Re: [PATCH v13 2/2] drm/bridge: Add I2C based driver for ps8640 bridge

From: Daniel Kurtz
Date: Tue Mar 22 2016 - 13:54:00 EST

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In reply to: Jitao Shi: "[PATCH v13 2/2] drm/bridge: Add I2C based driver for ps8640 bridge"
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Hi Jitao,

This patch looks really good now.
Just saw small nits below.

Other than these small items, for the series:
Reviewed-by: Daniel Kurtz <djkurtz@xxxxxxxxxxxx>

On Thu, Mar 17, 2016 at 9:15 AM, Jitao Shi <jitao.shi@xxxxxxxxxxxx> wrote:
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi@xxxxxxxxxxxx>
> ---
> Changes since v12:
> - fix hw_chip_id build warning
>
> Changes since v11:
> - Remove depends on I2C, add DRM depends
> - Reuse ps8640_write_bytes() in ps8640_write_byte()
> - Use timer check for polling like the routines in <linux/iopoll.h>
> - Fix no drm_connector_unregister/drm_connector_cleanup when ps8640_bridge_attach fail
> - Check the ps8640 hardware id in ps8640_validate_firmware
> - Remove fw_version check
> - Move ps8640_validate_firmware before ps8640_enter_bl
> - Add ddc_i2c unregister when probe fail and ps8640_remove
>
> The following patches are needed to support dsi host through none dsi bus:
> https://patchwork.kernel.org/patch/8289181/ ("drm/dsi: check for CONFIG_OF when defining")
> https://patchwork.kernel.org/patch/8289051/ ("drm/dsi: Use mipi_dsi_device_register_full for DSI device")
> https://patchwork.kernel.org/patch/8289081/ ("drm/dsi: Try to match non-DT DSI devices")
> https://patchwork.kernel.org/patch/8289121/ ("drm/dsi: Add routine to unregister a DSI device")
> https://patchwork.kernel.org/patch/8289091/ ("drm/dsi: Get DSI host by DT device node")
> ---
> drivers/gpu/drm/bridge/Kconfig | 12 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/parade-ps8640.c | 1073 ++++++++++++++++++++++++++++++++
> 3 files changed, 1086 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 27e2022..be6084e 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -40,4 +40,16 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
> + depends on DRM
> + depends on OF
> + select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> + select DRM_PANEL
> + ---help---
> + Choose this option if you have PS8640 for display
> + The PS8640 is a high-performance and low-power
> + MIPI DSI to eDP converter
> +
> endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index f13c33d..fbe38dc 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
> obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 0000000..7bd5c12
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,1073 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/firmware.h>
> +#include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +#include <asm/unaligned.h>
> +#include <drm/drm_panel.h>
> +
> +#include <drmP.h>
> +#include <drm_atomic_helper.h>
> +#include <drm_crtc_helper.h>
> +#include <drm_crtc.h>
> +#include <drm_edid.h>
> +#include <drm_mipi_dsi.h>
> +
> +#define PAGE2_SPI_CFG3 0x82
> +#define I2C_TO_SPI_RESET 0x20
> +#define PAGE2_ROMADD_BYTE1 0x8e
> +#define PAGE2_ROMADD_BYTE2 0x8f
> +#define PAGE2_SWSPI_WDATA 0x90
> +#define PAGE2_SWSPI_RDATA 0x91
> +#define PAGE2_SWSPI_LEN 0x92
> +#define PAGE2_SWSPI_CTL 0x93
> +#define TRIGGER_NO_READBACK 0x05
> +#define TRIGGER_READBACK 0x01
> +#define PAGE2_SPI_STATUS 0x9e
> +#define PAGE2_GPIO_L 0xa6
> +#define PAGE2_GPIO_H 0xa7
> +#define PS_GPIO9 BIT(1)
> +#define PAGE2_IROM_CTRL 0xb0
> +#define IROM_ENABLE 0xc0
> +#define IROM_DISABLE 0x80
> +#define PAGE2_SW_REST 0xbc

Is this supposed to be "PAGE2_SW_RESET"?

> +#define SPI_SW_RESET BIT(7)
> +#define MPU_SW_RESET BIT(6)
> +#define PAGE2_ENCTLSPI_WR 0xda
> +#define PAGE2_I2C_BYPASS 0xea
> +#define I2C_BYPASS_EN 0xd0
> +#define PAGE3_SET_ADD 0xfe
> +#define PAGE3_SET_VAL 0xff
> +#define VDO_CTL_ADD 0x13
> +#define VDO_DIS 0x18
> +#define VDO_EN 0x1c
> +#define PAGE4_REV_L 0xf0
> +#define PAGE4_REV_H 0xf1
> +#define PAGE4_CHIP_L 0xf2
> +#define PAGE4_CHIP_H 0xf3
> +
> +/* Firmware */
> +#define SPI_MAX_RETRY_CNT 8
> +#define PS_FW_NAME "ps864x_fw.bin"
> +
> +#define FW_CHIP_ID_OFFSET 0
> +#define FW_VERSION_OFFSET 2
> +#define EDID_I2C_ADDR 0x50
> +
> +#define WRITE_STATUS_REG_CMD 0x01
> +#define READ_STATUS_REG_CMD 0x05
> +#define BUSY BIT(0)
> +#define CLEAR_ALL_PROTECT 0x00
> +#define BLK_PROTECT_BITS 0x0c
> +#define STATUS_REG_PROTECT BIT(7)
> +#define WRITE_ENABLE_CMD 0x06
> +#define CHIP_ERASE_CMD 0xc7
> +
> +#define bridge_to_ps8640(e) container_of(e, struct ps8640, bridge)
> +#define connector_to_ps8640(e) container_of(e, struct ps8640, connector)
> +
> +struct ps8640_info {
> + u8 family_id;
> + u8 variant_id;
> + u16 version;
> +};
> +
> +struct ps8640 {
> + struct drm_connector connector;
> + struct drm_bridge bridge;
> + struct edid *edid;
> + struct mipi_dsi_device dsi;
> + struct i2c_client *page[8];
> + struct i2c_client *ddc_i2c;
> + struct regulator_bulk_data supplies[2];
> + struct drm_panel *panel;
> + struct gpio_desc *gpio_rst_n;
> + struct gpio_desc *gpio_slp_n;
> + struct gpio_desc *gpio_mode_sel_n;
> + bool enabled;
> +
> + /* firmware file info */
> + bool in_fw_update;
> + struct ps8640_info info;
> +};
> +
> +static const u8 enc_ctrl_code[6] = {0xaa, 0x55, 0x50, 0x41, 0x52, 0x44};
> +static const u8 hw_chip_id[4] = {0x00, 0x0a, 0x00, 0x30};
> +
> +static int ps8640_read(struct i2c_client *client, u8 reg, u8 *data,
> + u16 data_len)
> +{
> + int ret;
> + struct i2c_msg msgs[] = {
> + {
> + .addr = client->addr,
> + .flags = 0,
> + .len = 1,
> + .buf = &reg,
> + },
> + {
> + .addr = client->addr,
> + .flags = I2C_M_RD,
> + .len = data_len,
> + .buf = data,
> + }
> + };
> +
> + ret = i2c_transfer(client->adapter, msgs, 2);
> +
> + if (ret == 2)
> + return 0;
> + if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
> +
> +static int ps8640_write_bytes(struct i2c_client *client, u8 *data,

Can you make this:
const u8 * data

> + u16 data_len)
> +{
> + int ret;
> + struct i2c_msg msg;
> +
> + msg.addr = client->addr;
> + msg.flags = 0;
> + msg.len = data_len;
> + msg.buf = data;
> +
> + ret = i2c_transfer(client->adapter, &msg, 1);
> + if (ret == 1)
> + return 0;
> + if (ret < 0)
> + return ret;
> + else
> + return -EIO;
> +}
> +
> +static int ps8640_write_byte(struct i2c_client *client, u8 reg, u8 data)
> +{
> + u8 buf[] = {reg, data};
> +
> + return ps8640_write_bytes(client, buf, sizeof(buf));
> +}
> +
> +static void ps8640_get_mcu_fw_version(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[5];
> + u8 fw_ver[2];
> +
> + ps8640_read(client, 0x4, fw_ver, 2);
> + ps_bridge->info.version = (fw_ver[0] << 8) | fw_ver[1];
> +
> + DRM_INFO_ONCE("ps8640 rom fw version %d.%d\n", fw_ver[0], fw_ver[1]);
> +}
> +
> +static int ps8640_bridge_enable(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[3];
> + u8 vdo_ctrl_buf[3] = {PAGE3_SET_ADD, VDO_CTL_ADD, VDO_EN};
> +
> + return ps8640_write_bytes(client, vdo_ctrl_buf, 3);
> +}
> +
> +static int ps8640_bridge_disable(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[3];
> + u8 vdo_ctrl_buf[3] = {PAGE3_SET_ADD, VDO_CTL_ADD, VDO_DIS};
> +
> + return ps8640_write_bytes(client, vdo_ctrl_buf, 3);
> +}
> +
> +static void ps8640_pre_enable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct i2c_client *client = ps_bridge->page[2];
> + int err;
> + u8 set_vdo_done;
> + ktime_t timeout;
> +
> + if (ps_bridge->in_fw_update)
> + return;
> +
> + if (ps_bridge->enabled)
> + return;
> +
> + err = drm_panel_prepare(ps_bridge->panel);
> + if (err < 0) {
> + DRM_ERROR("failed to prepare panel: %d\n", err);
> + return;
> + }
> +
> + err = regulator_bulk_enable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (err < 0) {
> + DRM_ERROR("cannot enable regulators %d\n", err);
> + goto err_panel_unprepare;
> + }
> +
> + gpiod_set_value(ps_bridge->gpio_slp_n, 1);
> + gpiod_set_value(ps_bridge->gpio_rst_n, 0);
> + usleep_range(2000, 2500);
> + gpiod_set_value(ps_bridge->gpio_rst_n, 1);
> +
> + /*
> + * Wait for the ps8640 embed mcu ready
> + * First wait 200ms and then check the mcu ready flag every 20ms
> + */
> + msleep(200);
> +
> + timeout = ktime_add_ms(ktime_get(), 200);
> + for (;;) {
> + err = ps8640_read(client, PAGE2_GPIO_H, &set_vdo_done, 1);
> + if (err < 0) {
> + DRM_ERROR("failed read PAGE2_GPIO_H: %d\n", err);
> + goto err_regulators_disable;
> + }
> + if ((set_vdo_done & PS_GPIO9) == PS_GPIO9)
> + break;
> + if (ktime_compare(ktime_get(), timeout) > 0)
> + break;
> + msleep(20);
> + }
> +
> + if (ps_bridge->info.version == 0)
> + ps8640_get_mcu_fw_version(ps_bridge);
> + /* Switch access edp panel's edid through i2c */
> + ps8640_write_byte(client, PAGE2_I2C_BYPASS, I2C_BYPASS_EN);
> + ps_bridge->enabled = true;
> +
> + return;
> +
> +err_regulators_disable:
> + regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> +err_panel_unprepare:
> + drm_panel_unprepare(ps_bridge->panel);
> +}
> +
> +static void ps8640_enable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + int err;
> +
> + err = ps8640_bridge_enable(ps_bridge);
> + if (err)
> + DRM_ERROR("failed to enable unmutevideo: %d\n", err);
> +
> + err = drm_panel_enable(ps_bridge->panel);
> + if (err < 0)
> + DRM_ERROR("failed to enable panel: %d\n", err);
> +}
> +
> +static void ps8640_disable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + int err;
> +
> + err = drm_panel_disable(ps_bridge->panel);
> + if (err < 0)
> + DRM_ERROR("failed to disable panel: %d\n", err);
> +
> + err = ps8640_bridge_disable(ps_bridge);
> + if (err < 0)
> + DRM_ERROR("failed to disable bridge: %d\n", err);
> +}
> +
> +static void ps8640_post_disable(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + int err;
> +
> + if (ps_bridge->in_fw_update)
> + return;
> +
> + if (!ps_bridge->enabled)
> + return;
> +
> + ps_bridge->enabled = false;
> +
> + gpiod_set_value(ps_bridge->gpio_rst_n, 0);
> + gpiod_set_value(ps_bridge->gpio_slp_n, 0);
> + err = regulator_bulk_disable(ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (err < 0)
> + DRM_ERROR("cannot disable regulators %d\n", err);
> +
> + err = drm_panel_unprepare(ps_bridge->panel);
> + if (err)
> + DRM_ERROR("failed to unprepare panel: %d\n", err);
> +}
> +
> +static int ps8640_get_modes(struct drm_connector *connector)
> +{
> + struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + u8 *edid;
> + int ret, num_modes = 0;
> + bool power_off;
> +
> + if (ps_bridge->edid)
> + return drm_add_edid_modes(connector, ps_bridge->edid);
> +
> + power_off = !ps_bridge->enabled;
> + ps8640_pre_enable(&ps_bridge->bridge);
> +
> + edid = devm_kmalloc(dev, EDID_LENGTH, GFP_KERNEL);
> + if (!edid) {
> + DRM_ERROR("Failed to allocate EDID\n");
> + return 0;
> + }
> +
> + ret = ps8640_read(ps_bridge->ddc_i2c, 0, edid, EDID_LENGTH);
> + if (ret)
> + goto out;
> +
> + ps_bridge->edid = (struct edid *)edid;
> + drm_mode_connector_update_edid_property(connector, ps_bridge->edid);
> +
> + num_modes = drm_add_edid_modes(connector, ps_bridge->edid);
> +
> +out:
> + if (power_off)
> + ps8640_post_disable(&ps_bridge->bridge);
> +
> + return num_modes;
> +}
> +
> +static struct drm_encoder *ps8640_best_encoder(struct drm_connector *connector)
> +{
> + struct ps8640 *ps_bridge = connector_to_ps8640(connector);
> +
> + return ps_bridge->bridge.encoder;
> +}
> +
> +static const struct drm_connector_helper_funcs ps8640_connector_helper_funcs = {
> + .get_modes = ps8640_get_modes,
> + .best_encoder = ps8640_best_encoder,
> +};
> +
> +static enum drm_connector_status ps8640_detect(struct drm_connector *connector,
> + bool force)
> +{
> + return connector_status_connected;
> +}
> +
> +static void ps8640_connector_destroy(struct drm_connector *connector)
> +{
> + drm_connector_unregister(connector);
> + drm_connector_cleanup(connector);
> +}
> +
> +static const struct drm_connector_funcs ps8640_connector_funcs = {
> + .dpms = drm_atomic_helper_connector_dpms,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .detect = ps8640_detect,
> + .destroy = ps8640_connector_destroy,
> + .reset = drm_atomic_helper_connector_reset,
> + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> +};
> +
> +int ps8640_bridge_attach(struct drm_bridge *bridge)
> +{
> + struct ps8640 *ps_bridge = bridge_to_ps8640(bridge);
> + struct device *dev = &ps_bridge->page[0]->dev;
> + struct device_node *np = dev->of_node;
> + struct device_node *port, *in_ep;
> + struct device_node *dsi_node = NULL;
> + struct mipi_dsi_host *host = ps_bridge->dsi.host;
> + int ret;
> +
> + ret = drm_connector_init(bridge->dev, &ps_bridge->connector,
> + &ps8640_connector_funcs,
> + DRM_MODE_CONNECTOR_eDP);
> +
> + if (ret) {
> + DRM_ERROR("Failed to initialize connector with drm: %d\n", ret);
> + return ret;
> + }
> +
> + drm_connector_helper_add(&ps_bridge->connector,
> + &ps8640_connector_helper_funcs);
> + drm_connector_register(&ps_bridge->connector);
> +
> + ps_bridge->connector.dpms = DRM_MODE_DPMS_ON;
> + drm_mode_connector_attach_encoder(&ps_bridge->connector,
> + bridge->encoder);
> +
> + if (ps_bridge->panel)
> + drm_panel_attach(ps_bridge->panel, &ps_bridge->connector);
> +
> + /* port@0 is ps8640 dsi input port */
> + port = of_graph_get_port_by_id(np, 0);
> + if (port) {
> + in_ep = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (in_ep) {
> + dsi_node = of_graph_get_remote_port_parent(in_ep);
> + of_node_put(in_ep);
> + }
> + }
> + if (dsi_node) {
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + of_node_put(dsi_node);
> + if (!host) {
> + ret = -ENODEV;
> + goto err;
> + }
> + }
> +
> + ps_bridge->dsi.host = host;
> + ps_bridge->dsi.mode_flags = MIPI_DSI_MODE_VIDEO |
> + MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> + ps_bridge->dsi.format = MIPI_DSI_FMT_RGB888;
> + ps_bridge->dsi.lanes = 4;
> + ret = mipi_dsi_attach(&ps_bridge->dsi);
> + if (ret)
> + goto err;
> +
> + return 0;
> +err:
> + if (ps_bridge->panel)
> + drm_panel_detach(ps_bridge->panel);
> + drm_connector_unregister(&ps_bridge->connector);
> + drm_connector_cleanup(&ps_bridge->connector);
> + return ret;
> +}
> +
> +static const struct drm_bridge_funcs ps8640_bridge_funcs = {
> + .attach = ps8640_bridge_attach,
> + .disable = ps8640_disable,
> + .post_disable = ps8640_post_disable,
> + .pre_enable = ps8640_pre_enable,
> + .enable = ps8640_enable,
> +};
> +
> +/* Firmware Version is returned as Major.Minor.Build */
> +static ssize_t ps8640_fw_version_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct ps8640 *ps_bridge = dev_get_drvdata(dev);
> + struct ps8640_info *info = &ps_bridge->info;
> +
> + return scnprintf(buf, PAGE_SIZE, "%u.%u\n", info->version >> 8,
> + info->version & 0xff);
> +}
> +
> +/* Hardware Version is returned as FamilyID.VariantID */
> +static ssize_t ps8640_hw_version_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct ps8640 *ps_bridge = dev_get_drvdata(dev);
> + struct ps8640_info *info = &ps_bridge->info;
> +
> + return scnprintf(buf, PAGE_SIZE, "ps%u.%u\n", info->family_id,
> + info->variant_id);
> +}
> +
> +static int ps8640_spi_send_cmd(struct ps8640 *ps_bridge, u8 *cmd, u8 cmd_len)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 i, buf[3];
> + int ret;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + if (ret)
> + goto err;
> +
> + /* write command in write port */
> + for (i = 0; i < cmd_len; i++) {
> + ret = ps8640_write_byte(client, PAGE2_SWSPI_WDATA, cmd[i]);
> + if (ret) {
> + ps8640_write_byte(client, PAGE2_IROM_CTRL,
> + IROM_DISABLE);
> + goto err;

Make this goto err_irom_disable, add a new label at the end of the
function, and move the IROM_DISABLE after it:

err_irom_disable:
ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);

> + }
> + }
> +
> + buf[0] = PAGE2_SWSPI_LEN;
> + buf[1] = cmd_len - 1;
> + buf[2] = TRIGGER_NO_READBACK;

nit: just initialize the buf array above.

> + ret = ps8640_write_bytes(client, buf, 3);
> + if (ret) {
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> + goto err;
> + }
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> + if (ret)
> + goto err;
> +
> + return 0;
> +
> +err:
> + dev_err(&client->dev, "send command err: %d\n", ret);
> + return ret;
> +}
> +
> +static int ps8640_wait_spi_ready(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 spi_rdy_st;
> + ktime_t timeout;
> +
> + timeout = ktime_add_ms(ktime_get(), 200);
> + for (;;) {
> + ps8640_read(client, PAGE2_SPI_STATUS, &spi_rdy_st, 1);
> + if ((spi_rdy_st & 0x0c) != 0x0c)
> + break;
> +
> + if (ktime_compare(ktime_get(), timeout) > 0) {
> + dev_err(&client->dev, "wait spi ready timeout\n");
> + return -EBUSY;
> + }
> +
> + msleep(20);
> + }
> +
> + return 0;
> +}
> +
> +static int ps8640_wait_spi_nobusy(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + u8 spi_status, buf[3];
> + int ret;
> + ktime_t timeout;
> +
> + timeout = ktime_add_ms(ktime_get(), 500);
> + for (;;) {
> + /* 0x05 RDSR; Read-Status-Register */
> + ret = ps8640_write_byte(client, PAGE2_SWSPI_WDATA,
> + READ_STATUS_REG_CMD);
> + if (ret)
> + goto err_send_cmd_exit;
> +
> + buf[0] = PAGE2_SWSPI_LEN;
> + buf[1] = 0;
> + buf[2] = TRIGGER_READBACK;

Initialize buf above.

> + ret = ps8640_write_bytes(client, buf, 3);
> + if (ret)
> + goto err_send_cmd_exit;
> +
> + /* delay for cmd send */
> + usleep_range(300, 500);
> + /* wait for SPI ROM until not busy */
> + ret = ps8640_read(client, PAGE2_SWSPI_RDATA, &spi_status, 1);
> + if (ret)
> + goto err_send_cmd_exit;
> +
> + if (!(spi_status & BUSY))
> + break;
> +
> + if (ktime_compare(ktime_get(), timeout) > 0) {
> + dev_err(&client->dev, "wait spi no busy timeout: %d\n",
> + ret);
> + return -EBUSY;
> + }
> + }
> +
> + return 0;
> +
> +err_send_cmd_exit:
> + dev_err(&client->dev, "send command err: %d\n", ret);
> + return ret;
> +}
> +
> +static int ps8640_wait_rom_idle(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + int ret;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_wait_spi_ready(ps_bridge);
> + if (ret)
> + goto err_spi;
> +
> + ret = ps8640_wait_spi_nobusy(ps_bridge);
> + if (ret)
> + goto err_spi;
> +
> + ret = ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> + if (ret)
> + goto exit;
> +
> + return 0;
> +
> +err_spi:
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> +exit:
> + if (ret)
> + dev_err(&client->dev, "wait ps8640 rom idle fail: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int ps8640_spi_dl_mode(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + int ret;
> +
> + /* switch ps8640 mode to spi dl mode */
> + gpiod_set_value(ps_bridge->gpio_mode_sel_n, 0);
> +
> + /* reset spi interface */
> + ret = ps8640_write_byte(client, PAGE2_SW_REST,
> + SPI_SW_RESET | MPU_SW_RESET);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_write_byte(client, PAGE2_SW_REST, MPU_SW_RESET);
> + if (ret)
> + goto exit;
> +
> +exit:
> + if (ret)
> + dev_err(&client->dev, "fail reset spi interface: %d\n", ret);
> +
> + return ret;
> +}
> +
> +static int ps8640_rom_prepare(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[2];
> + struct device *dev = &client->dev;
> + u8 i, cmd[2];
> + int ret;
> +
> + cmd[0] = WRITE_ENABLE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "failed enable-write-status-register: %d\n", ret);
> + return ret;
> + }
> +
> + cmd[0] = WRITE_STATUS_REG_CMD;
> + cmd[1] = CLEAR_ALL_PROTECT;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 2);
> + if (ret) {
> + dev_err(dev, "fail disable all protection: %d\n", ret);
> + return ret;
> + }
> +
> + /* wait for SPI module ready */
> + ret = ps8640_wait_rom_idle(ps_bridge);
> + if (ret) {
> + dev_err(dev, "fail wait rom idle: %d\n", ret);
> + return ret;
> + }
> +
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_ENABLE);
> + for (i = 0; i < 6; i++)
> + ps8640_write_byte(client, PAGE2_ENCTLSPI_WR, enc_ctrl_code[i]);
> + ps8640_write_byte(client, PAGE2_IROM_CTRL, IROM_DISABLE);
> +
> + /* Enable-Write-Status-Register */
> + cmd[0] = WRITE_ENABLE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "fail enable-write-status-register: %d\n", ret);
> + return ret;
> + }
> +
> + /* chip erase command */
> + cmd[0] = CHIP_ERASE_CMD;
> + ret = ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> + if (ret) {
> + dev_err(dev, "fail disable all protection: %d\n", ret);
> + return ret;
> + }
> +
> + ret = ps8640_wait_rom_idle(ps_bridge);
> + if (ret) {
> + dev_err(dev, "fail wait rom idle: %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int ps8640_check_chip_id(struct ps8640 *ps_bridge)
> +{
> + struct i2c_client *client = ps_bridge->page[4];
> + u8 buf[4];
> +
> + ps8640_read(client, PAGE4_REV_L, buf, 4);
> + return memcmp(buf, hw_chip_id, sizeof(buf));
> +}
> +
> +static int ps8640_validate_firmware(struct ps8640 *ps_bridge,
> + const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + u16 fw_chip_id;
> +
> + /*
> + * Get the chip_id from the firmware. Make sure that it is the
> + * right controller to do the firmware and config update.
> + */
> + fw_chip_id = get_unaligned_le16(fw->data + FW_CHIP_ID_OFFSET);
> +
> + if (fw_chip_id != 0x8640 && ps8640_check_chip_id(ps_bridge) == 0) {
> + dev_err(&client->dev,
> + "chip id mismatch: fw 0x%x vs. chip 0x8640\n",
> + fw_chip_id);
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int ps8640_write_rom(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + struct device *dev = &client->dev;
> + struct i2c_client *client2 = ps_bridge->page[2];
> + struct i2c_client *client7 = ps_bridge->page[7];
> + unsigned int pos = 0;
> + u8 buf[257], rom_page_id_buf[3];
> + int ret;
> + u16 cpy_len;
> +
> + ps8640_write_byte(client2, PAGE2_SPI_CFG3, I2C_TO_SPI_RESET);
> + msleep(100);
> + ps8640_write_byte(client2, PAGE2_SPI_CFG3, 0x00);
> +
> + for (pos = 0; pos < fw->size; pos += cpy_len) {
> + rom_page_id_buf[0] = PAGE2_ROMADD_BYTE1;
> + rom_page_id_buf[1] = pos >> 8;
> + rom_page_id_buf[2] = pos >> 16;
> + ret = ps8640_write_bytes(client2, rom_page_id_buf, 3);
> + if (ret)
> + goto error;
> + cpy_len = fw->size >= 256 + pos ? 256 : fw->size - pos;
> + buf[0] = 0;
> + memcpy(buf + 1, fw->data + pos, cpy_len);
> + ret = ps8640_write_bytes(client7, buf, cpy_len + 1);
> + if (ret)
> + goto error;
> +
> + dev_dbg(dev, "fw update completed %u / %zu bytes\n", pos,
> + fw->size);
> + }
> + return 0;
> +
> +error:
> + dev_err(dev, "failed write extenal flash, %d\n", ret);
> + return ret;
> +}
> +
> +static int ps8640_spi_normal_mode(struct ps8640 *ps_bridge)
> +{
> + u8 cmd[2];
> + struct i2c_client *client = ps_bridge->page[2];
> +
> + /* Enable-Write-Status-Register */
> + cmd[0] = WRITE_ENABLE_CMD;
> + ps8640_spi_send_cmd(ps_bridge, cmd, 1);
> +
> + /* protect BPL/BP0/BP1 */
> + cmd[0] = WRITE_STATUS_REG_CMD;
> + cmd[1] = BLK_PROTECT_BITS | STATUS_REG_PROTECT;
> + ps8640_spi_send_cmd(ps_bridge, cmd, 2);
> +
> + /* wait for SPI rom ready */
> + ps8640_wait_rom_idle(ps_bridge);
> +
> + /* disable PS8640 mapping function */
> + ps8640_write_byte(client, PAGE2_ENCTLSPI_WR, 0x00);
> +
> + gpiod_set_value(ps_bridge->gpio_mode_sel_n, 1);
> + return 0;
> +}
> +
> +static int ps8640_enter_bl(struct ps8640 *ps_bridge)
> +{
> + ps_bridge->in_fw_update = true;
> + return ps8640_spi_dl_mode(ps_bridge);
> +}
> +
> +static void ps8640_exit_bl(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + ps8640_spi_normal_mode(ps_bridge);
> + ps_bridge->in_fw_update = false;
> +}
> +
> +static int ps8640_load_fw(struct ps8640 *ps_bridge, const struct firmware *fw)
> +{
> + struct i2c_client *client = ps_bridge->page[0];
> + struct device *dev = &client->dev;
> + int ret;
> + bool ps8640_status_backup = ps_bridge->enabled;
> +
> + ret = ps8640_validate_firmware(ps_bridge, fw);
> + if (ret)
> + return ret;
> +
> + if (!ps_bridge->in_fw_update) {
> + if (!ps8640_status_backup)
> + ps8640_pre_enable(&ps_bridge->bridge);
> +
> + ret = ps8640_enter_bl(ps_bridge);
> + if (ret)
> + goto exit;
> + }
> +
> + ret = ps8640_rom_prepare(ps_bridge);
> + if (ret)
> + goto exit;
> +
> + ret = ps8640_write_rom(ps_bridge, fw);
> +
> +exit:
> + if (ret)
> + dev_err(dev, "Failed to load firmware, %d\n", ret);
> +
> + ps8640_exit_bl(ps_bridge, fw);
> + if (!ps8640_status_backup)
> + ps8640_post_disable(&ps_bridge->bridge);
> + return ret;
> +}
> +
> +static ssize_t ps8640_update_fw_store(struct device *dev,
> + struct device_attribute *attr,
> + const char *buf, size_t count)
> +{
> + struct i2c_client *client = to_i2c_client(dev);
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> + const struct firmware *fw;
> + int error;
> +
> + error = request_firmware(&fw, PS_FW_NAME, dev);
> + if (error) {
> + dev_err(dev, "Unable to open firmware %s: %d\n",
> + PS_FW_NAME, error);
> + return error;
> + }
> +
> + error = ps8640_load_fw(ps_bridge, fw);
> + if (error)
> + dev_err(dev, "The firmware update failed(%d)\n", error);
> + else
> + dev_info(dev, "The firmware update succeeded\n");
> +
> + release_firmware(fw);
> + return error ? error : count;
> +}
> +
> +static DEVICE_ATTR(fw_version, S_IRUGO, ps8640_fw_version_show, NULL);
> +static DEVICE_ATTR(hw_version, S_IRUGO, ps8640_hw_version_show, NULL);
> +static DEVICE_ATTR(update_fw, S_IWUSR, NULL, ps8640_update_fw_store);
> +
> +static struct attribute *ps8640_attrs[] = {
> + &dev_attr_fw_version.attr,
> + &dev_attr_hw_version.attr,
> + &dev_attr_update_fw.attr,
> + NULL
> +};
> +
> +static const struct attribute_group ps8640_attr_group = {
> + .attrs = ps8640_attrs,
> +};
> +
> +static void ps8640_remove_sysfs_group(void *data)
> +{
> + struct ps8640 *ps_bridge = data;
> +
> + sysfs_remove_group(&ps_bridge->page[0]->dev.kobj, &ps8640_attr_group);
> +}
> +
> +static int ps8640_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct ps8640 *ps_bridge;
> + struct device_node *np = dev->of_node;
> + struct device_node *port, *out_ep;
> + struct device_node *panel_node = NULL;
> + int i, ret;
> +
> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> + if (!ps_bridge)
> + return -ENOMEM;
> +
> + /* port@1 is ps8640 output port */
> + port = of_graph_get_port_by_id(np, 1);
> + if (port) {
> + out_ep = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (out_ep) {
> + panel_node = of_graph_get_remote_port_parent(out_ep);
> + of_node_put(out_ep);
> + }
> + }
> + if (panel_node) {
> + ps_bridge->panel = of_drm_find_panel(panel_node);
> + of_node_put(panel_node);
> + if (!ps_bridge->panel)
> + return -EPROBE_DEFER;
> + }
> +
> + ps_bridge->supplies[0].supply = "vdd33";
> + ps_bridge->supplies[1].supply = "vdd12";
> + ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ps_bridge->supplies),
> + ps_bridge->supplies);
> + if (ret) {
> + dev_info(dev, "failed to get regulators: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
> + dev_err(dev, "cannot get mode-sel %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_slp_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_slp_n);
> + dev_err(dev, "cannot get sleep: %d\n", ret);
> + return ret;
> + }
> +
> + /*
> + * Request the reset pin low to avoid the bridge being
> + * initialized prematurely
> + */
> + ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(ps_bridge->gpio_rst_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_rst_n);
> + dev_err(dev, "cannot get reset: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> + ps_bridge->bridge.of_node = dev->of_node;
> + ret = drm_bridge_add(&ps_bridge->bridge);
> + if (ret) {
> + dev_err(dev, "Failed to add bridge: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->page[0] = client;
> + ps_bridge->ddc_i2c = i2c_new_dummy(client->adapter, EDID_I2C_ADDR);
> + if (!ps_bridge->ddc_i2c) {
> + dev_err(dev, "failed ddc_i2c dummy device, address%02x\n",
> + EDID_I2C_ADDR);
> + ret = -EBUSY;
> + goto exit_ddc_i2c_dummy;
> + }
> + /*
> + * ps8640 uses multiple addresses, use dummy devices for them
> + * page[0]: for DP control
> + * page[1]: for VIDEO Bridge
> + * page[2]: for control top
> + * page[3]: for DSI Link Control1
> + * page[4]: for MIPI Phy
> + * page[5]: for VPLL
> + * page[6]: for DSI Link Control2
> + * page[7]: for spi rom mapping
> + */
> + for (i = 1; i < 8; i++) {
> + ps_bridge->page[i] = i2c_new_dummy(client->adapter,
> + client->addr + i);
> + if (!ps_bridge->page[i]) {
> + dev_err(dev, "failed i2c dummy device, address%02x\n",
> + client->addr + i);
> + ret = -EBUSY;
> + goto exit_dummy;
> + }
> + }
> + i2c_set_clientdata(client, ps_bridge);
> +
> + ret = sysfs_create_group(&client->dev.kobj, &ps8640_attr_group);
> + if (ret) {
> + dev_err(dev, "failed to create sysfs entries: %d\n", ret);
> + goto exit_dummy;
> + }
> +
> + ret = devm_add_action(dev, ps8640_remove_sysfs_group, ps_bridge);
> + if (ret) {
> + dev_err(dev, "failed to add sysfs cleanup action: %d\n", ret);
> + goto exit_remove_sysfs;
> + }
> + return 0;
> +
> +exit_remove_sysfs:
> + sysfs_remove_group(&ps_bridge->page[0]->dev.kobj, &ps8640_attr_group);
> +exit_dummy:
> + for (i = 1; i < 8; i++)
> + if (ps_bridge->page[i])
> + i2c_unregister_device(ps_bridge->page[i]);
> + i2c_unregister_device(ps_bridge->ddc_i2c);
> +exit_ddc_i2c_dummy:
> + drm_bridge_remove(&ps_bridge->bridge);
> + return ret;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> + int i;
> +
> + for (i = 1; i < 8; i++)
> + i2c_unregister_device(ps_bridge->page[i]);
> +
> + i2c_unregister_device(ps_bridge->ddc_i2c);
> + drm_bridge_remove(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id ps8640_i2c_table[] = {
> + {"parade,ps8640", 0},
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, ps8640_i2c_table);
> +
> +static const struct of_device_id ps8640_match[] = {
> + { .compatible = "parade,ps8640" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> + .id_table = ps8640_i2c_table,
> + .probe = ps8640_probe,
> + .remove = ps8640_remove,
> + .driver = {
> + .name = "parade,ps8640",
> + .of_match_table = ps8640_match,
> + },
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <jitao.shi@xxxxxxxxxxxx>");
> +MODULE_AUTHOR("CK Hu <ck.hu@xxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.9.5
>
>
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