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Message-Id: <20251115-lt8713sx-bridge-driver-v1-2-bd5a1c1c730a@oss.qualcomm.com>
Date: Sat, 15 Nov 2025 06:33:57 +0530
From: Vishnu Saini <vishnu.saini@....qualcomm.com>
To: Andrzej Hajda <andrzej.hajda@...el.com>,
Neil Armstrong <neil.armstrong@...aro.org>,
Robert Foss <rfoss@...nel.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Tony <syyang@...tium.com>
Cc: dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Vishnu Saini <vishnu.saini@....qualcomm.com>,
prahlad.valluru@....qualcomm.com,
qc-display-maintainer@....qualcomm.com,
Prahlad Valluru <vvalluru@....qualcomm.com>
Subject: [PATCH 2/2] drm/bridge: add support for lontium lt8713sx bridge
driver
The lt8713sx is a Type-C/DP1.4 to Type-C/DP1.4/HDMI2.0 converter,
with three configurable DP1.4/HDMI2.0/DP++ output interfaces and
audio output interface.
Driver is required for firmware upgrade in the bridge chip.
Signed-off-by: Vishnu Saini <vishnu.saini@....qualcomm.com>
Co-developed-by: Prahlad Valluru <vvalluru@....qualcomm.com>
Signed-off-by: Prahlad Valluru <vvalluru@....qualcomm.com>
---
drivers/gpu/drm/bridge/Kconfig | 10 ++
drivers/gpu/drm/bridge/Makefile | 1 +
drivers/gpu/drm/bridge/lontium-lt8713sx.c | 717 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 728 insertions(+)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index a250afd8d662..7fef383ed7cb 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -184,6 +184,16 @@ config DRM_LONTIUM_LT9611UXC
HDMI signals
Please say Y if you have such hardware.
+config DRM_LONTIUM_LT8713SX
+ tristate "Lontium LT8713SX DP MST bridge"
+ depends on OF
+ select REGMAP_I2C
+ help
+ Driver for Lontium LT8713SX DP MST bridge
+ chip firmware upgrade, which converts Type-C/DP1.4
+ to 3 configurable Type-C/DP1.4/HDMI2.0 outputs
+ Please say Y if you have such hardware.
+
config DRM_ITE_IT66121
tristate "ITE IT66121 HDMI bridge"
depends on OF
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index c7dc03182e59..07eeb13fa497 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -16,6 +16,7 @@ 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_LT9611UXC) += lontium-lt9611uxc.o
+obj-$(CONFIG_DRM_LONTIUM_LT8713SX) += lontium-lt8713sx.o
obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
obj-$(CONFIG_DRM_MEGACHIPS_STDPXXXX_GE_B850V3_FW) += megachips-stdpxxxx-ge-b850v3-fw.o
obj-$(CONFIG_DRM_MICROCHIP_LVDS_SERIALIZER) += microchip-lvds.o
diff --git a/drivers/gpu/drm/bridge/lontium-lt8713sx.c b/drivers/gpu/drm/bridge/lontium-lt8713sx.c
new file mode 100644
index 000000000000..7e8d60586e28
--- /dev/null
+++ b/drivers/gpu/drm/bridge/lontium-lt8713sx.c
@@ -0,0 +1,717 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+#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 <linux/wait.h>
+#include <linux/workqueue.h>
+
+#define FW_FILE "lt8713sx_fw.bin"
+
+#define LT8713SX_PAGE_SIZE 256
+#define FW_12K_SIZE (12 * 1024)
+#define FW_64K_SIZE (64 * 1024)
+#define FW_256K_SIZE (256 * 1024)
+
+struct crc_config {
+ u8 width;
+ u32 poly;
+ u32 crc_init;
+ u32 xor_out;
+ bool ref_in;
+ bool ref_out;
+};
+
+struct lt8713sx {
+ struct device *dev;
+
+ struct regmap *regmap;
+ /* Protects all accesses to registers by stopping the on-chip MCU */
+ struct mutex ocm_lock;
+
+ struct gpio_desc *reset_gpio;
+ struct gpio_desc *enable_gpio;
+
+ struct regulator_bulk_data supplies[2];
+
+ struct i2c_client *client;
+ const struct firmware *fw;
+
+ u8 *fw_buffer;
+
+ u32 main_crc_value;
+ u32 bank_crc_value[17];
+
+ int bank_num;
+};
+
+static void lt8713sx_reset(struct lt8713sx *lt8713sx);
+
+static const struct regmap_range lt8713sx_ranges[] = {
+ {
+ .range_min = 0,
+ .range_max = 0xffff
+ },
+};
+
+static const struct regmap_access_table lt8713sx_table = {
+ .yes_ranges = lt8713sx_ranges,
+ .n_yes_ranges = ARRAY_SIZE(lt8713sx_ranges),
+};
+
+static const struct regmap_config lt8713sx_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .volatile_table = <8713sx_table,
+ .cache_type = REGCACHE_NONE,
+};
+
+static void lt8713sx_i2c_enable(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0xee, 0x01);
+}
+
+static void lt8713sx_i2c_disable(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0xee, 0x00);
+}
+
+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_config crc_cfg, const u8 *buf, u64 buf_len)
+{
+ u8 width = crc_cfg.width;
+ u32 poly = crc_cfg.poly;
+ u32 crc = crc_cfg.crc_init;
+ u32 xorout = crc_cfg.xor_out;
+ bool refin = crc_cfg.ref_in;
+ bool refout = crc_cfg.ref_out;
+ 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 u32 calculate_64K_crc(const u8 *upgrade_data, u64 len)
+{
+ struct crc_config crc_cfg = {
+ .width = 8,
+ .poly = 0x31,
+ .crc_init = 0,
+ .xor_out = 0,
+ .ref_out = false,
+ .ref_in = false,
+ };
+ u64 crc_size = FW_64K_SIZE - 1;
+ u8 default_val = 0xFF;
+
+ crc_cfg.crc_init = get_crc(crc_cfg, upgrade_data, len);
+
+ crc_size -= len;
+ while (crc_size--)
+ crc_cfg.crc_init = get_crc(crc_cfg, &default_val, 1);
+
+ return crc_cfg.crc_init;
+}
+
+static u32 calculate_12K_crc(const u8 *upgrade_data, u64 len)
+{
+ struct crc_config crc_cfg = {
+ .width = 8,
+ .poly = 0x31,
+ .crc_init = 0,
+ .xor_out = 0,
+ .ref_out = false,
+ .ref_in = false,
+ };
+ u64 crc_size = FW_12K_SIZE;
+ u8 default_val = 0xFF;
+
+ crc_cfg.crc_init = get_crc(crc_cfg, upgrade_data, len);
+
+ crc_size -= len;
+ while (crc_size--)
+ crc_cfg.crc_init = get_crc(crc_cfg, &default_val, 1);
+
+ return crc_cfg.crc_init;
+}
+
+static int lt8713sx_prepare_firmware_data(struct lt8713sx *lt8713sx)
+{
+ int ret = 0;
+
+ ret = request_firmware(<8713sx->fw, FW_FILE, lt8713sx->dev);
+ if (ret < 0) {
+ pr_err("request firmware failed\n");
+ return ret;
+ }
+
+ pr_debug("Firmware size: %zu bytes\n", lt8713sx->fw->size);
+
+ if (lt8713sx->fw->size > FW_256K_SIZE - 1) {
+ pr_err("Firmware size exceeds 256KB limit\n");
+ release_firmware(lt8713sx->fw);
+ return -EINVAL;
+ }
+
+ lt8713sx->fw_buffer = kzalloc(FW_256K_SIZE, GFP_KERNEL);
+ if (!lt8713sx->fw_buffer) {
+ release_firmware(lt8713sx->fw);
+ return -ENOMEM;
+ }
+
+ memset(lt8713sx->fw_buffer, 0xFF, FW_256K_SIZE);
+
+ if (lt8713sx->fw->size < FW_64K_SIZE) {
+ /*TODO: CRC should be calculated with 0xff also */
+ memcpy(lt8713sx->fw_buffer, lt8713sx->fw->data, lt8713sx->fw->size);
+ lt8713sx->fw_buffer[FW_64K_SIZE - 1] =
+ calculate_64K_crc(lt8713sx->fw->data, lt8713sx->fw->size);
+ lt8713sx->main_crc_value = lt8713sx->fw_buffer[FW_64K_SIZE - 1];
+ pr_debug("Main Firmware Data Crc=0x%02X\n", lt8713sx->main_crc_value);
+
+ } else {
+ //main firmware
+ memcpy(lt8713sx->fw_buffer, lt8713sx->fw->data, FW_64K_SIZE - 1);
+ lt8713sx->fw_buffer[FW_64K_SIZE - 1] =
+ calculate_64K_crc(lt8713sx->fw_buffer, FW_64K_SIZE - 1);
+ lt8713sx->main_crc_value = lt8713sx->fw_buffer[FW_64K_SIZE - 1];
+ pr_debug("Main Firmware Data Crc=0x%02X\n", lt8713sx->main_crc_value);
+
+ //bank firmware
+ memcpy(lt8713sx->fw_buffer + FW_64K_SIZE,
+ lt8713sx->fw->data + FW_64K_SIZE,
+ lt8713sx->fw->size - FW_64K_SIZE);
+
+ lt8713sx->bank_num = (lt8713sx->fw->size - FW_64K_SIZE + FW_12K_SIZE - 1) /
+ FW_12K_SIZE;
+ pr_debug("Bank Number Total is %d.\n", lt8713sx->bank_num);
+
+ for (int i = 0; i < lt8713sx->bank_num; i++) {
+ lt8713sx->bank_crc_value[i] =
+ calculate_12K_crc(lt8713sx->fw_buffer + FW_64K_SIZE +
+ i * FW_12K_SIZE,
+ FW_12K_SIZE);
+ pr_debug("Bank number:%d; Firmware Data Crc:0x%02X\n",
+ i, lt8713sx->bank_crc_value[i]);
+ }
+ }
+ return 0;
+}
+
+static void lt8713sx_config_parameters(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xFF, 0xE0);
+ regmap_write(lt8713sx->regmap, 0xEE, 0x01);
+ regmap_write(lt8713sx->regmap, 0x5E, 0xC1);
+ regmap_write(lt8713sx->regmap, 0x58, 0x00);
+ regmap_write(lt8713sx->regmap, 0x59, 0x50);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x10);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x00);
+ regmap_write(lt8713sx->regmap, 0x58, 0x21);
+}
+
+static void lt8713sx_wren(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe1);
+ regmap_write(lt8713sx->regmap, 0x03, 0xbf);
+ regmap_write(lt8713sx->regmap, 0x03, 0xff);
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0x5a, 0x04);
+ regmap_write(lt8713sx->regmap, 0x5a, 0x00);
+}
+
+static void lt8713sx_wrdi(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0x5A, 0x08);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x00);
+}
+
+static void lt8713sx_fifo_reset(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe1);
+ regmap_write(lt8713sx->regmap, 0x03, 0xbf);
+ regmap_write(lt8713sx->regmap, 0x03, 0xff);
+}
+
+static void lt8713sx_disable_sram_write(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0x55, 0x00);
+}
+
+static void lt8713sx_sram_to_flash(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0x5a, 0x30);
+ regmap_write(lt8713sx->regmap, 0x5a, 0x00);
+}
+
+static void lt8713sx_i2c_to_sram(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0x55, 0x80);
+ regmap_write(lt8713sx->regmap, 0x5e, 0xc0);
+ regmap_write(lt8713sx->regmap, 0x58, 0x21);
+}
+
+static u8 lt8713sx_read_flash_status(struct lt8713sx *lt8713sx)
+{
+ u32 flash_status = 0;
+
+ regmap_write(lt8713sx->regmap, 0xFF, 0xE1);//fifo_rst_n
+ regmap_write(lt8713sx->regmap, 0x03, 0x3F);
+ regmap_write(lt8713sx->regmap, 0x03, 0xFF);
+
+ regmap_write(lt8713sx->regmap, 0xFF, 0xE0);
+ regmap_write(lt8713sx->regmap, 0x5e, 0x40);
+ regmap_write(lt8713sx->regmap, 0x56, 0x05);//opcode=read status register
+ regmap_write(lt8713sx->regmap, 0x55, 0x25);
+ regmap_write(lt8713sx->regmap, 0x55, 0x01);
+ regmap_write(lt8713sx->regmap, 0x58, 0x21);
+
+ regmap_read(lt8713sx->regmap, 0x5f, &flash_status);
+ pr_debug("flash_status:%x\n", flash_status);
+
+ return flash_status;
+}
+
+static void lt8713sx_block_erase(struct lt8713sx *lt8713sx)
+{
+ u32 i = 0;
+ u8 flash_status = 0;
+ u8 blocknum = 0x00;
+ u32 flashaddr = 0x00;
+
+ for (blocknum = 0; blocknum < 8; blocknum++) {
+ flashaddr = blocknum * 0x008000;
+ regmap_write(lt8713sx->regmap, 0xFF, 0xE0);
+ regmap_write(lt8713sx->regmap, 0xEE, 0x01);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x04);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x00);
+ regmap_write(lt8713sx->regmap, 0x5B, flashaddr >> 16);//set flash address[23:16]
+ regmap_write(lt8713sx->regmap, 0x5C, flashaddr >> 8);//set flash address[15:8]
+ regmap_write(lt8713sx->regmap, 0x5D, flashaddr);//set flash address[7:0]
+ regmap_write(lt8713sx->regmap, 0x5A, 0x01);
+ regmap_write(lt8713sx->regmap, 0x5A, 0x00);
+ msleep(100); //delay 100ms
+ i = 0;
+ while (1) {
+ flash_status = lt8713sx_read_flash_status(lt8713sx); //wait erase finish
+ if ((flash_status & 0x01) == 0)
+ break;
+
+ if (i > 50)
+ break;
+
+ i++;
+ msleep(50); //delay 50ms
+ }
+ }
+ pr_debug("erase flash done.\n");
+}
+
+static void lt8713sx_load_main_fw_to_sram(struct lt8713sx *lt8713sx)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0xee, 0x01);
+ regmap_write(lt8713sx->regmap, 0x68, 0x00);
+ regmap_write(lt8713sx->regmap, 0x69, 0x00);
+ regmap_write(lt8713sx->regmap, 0x6a, 0x00);
+ regmap_write(lt8713sx->regmap, 0x65, 0x00);
+ regmap_write(lt8713sx->regmap, 0x66, 0xff);
+ regmap_write(lt8713sx->regmap, 0x67, 0xff);
+ regmap_write(lt8713sx->regmap, 0x6b, 0x00);
+ regmap_write(lt8713sx->regmap, 0x6c, 0x00);
+ regmap_write(lt8713sx->regmap, 0x60, 0x01);
+ msleep(200);
+ regmap_write(lt8713sx->regmap, 0x60, 0x00);
+}
+
+static void lt8713sx_load_bank_fw_to_sram(struct lt8713sx *lt8713sx, u64 addr)
+{
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_write(lt8713sx->regmap, 0xee, 0x01);
+ regmap_write(lt8713sx->regmap, 0x68, ((addr & 0xFF0000) >> 16));
+ regmap_write(lt8713sx->regmap, 0x69, ((addr & 0x00FF00) >> 8));
+ regmap_write(lt8713sx->regmap, 0x6a, (addr & 0x0000FF));
+ regmap_write(lt8713sx->regmap, 0x65, 0x00);
+ regmap_write(lt8713sx->regmap, 0x66, 0x30);
+ regmap_write(lt8713sx->regmap, 0x67, 0x00);
+ regmap_write(lt8713sx->regmap, 0x6b, 0x00);
+ regmap_write(lt8713sx->regmap, 0x6c, 0x00);
+ regmap_write(lt8713sx->regmap, 0x60, 0x01);
+ msleep(50);
+ regmap_write(lt8713sx->regmap, 0x60, 0x00);
+}
+
+static int lt8713sx_write_data(struct lt8713sx *lt8713sx, const u8 *data, u64 filesize)
+{
+ int page = 0, num = 0, i = 0, val;
+
+ page = (filesize % LT8713SX_PAGE_SIZE) ?
+ ((filesize / LT8713SX_PAGE_SIZE) + 1) : (filesize / LT8713SX_PAGE_SIZE);
+
+ pr_debug("Writing to Sram=%u pages, total size = %llu bytes\n", page, filesize);
+
+ for (num = 0; num < page; num++) {
+ pr_debug("page[%d]\n", num);
+ lt8713sx_i2c_to_sram(lt8713sx);
+
+ for (i = 0; i < LT8713SX_PAGE_SIZE; i++) {
+ if ((num * LT8713SX_PAGE_SIZE + i) < filesize)
+ val = *(data + (num * LT8713SX_PAGE_SIZE + i));
+ else
+ val = 0xFF;
+ regmap_write(lt8713sx->regmap, 0x59, val);
+ }
+
+ lt8713sx_wren(lt8713sx);
+ lt8713sx_sram_to_flash(lt8713sx);
+ }
+
+ lt8713sx_wrdi(lt8713sx);
+ lt8713sx_disable_sram_write(lt8713sx);
+
+ return 0;
+}
+
+static void lt8713sx_main_upgrade_result(struct lt8713sx *lt8713sx)
+{
+ u32 main_crc_result;
+
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+ regmap_read(lt8713sx->regmap, 0x23, &main_crc_result);
+
+ pr_debug("Main CRC HW: 0x%02X\n", main_crc_result);
+ pr_debug("Main CRC FW: 0x%02X\n", lt8713sx->main_crc_value);
+
+ if (main_crc_result == lt8713sx->main_crc_value)
+ pr_debug("Main Firmware Upgrade Success.\n");
+ else
+ pr_err("Main Firmware Upgrade Failed.\n");
+}
+
+static void lt8713sx_bank_upgrade_result(struct lt8713sx *lt8713sx, u8 banknum)
+{
+ u32 bank_crc_result;
+
+ regmap_write(lt8713sx->regmap, 0xff, 0xe0);
+
+ regmap_read(lt8713sx->regmap, 0x23, &bank_crc_result);
+
+ pr_debug("Bank %d CRC Result: 0x%02X\n", banknum, bank_crc_result);
+
+ if (bank_crc_result == lt8713sx->bank_crc_value[banknum])
+ pr_debug("Bank %d Firmware Upgrade Success.\n", banknum);
+ else
+ pr_err("Bank %d Firmware Upgrade Failed.\n", banknum);
+}
+
+static void lt8713sx_bank_result_check(struct lt8713sx *lt8713sx)
+{
+ int i;
+ u64 addr = 0x010000;
+
+ for (i = 0; i < lt8713sx->bank_num; i++) {
+ lt8713sx_load_bank_fw_to_sram(lt8713sx, addr);
+ lt8713sx_bank_upgrade_result(lt8713sx, i);
+ addr += 0x3000;
+ }
+}
+
+static int lt8713sx_firmware_upgrade(struct lt8713sx *lt8713sx)
+{
+ int ret;
+
+ lt8713sx_config_parameters(lt8713sx);
+
+ lt8713sx_block_erase(lt8713sx);
+
+ if (lt8713sx->fw->size < FW_64K_SIZE) {
+ ret = lt8713sx_write_data(lt8713sx, lt8713sx->fw_buffer, FW_64K_SIZE);
+ if (ret < 0) {
+ pr_err("Failed to write firmware data: %d\n", ret);
+ return ret;
+ }
+ } else {
+ ret = lt8713sx_write_data(lt8713sx, lt8713sx->fw_buffer, lt8713sx->fw->size);
+ if (ret < 0) {
+ pr_err("Failed to write firmware data: %d\n", ret);
+ return ret;
+ }
+ }
+
+ pr_debug("Write Data done.\n");
+
+ return 0;
+}
+
+static int lt8713sx_firmware_update(struct lt8713sx *lt8713sx)
+{
+ int ret = 0;
+
+ mutex_lock(<8713sx->ocm_lock);
+ lt8713sx_i2c_enable(lt8713sx);
+
+ ret = lt8713sx_prepare_firmware_data(lt8713sx);
+ if (ret < 0) {
+ pr_err("Failed to prepare firmware data: %d\n", ret);
+ goto error;
+ }
+
+ ret = lt8713sx_firmware_upgrade(lt8713sx);
+ if (ret < 0) {
+ pr_err("Upgrade failure.\n");
+ goto error;
+ } else {
+ /* Validate CRC */
+ lt8713sx_load_main_fw_to_sram(lt8713sx);
+ lt8713sx_main_upgrade_result(lt8713sx);
+ lt8713sx_wrdi(lt8713sx);
+ lt8713sx_fifo_reset(lt8713sx);
+ lt8713sx_bank_result_check(lt8713sx);
+ lt8713sx_wrdi(lt8713sx);
+ }
+
+error:
+ lt8713sx_i2c_disable(lt8713sx);
+ if (!ret)
+ lt8713sx_reset(lt8713sx);
+
+ kfree(lt8713sx->fw_buffer);
+ lt8713sx->fw_buffer = NULL;
+
+ if (lt8713sx->fw) {
+ release_firmware(lt8713sx->fw);
+ lt8713sx->fw = NULL;
+ }
+ mutex_unlock(<8713sx->ocm_lock);
+
+ return ret;
+}
+
+static void lt8713sx_reset(struct lt8713sx *lt8713sx)
+{
+ pr_debug("reset bridge.\n");
+ gpiod_set_value_cansleep(lt8713sx->reset_gpio, 1);
+ msleep(20);
+
+ gpiod_set_value_cansleep(lt8713sx->reset_gpio, 0);
+ msleep(20);
+
+ gpiod_set_value_cansleep(lt8713sx->reset_gpio, 1);
+ msleep(20);
+ pr_debug("reset done.\n");
+}
+
+static int lt8713sx_regulator_init(struct lt8713sx *lt8713sx)
+{
+ int ret;
+
+ lt8713sx->supplies[0].supply = "vdd";
+ lt8713sx->supplies[1].supply = "vcc";
+
+ ret = devm_regulator_bulk_get(lt8713sx->dev, 2, lt8713sx->supplies);
+ if (ret < 0)
+ return ret;
+
+ return regulator_set_load(lt8713sx->supplies[0].consumer, 200000);
+}
+
+static int lt8713sx_regulator_enable(struct lt8713sx *lt8713sx)
+{
+ int ret;
+
+ ret = regulator_enable(lt8713sx->supplies[0].consumer);
+ if (ret < 0)
+ return ret;
+
+ usleep_range(1000, 10000);
+
+ ret = regulator_enable(lt8713sx->supplies[1].consumer);
+ if (ret < 0) {
+ regulator_disable(lt8713sx->supplies[0].consumer);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int lt8713sx_gpio_init(struct lt8713sx *lt8713sx)
+{
+ struct device *dev = lt8713sx->dev;
+
+ lt8713sx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(lt8713sx->reset_gpio)) {
+ dev_err(dev, "failed to acquire reset gpio\n");
+ return PTR_ERR(lt8713sx->reset_gpio);
+ }
+
+ /* power enable gpio */
+ lt8713sx->enable_gpio = devm_gpiod_get_optional(dev, "enable", GPIOD_OUT_HIGH);
+ if (IS_ERR(lt8713sx->enable_gpio)) {
+ dev_err(dev, "failed to acquire enable gpio\n");
+ return PTR_ERR(lt8713sx->enable_gpio);
+ }
+
+ return 0;
+}
+
+static ssize_t lt8713sx_firmware_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct lt8713sx *lt8713sx = dev_get_drvdata(dev);
+ int ret;
+
+ ret = lt8713sx_firmware_update(lt8713sx);
+ if (ret < 0)
+ return ret;
+ return len;
+}
+
+static DEVICE_ATTR_WO(lt8713sx_firmware);
+
+static struct attribute *lt8713sx_attrs[] = {
+ &dev_attr_lt8713sx_firmware.attr,
+ NULL,
+};
+
+static const struct attribute_group lt8713sx_attr_group = {
+ .attrs = lt8713sx_attrs,
+};
+
+static const struct attribute_group *lt8713sx_attr_groups[] = {
+ <8713sx_attr_group,
+ NULL,
+};
+
+static int lt8713sx_probe(struct i2c_client *client)
+{
+ struct lt8713sx *lt8713sx;
+ 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;
+ }
+
+ lt8713sx = devm_kzalloc(dev, sizeof(*lt8713sx), GFP_KERNEL);
+ if (!lt8713sx)
+ return -ENOMEM;
+
+ lt8713sx->dev = dev;
+ lt8713sx->client = client;
+ i2c_set_clientdata(client, lt8713sx);
+
+ mutex_init(<8713sx->ocm_lock);
+
+ lt8713sx->regmap = devm_regmap_init_i2c(client, <8713sx_regmap_config);
+ if (IS_ERR(lt8713sx->regmap)) {
+ dev_err(lt8713sx->dev, "regmap i2c init failed\n");
+ return PTR_ERR(lt8713sx->regmap);
+ }
+
+ ret = lt8713sx_gpio_init(lt8713sx);
+ if (ret < 0)
+ goto err_of_put;
+
+ ret = lt8713sx_regulator_init(lt8713sx);
+ if (ret < 0)
+ goto err_of_put;
+
+ ret = lt8713sx_regulator_enable(lt8713sx);
+ if (ret)
+ goto err_of_put;
+
+ lt8713sx_reset(lt8713sx);
+
+ return 0;
+
+err_of_put:
+ return ret;
+}
+
+static void lt8713sx_remove(struct i2c_client *client)
+{
+ struct lt8713sx *lt8713sx = i2c_get_clientdata(client);
+
+ mutex_destroy(<8713sx->ocm_lock);
+
+ regulator_bulk_disable(ARRAY_SIZE(lt8713sx->supplies), lt8713sx->supplies);
+}
+
+static struct i2c_device_id lt8713sx_id[] = {
+ { "lontium,lt8713sx", 0 },
+ { /* sentinel */ }
+};
+
+static const struct of_device_id lt8713sx_match_table[] = {
+ { .compatible = "lontium,lt8713sx" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lt8713sx_match_table);
+
+static struct i2c_driver lt8713sx_driver = {
+ .driver = {
+ .name = "lt8713sx",
+ .of_match_table = lt8713sx_match_table,
+ .dev_groups = lt8713sx_attr_groups,
+ },
+ .probe = lt8713sx_probe,
+ .remove = lt8713sx_remove,
+ .id_table = lt8713sx_id,
+};
+
+module_i2c_driver(lt8713sx_driver);
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("lt8713sx drm bridge driver");
+MODULE_AUTHOR("Tony <syyang@...tium.com>");
+MODULE_FIRMWARE(FW_FILE);
--
2.34.1
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