss;
+
+ h_total = mode->htotal;
+ v_total = mode->vtotal;
+
+ h_act = mode->hdisplay;
+ hpw = mode->hsync_end - mode->hsync_start;
+ hfp = mode->hsync_start - mode->hdisplay;
+ hss = (mode->hsync_end - mode->hsync_start) +
+ (mode->htotal - mode->hsync_end);
+
+ v_act = mode->vdisplay;
+ vpw = mode->vsync_end - mode->vsync_start;
+ vfp = mode->vsync_start - mode->vdisplay;
+ vss = (mode->vsync_end - mode->vsync_start) +
+ (mode->vtotal - mode->vsync_end);
+
+ regmap_write(lt9611->regmap, 0x830d, (u8)(v_total / 256));
+ regmap_write(lt9611->regmap, 0x830e, (u8)(v_total % 256));
+
+ regmap_write(lt9611->regmap, 0x830f, (u8)(v_act / 256));
+ regmap_write(lt9611->regmap, 0x8310, (u8)(v_act % 256));
+
+ regmap_write(lt9611->regmap, 0x8311, (u8)(h_total / 256));
+ regmap_write(lt9611->regmap, 0x8312, (u8)(h_total % 256));
+
+ regmap_write(lt9611->regmap, 0x8313, (u8)(h_act / 256));
+ regmap_write(lt9611->regmap, 0x8314, (u8)(h_act % 256));
+
+ regmap_write(lt9611->regmap, 0x8315, (u8)(vpw % 256));
+ regmap_write(lt9611->regmap, 0x8316, (u8)(hpw % 256));
+
+ regmap_write(lt9611->regmap, 0x8317, (u8)(vfp % 256));
+
+ regmap_write(lt9611->regmap, 0x8318, (u8)(vss % 256));
+
+ regmap_write(lt9611->regmap, 0x8319, (u8)(hfp % 256));
+
+ regmap_write(lt9611->regmap, 0x831a, (u8)(hss / 256));
+ regmap_write(lt9611->regmap, 0x831b, (u8)(hss % 256));
+}
+
+static int lt9611_pcr_setup(struct lt9611 *lt9611,
+ const struct drm_display_mode *mode)
+{
+ struct reg_sequence reg_cfg[] = {
+ { 0x830b, 0x01 },
+ { 0x830c, 0x10 },
+ { 0x8348, 0x00 },
+ { 0x8349, 0x81 },
+
+ /* stage 1 */
+ { 0x8321, 0x4a },
+ { 0x8324, 0x71 },
+ { 0x8325, 0x30 },
+ { 0x832a, 0x01 },
+
+ /* stage 2 */
+ { 0x834a, 0x40 },
+ { 0x831d, 0x10 },
+
+ /* MK limit */
+ { 0x832d, 0x38 },
+ { 0x8331, 0x08 },
+ };
+
+ regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+
+ switch (mode->hdisplay) {
+ case 640:
+ regmap_write(lt9611->regmap, 0x8326, 0x14);
+ break;
+ case 1920:
+ regmap_write(lt9611->regmap, 0x8326, 0x37);
+ break;
+ case 3840:
+ regmap_write(lt9611->regmap, 0x830b, 0x03);
+ regmap_write(lt9611->regmap, 0x830c, 0xd0);
+ regmap_write(lt9611->regmap, 0x8348, 0x03);
+ regmap_write(lt9611->regmap, 0x8349, 0xe0);
+ regmap_write(lt9611->regmap, 0x8324, 0x72);
+ regmap_write(lt9611->regmap, 0x8325, 0x00);
+ regmap_write(lt9611->regmap, 0x832a, 0x01);
+ regmap_write(lt9611->regmap, 0x834a, 0x10);
+ regmap_write(lt9611->regmap, 0x831d, 0x10);
+ regmap_write(lt9611->regmap, 0x8326, 0x37);
+ break;
+ }
+
+ /* pcr rst */
+ regmap_write(lt9611->regmap, 0x8011, 0x5a);
+ regmap_write(lt9611->regmap, 0x8011, 0xfa);
+
+ return 0;
+}
+
+static int lt9611_pll_setup(struct lt9611 *lt9611,
+ const struct drm_display_mode *mode)
+{
+ unsigned int pclk = mode->clock;
+ struct reg_sequence reg_cfg[] = {
+ /* txpll init */
+ { 0x8123, 0x40 },
+ { 0x8124, 0x64 },
+ { 0x8125, 0x80 },
+ { 0x8126, 0x55 },
+ { 0x812c, 0x37 },
+ { 0x812f, 0x01 },
+ { 0x8126, 0x55 },
+ { 0x8127, 0x66 },
+ { 0x8128, 0x88 },
+ };
+
+ regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+
+ if (pclk > 150000)
+ regmap_write(lt9611->regmap, 0x812d, 0x88);
+ else if (pclk > 70000)
+ regmap_write(lt9611->regmap, 0x812d, 0x99);
+ else
+ regmap_write(lt9611->regmap, 0x812d, 0xaa);
+
+ regmap_write(lt9611->regmap, 0x82e3, pclk >> 17); /* pclk[19:16] */
+ regmap_write(lt9611->regmap, 0x82e4, pclk >> 9); /* pclk[15:8] */
+ regmap_write(lt9611->regmap, 0x82e5, pclk >> 1); /* pclk[7:0] */
+
+ regmap_write(lt9611->regmap, 0x82de, 0x20);
+ regmap_write(lt9611->regmap, 0x82de, 0xe0);
+
+ regmap_write(lt9611->regmap, 0x8016, 0xf1);
+ regmap_write(lt9611->regmap, 0x8016, 0xf3);
+
+ return 0;
+}
+
+static int lt9611_video_check(struct lt9611 *lt9611)
+{
+ u32 v_total, v_act, h_act_a, h_act_b, h_total_sysclk;
+ unsigned int temp;
+ int ret;
+
+ /* top module video check */
+
+ /* v_act */
+ ret = regmap_read(lt9611->regmap, 0x8282, &temp);
+ if (ret)
+ goto end;
+
+ v_act = temp << 8;
+ ret = regmap_read(lt9611->regmap, 0x8283, &temp);
+ if (ret)
+ goto end;
+ v_act = v_act + temp;
+
+ /* v_total */
+ ret = regmap_read(lt9611->regmap, 0x826c, &temp);
+ if (ret)
+ goto end;
+ v_total = temp << 8;
+ ret = regmap_read(lt9611->regmap, 0x826d, &temp);
+ if (ret)
+ goto end;
+ v_total = v_total + temp;
+
+ /* h_total_sysclk */
+ ret = regmap_read(lt9611->regmap, 0x8286, &temp);
+ if (ret)
+ goto end;
+ h_total_sysclk = temp << 8;
+ ret = regmap_read(lt9611->regmap, 0x8287, &temp);
+ if (ret)
+ goto end;
+ h_total_sysclk = h_total_sysclk + temp;
+
+ /* h_act_a */
+ ret = regmap_read(lt9611->regmap, 0x8382, &temp);
+ if (ret)
+ goto end;
+ h_act_a = temp << 8;
+ ret = regmap_read(lt9611->regmap, 0x8383, &temp);
+ if (ret)
+ goto end;
+ h_act_a = (h_act_a + temp) / 3;
+
+ /* h_act_b */
+ ret = regmap_read(lt9611->regmap, 0x8386, &temp);
+ if (ret)
+ goto end;
+ h_act_b = temp << 8;
+ ret = regmap_read(lt9611->regmap, 0x8387, &temp);
+ if (ret)
+ goto end;
+ h_act_b = (h_act_b + temp) / 3;
+
+ dev_info(lt9611->dev,
+ "video check: h_act_a=%d, h_act_b=%d, v_act=%d, v_total=%d, h_total_sysclk=%d\n",
+ h_act_a, h_act_b, v_act, v_total, h_total_sysclk);
+
+ return 0;
+
+end:
+ dev_err(lt9611->dev, "read video check error\n");
+ return ret;
+}
+
+static void lt9611_hdmi_tx_digital(struct lt9611 *lt9611)
+{
+ regmap_write(lt9611->regmap, 0x8443, 0x46 - lt9611->vic);
+ regmap_write(lt9611->regmap, 0x8447, lt9611->vic);
+ regmap_write(lt9611->regmap, 0x843d, 0x0a); /* UD1 infoframe */
+
+ regmap_write(lt9611->regmap, 0x82d6, 0x8c);
+ regmap_write(lt9611->regmap, 0x82d7, 0x04);
+}
+
+static void lt9611_hdmi_tx_phy(struct lt9611 *lt9611)
+{
+ struct reg_sequence reg_cfg[] = {
+ { 0x8130, 0x6a },
+ { 0x8131, 0x44 }, /* HDMI DC mode */
+ { 0x8132, 0x4a },
+ { 0x8133, 0x0b },
+ { 0x8134, 0x00 },
+ { 0x8135, 0x00 },
+ { 0x8136, 0x00 },
+ { 0x8137, 0x44 },
+ { 0x813f, 0x0f },
+ { 0x8140, 0xa0 },
+ { 0x8141, 0xa0 },
+ { 0x8142, 0xa0 },
+ { 0x8143, 0xa0 },
+ { 0x8144, 0x0a },
+ };
+
+ /* HDMI AC mode */
+ if (lt9611->ac_mode)
+ reg_cfg[2].def = 0x73;
+
+ regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
+}
+
+static irqreturn_t lt9611_irq_thread_handler(int irq, void *dev_id)
+{
+ struct lt9611 *lt9611 = dev_id;
+ unsigned int irq_flag0 = 0;
+ unsigned int irq_flag3 = 0;
+
+ regmap_read(lt9611->regmap, 0x820f, &irq_flag3);
+ regmap_read(lt9611->regmap, 0x820c, &irq_flag0);
+
+ pr_debug("%s() irq_flag0: %#x irq_flag3: %#x\n",
+ __func__, irq_flag0, irq_flag3);
+
+ /* hpd changed low */
+ if (irq_flag3 & 0x80) {
+ dev_info(lt9611->dev, "hdmi cable disconnected\n");
+
+ regmap_write(lt9611->regmap, 0x8207, 0xbf);
+ regmap_write(lt9611->regmap, 0x8207, 0x3f);
+ }
+ /* hpd changed high */
+ if (irq_flag3 & 0x40) {
+ dev_info(lt9611->dev, "hdmi cable connected\n");
+
+ regmap_write(lt9611->regmap, 0x8207, 0x7f);
+ regmap_write(lt9611->regmap, 0x8207, 0x3f);
+ }
+
+ if (irq_flag3 & 0xc0)
+ drm_kms_helper_hotplug_event(lt9611->bridge.dev);
+
+ /* video input changed */
+ if (irq_flag0 & 0x01) {
+ dev_info(lt9611->dev, "video input changed\n");
+ regmap_write(lt9611->regmap, 0x829e, 0xff);
+ regmap_write(lt9611->regmap, 0x829e, 0xf7);
+ regmap_write(lt9611->regmap, 0x8204, 0xff);
+ regmap_write(lt9611->regmap, 0x8204, 0xfe);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static void lt9611_enable_hpd_interrupts(struct lt9611 *lt9611)
+{
+ unsigned int val;
+
+ dev_dbg(lt9611->dev, "enabling hpd interrupts\n");
+
+ regmap_read(lt9611->regmap, 0x8203, &val);
+
+ val &= ~0xc0;
+ regmap_write(lt9611->regmap, 0x8203, val);
+ regmap_write(lt9611->regmap, 0x8207, 0xff); //clear
+ regmap_write(lt9611->regmap, 0x8207, 0x3f);
+}
+
+static void lt9611_sleep_setup(struct lt9611 *lt9611)
+{
+ struct reg_sequence sleep_setup[] = {
+ { 0x8024, 0x76 },
+ { 0x8023, 0x01 },
+ { 0x8157, 0x03 }, //set addr pin as output
+ { 0x8149, 0x0b },
+ { 0x8151, 0x30 }, //disable IRQ
+ { 0x8102, 0x48 }, //MIPI Rx power down
+ { 0x8123, 0x80 },
+ { 0x8130, 0x00 },
+ { 0x8100, 0x01 }, //bandgap power down
+ { 0x8101, 0x00 }, //system clk power down
+ };
+
+ dev_dbg(lt9611->dev, "sleep\n");
+
+ regmap_multi_reg_write(lt9611->regmap,
+ sleep_setup, ARRAY_SIZE(sleep_setup));
+ lt9611->sleep = true;
+}
+
+static int lt9611_power_on(struct lt9611 *lt9611)
+{
+ int ret;
+ const struct reg_sequence seq[] = {
+ /* LT9611_System_Init */
+ { 0x8101, 0x18 }, /* sel xtal clock */
+
+ /* timer for frequency meter */
+ { 0x821b, 0x69 }, /*timer 2*/
+ { 0x821c, 0x78 },
+ { 0x82cb, 0x69 }, /*timer 1 */
+ { 0x82cc, 0x78 },
+
+ /* irq init */
+ { 0x8251, 0x01 },
+ { 0x8258, 0x0a }, /* hpd irq */
+ { 0x8259, 0x80 }, /* hpd debounce width */
+ { 0x829e, 0xf7 }, /* video check irq */
+
+ /* power consumption for work */
+ { 0x8004, 0xf0 },
+ { 0x8006, 0xf0 },
+ { 0x800a, 0x80 },
+ { 0x800b, 0x40 },
+ { 0x800d, 0xef },
+ { 0x8011, 0xfa },
+ };
+
+ if (lt9611->power_on)
+ return 0;
+
+ dev_dbg(lt9611->dev, "power on\n");
+
+ ret = regmap_multi_reg_write(lt9611->regmap, seq, ARRAY_SIZE(seq));
+ if (!ret)
+ lt9611->power_on = true;
+
+ return ret;
+}
+
+static int lt9611_power_off(struct lt9611 *lt9611)
+{
+ int ret;
+
+ dev_dbg(lt9611->dev, "power off\n");
+
+ ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
+ if (!ret)
+ lt9611->power_on = false;
+
+ return ret;
+}
+
+static void lt9611_reset(struct lt9611 *lt9611)
+{
+ gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
+ msleep(20);
+ gpiod_set_value_cansleep(lt9611->reset_gpio, 0);
+ msleep(20);
+ gpiod_set_value_cansleep(lt9611->reset_gpio, 1);
+ msleep(100);
+}
+
+static void lt9611_assert_5v(struct lt9611 *lt9611)
+{
+ if (!lt9611->enable_gpio)
+ return;
+
+ gpiod_set_value_cansleep(lt9611->enable_gpio, 1);
+ msleep(20);
+}
+
+static int lt9611_regulator_init(struct lt9611 *lt9611)
+{
+ int ret;
+
+ lt9611->supplies[0].supply = "vdd";
+ lt9611->supplies[1].supply = "vcc";
+ ret = devm_regulator_bulk_get(lt9611->dev, 2, lt9611->supplies);
+ if (ret < 0)
+ return ret;
+
+ return regulator_set_load(lt9611->supplies[0].consumer, 300000);
+}
+
+static int lt9611_regulator_enable(struct lt9611 *lt9611)
+{
+ int ret;
+
+ ret = regulator_enable(lt9611->supplies[0].consumer);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(1000, 10000);
+
+ ret = regulator_enable(lt9611->supplies[1].consumer);
+ if (ret < 0) {
+ regulator_disable(lt9611->supplies[0].consumer);
+ return ret;
+ }
+
+ return 0;
+}
+
+static struct lt9611_mode *lt9611_find_mode(const struct drm_display_mode *mode)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(lt9611_modes); i++) {
+ if (lt9611_modes[i].hdisplay == mode->hdisplay &&
+ lt9611_modes[i].vdisplay == mode->vdisplay &&
+ lt9611_modes[i].fps == drm_mode_vrefresh(mode)) {
+ return &lt9611_modes[i];
+ }
+ }
+
+ return NULL;
+}
+
+/* connector funcs */
+static enum drm_connector_status
+lt9611_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct lt9611 *lt9611 = connector_to_lt9611(connector);
+ unsigned int reg_val = 0;
+ int connected = 0;
+
+ regmap_read(lt9611->regmap, 0x825e, &reg_val);
+ connected = (reg_val & BIT(2));
+ dev_dbg(lt9611->dev, "connected = %x\n", connected);
+
+ lt9611->status = connected ? connector_status_connected :
+ connector_status_disconnected;
+
+ return lt9611->status;
+}
+
+static int lt9611_read_edid(struct lt9611 *lt9611)
+{
+ unsigned int temp;
+ int ret = 0;
+ int i, j;
+
+ memset(lt9611->edid_buf, 0, EDID_SEG_SIZE);
+
+ regmap_write(lt9611->regmap, 0x8503, 0xc9);
+
+ /* 0xA0 is EDID device address */
+ regmap_write(lt9611->regmap, 0x8504, 0xa0);
+ /* 0x00 is EDID offset address */
+ regmap_write(lt9611->regmap, 0x8505, 0x00);
+ /* length for read */
+ regmap_write(lt9611->regmap, 0x8506, 0x20);
+ regmap_write(lt9611->regmap, 0x8514, 0x7f);
+
+ for (i = 0 ; i < 8 ; i++) {
+ /* offset address */
+ regmap_write(lt9611->regmap, 0x8505, i * 32);
+ regmap_write(lt9611->regmap, 0x8507, 0x36);
+ regmap_write(lt9611->regmap, 0x8507, 0x31);
+ regmap_write(lt9611->regmap, 0x8507, 0x37);
+ usleep_range(5000, 10000);
+
+ regmap_read(lt9611->regmap, 0x8540, &temp);
+
+ if (temp & 0x02) { /*KEY_DDC_ACCS_DONE=1*/
+ for (j = 0; j < 32; j++) {
+ regmap_read(lt9611->regmap, 0x8583, &temp);
+ lt9611->edid_buf[i * 32 + j] = temp;
+ }
+ } else if (temp & 0x50) { /* DDC No Ack or Abitration lost */
+ dev_err(lt9611->dev, "read edid failed: no ack\n");
+ ret = -EIO;
+ goto end;
+ } else {
+ dev_err(lt9611->dev,
+ "read edid failed: access not done\n");
+ ret = -EIO;
+ goto end;
+ }
+ }
+
+ dev_dbg(lt9611->dev, "read edid succeeded, checksum = 0x%x\n",
+ lt9611->edid_buf[255]);
+
+end:
+ regmap_write(lt9611->regmap, 0x8507, 0x1f);
+ return ret;
+}
+
+/* TODO: add support for more extension blocks */
+static int
+lt9611_get_edid_block(void *data, u8 *buf, unsigned int block, size_t len)
+{
+ struct lt9611 *lt9611 = data;
+ int ret;
+
+ dev_dbg(lt9611->dev, "get edid block: block=%d, len=%d\n",
+ block, (int)len);
+
+ if (len > 128)
+ return -EINVAL;
+
+ /* support up to 1 extension block */
+ if (block > 1)
+ return -EINVAL;
+
+ if (block == 0) {
+ /* always read 2 edid blocks once */
+ ret = lt9611_read_edid(lt9611);
+ if (ret) {
+ dev_err(lt9611->dev, "edid read failed\n");
+ return ret;
+ }
+ }
+
+ if (block % 2 == 0)
+ memcpy(buf, lt9611->edid_buf, len);
+ else
+ memcpy(buf, lt9611->edid_buf + 128, len);
+
+ return 0;
+}
+
+static int lt9611_connector_get_modes(struct drm_connector *connector)
+{
+ struct lt9611 *lt9611 = connector_to_lt9611(connector);
+ unsigned int count;
+ struct edid *edid;
+
+ dev_dbg(lt9611->dev, "get modes\n");
+
+ lt9611_power_on(lt9611);
+ edid = drm_do_get_edid(connector, lt9611_get_edid_block, lt9611);
+ drm_connector_update_edid_property(connector, edid);
+ count = drm_add_edid_modes(connector, edid);
+ kfree(edid);
+
+ return count;
+}
+
+static enum drm_mode_status
+lt9611_connector_mode_valid(struct drm_connector *connector,
+ struct drm_display_mode *mode)
+{
+ struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
+
+ return lt9611_mode ? MODE_OK : MODE_BAD;
+}
+
+/* bridge funcs */
+static void lt9611_bridge_enable(struct drm_bridge *bridge)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+ dev_dbg(lt9611->dev, "bridge enable\n");
+
+ if (lt9611_power_on(lt9611)) {
+ dev_err(lt9611->dev, "power on failed\n");
+ return;
+ }
+
+ dev_dbg(lt9611->dev, "video on\n");
+
+ lt9611_mipi_input_analog(lt9611);
+ lt9611_hdmi_tx_digital(lt9611);
+ lt9611_hdmi_tx_phy(lt9611);
+
+ msleep(500);
+
+ lt9611_video_check(lt9611);
+
+ /* Enable HDMI output */
+ regmap_write(lt9611->regmap, 0x8130, 0xea);
+}
+
+static void lt9611_bridge_disable(struct drm_bridge *bridge)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+ int ret;
+
+ dev_dbg(lt9611->dev, "bridge disable\n");
+
+ /* Disable HDMI output */
+ ret = regmap_write(lt9611->regmap, 0x8130, 0x6a);
+ if (ret) {
+ dev_err(lt9611->dev, "video on failed\n");
+ return;
+ }
+
+ if (lt9611_power_off(lt9611)) {
+ dev_err(lt9611->dev, "power on failed\n");
+ return;
+ }
+}
+
+static struct
+drm_connector_helper_funcs lt9611_bridge_connector_helper_funcs = {
+ .get_modes = lt9611_connector_get_modes,
+ .mode_valid = lt9611_connector_mode_valid,
+};
+
+static const struct drm_connector_funcs lt9611_bridge_connector_funcs = {
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = lt9611_connector_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 struct mipi_dsi_device *lt9611_attach_dsi(struct lt9611 *lt9611,
+ struct device_node *dsi_node)
+{
+ const struct mipi_dsi_device_info info = { "lt9611", 0, NULL };
+ struct mipi_dsi_device *dsi;
+ struct mipi_dsi_host *host;
+ int ret;
+
+ host = of_find_mipi_dsi_host_by_node(dsi_node);
+ if (!host) {
+ dev_err(lt9611->dev, "failed to find dsi host\n");
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dsi)) {
+ dev_err(lt9611->dev, "failed to create dsi device\n");
+ return dsi;
+ }
+
+ dsi->lanes = 4;
+ dsi->format = MIPI_DSI_FMT_RGB888;
+ dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+ MIPI_DSI_MODE_VIDEO_HSE;
+
+ ret = mipi_dsi_attach(dsi);
+ if (ret < 0) {
+ dev_err(lt9611->dev, "failed to attach dsi to host\n");
+ mipi_dsi_device_unregister(dsi);
+ return ERR_PTR(ret);
+ }
+
+ return dsi;
+}
+
+static int lt9611_bridge_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+ int ret;
+
+ dev_dbg(lt9611->dev, "bridge attach\n");
+
+ ret = drm_connector_init(bridge->dev, &lt9611->connector,
+ &lt9611_bridge_connector_funcs,
+ DRM_MODE_CONNECTOR_HDMIA);
+ if (ret) {
+ DRM_ERROR("Failed to initialize connector with drm\n");
+ return ret;
+ }
+
+ drm_connector_helper_add(&lt9611->connector,
+ &lt9611_bridge_connector_helper_funcs);
+ drm_connector_attach_encoder(&lt9611->connector, bridge->encoder);
+
+ if (!bridge->encoder) {
+ DRM_ERROR("Parent encoder object not found");
+ return -ENODEV;
+ }
+
+ /* Attach primary DSI */
+ lt9611->dsi0 = lt9611_attach_dsi(lt9611, lt9611->dsi0_node);
+ if (IS_ERR(lt9611->dsi0))
+ return PTR_ERR(lt9611->dsi0);
+
+ /* Attach secondary DSI, if specified */
+ if (lt9611->dsi1_node) {
+ lt9611->dsi1 = lt9611_attach_dsi(lt9611, lt9611->dsi1_node);
+ if (IS_ERR(lt9611->dsi1)) {
+ ret = PTR_ERR(lt9611->dsi1);
+ goto err_unregister_dsi0;
+ }
+ }
+
+ return 0;
+
+err_unregister_dsi0:
+ mipi_dsi_device_unregister(lt9611->dsi0);
+
+ return ret;
+}
+
+static void lt9611_bridge_detach(struct drm_bridge *bridge)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+ if (lt9611->dsi1) {
+ mipi_dsi_detach(lt9611->dsi1);
+ mipi_dsi_device_unregister(lt9611->dsi1);
+ }
+
+ mipi_dsi_detach(lt9611->dsi0);
+ mipi_dsi_device_unregister(lt9611->dsi0);
+}
+
+static enum drm_mode_status
+lt9611_bridge_mode_valid(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode)
+{
+ struct lt9611_mode *lt9611_mode = lt9611_find_mode(mode);
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+ if (lt9611_mode->intfs > 1 && !lt9611->dsi1)
+ return MODE_PANEL;
+ else
+ return MODE_OK;
+}
+
+static void lt9611_bridge_pre_enable(struct drm_bridge *bridge)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+ dev_dbg(lt9611->dev, "bridge pre_enable\n");
+
+ if (!lt9611->sleep)
+ return;
+
+ lt9611_reset(lt9611);
+ regmap_write(lt9611->regmap, 0x80ee, 0x01);
+
+ lt9611->sleep = false;
+}
+
+static void lt9611_bridge_post_disable(struct drm_bridge *bridge)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+
+ dev_dbg(lt9611->dev, "bridge post_disable\n");
+
+ lt9611_sleep_setup(lt9611);
+}
+
+static void lt9611_bridge_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adj_mode)
+{
+ struct lt9611 *lt9611 = bridge_to_lt9611(bridge);
+ struct hdmi_avi_infoframe avi_frame;
+ int ret;
+
+ dev_dbg(lt9611->dev, "bridge mode_set: hdisplay=%d, vdisplay=%d, vrefresh=%d, clock=%d\n",
+ adj_mode->hdisplay, adj_mode->vdisplay,
+ adj_mode->vrefresh, adj_mode->clock);
+
+ lt9611_bridge_pre_enable(bridge);
+
+ lt9611_mipi_input_digital(lt9611, mode);
+ lt9611_pll_setup(lt9611, mode);
+ lt9611_mipi_video_setup(lt9611, mode);
+ lt9611_pcr_setup(lt9611, mode);
+
+ ret = drm_hdmi_avi_infoframe_from_display_mode(&avi_frame,
+ &lt9611->connector,
+ mode);
+ if (!ret)
+ lt9611->vic = avi_frame.video_code;
+}
+
+static const struct drm_bridge_funcs lt9611_bridge_funcs = {
+ .attach = lt9611_bridge_attach,
+ .detach = lt9611_bridge_detach,
+ .mode_valid = lt9611_bridge_mode_valid,
+ .enable = lt9611_bridge_enable,
+ .disable = lt9611_bridge_disable,
+ .post_disable = lt9611_bridge_post_disable,
+ .mode_set = lt9611_bridge_mode_set,
+};
+
+static int lt9611_parse_dt(struct device *dev,
+ struct lt9611 *lt9611)
+{
+ lt9611->dsi0_node = of_graph_get_remote_node(dev->of_node, 1, -1);
+ if (!lt9611->dsi0_node) {
+ DRM_DEV_ERROR(dev, "failed to get remote node for primary dsi\n");
+ return -ENODEV;
+ }
+
+ lt9611->dsi1_node = of_graph_get_remote_node(dev->of_node, 2, -1);
+
+ lt9611->ac_mode = of_property_read_bool(dev->of_node, "lt,ac-mode");
+ dev_dbg(lt9611->dev, "ac_mode=%d\n", lt9611->ac_mode);
+
+ return 0;
+}
+
+static int lt9611_gpio_init(struct lt9611 *lt9611)
+{
+ struct device *dev = lt9611->dev;
+
+ lt9611->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(lt9611->reset_gpio)) {
+ dev_err(dev, "failed to acquire reset gpio\n");
+ return PTR_ERR(lt9611->reset_gpio);
+ }
+
+ lt9611->enable_gpio = devm_gpiod_get_optional(dev, "enable",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(lt9611->enable_gpio)) {
+ dev_err(dev, "failed to acquire enable gpio\n");
+ return PTR_ERR(lt9611->enable_gpio);
+ }
+
+ return 0;
+}
+
+static int lt9611_read_device_rev(struct lt9611 *lt9611)
+{
+ unsigned int rev;
+ int ret;
+
+ regmap_write(lt9611->regmap, 0x80ee, 0x01);
+ ret = regmap_read(lt9611->regmap, 0x8002, &rev);
+ if (ret)
+ dev_err(lt9611->dev, "failed to read revision: %d\n", ret);
+
+ dev_info(lt9611->dev, "LT9611 revision: 0x%x\n", rev);
+
+ return ret;
+}
+
+static int lt9611_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct lt9611 *lt9611;
+ struct device *dev = &client->dev;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
+ dev_err(dev, "device doesn't support I2C\n");
+ return -ENODEV;
+ }
+
+ lt9611 = devm_kzalloc(dev, sizeof(*lt9611), GFP_KERNEL);
+ if (!lt9611)
+ return -ENOMEM;
+
+ lt9611->dev = &client->dev;
+ lt9611->client = client;
+ lt9611->sleep = false;
+
+ lt9611->regmap = devm_regmap_init_i2c(client, &lt9611_regmap_config);
+ if (IS_ERR(lt9611->regmap)) {
+ DRM_ERROR("regmap i2c init failed\n");
+ return PTR_ERR(lt9611->regmap);
+ }
+
+ ret = lt9611_parse_dt(&client->dev, lt9611);
+ if (ret) {
+ dev_err(dev, "failed to parse device tree\n");
+ return ret;
+ }
+
+ ret = lt9611_gpio_init(lt9611);
+ if (ret < 0)
+ return ret;
+
+ ret = lt9611_regulator_init(lt9611);
+ if (ret < 0)
+ return ret;
+
+ lt9611_assert_5v(lt9611);
+
+ ret = lt9611_regulator_enable(lt9611);
+ if (ret)
+ return ret;
+
+ lt9611_reset(lt9611);
+
+ ret = lt9611_read_device_rev(lt9611);
+ if (ret) {
+ dev_err(dev, "failed to read chip rev\n");
+ goto err_disable_regulators;
+ }
+
+ ret = devm_request_threaded_irq(dev, client->irq, NULL,
+ lt9611_irq_thread_handler,
+ IRQF_ONESHOT, "lt9611", lt9611);
+ if (ret) {
+ dev_err(dev, "failed to request irq\n");
+ goto err_disable_regulators;
+ }
+
+ i2c_set_clientdata(client, lt9611);
+
+ lt9611->bridge.funcs = &lt9611_bridge_funcs;
+ lt9611->bridge.of_node = client->dev.of_node;
+
+ drm_bridge_add(&lt9611->bridge);
+
+ lt9611_enable_hpd_interrupts(lt9611);
+
+ return 0;
+
+err_disable_regulators:
+ regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
+
+ of_node_put(lt9611->dsi0_node);
+ of_node_put(lt9611->dsi1_node);
+
+ return ret;
+}
+
+static int lt9611_remove(struct i2c_client *client)
+{
+ struct lt9611 *lt9611 = i2c_get_clientdata(client);
+
+ disable_irq(client->irq);
+ drm_bridge_remove(&lt9611->bridge);
+
+ regulator_bulk_disable(ARRAY_SIZE(lt9611->supplies), lt9611->supplies);
+
+ of_node_put(lt9611->dsi0_node);
+ of_node_put(lt9611->dsi1_node);
+
+ return 0;
+}
+
+static struct i2c_device_id lt9611_id[] = {
+ { "lontium,lt9611", 0},
+ {}
+};
+
+static const struct of_device_id lt9611_match_table[] = {
+ {.compatible = "lontium,lt9611"},
+ {}
+};
+MODULE_DEVICE_TABLE(of, lt9611_match_table);
+
+static struct i2c_driver lt9611_driver = {
+ .driver = {
+ .name = "lt9611",
+ .of_match_table = lt9611_match_table,
+ },
+ .probe = lt9611_probe,
+ .remove = lt9611_remove,
+ .id_table = lt9611_id,
+};
+module_i2c_driver(lt9611_driver);
+
+MODULE_LICENSE("GPL v2");
--
2.25.4