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SubjectRe: [PATCH v3 5/7] drm/bridge: Add Analogix anx6345 support
On Mon, Jul 22, 2019 at 8:11 AM Torsten Duwe <duwe@lst.de> wrote:
>
> From: Icenowy Zheng <icenowy@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 <icenowy@aosc.io>
> Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
> Signed-off-by: Torsten Duwe <duwe@suse.de>
> ---
> drivers/gpu/drm/bridge/analogix/Kconfig | 12 +
> drivers/gpu/drm/bridge/analogix/Makefile | 1 +
> drivers/gpu/drm/bridge/analogix/analogix-anx6345.c | 797 +++++++++++++++++++++
> 3 files changed, 810 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
>
> --- a/drivers/gpu/drm/bridge/analogix/Kconfig
> +++ b/drivers/gpu/drm/bridge/analogix/Kconfig
> @@ -1,6 +1,18 @@
> # SPDX-License-Identifier: GPL-2.0-only
> +config DRM_ANALOGIX_ANX6345
> + tristate "Analogix ANX6345 bridge"
> + select DRM_ANALOGIX_DP
> + 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
> select DRM_KMS_HELPER
> select REGMAP_I2C
> help
> --- a/drivers/gpu/drm/bridge/analogix/Makefile
> +++ b/drivers/gpu/drm/bridge/analogix/Makefile
> @@ -1,4 +1,5 @@
> # SPDX-License-Identifier: GPL-2.0-only
> analogix_dp-objs := analogix_dp_core.o analogix_dp_reg.o 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
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/analogix/analogix-anx6345.c
> @@ -0,0 +1,793 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +/*
> + * Copyright(c) 2016, Analogix Semiconductor.
> + * Copyright(c) 2017, Icenowy Zheng <icenowy@aosc.io>
> + *
> + * Based on anx7808 driver obtained from chromeos with copyright:
> + * Copyright(c) 2013, Google Inc.
> + */
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>
> +#include <linux/regmap.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/types.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 <drm/drm_print.h>
> +#include <drm/drm_probe_helper.h>
> +
> +#include "analogix-i2c-dptx.h"
> +#include "analogix-i2c-txcommon.h"
> +
> +#define POLL_DELAY 50000 /* us */
> +#define POLL_TIMEOUT 5000000 /* us */
> +
> +#define I2C_IDX_DPTX 0
> +#define I2C_IDX_TXCOM 1
> +
> +static const u8 anx6345_i2c_addresses[] = {
> + [I2C_IDX_DPTX] = ANALOGIX_I2C_DPTX,
> + [I2C_IDX_TXCOM] = ANALOGIX_I2C_TXCOMMON,
> +};
> +#define I2C_NUM_ADDRESSES ARRAY_SIZE(anx6345_i2c_addresses)
> +
> +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 regulator *dvdd12;
> + struct regulator *dvdd25;
> + struct gpio_desc *gpiod_reset;
> + struct mutex lock; /* protect EDID access */
> +
> + /* 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_dp_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;
> +
> + return regmap_read_poll_timeout(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_LT_CTRL_REG,
> + value, !(value & SP_DP_LT_INPROGRESS),
> + POLL_DELAY, POLL_TIMEOUT);
> +}
> +
> +static int anx6345_tx_initialization(struct anx6345 *anx6345)
> +{
> + int err, i;
> +
> + /* FIXME: colordepth is hardcoded for 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;
> +
> + return anx6345_clear_bits(anx6345->map[I2C_IDX_TXCOM],
> + SP_RESET_CTRL2_REG, SP_AUX_RST);
> +}
> +
> +static void anx6345_poweron(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + /* Ensure reset is asserted before starting power on sequence */
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
> + usleep_range(1000, 2000);
> +
> + err = regulator_enable(anx6345->dvdd12);
> + if (err) {
> + DRM_ERROR("Failed to enable dvdd12 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + /* T1 - delay between VDD12 and VDD25 should be 0-2ms */
> + usleep_range(1000, 2000);
> +
> + err = regulator_enable(anx6345->dvdd25);
> + if (err) {
> + DRM_ERROR("Failed to enable dvdd25 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + /* T2 - delay between RESETN and all power rail stable,
> + * should be 2-5ms
> + */
> + usleep_range(2000, 5000);
> +
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 0);
> +
> + /* 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);
> +
> + if (anx6345->panel)
> + drm_panel_prepare(anx6345->panel);
> +
> + anx6345->powered = true;
> +}
> +
> +static void anx6345_poweroff(struct anx6345 *anx6345)
> +{
> + int err;
> +
> + gpiod_set_value_cansleep(anx6345->gpiod_reset, 1);
> + usleep_range(1000, 2000);
> +
> + if (anx6345->panel)
> + drm_panel_unprepare(anx6345->panel);
> +
> + err = regulator_disable(anx6345->dvdd25);
> + if (err) {
> + DRM_ERROR("Failed to disable dvdd25 regulator: %d\n",
> + err);
> + return;
> + }
> +
> + usleep_range(5000, 10000);
> +
> + err = regulator_disable(anx6345->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 eDP transmitter initialization: %d\n", err);
> + anx6345_poweroff(anx6345);
> + return err;
> + }
> +
> + err = anx6345_dp_link_training(anx6345);
> + if (err) {
> + DRM_ERROR("Failed link training: %d\n", err);
> + anx6345_poweroff(anx6345);
> + return err;
> + }
> +
> + /*
> + * 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;
> +}
> +
> +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 */
> + return anx6345_set_bits(anx6345->map[I2C_IDX_DPTX],
> + SP_DP_SYSTEM_CTRL_BASE + 3,
> + SP_STRM_FORCE | SP_STRM_CTRL);
> +}
> +
> +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;
> + bool power_off = false;
> +
> + mutex_lock(&anx6345->lock);
> +
> + if (!anx6345->edid) {
> + if (!anx6345->powered) {
> + anx6345_poweron(anx6345);
> + power_off = true;
> + }
> +
> + 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:
> + if (power_off)
> + anx6345_poweroff(anx6345);
> +
> + 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 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,
> + .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 enum drm_mode_status
> +anx6345_bridge_mode_valid(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode)
> +{
> + if (mode->flags & DRM_MODE_FLAG_INTERLACE)
> + return MODE_NO_INTERLACE;
> +
> + /* Max 1200p at 5.4 Ghz, one lane */
> + if (mode->clock > 154000)
> + return MODE_CLOCK_HIGH;
> +
> + return MODE_OK;
> +}
> +
> +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);
> +
> + if (anx6345->powered)
> + anx6345_poweroff(anx6345);
> +}
> +
> +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_valid = anx6345_bridge_mode_valid,
> + .disable = anx6345_bridge_disable,
> + .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,
> + .cache_type = REGCACHE_NONE,
> +};
> +
> +static const u16 anx6345_chipid_list[] = {
> + 0x6345,
> +};
> +
> +static bool anx6345_get_chip_id(struct anx6345 *anx6345)
> +{
> + unsigned int i, idl, idh, version;
> +
> + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDL_REG, &idl))
> + return false;
> +
> + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_IDH_REG, &idh))
> + return false;
> +
> + anx6345->chipid = (u8)idl | ((u8)idh << 8);
> +
> + if (regmap_read(anx6345->map[I2C_IDX_TXCOM], SP_DEVICE_VERSION_REG,
> + &version))
> + return false;
> +
> + 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);
> + return true;
> + }
> + }
> +
> + DRM_ERROR("ANX%x (ver. %d) not supported by this driver\n",
> + anx6345->chipid, version);
> +
> + return false;
> +}
> +
> +static int anx6345_i2c_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct anx6345 *anx6345;
> + struct device *dev;
> + int i, err;
> +
> + anx6345 = devm_kzalloc(&client->dev, sizeof(*anx6345), GFP_KERNEL);
> + if (!anx6345)
> + return -ENOMEM;
> +
> + mutex_init(&anx6345->lock);
> +
> + anx6345->bridge.of_node = client->dev.of_node;
> +
> + anx6345->client = client;
> + i2c_set_clientdata(client, anx6345);
> +
> + dev = &anx6345->client->dev;
> +
> + 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");
> +
> + /* 1.2V digital core power regulator */
> + anx6345->dvdd12 = devm_regulator_get(dev, "dvdd12-supply");
> + if (IS_ERR(anx6345->dvdd12)) {
> + DRM_ERROR("dvdd12-supply not found\n");
> + return PTR_ERR(anx6345->dvdd12);
> + }
> +
> + /* 2.5V digital core power regulator */
> + anx6345->dvdd25 = devm_regulator_get(dev, "dvdd25-supply");
> + if (IS_ERR(anx6345->dvdd25)) {
> + DRM_ERROR("dvdd25-supply not found\n");
> + return PTR_ERR(anx6345->dvdd25);
> + }
> +
> + /* GPIO for chip reset */
> + anx6345->gpiod_reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(anx6345->gpiod_reset)) {
> + DRM_ERROR("Reset gpio not found\n");
> + return PTR_ERR(anx6345->gpiod_reset);
> + }
> +
> + /* 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);
> + if (anx6345_get_chip_id(anx6345)) {
> + anx6345->bridge.funcs = &anx6345_bridge_funcs;
> + drm_bridge_add(&anx6345->bridge);
> +
> + return 0;
> + } else {
> + anx6345_poweroff(anx6345);
> + err = -ENODEV;
> + }
> +
> +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);
> +
> + mutex_destroy(&anx6345->lock);
> +
> + 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("Enric Balletbo i Serra <enric.balletbo@collabora.com>");

I believe Icenowy is the author of this driver. If you think otherwise
please add Enric to CC and get his Signed-off-by.

> +MODULE_LICENSE("GPL v2");

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