From: Icenowy Zheng <icen...@aosc.io>

The ANX6345 is an ultra-low power DisplayPower/eDP transmitter designed
for portable devices. This driver adds initial support for RGB to eDP
mode, without HPD and interrupts.

This is a configuration usually seen in eDP applications.

Signed-off-by: Icenowy Zheng <icen...@aosc.io>
Signed-off-by: Vasily Khoruzhick <anars...@gmail.com>
---
 drivers/gpu/drm/bridge/analogix/Kconfig       |  11 +
 drivers/gpu/drm/bridge/analogix/Makefile      |   1 +
 .../drm/bridge/analogix/analogix-anx6345.c    | 845 ++++++++++++++++++
 .../drm/bridge/analogix/analogix-i2c-dptx.c   |   2 +-
 .../drm/bridge/analogix/analogix-i2c-dptx.h   |   8 +
 .../bridge/analogix/analogix-i2c-txcommon.h   |   3 +
 6 files changed, 869 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c

diff --git a/drivers/gpu/drm/bridge/analogix/Kconfig 
b/drivers/gpu/drm/bridge/analogix/Kconfig
index ed2d05c12546..3c6ec535d361 100644
--- a/drivers/gpu/drm/bridge/analogix/Kconfig
+++ b/drivers/gpu/drm/bridge/analogix/Kconfig
@@ -1,3 +1,14 @@
+config DRM_ANALOGIX_ANX6345
+       tristate "Analogix ANX6345 bridge"
+       select DRM_ANALOGIX_DP_I2C
+       select DRM_KMS_HELPER
+       select REGMAP_I2C
+       help
+         ANX6345 is an ultra-low Full-HD DisplayPort/eDP
+         transmitter designed for portable devices. The
+         ANX6345 transforms the LVTTL RGB output of an
+         application processor to eDP or DisplayPort.
+
 config DRM_ANALOGIX_ANX78XX
        tristate "Analogix ANX78XX bridge"
        select DRM_ANALOGIX_DP_I2C
diff --git a/drivers/gpu/drm/bridge/analogix/Makefile 
b/drivers/gpu/drm/bridge/analogix/Makefile
index 2d523b67487d..12fed7b04e1e 100644
--- a/drivers/gpu/drm/bridge/analogix/Makefile
+++ b/drivers/gpu/drm/bridge/analogix/Makefile
@@ -1,5 +1,6 @@
 analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o
 analogix_dp_i2c-objs := analogix-i2c-dptx.o
+obj-$(CONFIG_DRM_ANALOGIX_ANX6345) += analogix-anx6345.o
 obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
 obj-$(CONFIG_DRM_ANALOGIX_DP) += analogix_dp.o
 obj-$(CONFIG_DRM_ANALOGIX_DP_I2C) += analogix_dp_i2c.o
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c 
b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
new file mode 100644
index 000000000000..6098e245e074
--- /dev/null
+++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
@@ -0,0 +1,845 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright(c) Icenowy Zheng <icen...@aosc.io>
+ * Based on analogix-anx6345.c, which is:
+ *   Copyright(c) 2016, Analogix Semiconductor.
+ */
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_gpio.h>
+#include <linux/of_platform.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_dp_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+
+#include "analogix-i2c-dptx.h"
+#include "analogix-i2c-txcommon.h"
+
+#define I2C_NUM_ADDRESSES      2
+#define I2C_IDX_DPTX           0
+#define I2C_IDX_TXCOM          1
+
+#define XTAL_CLK               270 /* 27M */
+
+#define POLL_DELAY             50000 /* us */
+#define POLL_TIMEOUT           5000000 /* us */
+
+static const u8 anx6345_i2c_addresses[] = {
+       [I2C_IDX_DPTX]  = ANALOGIX_I2C_DPTX,
+       [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON,
+};
+
+struct anx6345_platform_data {
+       struct regulator *dvdd12;
+       struct regulator *dvdd25;
+       struct gpio_desc *gpiod_reset;
+};
+
+struct anx6345 {
+       struct drm_dp_aux aux;
+       struct drm_bridge bridge;
+       struct i2c_client *client;
+       struct edid *edid;
+       struct drm_connector connector;
+       struct drm_dp_link link;
+       struct drm_panel *panel;
+       struct anx6345_platform_data pdata;
+       struct mutex lock;
+
+       /*
+        * I2C Slave addresses of ANX6345 are mapped as DPTX and SYS
+        */
+       struct i2c_client *i2c_clients[I2C_NUM_ADDRESSES];
+       struct regmap *map[I2C_NUM_ADDRESSES];
+
+       u16 chipid;
+       u8 dpcd[DP_RECEIVER_CAP_SIZE];
+
+       bool powered;
+};
+
+static inline struct anx6345 *connector_to_anx6345(struct drm_connector *c)
+{
+       return container_of(c, struct anx6345, connector);
+}
+
+static inline struct anx6345 *bridge_to_anx6345(struct drm_bridge *bridge)
+{
+       return container_of(bridge, struct anx6345, bridge);
+}
+
+static int anx6345_set_bits(struct regmap *map, u8 reg, u8 mask)
+{
+       return regmap_update_bits(map, reg, mask, mask);
+}
+
+static int anx6345_clear_bits(struct regmap *map, u8 reg, u8 mask)
+{
+       return regmap_update_bits(map, reg, mask, 0);
+}
+
+static ssize_t anx6345_aux_transfer(struct drm_dp_aux *aux,
+                                   struct drm_dp_aux_msg *msg)
+{
+       struct anx6345 *anx6345 = container_of(aux, struct anx6345, aux);
+
+       return anx_aux_transfer(anx6345->map[I2C_IDX_DPTX], msg);
+}
+
+static int anx6345_dp_link_training(struct anx6345 *anx6345)
+{
+       unsigned int value;
+       u8 dp_bw;
+       int err;
+
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+                                SP_POWERDOWN_CTRL_REG,
+                                SP_TOTAL_PD);
+       if (err)
+               return err;
+
+       err = drm_dp_dpcd_readb(&anx6345->aux, DP_MAX_LINK_RATE, &dp_bw);
+       if (err < 0)
+               return err;
+
+       switch (dp_bw) {
+       case DP_LINK_BW_1_62:
+       case DP_LINK_BW_2_7:
+               break;
+
+       default:
+               DRM_DEBUG_KMS("DP bandwidth (%#02x) not supported\n", dp_bw);
+               return -EINVAL;
+       }
+
+       err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+                              SP_VIDEO_MUTE);
+       if (err)
+               return err;
+
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+                                SP_VID_CTRL1_REG, SP_VIDEO_EN);
+       if (err)
+               return err;
+
+       /* Get DPCD info */
+       err = drm_dp_dpcd_read(&anx6345->aux, DP_DPCD_REV,
+                              &anx6345->dpcd, DP_RECEIVER_CAP_SIZE);
+       if (err < 0) {
+               DRM_ERROR("Failed to read DPCD: %d\n", err);
+               return err;
+       }
+
+       /* Clear channel x SERDES power down */
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
+                                SP_DP_ANALOG_POWER_DOWN_REG, SP_CH0_PD);
+       if (err)
+               return err;
+
+       /* Check link capabilities */
+       err = drm_dp_link_probe(&anx6345->aux, &anx6345->link);
+       if (err < 0) {
+               DRM_ERROR("Failed to probe link capabilities: %d\n", err);
+               return err;
+       }
+
+       /* Power up the sink */
+       err = drm_dp_link_power_up(&anx6345->aux, &anx6345->link);
+       if (err < 0) {
+               DRM_ERROR("Failed to power up DisplayPort link: %d\n", err);
+               return err;
+       }
+
+       /* Possibly enable downspread on the sink */
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                          SP_DP_DOWNSPREAD_CTRL1_REG, 0);
+       if (err)
+               return err;
+
+       if (anx6345->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5) {
+               DRM_DEBUG("Enable downspread on the sink\n");
+               /* 4000PPM */
+               err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                                  SP_DP_DOWNSPREAD_CTRL1_REG, 8);
+               if (err)
+                       return err;
+
+               err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL,
+                                        DP_SPREAD_AMP_0_5);
+               if (err < 0)
+                       return err;
+       } else {
+               err = drm_dp_dpcd_writeb(&anx6345->aux, DP_DOWNSPREAD_CTRL, 0);
+               if (err < 0)
+                       return err;
+       }
+
+       /* Set the lane count and the link rate on the sink */
+       if (drm_dp_enhanced_frame_cap(anx6345->dpcd))
+               err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+                                      SP_DP_SYSTEM_CTRL_BASE + 4,
+                                      SP_ENHANCED_MODE);
+       else
+               err = anx6345_clear_bits(anx6345->map[I2C_IDX_DPTX],
+                                        SP_DP_SYSTEM_CTRL_BASE + 4,
+                                        SP_ENHANCED_MODE);
+       if (err)
+               return err;
+
+       value = drm_dp_link_rate_to_bw_code(anx6345->link.rate);
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                          SP_DP_MAIN_LINK_BW_SET_REG, value);
+       if (err)
+               return err;
+
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                          SP_DP_LANE_COUNT_SET_REG, anx6345->link.num_lanes);
+       if (err)
+               return err;
+
+       err = drm_dp_link_configure(&anx6345->aux, &anx6345->link);
+       if (err < 0) {
+               DRM_ERROR("Failed to configure DisplayPort link: %d\n", err);
+               return err;
+       }
+
+       /* Start training on the source */
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_LT_CTRL_REG,
+                          SP_LT_EN);
+       if (err)
+               return err;
+
+       err = regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
+                                      SP_DP_LT_CTRL_REG,
+                                      value, !(value & SP_DP_LT_INPROGRESS),
+                                      POLL_DELAY, POLL_TIMEOUT);
+       if (err)
+               return err;
+
+       return 0;
+}
+
+static int anx6345_tx_initialization(struct anx6345 *anx6345)
+{
+       int err, i;
+
+       /* FIXME: hardcode color depth now */
+       err = regmap_write(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL2_REG,
+                          SP_IN_BPC_6BIT << SP_IN_BPC_SHIFT);
+       if (err)
+               return err;
+
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX], SP_DP_PLL_CTRL_REG, 0);
+       if (err)
+               return err;
+
+       err = regmap_write(anx6345->map[I2C_IDX_TXCOM],
+                          SP_ANALOG_DEBUG1_REG, 0);
+       if (err)
+               return err;
+
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                          SP_DP_LINK_DEBUG_CTRL_REG,
+                          SP_NEW_PRBS7 | SP_M_VID_DEBUG);
+       if (err)
+               return err;
+
+       err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                          SP_DP_ANALOG_POWER_DOWN_REG, 0);
+       if (err)
+               return err;
+
+       /* Force HPD */
+       err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+                              SP_DP_SYSTEM_CTRL_BASE + 3,
+                              SP_HPD_FORCE | SP_HPD_CTRL);
+       if (err)
+               return err;
+
+       for (i = 0; i < 4; i++) {
+               /* 4 lanes */
+               err = regmap_write(anx6345->map[I2C_IDX_DPTX],
+                                  SP_DP_LANE0_LT_CTRL_REG + i, 0);
+               if (err)
+                       return err;
+       }
+
+       /* Reset AUX */
+       err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM],
+                              SP_RESET_CTRL2_REG, SP_AUX_RST);
+       if (err)
+               return err;
+
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+                                SP_RESET_CTRL2_REG, SP_AUX_RST);
+       if (err)
+               return err;
+
+       err = anx6345_dp_link_training(anx6345);
+       if (err)
+               return err;
+
+       return 0;
+}
+
+static void anx6345_poweron(struct anx6345 *anx6345)
+{
+       struct anx6345_platform_data *pdata = &anx6345->pdata;
+       int err;
+
+       if (WARN_ON(anx6345->powered))
+               return;
+
+       if (pdata->dvdd12) {
+               err = regulator_enable(pdata->dvdd12);
+               if (err) {
+                       DRM_ERROR("Failed to enable DVDD12 regulator: %d\n",
+                                 err);
+                       return;
+               }
+
+               usleep_range(1000, 2000);
+       }
+
+       if (pdata->dvdd25) {
+               err = regulator_enable(pdata->dvdd25);
+               if (err) {
+                       DRM_ERROR("Failed to enable DVDD25 regulator: %d\n",
+                                 err);
+                       return;
+               }
+
+               usleep_range(5000, 10000);
+       }
+
+       if (anx6345->panel)
+               drm_panel_prepare(anx6345->panel);
+
+       gpiod_set_value_cansleep(pdata->gpiod_reset, 0);
+       usleep_range(1000, 2000);
+
+       gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
+
+       /* Power on registers module */
+       anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+                        SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
+       anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+                          SP_REGISTER_PD | SP_TOTAL_PD);
+
+       anx6345->powered = true;
+}
+
+static void anx6345_poweroff(struct anx6345 *anx6345)
+{
+       struct anx6345_platform_data *pdata = &anx6345->pdata;
+       int err;
+
+       if (WARN_ON(!anx6345->powered))
+               return;
+
+       gpiod_set_value_cansleep(pdata->gpiod_reset, 1);
+       usleep_range(1000, 2000);
+
+       if (anx6345->panel)
+               drm_panel_unprepare(anx6345->panel);
+
+       if (pdata->dvdd25) {
+               err = regulator_disable(pdata->dvdd25);
+               if (err) {
+                       DRM_ERROR("Failed to disable DVDD25 regulator: %d\n",
+                                 err);
+                       return;
+               }
+
+               usleep_range(5000, 10000);
+       }
+
+       if (pdata->dvdd12) {
+               err = regulator_disable(pdata->dvdd12);
+               if (err) {
+                       DRM_ERROR("Failed to disable DVDD12 regulator: %d\n",
+                                 err);
+                       return;
+               }
+
+               usleep_range(1000, 2000);
+       }
+
+       anx6345->powered = false;
+}
+
+static int anx6345_start(struct anx6345 *anx6345)
+{
+       int err;
+
+       if (!anx6345->powered)
+               anx6345_poweron(anx6345);
+
+       /* Power on needed modules */
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
+                                SP_POWERDOWN_CTRL_REG,
+                                SP_VIDEO_PD | SP_LINK_PD);
+
+       err = anx6345_tx_initialization(anx6345);
+       if (err) {
+               DRM_ERROR("Failed transmitter initialization: %d\n", err);
+               goto err_poweroff;
+       }
+
+       /*
+        * This delay seems to help keep the hardware in a good state. Without
+        * it, there are times where it fails silently.
+        */
+       usleep_range(10000, 15000);
+
+       return 0;
+
+err_poweroff:
+       DRM_ERROR("Failed DisplayPort transmitter initialization: %d\n", err);
+       anx6345_poweroff(anx6345);
+
+       return err;
+}
+
+static int anx6345_init_pdata(struct anx6345 *anx6345)
+{
+       struct anx6345_platform_data *pdata = &anx6345->pdata;
+       struct device *dev = &anx6345->client->dev;
+
+       /* 1.2V digital core power regulator  */
+       pdata->dvdd12 = devm_regulator_get(dev, "dvdd12");
+       if (IS_ERR(pdata->dvdd12)) {
+               DRM_ERROR("DVDD12 regulator not found\n");
+               return PTR_ERR(pdata->dvdd12);
+       }
+
+       /* 2.5V digital core power regulator  */
+       pdata->dvdd25 = devm_regulator_get(dev, "dvdd25");
+       if (IS_ERR(pdata->dvdd25)) {
+               DRM_ERROR("DVDD25 regulator not found\n");
+               return PTR_ERR(pdata->dvdd25);
+       }
+
+       /* GPIO for chip reset */
+       pdata->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+
+       return PTR_ERR_OR_ZERO(pdata->gpiod_reset);
+}
+
+static int anx6345_config_dp_output(struct anx6345 *anx6345)
+{
+       int err;
+
+       err = anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+                                SP_VIDEO_MUTE);
+       if (err)
+               return err;
+
+       /* Enable DP output */
+       err = anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_VID_CTRL1_REG,
+                              SP_VIDEO_EN);
+       if (err)
+               return err;
+
+       /* Force stream valid */
+       err = anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
+                              SP_DP_SYSTEM_CTRL_BASE + 3,
+                              SP_STRM_FORCE | SP_STRM_CTRL);
+       if (err)
+               return err;
+
+       return 0;
+}
+
+static int anx6345_get_downstream_info(struct anx6345 *anx6345)
+{
+       u8 value;
+       int err;
+
+       err = drm_dp_dpcd_readb(&anx6345->aux, DP_SINK_COUNT, &value);
+       if (err < 0) {
+               DRM_ERROR("Get sink count failed %d\n", err);
+               return err;
+       }
+
+       if (!DP_GET_SINK_COUNT(value)) {
+               DRM_ERROR("Downstream disconnected\n");
+               return -EIO;
+       }
+
+       return 0;
+}
+
+static int anx6345_get_modes(struct drm_connector *connector)
+{
+       struct anx6345 *anx6345 = connector_to_anx6345(connector);
+       int err, num_modes = 0;
+
+       if (WARN_ON(!anx6345->powered))
+               return 0;
+
+       mutex_lock(&anx6345->lock);
+
+       if (!anx6345->edid) {
+               err = anx6345_get_downstream_info(anx6345);
+               if (err) {
+                       DRM_ERROR("Failed to get downstream info: %d\n", err);
+                       goto unlock;
+               }
+
+               anx6345->edid = drm_get_edid(connector, &anx6345->aux.ddc);
+               if (!anx6345->edid)
+                       DRM_ERROR("Failed to read EDID from panel\n");
+
+               err = drm_connector_update_edid_property(connector,
+                                                        anx6345->edid);
+               if (err) {
+                       DRM_ERROR("Failed to update EDID property: %d\n", err);
+                       goto unlock;
+               }
+       }
+
+       num_modes += drm_add_edid_modes(connector, anx6345->edid);
+
+unlock:
+       mutex_unlock(&anx6345->lock);
+
+       if (!num_modes && anx6345->panel)
+               num_modes += drm_panel_get_modes(anx6345->panel);
+
+       return num_modes;
+}
+
+static const struct drm_connector_helper_funcs anx6345_connector_helper_funcs 
= {
+       .get_modes = anx6345_get_modes,
+};
+
+static enum drm_connector_status anx6345_detect(struct drm_connector 
*connector,
+                                               bool force)
+{
+       return connector_status_connected;
+}
+
+static void
+anx6345_connector_destroy(struct drm_connector *connector)
+{
+       struct anx6345 *anx6345 = connector_to_anx6345(connector);
+
+       if (anx6345->panel)
+               drm_panel_detach(anx6345->panel);
+       drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_funcs anx6345_connector_funcs = {
+       .fill_modes = drm_helper_probe_single_connector_modes,
+       .detect = anx6345_detect,
+       .destroy = anx6345_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,
+};
+
+static int anx6345_bridge_attach(struct drm_bridge *bridge)
+{
+       struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+       int err;
+
+       if (!bridge->encoder) {
+               DRM_ERROR("Parent encoder object not found");
+               return -ENODEV;
+       }
+
+       /* Register aux channel */
+       anx6345->aux.name = "DP-AUX";
+       anx6345->aux.dev = &anx6345->client->dev;
+       anx6345->aux.transfer = anx6345_aux_transfer;
+
+       err = drm_dp_aux_register(&anx6345->aux);
+       if (err < 0) {
+               DRM_ERROR("Failed to register aux channel: %d\n", err);
+               return err;
+       }
+
+       err = drm_connector_init(bridge->dev, &anx6345->connector,
+                                &anx6345_connector_funcs,
+                                DRM_MODE_CONNECTOR_eDP);
+       if (err) {
+               DRM_ERROR("Failed to initialize connector: %d\n", err);
+               return err;
+       }
+
+       drm_connector_helper_add(&anx6345->connector,
+                                &anx6345_connector_helper_funcs);
+
+       err = drm_connector_register(&anx6345->connector);
+       if (err) {
+               DRM_ERROR("Failed to register connector: %d\n", err);
+               return err;
+       }
+
+       anx6345->connector.polled = DRM_CONNECTOR_POLL_HPD;
+
+       err = drm_connector_attach_encoder(&anx6345->connector,
+                                          bridge->encoder);
+       if (err) {
+               DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
+               return err;
+       }
+
+       if (anx6345->panel) {
+               err = drm_panel_attach(anx6345->panel, &anx6345->connector);
+               if (err) {
+                       DRM_ERROR("Failed to attach panel: %d\n", err);
+                       return err;
+               }
+       }
+
+       return 0;
+}
+
+static bool anx6345_bridge_mode_fixup(struct drm_bridge *bridge,
+                                     const struct drm_display_mode *mode,
+                                     struct drm_display_mode *adjusted_mode)
+{
+       if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+               return false;
+
+       /* Max 1200p at 5.4 Ghz, one lane */
+       if (mode->clock > 154000)
+               return false;
+
+       return true;
+}
+
+static void anx6345_bridge_disable(struct drm_bridge *bridge)
+{
+       struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+
+       /* Power off all modules except configuration registers access */
+       anx6345_set_bits(anx6345->map[I2C_IDX_TXCOM], SP_POWERDOWN_CTRL_REG,
+                        SP_HDCP_PD | SP_AUDIO_PD | SP_VIDEO_PD | SP_LINK_PD);
+       if (anx6345->panel)
+               drm_panel_disable(anx6345->panel);
+}
+
+static void anx6345_bridge_mode_set(struct drm_bridge *bridge,
+                                   struct drm_display_mode *mode,
+                                   struct drm_display_mode *adjusted_mode)
+{
+       struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+
+       if (WARN_ON(!anx6345->powered))
+               return;
+}
+
+static void anx6345_bridge_enable(struct drm_bridge *bridge)
+{
+       struct anx6345 *anx6345 = bridge_to_anx6345(bridge);
+       int err;
+
+       if (anx6345->panel)
+               drm_panel_enable(anx6345->panel);
+
+       err = anx6345_start(anx6345);
+       if (err) {
+               DRM_ERROR("Failed to initialize: %d\n", err);
+               return;
+       }
+
+       err = anx6345_config_dp_output(anx6345);
+       if (err)
+               DRM_ERROR("Failed to enable DP output: %d\n", err);
+}
+
+static const struct drm_bridge_funcs anx6345_bridge_funcs = {
+       .attach = anx6345_bridge_attach,
+       .mode_fixup = anx6345_bridge_mode_fixup,
+       .disable = anx6345_bridge_disable,
+       .mode_set = anx6345_bridge_mode_set,
+       .enable = anx6345_bridge_enable,
+};
+
+static void unregister_i2c_dummy_clients(struct anx6345 *anx6345)
+{
+       unsigned int i;
+
+       for (i = 1; i < ARRAY_SIZE(anx6345->i2c_clients); i++)
+               if (anx6345->i2c_clients[i] &&
+                   anx6345->i2c_clients[i]->addr != anx6345->client->addr)
+                       i2c_unregister_device(anx6345->i2c_clients[i]);
+}
+
+static const struct regmap_config anx6345_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = 0xff,
+};
+
+static const u16 anx6345_chipid_list[] = {
+       0x6345,
+};
+
+static int anx6345_i2c_probe(struct i2c_client *client,
+                            const struct i2c_device_id *id)
+{
+       struct anx6345 *anx6345;
+       struct anx6345_platform_data *pdata;
+       unsigned int i, idl, idh, version;
+       bool found = false;
+       int err;
+
+       anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
+       if (!anx6345)
+               return -ENOMEM;
+
+       pdata = &anx6345->pdata;
+
+       mutex_init(&anx6345->lock);
+
+       anx6345->bridge.of_node = client->dev.of_node;
+
+       anx6345->client = client;
+       i2c_set_clientdata(client, anx6345);
+
+       err = drm_of_find_panel_or_bridge(client->dev.of_node, 1, 0,
+                                         &anx6345->panel, NULL);
+       if (err == -EPROBE_DEFER)
+               return err;
+
+       if (err)
+               DRM_DEBUG("No panel found\n");
+
+       err = anx6345_init_pdata(anx6345);
+       if (err) {
+               DRM_ERROR("Failed to initialize pdata: %d\n", err);
+               return err;
+       }
+
+       /* Map slave addresses of ANX6345 */
+       for (i = 0; i < I2C_NUM_ADDRESSES; i++) {
+               if (anx6345_i2c_addresses[i] >> 1 != client->addr)
+                       anx6345->i2c_clients[i] = i2c_new_dummy(client->adapter,
+                                               anx6345_i2c_addresses[i] >> 1);
+               else
+                       anx6345->i2c_clients[i] = client;
+
+               if (!anx6345->i2c_clients[i]) {
+                       err = -ENOMEM;
+                       DRM_ERROR("Failed to reserve I2C bus %02x\n",
+                                 anx6345_i2c_addresses[i]);
+                       goto err_unregister_i2c;
+               }
+
+               anx6345->map[i] = devm_regmap_init_i2c(anx6345->i2c_clients[i],
+                                                      &anx6345_regmap_config);
+               if (IS_ERR(anx6345->map[i])) {
+                       err = PTR_ERR(anx6345->map[i]);
+                       DRM_ERROR("Failed regmap initialization %02x\n",
+                                 anx6345_i2c_addresses[i]);
+                       goto err_unregister_i2c;
+               }
+       }
+
+       /* Look for supported chip ID */
+       anx6345_poweron(anx6345);
+
+       err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG,
+                         &idl);
+       if (err)
+               goto err_poweroff;
+
+       err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG,
+                         &idh);
+       if (err)
+               goto err_poweroff;
+
+       anx6345->chipid = (u8)idl | ((u8)idh << 8);
+
+       err = regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
+                         &version);
+       if (err)
+               goto err_poweroff;
+
+       for (i = 0; i < ARRAY_SIZE(anx6345_chipid_list); i++) {
+               if (anx6345->chipid == anx6345_chipid_list[i]) {
+                       DRM_INFO("Found ANX%x (ver. %d) eDP Transmitter\n",
+                                anx6345->chipid, version);
+                       found = true;
+                       break;
+               }
+       }
+
+       if (!found) {
+               DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
+                         anx6345->chipid, version);
+               err = -ENODEV;
+               goto err_poweroff;
+       }
+
+       anx6345->bridge.funcs = &anx6345_bridge_funcs;
+
+       drm_bridge_add(&anx6345->bridge);
+
+       return 0;
+
+err_poweroff:
+       anx6345_poweroff(anx6345);
+
+err_unregister_i2c:
+       unregister_i2c_dummy_clients(anx6345);
+       return err;
+}
+
+static int anx6345_i2c_remove(struct i2c_client *client)
+{
+       struct anx6345 *anx6345 = i2c_get_clientdata(client);
+
+       drm_bridge_remove(&anx6345->bridge);
+
+       unregister_i2c_dummy_clients(anx6345);
+
+       kfree(anx6345->edid);
+
+       return 0;
+}
+
+static const struct i2c_device_id anx6345_id[] = {
+       { "anx6345", 0 },
+       { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, anx6345_id);
+
+static const struct of_device_id anx6345_match_table[] = {
+       { .compatible = "analogix,anx6345", },
+       { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, anx6345_match_table);
+
+static struct i2c_driver anx6345_driver = {
+       .driver = {
+                  .name = "anx6345",
+                  .of_match_table = of_match_ptr(anx6345_match_table),
+                 },
+       .probe = anx6345_i2c_probe,
+       .remove = anx6345_i2c_remove,
+       .id_table = anx6345_id,
+};
+module_i2c_driver(anx6345_driver);
+
+MODULE_DESCRIPTION("ANX6345 eDP Transmitter driver");
+MODULE_AUTHOR("Icenowy Zheng <icen...@aosc.io>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c 
b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
index 9cb30962032e..53b0e73d6a24 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.c
@@ -117,7 +117,7 @@ ssize_t anx_aux_transfer(struct regmap *map_dptx, struct 
drm_dp_aux_msg *msg)
        else    /* For non-zero-sized set the length field. */
                ctrl1 |= (msg->size - 1) << SP_AUX_LENGTH_SHIFT;
 
-       if ((msg->request & DP_AUX_I2C_READ) == 0) {
+       if ((msg->size > 0) && ((msg->request & DP_AUX_I2C_READ) == 0)) {
                /* When WRITE | MOT write values to data buffer */
                err = regmap_bulk_write(map_dptx,
                                        SP_DP_BUF_DATA0_REG, buffer,
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h 
b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
index c2ca854613a0..b29a0b3bc23c 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-dptx.h
@@ -75,7 +75,11 @@
 #define SP_CHA_STA                     BIT(2)
 /* Bits for DP System Control Register 3 */
 #define SP_HPD_STATUS                  BIT(6)
+#define SP_HPD_FORCE                   BIT(5)
+#define SP_HPD_CTRL                    BIT(4)
 #define SP_STRM_VALID                  BIT(2)
+#define SP_STRM_FORCE                  BIT(1)
+#define SP_STRM_CTRL                   BIT(0)
 /* Bits for DP System Control Register 4 */
 #define SP_ENHANCED_MODE               BIT(3)
 
@@ -120,6 +124,9 @@
 #define SP_LINK_BW_SET_MASK            0x1f
 #define SP_INITIAL_SLIM_M_AUD_SEL      BIT(5)
 
+/* DP Lane Count Setting Register */
+#define SP_DP_LANE_COUNT_SET_REG       0xa1
+
 /* DP Training Pattern Set Register */
 #define SP_DP_TRAINING_PATTERN_SET_REG 0xa2
 
@@ -133,6 +140,7 @@
 
 /* DP Link Training Control Register */
 #define SP_DP_LT_CTRL_REG              0xa8
+#define SP_DP_LT_INPROGRESS            0x80
 #define SP_LT_ERROR_TYPE_MASK          0x70
 #  define SP_LT_NO_ERROR               0x00
 #  define SP_LT_AUX_WRITE_ERROR                0x01
diff --git a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h 
b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
index 7d683573e970..480c98a225b1 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix-i2c-txcommon.h
@@ -183,6 +183,9 @@
 #define SP_VBIT                                BIT(1)
 #define SP_AUDIO_LAYOUT                        BIT(0)
 
+/* Analog Debug Register 1 */
+#define SP_ANALOG_DEBUG1_REG           0xdc
+
 /* Analog Debug Register 2 */
 #define SP_ANALOG_DEBUG2_REG           0xdd
 #define SP_FORCE_SW_OFF_BYPASS         0x20
-- 
2.20.1

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