On Wed, Sep 03, 2025 at 05:38:25AM -0700, syyang wrote:
> The following changes are included:
>
> - Updated Kconfig and Makefile to include the new driver
> - Implementation of the bridge driver at
> drivers/gpu/drm/bridge/lontium-lt9611c.c
This is really not interesting, it can be seen from the patch itself.
Please read Documentation/process/submitting-patches.rst.
Is it possible to toggle infoframes?
Is there YUV 444 / 422 output support? YUV420? Interlaced?
>
> Signed-off-by: syyang <syy...@lontium.com>
> ---
> drivers/gpu/drm/bridge/Kconfig | 16 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/lontium-lt9611c.c | 1496 ++++++++++++++++++++++
> 3 files changed, 1513 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/lontium-lt9611c.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index b9e0ca85226a..f0df146ed2ce 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -170,6 +170,22 @@ config DRM_LONTIUM_LT9611
> HDMI signals
> Please say Y if you have such hardware.
>
> +config DRM_LONTIUM_LT9611C
> + tristate "Lontium LT9611C DSI/HDMI bridge"
> + select SND_SOC_HDMI_CODEC if SND_SOC
> + depends on OF
> + select DRM_PANEL_BRIDGE
> + select DRM_KMS_HELPER
> + select DRM_MIPI_DSI
> + select DRM_DISPLAY_HELPER
> + select DRM_DISPLAY_HDMI_STATE_HELPER
You are not using the HDMI_STATE_HELPER, are you?
> + select REGMAP_I2C
> + help
> + Driver for Lontium LT9611C 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_LONTIUM_LT9611UXC
> tristate "Lontium LT9611UXC DSI/HDMI bridge"
> select SND_SOC_HDMI_CODEC if SND_SOC
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index 245e8a27e3fc..ccfa9987aa4f 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -15,6 +15,7 @@ obj-$(CONFIG_DRM_ITE_IT6505) += ite-it6505.o
> obj-$(CONFIG_DRM_LONTIUM_LT8912B) += lontium-lt8912b.o
> obj-$(CONFIG_DRM_LONTIUM_LT9211) += lontium-lt9211.o
> obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
> +obj-$(CONFIG_DRM_LONTIUM_LT9611C) += lontium-lt9611c.o
> obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
> obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
> obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) +=
> megachips-stdpxxxx-ge-b850v3-fw.o
> diff --git a/drivers/gpu/drm/bridge/lontium-lt9611c.c
> b/drivers/gpu/drm/bridge/lontium-lt9611c.c
> new file mode 100644
> index 000000000000..c4d680362583
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/lontium-lt9611c.c
> @@ -0,0 +1,1496 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright 2025 LONTIUM
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms of the GNU General Public License 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.
Drop the licence text, you have SPDX header for it.
> + */
> +#include <linux/firmware.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of_graph.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <drm/drm_modes.h>
> +#include <sound/hdmi-codec.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_bridge.h>
> +#include <drm/drm_edid.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> +#include <drm/drm_print.h>
> +#include <drm/drm_probe_helper.h>
> +#include <linux/pm_runtime.h>
Sort the headers
> +
> +#define FW_SIZE (64 * 1024)
> +#define LT_PAGE_SIZE 256
> +#define FW_FILE "LT9611C.bin"
Please land this firmware to the linux-firmware repository.
> +#define NOT_UPGRADE 0
> +#define UPGRADE 1
You know, C99 has 'bool' type.
> +
> +struct lt9611c {
> + struct device *dev;
> + struct i2c_client *client;
> + struct drm_bridge bridge;
> + struct drm_bridge *next_bridge;
> + struct regmap *regmap;
> + /* Protects all accesses to registers by stopping the on-chip MCU */
> + struct mutex ocm_lock;
> + struct work_struct work;
> + struct device_node *dsi0_node;
> + struct device_node *dsi1_node;
> + struct mipi_dsi_device *dsi0;
> + struct mipi_dsi_device *dsi1;
> + struct platform_device *audio_pdev;
> + struct gpio_desc *reset_gpio;
> + struct regulator_bulk_data supplies[2];
> + struct device *codec_dev;
> + struct task_struct *kthread;
> + struct task_struct *test_kthread;
> + hdmi_codec_plugged_cb plugged_cb;
> + const struct firmware *fw;
> + u64 fw_version;
> + u8 *edid_buf;
> + int edid_len;
> + bool edid_valid;
> + u8 fw_crc;
> +
> + bool work_inited;
> + bool bridge_added;
> + bool regulators_enabled;
> + bool hdmi_connected;
> + enum drm_connector_status audio_status;
> +};
> +
> +static const struct regmap_range chip_ranges[] = {
> + { .range_min = 0, .range_max = 0xff },
> +};
> +
> +static const struct regmap_access_table chip_table = {
> + .yes_ranges = chip_ranges,
> + .n_yes_ranges = ARRAY_SIZE(chip_ranges),
> +};
> +
> +static const struct regmap_config lt9611c_regmap_config = {
> + .reg_bits = 8,
It's 16
> + .val_bits = 8,
> + .volatile_table = &chip_table,
> + .cache_type = REGCACHE_NONE,
> +};
> +
> +struct crc_info {
> + u8 width;
> + u32 poly;
> + u32 crc_init;
> + u32 xor_out;
> + bool refin;
> + bool refout;
> +};
> +
> +static void lt9611c_audio_update_connector_status(struct lt9611c *lt9611c);
> +
> +static unsigned int bits_reverse(u32 in_val, u8 bits)
> +{
> + u32 out_val = 0;
> + u8 i;
> +
> + for (i = 0; i < bits; i++) {
> + if (in_val & (1 << i))
> + out_val |= 1 << (bits - 1 - i);
> + }
> +
> + return out_val;
> +}
> +
> +static unsigned int get_crc(struct crc_info type, const u8 *buf, u64 buf_len)
Use library functions for that.
> +{
> + u8 width = type.width;
> + u32 poly = type.poly;
> + u32 crc = type.crc_init;
> + u32 xorout = type.xor_out;
> + bool refin = type.refin;
> + bool refout = type.refout;
> + u8 n;
> + u32 bits;
> + u32 data;
> + u8 i;
> +
> + n = (width < 8) ? 0 : (width - 8);
> + crc = (width < 8) ? (crc << (8 - width)) : crc;
> + bits = (width < 8) ? 0x80 : (1 << (width - 1));
> + poly = (width < 8) ? (poly << (8 - width)) : poly;
> + while (buf_len--) {
> + data = *(buf++);
> + if (refin)
> + data = bits_reverse(data, 8);
> + crc ^= (data << n);
> + for (i = 0; i < 8; i++) {
> + if (crc & bits)
> + crc = (crc << 1) ^ poly;
> + else
> + crc = crc << 1;
> + }
> + }
> + crc = (width < 8) ? (crc >> (8 - width)) : crc;
> + if (refout)
> + crc = bits_reverse(crc, width);
> + crc ^= xorout;
> +
> + return (crc & ((2 << (width - 1)) - 1));
> +}
> +
> +static u8 calculate_crc(struct lt9611c *lt9611c)
> +{
> + struct crc_info type = {
> + .width = 8,
> + .poly = 0x31,
> + .crc_init = 0,
> + .xor_out = 0,
> + .refout = false,
> + .refin = false,
> + };
> + const u8 *upgrade_data;
> + u64 len;
> + u64 crc_size = FW_SIZE - 1;
> + u8 default_val = 0xFF;
> +
> + if (!lt9611c->fw || !lt9611c->fw->data || lt9611c->fw->size == 0) {
> + dev_err(lt9611c->dev, "firmware data not available for CRC\n");
> + return 0;
> + }
> +
> + upgrade_data = lt9611c->fw->data;
> + len = lt9611c->fw->size;
> +
> + type.crc_init = get_crc(type, upgrade_data, len);
> +
> + crc_size -= len;
> + while (crc_size--)
> + type.crc_init = get_crc(type, &default_val, 1);
> +
> + return type.crc_init;
> +}
> +
> +static int i2c_write_byte(struct lt9611c *lt9611c, u8 reg, u8 val)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret = 0;
> +
> + ret = regmap_write(lt9611c->regmap, reg, val);
> + if (ret < 0) {
> + dev_err(dev,
> + "regmap_write error: i2c addr=0x%02x, reg addr=0x%02x,
> error=%d",
> + lt9611c->client->addr, reg, ret);
> + }
> +
> + return ret;
> +}
> +
> +static int i2c_read_byte(struct lt9611c *lt9611c, u8 reg, u8 *val)
Drop these two wrappers, they provide no extra functionality.
> +{
> + struct device *dev = lt9611c->dev;
> + int ret = 0;
> + unsigned int tmp;
> +
> + if (!val)
> + return -EINVAL;
> +
> + ret = regmap_read(lt9611c->regmap, reg, &tmp);
> + if (ret < 0) {
> + dev_err(dev,
> + "regmap_read error: i2c addr=0x%02x, reg addr=0x%02x,
> error=%d",
> + lt9611c->client->addr, reg, ret);
> +
> + return ret;
> + }
> +
> + *val = (u8)tmp;
> +
> + return 0;
> +}
> +
> +static int i2c_read_write_flow(struct lt9611c *lt9611c, u8 *params,
> + unsigned int param_count, u8 *return_buffer,
> + unsigned int return_count)
> +{
> + int count, i;
> + u8 temp;
> +
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0xDE, 0x01);
- lowercase all hex values
- use paged writes as implemented for LT9611 and LT9611UXC
> +
> + count = 0;
> + do {
> + i2c_read_byte(lt9611c, 0xAE, &temp);
> + usleep_range(1000, 2000);
> + count++;
> + } while (count < 100 && temp != 0x01);
> +
> + if (temp != 0x01)
> + return -1;
> +
> + for (i = 0; i < param_count; i++) {
> + if (i > 0xDD - 0xB0)
> + break;
> +
> + i2c_write_byte(lt9611c, 0xB0 + i, params[i]);
> + }
> +
> + i2c_write_byte(lt9611c, 0xDE, 0x02);
> +
> + count = 0;
> + do {
> + i2c_read_byte(lt9611c, 0xAE, &temp);
> + usleep_range(1000, 2000);
> + count++;
> + } while (count < 100 && temp != 0x02);
> +
> + if (temp != 0x02)
> + return -2;
> +
> + for (i = 0; i < return_count; i++)
> + i2c_read_byte(lt9611c, 0x85 + i, &return_buffer[i]);
> +
> + return 0;
> +}
> +
> +static int lt9611c_prepare_firmware_data(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + /* ensure filesystem ready */
> + msleep(3000);
No. If the firmware is necessary and it's not ready, return
-EPROBE_DEFER.
> + ret = request_firmware(<9611c->fw, FW_FILE, dev);
> + if (ret) {
> + dev_err(dev, "failed load file '%s', error type %d\n", FW_FILE,
> ret);
> + return ret;
> + }
> +
> + if (lt9611c->fw->size > FW_SIZE - 1) {
> + dev_err(dev, "firmware too large (%zu > %d)\n",
> lt9611c->fw->size, FW_SIZE - 1);
> + lt9611c->fw = NULL;
> + return -EINVAL;
> + }
> +
> + dev_info(dev, "firmware size: %zu bytes\n", lt9611c->fw->size);
> +
> + lt9611c->fw_crc = calculate_crc(lt9611c);
> +
> + dev_info(dev, "LT9611C.bin crc: 0x%02X\n", lt9611c->fw_crc);
No spamming with the unnecessary info. If you want, print the version
of the firmware.
> +
> + return 0;
> +}
> +
> +static void lt9611c_config_parameters(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0xEE, 0x01);
> + //fifo_rst_n
> + i2c_write_byte(lt9611c, 0xFF, 0xE1);
> + i2c_write_byte(lt9611c, 0x03, 0x3F);
> + i2c_write_byte(lt9611c, 0x03, 0xFF);
> +
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0x5E, 0xC1);
> + i2c_write_byte(lt9611c, 0x58, 0x00);
> + i2c_write_byte(lt9611c, 0x59, 0x50);
> + i2c_write_byte(lt9611c, 0x5A, 0x10);
> + i2c_write_byte(lt9611c, 0x5A, 0x00);
> + i2c_write_byte(lt9611c, 0x58, 0x21);
> +}
> +
> +static void lt9611c_flash_to_fifo(struct lt9611c *lt9611c, u64 addr)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0x5e, 0x5f);
> + i2c_write_byte(lt9611c, 0x5a, 0x20);
> + i2c_write_byte(lt9611c, 0x5a, 0x00);
> + i2c_write_byte(lt9611c, 0x5b, ((addr & 0xFF0000) >> 16));
> + i2c_write_byte(lt9611c, 0x5c, ((addr & 0xFF00) >> 8));
> + i2c_write_byte(lt9611c, 0x5d, (addr & 0xFF));
> + i2c_write_byte(lt9611c, 0x5a, 0x10);
> + i2c_write_byte(lt9611c, 0x5a, 0x00);
> +}
> +
> +static void lt9611c_wren(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0x5a, 0x04);
> + i2c_write_byte(lt9611c, 0x5a, 0x00);
> +}
> +
> +static void lt9611c_wrdi(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0x5A, 0x08);
> + i2c_write_byte(lt9611c, 0x5A, 0x00);
> +}
> +
> +static int lt9611c_upgrade_judgment(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> + u8 flash_crc;
> +
> + if (!lt9611c)
> + return -EINVAL;
How can it be NULL here?
> +
> + lt9611c_config_parameters(lt9611c);
> + lt9611c_flash_to_fifo(lt9611c, FW_SIZE - 1);
> + i2c_write_byte(lt9611c, 0x58, 0x21);
> +
> + ret = i2c_read_byte(lt9611c, 0x5f, &flash_crc);
> + if (ret < 0) {
> + dev_err(dev, "failed to read flash crc\n");
> + return ret;
> + }
> +
> + dev_info(dev, "flash firmware crc=0x%02X, expected crc=0x%02X",
> + flash_crc, lt9611c->fw_crc);
dev_dbg()
> +
> + lt9611c_wrdi(lt9611c);
> +
> + return (flash_crc == lt9611c->fw_crc) ? NOT_UPGRADE : UPGRADE;
> +}
> +
> +static int read_flash_reg_status(struct lt9611c *lt9611c, u8 *status)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + //fifo_rst_n
> + i2c_write_byte(lt9611c, 0xFF, 0xE1);
> + i2c_write_byte(lt9611c, 0x03, 0x3F);
> + i2c_write_byte(lt9611c, 0x03, 0xFF);
> +
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0x5e, 0x40);
> + i2c_write_byte(lt9611c, 0x56, 0x05);
> + i2c_write_byte(lt9611c, 0x55, 0x25);
> + i2c_write_byte(lt9611c, 0x55, 0x01);
> + i2c_write_byte(lt9611c, 0x58, 0x21);
> +
> + ret = i2c_read_byte(lt9611c, 0x5f, status);
> + if (ret < 0)
> + dev_err(dev, "failed to read flash register status\n");
> +
> + return ret;
> +}
> +
> +static void lt9611c_block_erase(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + u32 i = 0;
> + u8 flash_status = 0;
> + u8 block_num = 0x00;
> + u32 flash_addr = 0x00;
> +
> + for (block_num = 0; block_num < 2; block_num++) {
> + flash_addr = (block_num * 0x008000);
> + i2c_write_byte(lt9611c, 0xFF, 0xE0);
> + i2c_write_byte(lt9611c, 0xEE, 0x01);
> + i2c_write_byte(lt9611c, 0x5A, 0x04);
> + i2c_write_byte(lt9611c, 0x5A, 0x00);
> + i2c_write_byte(lt9611c, 0x5B, flash_addr >> 16);
> + i2c_write_byte(lt9611c, 0x5C, flash_addr >> 8);
> + i2c_write_byte(lt9611c, 0x5D, flash_addr);
> + i2c_write_byte(lt9611c, 0x5A, 0x01);
> + i2c_write_byte(lt9611c, 0x5A, 0x00);
> + msleep(100);
> + i = 0;
> + while (1) {
> + read_flash_reg_status(lt9611c, &flash_status);
> + if ((flash_status & 0x01) == 0)
> + break;
> +
> + if (i > 50)
> + break;
> +
> + i++;
> + msleep(50);
> + }
> + }
> +
> + dev_info(dev, "erase flash done.\n");
> +}
> +
> +static void lt9611c_crc_to_sram(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0x51, 0x00);
> + i2c_write_byte(lt9611c, 0x55, 0xc0);
> + i2c_write_byte(lt9611c, 0x55, 0x80);
> + i2c_write_byte(lt9611c, 0x5e, 0xc0);
> + i2c_write_byte(lt9611c, 0x58, 0x21);
> +}
> +
> +static void lt9611c_data_to_sram(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0x51, 0xff);
> + i2c_write_byte(lt9611c, 0x55, 0x80);
> + i2c_write_byte(lt9611c, 0x5e, 0xc0);
> + i2c_write_byte(lt9611c, 0x58, 0x21);
> +}
> +
> +static void lt9611c_sram_to_flash(struct lt9611c *lt9611c, u64 addr)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0x5b, ((addr & 0xFF0000) >> 16));
> + i2c_write_byte(lt9611c, 0x5c, ((addr & 0xFF00) >> 8));
> + i2c_write_byte(lt9611c, 0x5d, (addr & 0xFF));
> + i2c_write_byte(lt9611c, 0x5A, 0x30);
> + i2c_write_byte(lt9611c, 0x5A, 0x00);
> +}
> +
> +static int lt9611c_write_data(struct lt9611c *lt9611c, u64 addr)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> + int page = 0, num = 0, i = 0;
> + const u8 *data;
> + u64 size, index;
> + u8 value;
> +
> + data = lt9611c->fw->data;
> + size = lt9611c->fw->size;
> +
> + page = (size + LT_PAGE_SIZE - 1) / LT_PAGE_SIZE;
> +
> + if (page * LT_PAGE_SIZE > 64 * 1024) {
> + dev_err(dev, "firmware size out of range\n");
> + return -EINVAL;
> + }
> +
> + dev_info(dev, "%u pages, total size %llu byte\n", page, size);
dev_dbg()
> +
> + for (num = 0; num < page; num++) {
> + lt9611c_data_to_sram(lt9611c);
> +
> + for (i = 0; i < LT_PAGE_SIZE; i++) {
> + index = num * LT_PAGE_SIZE + i;
> + value = (index < size) ? data[index] : 0xFF;
> +
> + ret = i2c_write_byte(lt9611c, 0x59, value);
> + if (ret < 0) {
> + dev_err(dev, "write error at page %u, index
> %u\n", num, i);
> + return ret;
> + }
> + }
> +
> + lt9611c_wren(lt9611c);
> + lt9611c_sram_to_flash(lt9611c, addr);
> +
> + addr += LT_PAGE_SIZE;
> + }
> +
> + lt9611c_wrdi(lt9611c);
> +
> + return 0;
> +}
> +
> +static int lt9611c_write_crc(struct lt9611c *lt9611c, u64 addr)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> + u8 crc;
> +
> + crc = lt9611c->fw_crc;
> + lt9611c_crc_to_sram(lt9611c);
> + ret = i2c_write_byte(lt9611c, 0x59, crc);
> + if (ret < 0) {
> + dev_err(dev, "failed to write CRC\n");
> + return -1;
> + }
> +
> + lt9611c_wren(lt9611c);
> + lt9611c_sram_to_flash(lt9611c, addr);
> + lt9611c_wrdi(lt9611c);
> +
> + dev_info(dev, "CRC 0x%02X written to flash at addr 0x%llX\n", crc,
> addr);
dev_dbg
> +
> + return 0;
> +}
> +
> +static int lt9611c_firmware_upgrade(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + dev_info(dev, "starting firmware upgrade, size: %zu bytes\n",
> lt9611c->fw->size);
dev_dbg
> +
> + lt9611c_config_parameters(lt9611c);
> + lt9611c_block_erase(lt9611c);
> +
> + ret = lt9611c_write_data(lt9611c, 0);
> + if (ret < 0) {
> + dev_err(dev, "Failed to write firmware data\n");
> + return ret;
> + }
> +
> + ret = lt9611c_write_crc(lt9611c, FW_SIZE - 1);
> + if (ret < 0) {
> + dev_err(dev, "Failed to write firmware CRC\n");
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int lt9611c_upgrade_result(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + u8 crc_result;
> +
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0xee, 0x01);
> + i2c_read_byte(lt9611c, 0x21, &crc_result);
> +
> + if (crc_result == lt9611c->fw_crc) {
> + dev_info(dev, "LT9611C firmware upgrade success, CRC=0x%02X\n",
> crc_result);
dev_dbg
> + return 0;
> + }
> +
> + dev_err(dev, "LT9611C firmware upgrade failed, expected CRC=0x%02X,
> read CRC=0x%02X\n",
> + lt9611c->fw_crc, crc_result);
> + return -EIO;
> +}
> +
> +static struct lt9611c *bridge_to_lt9611c(struct drm_bridge *bridge)
> +{
> + return container_of(bridge, struct lt9611c, bridge);
> +}
> +
> +static void lt9611c_lock(struct lt9611c *lt9611c)
> +{
> + mutex_lock(<9611c->ocm_lock);
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0xee, 0x01);
> +}
> +
> +static void lt9611c_unlock(struct lt9611c *lt9611c)
> +{
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0xee, 0x00);
> + mutex_unlock(<9611c->ocm_lock);
> +}
> +
> +static irqreturn_t lt9611c_irq_thread_handler(int irq, void *dev_id)
> +{
> + struct lt9611c *lt9611c = dev_id;
> + struct device *dev = lt9611c->dev;
> + int ret;
> + u8 irq_status;
> + u8 cmd[5] = {0x52, 0x48, 0x31, 0x3a, 0x00};
> + u8 data[5];
> +
> + mutex_lock(<9611c->ocm_lock);
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_read_byte(lt9611c, 0x84, &irq_status);
> +
> + if (!(irq_status & BIT(0))) {
> + mutex_unlock(<9611c->ocm_lock);
> + return IRQ_HANDLED;
> + }
> + dev_info(dev, "HPD interrupt triggered.\n");
Nice joke. dev_dbg().
> +
> + i2c_write_byte(lt9611c, 0xdf, irq_status & BIT(0));
> + usleep_range(10000, 12000);
Why?
> + i2c_write_byte(lt9611c, 0xdf, irq_status & (~BIT(0)));
> +
> + ret = i2c_read_write_flow(lt9611c, cmd, 5, data, 5);
> + if (ret) {
> + dev_err(dev, "failed to read HPD status\n");
> + } else {
> + lt9611c->hdmi_connected = (data[4] == 0x02);
> + dev_info(dev, "HDMI %s\n", lt9611c->hdmi_connected ?
> "connected" : "disconnected");
dev_dbg()
> + }
> +
> + lt9611c->audio_status = lt9611c->hdmi_connected ?
> + connector_status_connected :
> + connector_status_disconnected;
What is it being used for? Why do you need separate status for audio?
> +
> + schedule_work(<9611c->work);
> +
> + mutex_unlock(<9611c->ocm_lock);
> +
> + return IRQ_HANDLED;
> +}
> +
> +static void lt9611c_hpd_work(struct work_struct *work)
> +{
> + struct lt9611c *lt9611c = container_of(work, struct lt9611c, work);
> + bool connected;
> +
> + mutex_lock(<9611c->ocm_lock);
> + connected = lt9611c->hdmi_connected;
> + mutex_unlock(<9611c->ocm_lock);
> +
> + drm_bridge_hpd_notify(<9611c->bridge,
> + connected ?
> + connector_status_connected :
> + connector_status_disconnected);
Incorrect indentation.
> +
> + lt9611c_audio_update_connector_status(lt9611c);
> +}
> +
> +static void lt9611c_reset(struct lt9611c *lt9611c)
> +{
> + gpiod_set_value_cansleep(lt9611c->reset_gpio, 1);
> + msleep(20);
> + gpiod_set_value_cansleep(lt9611c->reset_gpio, 0);
> + msleep(20);
> + gpiod_set_value_cansleep(lt9611c->reset_gpio, 1);
> + msleep(400);
> +}
> +
> +static int lt9611c_regulator_init(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + lt9611c->supplies[0].supply = "vcc";
> + lt9611c->supplies[1].supply = "vdd";
> +
> + ret = devm_regulator_bulk_get(dev, 2, lt9611c->supplies);
> +
> + return ret;
> +}
> +
> +static int lt9611c_regulator_enable(struct lt9611c *lt9611c)
> +{
> + int ret;
> +
> + ret = regulator_enable(lt9611c->supplies[0].consumer);
> + if (ret < 0)
> + return ret;
> +
> + usleep_range(5000, 10000);
> +
> + ret = regulator_enable(lt9611c->supplies[1].consumer);
> + if (ret < 0) {
> + regulator_disable(lt9611c->supplies[0].consumer);
> + return ret;
> + }
> +
> + return ret;
> +}
> +
> +static int lt9611c_regulator_disable(struct lt9611c *lt9611c)
> +{
> + int ret;
> +
> + ret = regulator_disable(lt9611c->supplies[0].consumer);
> + if (ret < 0)
> + return ret;
> +
> + usleep_range(5000, 10000);
> +
> + ret = regulator_disable(lt9611c->supplies[1].consumer);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static struct mipi_dsi_device *lt9611c_attach_dsi(struct lt9611c *lt9611c,
> + struct device_node *dsi_node)
> +{
> + const struct mipi_dsi_device_info info = { "lt9611c", 0, NULL };
> + struct mipi_dsi_device *dsi;
> + struct mipi_dsi_host *host;
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + host = of_find_mipi_dsi_host_by_node(dsi_node);
> + if (!host)
> + return ERR_PTR(dev_err_probe(dev, -EPROBE_DEFER, "failed to
> find dsi host\n"));
> +
> + dsi = devm_mipi_dsi_device_register_full(dev, host, &info);
> + if (IS_ERR(dsi)) {
> + dev_err(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 = devm_mipi_dsi_attach(dev, dsi);
> + if (ret < 0) {
> + dev_err(dev, "failed to attach dsi to host\n");
> + return ERR_PTR(ret);
> + }
> +
> + return dsi;
> +}
> +
> +static int lt9611c_bridge_attach(struct drm_bridge *bridge,
> + struct drm_encoder *encoder,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge);
> +
> + return drm_bridge_attach(encoder, lt9611c->next_bridge,
> + bridge, flags);
> +}
> +
> +static enum drm_mode_status lt9611c_bridge_mode_valid(struct drm_bridge
> *bridge,
> + const struct
> drm_display_info *info,
> + const struct drm_display_mode *mode)
> +{
> + u32 pixclk;
> +
> + pixclk = (mode->htotal * mode->vtotal * drm_mode_vrefresh(mode)) /
> 1000000;
> +
> + if (pixclk >= 25 && pixclk <= 340)
Use .hdmi_tmds_char_rate_valid() for that.
> + return MODE_OK;
> + else
> + return MODE_BAD;
> +}
> +
> +static void lt9611c_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adj_mode)
- Wrong indentation
- mode_set callback is deprecated and should not be used for new
drivers.
> +{
> + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge);
> + struct device *dev = lt9611c->dev;
> + int ret;
> + u32 h_total, hactive, hsync_len, hfront_porch, hback_porch;
> + u32 v_total, vactive, vsync_len, vfront_porch, vback_porch;
> + u8 video_timing_set_cmd[26] = {0x57, 0x4D, 0x33, 0x3A};
> + u8 return_timing_set_param[3];
> + u8 framerate;
> + u8 vic = 0x00;
> +
> + hsync_len = mode->hsync_end - mode->hsync_start;
> + hfront_porch = mode->hsync_start - mode->hdisplay;
> + hback_porch = mode->htotal - mode->hsync_end;
> +
> + v_total = mode->vtotal;
> + vactive = mode->vdisplay;
> + vsync_len = mode->vsync_end - mode->vsync_start;
> + vfront_porch = mode->vsync_start - mode->vdisplay;
> + vback_porch = mode->vtotal - mode->vsync_end;
> + framerate = drm_mode_vrefresh(mode);
> + vic = drm_match_cea_mode(mode);
> +
> + dev_info(dev, "Out video info:\n");
> + dev_info(dev,
> + "h_total=%d, hactive=%d, hsync_len=%d, hfront_porch=%d,
> hback_porch=%d\n",
> + h_total, hactive, hsync_len, hfront_porch, hback_porch);
> + dev_info(dev,
> + "v_total=%d, vactive=%d, vsync_len=%d, vfront_porch=%d,
> vback_porch=%d\n",
> + v_total, vactive, vsync_len, vfront_porch, vback_porch);
Fix indentation
Use dev_dbg / drm_dbg_kms() all over the driver. Your code is too
spammy.
> +
> + dev_info(dev, "framerate=%d\n", framerate);
> + dev_info(dev, "vic = 0x%02X\n", vic);
> +
> + video_timing_set_cmd[4] = (h_total >> 8) & 0xFF;
> + video_timing_set_cmd[5] = h_total & 0xFF;
> + video_timing_set_cmd[6] = (hactive >> 8) & 0xFF;
> + video_timing_set_cmd[7] = hactive & 0xFF;
> + video_timing_set_cmd[8] = (hfront_porch >> 8) & 0xFF;
> + video_timing_set_cmd[9] = hfront_porch & 0xFF;
> + video_timing_set_cmd[10] = (hsync_len >> 8) & 0xFF;
> + video_timing_set_cmd[11] = hsync_len & 0xFF;
> + video_timing_set_cmd[12] = (hback_porch >> 8) & 0xFF;
> + video_timing_set_cmd[13] = hback_porch & 0xFF;
> + video_timing_set_cmd[14] = (v_total >> 8) & 0xFF;
> + video_timing_set_cmd[15] = v_total & 0xFF;
> + video_timing_set_cmd[16] = (vactive >> 8) & 0xFF;
> + video_timing_set_cmd[17] = vactive & 0xFF;
> + video_timing_set_cmd[18] = (vfront_porch >> 8) & 0xFF;
> + video_timing_set_cmd[19] = vfront_porch & 0xFF;
> + video_timing_set_cmd[20] = (vsync_len >> 8) & 0xFF;
> + video_timing_set_cmd[21] = vsync_len & 0xFF;
> + video_timing_set_cmd[22] = (vback_porch >> 8) & 0xFF;
> + video_timing_set_cmd[23] = vback_porch & 0xFF;
> + video_timing_set_cmd[24] = framerate;
> + video_timing_set_cmd[25] = vic;
> +
> + mutex_lock(<9611c->ocm_lock);
> + ret = i2c_read_write_flow(lt9611c, video_timing_set_cmd, 26,
> return_timing_set_param, 3);
> + if (ret)
> + dev_err(dev, "video set failed\n");
> + mutex_unlock(<9611c->ocm_lock);
> +}
> +
> +static enum drm_connector_status lt9611c_bridge_detect(struct drm_bridge
> *bridge,
> + struct drm_connector
> *connector)
> +{
> + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge);
> + struct device *dev = lt9611c->dev;
> + int ret;
> + bool connected = false;
> + u8 cmd[5] = {0x52, 0x48, 0x31, 0x3a, 0x00};
> + u8 data[5];
> +
> + mutex_lock(<9611c->ocm_lock);
> + ret = i2c_read_write_flow(lt9611c, cmd, 5, data, 5);
> + if (ret) {
> + dev_err(dev, "Failed to read HPD status, cannot determine HDMI
> connection (err=%d)\n",
> + ret);
> + } else {
> + connected = (data[4] == 0x02);
> + }
THere is no need to put single-line statements in brackets. Drop those.
> +
> + lt9611c->hdmi_connected = connected;
> +
> + if (lt9611c->hdmi_connected)
> + lt9611c->audio_status = connector_status_connected;
> + else
> + lt9611c->audio_status = connector_status_disconnected;
> +
> + mutex_unlock(<9611c->ocm_lock);
> +
> + return connected ? connector_status_connected :
> + connector_status_disconnected;
> +}
> +
> +static int lt9611c_read_edid(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret, i, bytes_to_copy, offset = 0;
> + u8 packets_num;
> + u8 read_edid_data_cmd[5] = {0x52, 0x48, 0x33, 0x3A, 0x00};
> + u8 return_edid_data[37];
> + u8 read_edid_byte_num_cmd[5] = {0x52, 0x48, 0x32, 0x3A, 0x00};
> + u8 return_edid_byte_num[6];
> +
> + ret = i2c_read_write_flow(lt9611c, read_edid_byte_num_cmd, 5,
> return_edid_byte_num, 6);
> + if (ret) {
> + dev_err(dev, "Failed to read EDID byte number\n");
> + lt9611c->edid_valid = false;
> + return ret;
> + }
> +
> + lt9611c->edid_len = (return_edid_byte_num[4] << 8) |
> return_edid_byte_num[5];
> +
> + if (!lt9611c->edid_buf || lt9611c->edid_len > (lt9611c->edid_valid ?
> + lt9611c->edid_len : 0)) {
> + kfree(lt9611c->edid_buf);
> + lt9611c->edid_buf = kzalloc(lt9611c->edid_len, GFP_KERNEL);
> + if (!lt9611c->edid_buf) {
> + dev_err(dev, "Failed to allocate EDID buffer\n");
> + lt9611c->edid_len = 0;
> + lt9611c->edid_valid = false;
> + return -ENOMEM;
> + }
> + }
> +
> + packets_num = (lt9611c->edid_len % 32) ? (lt9611c->edid_len / 32 + 1) :
> + (lt9611c->edid_len / 32);
> + for (i = 0; i < packets_num; i++) {
> + read_edid_data_cmd[4] = (u8)i;
> + ret = i2c_read_write_flow(lt9611c, read_edid_data_cmd, 5,
> return_edid_data, 37);
> + if (ret) {
> + dev_err(dev, "Failed to read EDID packet %d\n", i);
> + lt9611c->edid_valid = false;
> + return -EIO;
> + }
> + offset = i * 32;
> + bytes_to_copy = min(32, lt9611c->edid_len - offset);
> + memcpy(lt9611c->edid_buf + offset, &return_edid_data[5],
> bytes_to_copy);
Don't store EDID in the long-term structures. Read it on demand.
> + }
> +
> + lt9611c->edid_valid = true;
> +
> + return ret;
> +}
> +
> +static int lt9611c_get_edid_block(void *data, u8 *buf, unsigned int block,
> size_t len)
> +{
> + struct lt9611c *lt9611c = data;
> + struct device *dev = lt9611c->dev;
> + unsigned int total_blocks;
> + int ret;
> +
> + if (len > 128)
> + return -EINVAL;
> +
> + guard(mutex)(<9611c->ocm_lock);
> + if (block == 0 || !lt9611c->edid_valid) {
> + ret = lt9611c_read_edid(lt9611c);
> + if (ret) {
> + dev_err(dev, "EDID read failed\n");
> + return ret;
> + }
> + }
> +
> + total_blocks = lt9611c->edid_len / 128;
> + if (!total_blocks) {
> + dev_err(dev, "No valid EDID blocks\n");
> + return -EIO;
> + }
> +
> + if (block >= total_blocks) {
> + dev_err(dev, "Requested block %u exceeds total blocks %u\n",
> + block, total_blocks);
> + return -EINVAL;
> + }
> +
> + memcpy(buf, lt9611c->edid_buf + block * 128, len);
> +
> + return 0;
> +}
> +
> +static const struct drm_edid *lt9611c_bridge_edid_read(struct drm_bridge
> *bridge,
> + struct drm_connector
> *connector)
> +{
> + struct lt9611c *lt9611c = bridge_to_lt9611c(bridge);
> +
> + usleep_range(10000, 20000);
Why?
> + return drm_edid_read_custom(connector, lt9611c_get_edid_block, lt9611c);
> +}
> +
> +static const struct drm_bridge_funcs lt9611c_bridge_funcs = {
> + .attach = lt9611c_bridge_attach,
> + .mode_valid = lt9611c_bridge_mode_valid,
> + .mode_set = lt9611c_bridge_mode_set,
> + .detect = lt9611c_bridge_detect,
> + .edid_read = lt9611c_bridge_edid_read,
> +};
> +
> +static int lt9611c_parse_dt(struct device *dev,
> + struct lt9611c *lt9611c)
> +{
> + lt9611c->dsi0_node = of_graph_get_remote_node(dev->of_node, 0, -1);
> + if (!lt9611c->dsi0_node) {
> + dev_err(dev, "failed to get remote node for primary dsi\n");
> + return -ENODEV;
> + }
> +
> + lt9611c->dsi1_node = of_graph_get_remote_node(dev->of_node, 1, -1);
> +
> + return drm_of_find_panel_or_bridge(dev->of_node, 2, -1, NULL,
> <9611c->next_bridge);
> +}
> +
> +static int lt9611c_gpio_init(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> +
> + lt9611c->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(lt9611c->reset_gpio)) {
> + dev_err(dev, "failed to acquire reset gpio\n");
> + return PTR_ERR(lt9611c->reset_gpio);
> + }
> +
> + return 0;
> +}
> +
> +static void lt9611c_read_version(struct lt9611c *lt9611c, u64 *version)
> +{
> + u8 val;
> + u64 ver = 0;
> +
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0xee, 0x01);
> +
> + i2c_read_byte(lt9611c, 0x80, &val);
> + ver = val;
> +
> + i2c_read_byte(lt9611c, 0x81, &val);
> + ver = (ver << 8) | val;
> +
> + *version = ver;
> +}
> +
> +static int lt9611c_read_chipid(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + u8 val = 0;
> +
> + i2c_write_byte(lt9611c, 0xff, 0xe0);
> + i2c_write_byte(lt9611c, 0xee, 0x01);
> + i2c_write_byte(lt9611c, 0xff, 0xe1);
> +
> + i2c_read_byte(lt9611c, 0x00, &val);
> + if (val != 0x23)
> + return -ENODEV;
> +
> + i2c_read_byte(lt9611c, 0x01, &val);
> + if (val != 0x06)
> + return -ENODEV;
> +
> + dev_info(dev, "ChipId = 0x2306\n");
> +
> + return 0;
> +}
> +
> +static int lt9611c_hdmi_hw_params(struct device *dev, void *data,
> + struct hdmi_codec_daifmt *fmt,
> + struct hdmi_codec_params *hparms)
> +{
> + struct lt9611c *lt9611c = dev_get_drvdata(dev);
> +
> + dev_info(lt9611c->dev, "SOC sample_rate: %d, sample_width: %d, fmt:
> %d\n",
> + hparms->sample_rate, hparms->sample_width, fmt->fmt);
> +
> + switch (hparms->sample_rate) {
> + case 32000:
> + case 44100:
> + case 48000:
> + case 88200:
> + case 96000:
> + case 176400:
> + case 192000:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (hparms->sample_width) {
> + case 16:
> + case 18:
> + case 20:
> + case 24:
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + switch (fmt->fmt) {
> + case HDMI_I2S:
> + case HDMI_SPDIF:
> + break;
> + default:
> + return -EINVAL;
> + }
Does that add anything on top of the limitations of hdmi-codec.c?
> +
> + return 0;
> +}
> +
> +static void lt9611c_audio_shutdown(struct device *dev, void *data)
> +{
> +}
> +
> +static int lt9611c_audio_startup(struct device *dev, void *data)
> +{
> + return 0;
> +}
> +
> +static void lt9611c_audio_update_connector_status(struct lt9611c *lt9611c)
> +{
> + enum drm_connector_status status;
> +
> + status = lt9611c->audio_status;
> + if (lt9611c->plugged_cb && lt9611c->codec_dev)
> + lt9611c->plugged_cb(lt9611c->codec_dev,
> + status == connector_status_connected);
> +}
> +
> +static int lt9611c_hdmi_audio_hook_plugged_cb(struct device *dev,
> + void *data,
> + hdmi_codec_plugged_cb fn,
> + struct device *codec_dev)
> +{
> + struct lt9611c *lt9611c = data;
> +
> + lt9611c->plugged_cb = fn;
> + lt9611c->codec_dev = codec_dev;
> + lt9611c_audio_update_connector_status(lt9611c);
> +
> + return 0;
> +}
> +
> +static const struct hdmi_codec_ops lt9611c_codec_ops = {
> + .hw_params = lt9611c_hdmi_hw_params,
> + .audio_shutdown = lt9611c_audio_shutdown,
> + .audio_startup = lt9611c_audio_startup,
> + .hook_plugged_cb = lt9611c_hdmi_audio_hook_plugged_cb,
> +};
No, we have HDMI audio helpers for that. Drop this and use the helpers
instead.
> +
> +static int lt9611c_audio_init(struct device *dev, struct lt9611c *lt9611c)
> +{
> + struct hdmi_codec_pdata codec_data = {
> + .ops = <9611c_codec_ops,
> + .max_i2s_channels = 2,
> + .i2s = 1,
> + .data = lt9611c,
> + };
> +
> + lt9611c->audio_pdev =
> + platform_device_register_data(dev, HDMI_CODEC_DRV_NAME,
> + PLATFORM_DEVID_AUTO,
> + &codec_data, sizeof(codec_data));
> +
> + return PTR_ERR_OR_ZERO(lt9611c->audio_pdev);
> +}
> +
> +static void lt9611c_audio_exit(struct lt9611c *lt9611c)
> +{
> + if (lt9611c->audio_pdev) {
> + platform_device_unregister(lt9611c->audio_pdev);
> + lt9611c->audio_pdev = NULL;
> + }
> +}
> +
> +static int lt9611c_firmware_update_store(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> + int ret;
> +
> + lt9611c_lock(lt9611c);
> + ret = lt9611c_prepare_firmware_data(lt9611c);
> + if (ret < 0) {
> + dev_err(dev, "Failed prepare firmware data: %d\n", ret);
> + goto out;
> + }
> +
> + ret = lt9611c_firmware_upgrade(lt9611c);
> + if (ret < 0) {
> + dev_err(dev, "upgrade failure\n");
> + goto out;
> + }
> + lt9611c_reset(lt9611c);
> + ret = lt9611c_upgrade_result(lt9611c);
> + if (ret < 0)
> + goto out;
> +
> +out:
> + lt9611c_unlock(lt9611c);
> + lt9611c_reset(lt9611c);
> + if (lt9611c->fw) {
> + release_firmware(lt9611c->fw);
> + lt9611c->fw = NULL;
> + }
> +
> + return ret;
> +}
> +
> +static ssize_t lt9611c_firmware_store(struct device *dev, struct
> device_attribute *attr,
> + const char *buf, size_t len)
> +{
> + struct lt9611c *lt9611c = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = lt9611c_firmware_update_store(lt9611c);
Inline
> + if (ret < 0)
> + return ret;
> + return len;
> +}
> +
> +static ssize_t lt9611c_firmware_show(struct device *dev, struct
> device_attribute *attr, char *buf)
> +{
> + struct lt9611c *lt9611c = dev_get_drvdata(dev);
> +
> + return sysfs_emit(buf, "0x%04llx\n", lt9611c->fw_version);
> +}
> +
> +static DEVICE_ATTR_RW(lt9611c_firmware);
> +
> +static struct attribute *lt9611c_attrs[] = {
> + &dev_attr_lt9611c_firmware.attr,
> + NULL,
> +};
> +
> +static const struct attribute_group lt9611c_attr_group = {
> + .attrs = lt9611c_attrs,
> +};
> +
> +static const struct attribute_group *lt9611c_attr_groups[] = {
> + <9611c_attr_group,
> + NULL,
> +};
> +
> +static void lt9611c_cleanup_resources(struct lt9611c *lt9611c)
> +{
> + struct device *dev = lt9611c->dev;
> +
> + if (lt9611c->work_inited) {
> + cancel_work_sync(<9611c->work);
> + lt9611c->work_inited = false;
> + dev_err(dev, "work cancelled\n");
Why???
> + }
> +
> + if (lt9611c->bridge_added) {
> + drm_bridge_remove(<9611c->bridge);
> + lt9611c->bridge_added = false;
> + dev_err(dev, "DRM bridge removed\n");
> + }
> +
> + if (lt9611c->regulators_enabled) {
> + regulator_bulk_disable(ARRAY_SIZE(lt9611c->supplies),
> lt9611c->supplies);
> + lt9611c->regulators_enabled = false;
> + dev_err(dev, "regulators disabled\n");
> + }
> +
> + if (lt9611c->audio_pdev)
> + lt9611c_audio_exit(lt9611c);
> +
> + if (lt9611c->fw) {
You definitely don't need firmware when the bridge is up and running.
> + release_firmware(lt9611c->fw);
> + lt9611c->fw = NULL;
> + dev_err(dev, "firmware released\n");
> + }
> +
> + if (lt9611c->dsi0_node) {
> + of_node_put(lt9611c->dsi0_node);
> + lt9611c->dsi0_node = NULL;
> + dev_err(dev, "dsi0 node released\n");
> + }
> +
> + if (lt9611c->dsi1_node) {
> + of_node_put(lt9611c->dsi1_node);
> + lt9611c->dsi1_node = NULL;
> + dev_err(dev, "dsi1 node released\n");
> + }
> +}
> +
> +static int lt9611c_main(void *data)
> +{
> + struct lt9611c *lt9611c = data;
> + struct device *dev = lt9611c->dev;
> + struct i2c_client *client = lt9611c->client;
> + int ret;
> +
> + lt9611c->work_inited = false;
> + lt9611c->bridge_added = false;
> + lt9611c->regulators_enabled = false;
> +
> + ret = lt9611c_parse_dt(dev, lt9611c);
> + if (ret) {
> + dev_err(dev, "failed to parse device tree\n");
> + return ret;
> + }
> +
> + ret = lt9611c_gpio_init(lt9611c);
> + if (ret < 0)
> + goto err_cleanup;
> +
> + ret = lt9611c_regulator_init(lt9611c);
> + if (ret < 0)
> + goto err_cleanup;
> +
> + ret = lt9611c_regulator_enable(lt9611c);
> + if (ret)
> + goto err_cleanup;
> +
> + lt9611c->regulators_enabled = true;
> +
> + lt9611c_reset(lt9611c);
> +
> + ret = lt9611c_read_chipid(lt9611c);
> + if (ret < 0) {
> + dev_err(dev, "failed to read chip id.\n");
> + goto err_cleanup;
> + }
> +
> + lt9611c_lock(lt9611c);
> + lt9611c_read_version(lt9611c, <9611c->fw_version);
> +
> + ret = lt9611c_prepare_firmware_data(lt9611c);
> + if (ret == 0 && lt9611c_upgrade_judgment(lt9611c) == UPGRADE) {
> + dev_info(dev, "firmware upgrade needed\n");
> +
> + ret = lt9611c_firmware_upgrade(lt9611c);
> + if (ret < 0) {
> + dev_err(dev, "firmware upgrade failed\n");
> + lt9611c_unlock(lt9611c);
> + goto err_cleanup;
> + }
> +
> + lt9611c_reset(lt9611c);
> + ret = lt9611c_upgrade_result(lt9611c);
> + if (ret < 0) {
> + lt9611c_unlock(lt9611c);
> + goto err_cleanup;
> + }
> +
> + lt9611c_read_version(lt9611c, <9611c->fw_version);
> + lt9611c_unlock(lt9611c);
> +
> + } else {
> + dev_info(dev, "skip firmware upgrade, using chip internal
> firmware\n");
> + lt9611c_unlock(lt9611c);
> + }
> +
> + if (lt9611c->fw) {
> + release_firmware(lt9611c->fw);
> + lt9611c->fw = NULL;
> + }
> + dev_info(dev, "current version:0x%04llx", lt9611c->fw_version);
> +
> + INIT_WORK(<9611c->work, lt9611c_hpd_work);
> + lt9611c->work_inited = true;
> +
> + if (!client->irq) {
> + dev_err(dev, "failed to get INTP IRQ\n");
> + ret = -ENODEV;
> + goto err_cleanup;
> + }
> +
> + ret = devm_request_threaded_irq(&client->dev, client->irq, NULL,
> + lt9611c_irq_thread_handler,
> + IRQF_TRIGGER_HIGH | IRQF_ONESHOT |
> + IRQF_NO_AUTOEN,
> + "lt9611c", lt9611c);
> + if (ret) {
> + dev_err(dev, "failed to request irq\n");
> + goto err_cleanup;
> + }
> +
> + lt9611c->bridge.funcs = <9611c_bridge_funcs;
> + lt9611c->bridge.of_node = lt9611c->client->dev.of_node;
> + lt9611c->bridge.ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID |
> DRM_BRIDGE_OP_HPD;
> + lt9611c->bridge.type = DRM_MODE_CONNECTOR_HDMIA;
> +
> + drm_bridge_add(<9611c->bridge);
> + lt9611c->bridge_added = true;
No unnecessary flags, please. Implement proper cleanup path, unwinding
resources one by one.
> +
> + /* Attach primary DSI */
> + lt9611c->dsi0 = lt9611c_attach_dsi(lt9611c, lt9611c->dsi0_node);
> + if (IS_ERR(lt9611c->dsi0)) {
> + ret = PTR_ERR(lt9611c->dsi0);
> + dev_err(dev, "Failed to attach primary DSI, error=%d\n", ret);
> + goto err_cleanup;
> + }
> +
> + /* Attach secondary DSI, if specified */
> + if (lt9611c->dsi1_node) {
> + lt9611c->dsi1 = lt9611c_attach_dsi(lt9611c, lt9611c->dsi1_node);
> + if (IS_ERR(lt9611c->dsi1)) {
> + ret = PTR_ERR(lt9611c->dsi1);
> + dev_err(dev, "Failed to attach secondary DSI,
> error=%d\n", ret);
> + goto err_cleanup;
> + }
> + }
> +
> + lt9611c->audio_status = connector_status_disconnected;
> +
> + ret = lt9611c_audio_init(dev, lt9611c);
> + if (ret < 0) {
> + dev_err(dev, "audio init failed\n");
> + goto err_cleanup;
> + }
> +
> + lt9611c_reset(lt9611c);
> + enable_irq(lt9611c->client->irq);
> +
> + return 0;
> +
> +err_cleanup:
> + lt9611c_cleanup_resources(lt9611c);
> + return ret;
> +}
> +
> +static int lt9611c_probe(struct i2c_client *client)
> +{
> + struct lt9611c *lt9611c;
> + struct device *dev = &client->dev;
> +
> + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> + dev_err(dev, "device doesn't support I2C\n");
> + return -ENODEV;
> + }
> +
> + lt9611c = devm_kzalloc(dev, sizeof(*lt9611c), GFP_KERNEL);
devm_drm_bridge_alloc()
> + if (!lt9611c)
> + return -ENOMEM;
> +
> + lt9611c->dev = dev;
> + lt9611c->client = client;
> + mutex_init(<9611c->ocm_lock);
> +
> + lt9611c->regmap = devm_regmap_init_i2c(client, <9611c_regmap_config);
> + if (IS_ERR(lt9611c->regmap)) {
> + dev_err(dev, "regmap i2c init failed\n");
> + return PTR_ERR(lt9611c->regmap);
> + }
> +
> + i2c_set_clientdata(client, lt9611c);
> +
> + lt9611c->kthread = kthread_run(lt9611c_main, lt9611c, "lt9611c");
Why do you need extra kthread for that???
> + if (IS_ERR(lt9611c->kthread)) {
> + dev_err(dev, "Failed to create kernel thread\n");
> + return PTR_ERR(lt9611c->kthread);
> + }
> +
> + return 0;
> +}
> +
> +static void lt9611c_remove(struct i2c_client *client)
> +{
> + struct lt9611c *lt9611c = i2c_get_clientdata(client);
> + struct device *dev = lt9611c->dev;
> +
> + kfree(lt9611c->edid_buf);
> + disable_irq(client->irq);
> + lt9611c_cleanup_resources(lt9611c);
> + mutex_destroy(<9611c->ocm_lock);
> + dev_info(dev, "remove driver\n");
> +}
> +
> +static int lt9611c_bridge_suspend(struct device *dev)
> +{
> + struct lt9611c *lt9611c = dev_get_drvdata(dev);
> + int ret;
> +
> + dev_info(lt9611c->dev, "suspend\n");
> + disable_irq(lt9611c->client->irq);
> + ret = lt9611c_regulator_disable(lt9611c);
> + gpiod_set_value_cansleep(lt9611c->reset_gpio, 0);
> +
> + return ret;
> +}
> +
> +static int lt9611c_bridge_resume(struct device *dev)
> +{
> + struct lt9611c *lt9611c = dev_get_drvdata(dev);
> + int ret;
> +
> + ret = lt9611c_regulator_enable(lt9611c);
> + lt9611c_reset(lt9611c);
> + enable_irq(lt9611c->client->irq);
> + dev_info(lt9611c->dev, "resume\n");
> +
> + return ret;
> +}
> +
> +static const struct dev_pm_ops lt9611c_bridge_pm_ops = {
> + SET_SYSTEM_SLEEP_PM_OPS(lt9611c_bridge_suspend,
> + lt9611c_bridge_resume)
> +};
> +
> +static struct i2c_device_id lt9611c_id[] = {
> + { "lontium,lt9611c", 0 },
> + { /* sentinel */ }
> +};
> +
> +static const struct of_device_id lt9611c_match_table[] = {
> + { .compatible = "lontium,lt9611c" },
Your schema also had lt9611uxd
> + { /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, lt9611c_match_table);
> +
> +static struct i2c_driver lt9611c_driver = {
> + .driver = {
> + .name = "lt9611c",
> + .of_match_table = lt9611c_match_table,
> + .pm = <9611c_bridge_pm_ops,
> + .dev_groups = lt9611c_attr_groups,
> + },
> + .probe = lt9611c_probe,
> + .remove = lt9611c_remove,
> + .id_table = lt9611c_id,
> +};
> +module_i2c_driver(lt9611c_driver);
> +
> +MODULE_AUTHOR("syyang <syy...@lontium.com>");
> +MODULE_LICENSE("GPL v2");
> +
> +MODULE_FIRMWARE(FW_FILE);
> --
> 2.25.1
>
--
With best wishes
Dmitry
