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SubjectRe: [PATCH v4 2/2] drm/bridge: Introduce LT8912 DSI to HDMI bridge
Hey Adrien,

This looks good to me. All that is missing is DRM_BRIDGE_OP_HPD
support, when that's been implemented I think this series is ready to
be merged.

On Tue, 23 Feb 2021 at 18:56, Adrien Grassein <adrien.grassein@gmail.com> wrote:
>
> Lontium Lt8912 is a DSI to HDMI bridge.
>
> Signed-off-by: Adrien Grassein <adrien.grassein@gmail.com>
> ---
> MAINTAINERS | 1 +
> drivers/gpu/drm/bridge/Kconfig | 14 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/lontium-lt8912.c | 764 ++++++++++++++++++++++++
> 4 files changed, 780 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 1e4d49f9dfea..fda331610c35 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -10464,6 +10464,7 @@ LONTIUM LT8912 MIPI TO HDMI BRIDGE
> M: Adrien Grassein <adrien.grassein@gmail.com>
> S: Maintained
> F: Documentation/devicetree/bindings/display/bridge/lontium,lt8912.yaml
> +F: drivers/gpu/drm/bridge/lontium-lt8912.c
>
> LSILOGIC MPT FUSION DRIVERS (FC/SAS/SPI)
> M: Sathya Prakash <sathya.prakash@broadcom.com>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index e4110d6ca7b3..5b36d4b86e3c 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -48,6 +48,20 @@ config DRM_DISPLAY_CONNECTOR
> on ARM-based platforms. Saying Y here when this driver is not needed
> will not cause any issue.
>
> +config DRM_LONTIUM_LT8912
> + tristate "Lontium LT8912 DSI/HDMI bridge"
> + depends on OF
> + select DRM_PANEL_BRIDGE
> + select DRM_KMS_HELPER
> + select REGMAP_I2C
> + help
> + Driver for Lontium LT8912 DSI to HDMI bridge
> + chip driver.
> + Please say Y if you have such hardware.
> +
> + Say M here if you want to support this hardware as a module.
> + The module will be named "lontium-lt8912".
> +
> config DRM_LONTIUM_LT9611
> tristate "Lontium LT9611 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 86e7acc76f8d..5a1b201cea1f 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -2,6 +2,7 @@
> obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
> obj-$(CONFIG_DRM_CHRONTEL_CH7033) += chrontel-ch7033.o
> obj-$(CONFIG_DRM_DISPLAY_CONNECTOR) += display-connector.o
> +obj-$(CONFIG_DRM_LONTIUM_LT8912) += lontium-lt8912.o
> obj-$(CONFIG_DRM_LONTIUM_LT9611) += lontium-lt9611.o
> obj-$(CONFIG_DRM_LONTIUM_LT9611UXC) += lontium-lt9611uxc.o
> obj-$(CONFIG_DRM_LVDS_CODEC) += lvds-codec.o
> diff --git a/drivers/gpu/drm/bridge/lontium-lt8912.c b/drivers/gpu/drm/bridge/lontium-lt8912.c
> new file mode 100644
> index 000000000000..11d94da73c37
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/lontium-lt8912.c
> @@ -0,0 +1,764 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/delay.h>
> +#include <linux/i2c.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/regmap.h>
> +
> +#include <drm/drm_probe_helper.h>
> +#include <drm/drm_atomic_helper.h>
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_of.h>
> +
> +#include <video/videomode.h>
> +
> +#define I2C_MAIN 0
> +#define I2C_ADDR_MAIN 0x48
> +
> +#define I2C_CEC_DSI 1
> +#define I2C_ADDR_CEC_DSI 0x49
> +
> +#define I2C_MAX_IDX 2
> +
> +struct lt8912 {
> + struct device *dev;
> + struct drm_bridge bridge;
> + struct drm_connector connector;
> +
> + struct i2c_client *i2c_client[I2C_MAX_IDX];
> + struct regmap *regmap[I2C_MAX_IDX];
> +
> + struct device_node *host_node;
> + struct drm_bridge *hdmi_port;
> +
> + struct mipi_dsi_device *dsi;
> +
> + struct gpio_desc *gp_reset;
> +
> + struct videomode mode;
> +
> + u8 data_lanes;
> + bool is_power_on;
> + bool is_attached;
> +};
> +
> +static int lt8912_write_init_config(struct lt8912 *lt)
> +{
> + const struct reg_sequence seq[] = {
> + /* Digital clock en*/
> + {0x08, 0xff},
> + {0x09, 0xff},
> + {0x0a, 0xff},
> + {0x0b, 0x7c},
> + {0x0c, 0xff},
> + {0x42, 0x04},
> +
> + /*Tx Analog*/
> + {0x31, 0xb1},
> + {0x32, 0xb1},
> + {0x33, 0x0e},
> + {0x37, 0x00},
> + {0x38, 0x22},
> + {0x60, 0x82},
> +
> + /*Cbus Analog*/
> + {0x39, 0x45},
> + {0x3a, 0x00},
> + {0x3b, 0x00},
> +
> + /*HDMI Pll Analog*/
> + {0x44, 0x31},
> + {0x55, 0x44},
> + {0x57, 0x01},
> + {0x5a, 0x02},
> +
> + /*MIPI Analog*/
> + {0x3e, 0xd6},
> + {0x3f, 0xd4},
> + {0x41, 0x3c},
> + {0xB2, 0x00},
> + };
> +
> + return regmap_multi_reg_write(lt->regmap[I2C_MAIN], seq, ARRAY_SIZE(seq));
> +}
> +
> +static int lt8912_write_mipi_basic_config(struct lt8912 *lt)
> +{
> + const struct reg_sequence seq[] = {
> + {0x12, 0x04},
> + {0x14, 0x00},
> + {0x15, 0x00},
> + {0x1a, 0x03},
> + {0x1b, 0x03},
> + };
> +
> + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
> +};
> +
> +static int lt8912_write_dds_config(struct lt8912 *lt)
> +{
> + const struct reg_sequence seq[] = {
> + {0x4e, 0xff},
> + {0x4f, 0x56},
> + {0x50, 0x69},
> + {0x51, 0x80},
> + {0x1f, 0x5e},
> + {0x20, 0x01},
> + {0x21, 0x2c},
> + {0x22, 0x01},
> + {0x23, 0xfa},
> + {0x24, 0x00},
> + {0x25, 0xc8},
> + {0x26, 0x00},
> + {0x27, 0x5e},
> + {0x28, 0x01},
> + {0x29, 0x2c},
> + {0x2a, 0x01},
> + {0x2b, 0xfa},
> + {0x2c, 0x00},
> + {0x2d, 0xc8},
> + {0x2e, 0x00},
> + {0x42, 0x64},
> + {0x43, 0x00},
> + {0x44, 0x04},
> + {0x45, 0x00},
> + {0x46, 0x59},
> + {0x47, 0x00},
> + {0x48, 0xf2},
> + {0x49, 0x06},
> + {0x4a, 0x00},
> + {0x4b, 0x72},
> + {0x4c, 0x45},
> + {0x4d, 0x00},
> + {0x52, 0x08},
> + {0x53, 0x00},
> + {0x54, 0xb2},
> + {0x55, 0x00},
> + {0x56, 0xe4},
> + {0x57, 0x0d},
> + {0x58, 0x00},
> + {0x59, 0xe4},
> + {0x5a, 0x8a},
> + {0x5b, 0x00},
> + {0x5c, 0x34},
> + {0x1e, 0x4f},
> + {0x51, 0x00},
> + };
> +
> + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
> +}
> +
> +static int lt8912_write_rxlogicres_config(struct lt8912 *lt)
> +{
> + int ret;
> +
> + ret = regmap_write(lt->regmap[I2C_MAIN], 0x03, 0x7f);
> + usleep_range(10000, 20000);
> + ret |= regmap_write(lt->regmap[I2C_MAIN], 0x03, 0xff);
> +
> + return ret;
> +};
> +
> +static int lt8912_write_lvds_config(struct lt8912 *lt)
> +{
> + const struct reg_sequence seq[] = {
> + {0x44, 0x30},
> + {0x51, 0x05},
> + {0x50, 0x24},
> + {0x51, 0x2d},
> + {0x52, 0x04},
> + {0x69, 0x0e},
> + {0x69, 0x8e},
> + {0x6a, 0x00},
> + {0x6c, 0xb8},
> + {0x6b, 0x51},
> + {0x04, 0xfb},
> + {0x04, 0xff},
> + {0x7f, 0x00},
> + {0xa8, 0x13},
> + {0x02, 0xf7},
> + {0x02, 0xff},
> + {0x03, 0xcf},
> + {0x03, 0xff},
> + };
> +
> + return regmap_multi_reg_write(lt->regmap[I2C_CEC_DSI], seq, ARRAY_SIZE(seq));
> +};
> +
> +static inline struct lt8912 *bridge_to_lt8912(struct drm_bridge *b)
> +{
> + return container_of(b, struct lt8912, bridge);
> +}
> +
> +static inline struct lt8912 *connector_to_lt8912(struct drm_connector *c)
> +{
> + return container_of(c, struct lt8912, connector);
> +}
> +
> +static const struct regmap_config lt8912_regmap_config = {
> + .reg_bits = 8,
> + .val_bits = 8,
> + .max_register = 0xff,
> +};
> +
> +static int lt8912_init_i2c(struct lt8912 *lt, struct i2c_client *client)
> +{
> + unsigned int i;
> + /*
> + * At this time we only initialize 2 chips, but the lt8912 provides
> + * a third interface for the audio over HDMI configuration.
> + */
> + struct i2c_board_info info[] = {
> + { I2C_BOARD_INFO("lt8912p0", I2C_ADDR_MAIN), },
> + { I2C_BOARD_INFO("lt8912p1", I2C_ADDR_CEC_DSI), },
> + };
> +
> + if (!lt)
> + return -ENODEV;
> +
> + for (i = 0; i < ARRAY_SIZE(info); i++) {
> + if (i > 0) {
> + lt->i2c_client[i] = i2c_new_dummy_device(client->adapter,
> + info[i].addr);
> + if (IS_ERR(lt->i2c_client[i]))
> + return PTR_ERR(lt->i2c_client[i]);
> + }
> +
> + lt->regmap[i] = devm_regmap_init_i2c(lt->i2c_client[i],
> + &lt8912_regmap_config);
> + if (IS_ERR(lt->regmap[i]))
> + return PTR_ERR(lt->regmap[i]);
> + }
> + return 0;
> +}
> +
> +static int lt8912_free_i2c(struct lt8912 *lt)
> +{
> + unsigned int i;
> +
> + for (i = 1; i < I2C_MAX_IDX; i++)
> + i2c_unregister_device(lt->i2c_client[i]);
> +
> + return 0;
> +}
> +
> +static int lt8912_hard_power_on(struct lt8912 *lt)
> +{
> + gpiod_set_value_cansleep(lt->gp_reset, 0);
> + msleep(20);
> +
> + return 0;
> +}
> +
> +static void lt8912_hard_power_off(struct lt8912 *lt)
> +{
> + gpiod_set_value_cansleep(lt->gp_reset, 1);
> + msleep(20);
> + lt->is_power_on = false;
> +}
> +
> +static int lt8912_video_setup(struct lt8912 *lt)
> +{
> + u32 hactive, h_total, hpw, hfp, hbp;
> + u32 vactive, v_total, vpw, vfp, vbp;
> + u8 settle = 0x08;
> + int ret;
> +
> + if (!lt)
> + return -EINVAL;
> +
> + hactive = lt->mode.hactive;
> + hfp = lt->mode.hfront_porch;
> + hpw = lt->mode.hsync_len;
> + hbp = lt->mode.hback_porch;
> + h_total = hactive + hfp + hpw + hbp;
> +
> + vactive = lt->mode.vactive;
> + vfp = lt->mode.vfront_porch;
> + vpw = lt->mode.vsync_len;
> + vbp = lt->mode.vback_porch;
> + v_total = vactive + vfp + vpw + vbp;
> +
> + if (vactive <= 600)
> + settle = 0x04;
> + else if (vactive == 1080)
> + settle = 0x0a;
> +
> + ret = regmap_write(lt->regmap[I2C_CEC_DSI], 0x10, 0x01);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x11, settle);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x18, hpw);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x19, vpw);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1c, hactive & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x1d, hactive >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x2f, 0x0c);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x34, h_total & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x35, h_total >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x36, v_total & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x37, v_total >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x38, vbp & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x39, vbp >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3a, vfp & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3b, vfp >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3c, hbp & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3d, hbp >> 8);
> +
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3e, hfp & 0xff);
> + ret |= regmap_write(lt->regmap[I2C_CEC_DSI], 0x3f, hfp >> 8);
> +
> + return ret;
> +}
> +
> +static int lt8912_soft_power_on(struct lt8912 *lt)
> +{
> + if (!lt->is_power_on) {
> + u32 lanes = lt->data_lanes;
> +
> + lt8912_write_init_config(lt);
> + regmap_write(lt->regmap[I2C_CEC_DSI], 0x13, lanes & 3);
> +
> + lt8912_write_mipi_basic_config(lt);
> +
> + lt->is_power_on = true;
> + }
> +
> + return 0;
> +}
> +
> +static int lt8912_video_on(struct lt8912 *lt)
> +{
> + int ret;
> +
> + ret = lt8912_video_setup(lt);
> + if (ret < 0)
> + goto end;
> +
> + ret = lt8912_write_dds_config(lt);
> + if (ret < 0)
> + goto end;
> +
> + ret = lt8912_write_rxlogicres_config(lt);
> + if (ret < 0)
> + goto end;
> +
> + ret = lt8912_write_lvds_config(lt);
> + if (ret < 0)
> + goto end;
> +
> +end:
> + return ret;
> +}
> +
> +static enum drm_connector_status
> +lt8912_connector_detect(struct drm_connector *connector, bool force)
> +{
> + struct lt8912 *lt = connector_to_lt8912(connector);
> +
> + return drm_bridge_detect(lt->hdmi_port);
> +}
> +
> +static const struct drm_connector_funcs lt8912_connector_funcs = {
> + .detect = lt8912_connector_detect,
> + .fill_modes = drm_helper_probe_single_connector_modes,
> + .destroy = drm_connector_cleanup,
> + .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 enum drm_mode_status
> +lt8912_connector_mode_valid(struct drm_connector *connector,
> + struct drm_display_mode *mode)
> +{
> + if (mode->clock > 150000)
> + return MODE_CLOCK_HIGH;
> +
> + if (mode->hdisplay > 1920)
> + return MODE_BAD_HVALUE;
> +
> + if (mode->vdisplay > 1080)
> + return MODE_BAD_VVALUE;
> +
> + return MODE_OK;
> +}
> +
> +static int lt8912_connector_get_modes(struct drm_connector *connector)
> +{
> + struct edid *edid;
> + int ret, num = 0;
> + struct lt8912 *lt = connector_to_lt8912(connector);
> + u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
> +
> + edid = drm_bridge_get_edid(lt->hdmi_port, connector);
> + if (edid) {
> + drm_connector_update_edid_property(connector, edid);
> + num = drm_add_edid_modes(connector, edid);
> + } else
> + return ret;
> +
> + ret = drm_display_info_set_bus_formats(&connector->display_info,
> + &bus_format, 1);
> + if (ret)
> + num = ret;
> +
> + kfree(edid);
> + return num;
> +}
> +
> +static const struct drm_connector_helper_funcs lt8912_connector_helper_funcs = {
> + .get_modes = lt8912_connector_get_modes,
> + .mode_valid = lt8912_connector_mode_valid,
> +};
> +
> +static void lt8912_bridge_mode_set(struct drm_bridge *bridge,
> + const struct drm_display_mode *mode,
> + const struct drm_display_mode *adj)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> +
> + drm_display_mode_to_videomode(adj, &lt->mode);
> +}
> +
> +static void lt8912_bridge_enable(struct drm_bridge *bridge)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> +
> + lt8912_video_on(lt);
> +}
> +
> +static int lt8912_attach_dsi(struct lt8912 *lt)
> +{
> + struct device *dev = lt->dev;
> + struct mipi_dsi_host *host;
> + struct mipi_dsi_device *dsi;
> + int ret = -1;
> + const struct mipi_dsi_device_info info = { .type = "lt8912",
> + .channel = 0,
> + .node = NULL,
> + };
> +
> + host = of_find_mipi_dsi_host_by_node(lt->host_node);
> + if (!host) {
> + dev_err(dev, "failed to find dsi host\n");
> + return -EPROBE_DEFER;
> + }
> +
> + dsi = mipi_dsi_device_register_full(host, &info);
> + if (IS_ERR(dsi)) {
> + ret = PTR_ERR(dsi);
> + dev_err(dev, "failed to create dsi device (%d)\n", ret);
> + goto err_dsi_device;
> + }
> +
> + lt->dsi = dsi;
> +
> + dsi->lanes = lt->data_lanes;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> +
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
> + MIPI_DSI_MODE_VIDEO_BURST |
> + MIPI_DSI_MODE_LPM |
> + MIPI_DSI_MODE_EOT_PACKET;
> +
> + ret = mipi_dsi_attach(dsi);
> + if (ret < 0) {
> + dev_err(dev, "failed to attach dsi to host\n");
> + goto err_dsi_attach;
> + }
> +
> + return 0;
> +
> +err_dsi_attach:
> + mipi_dsi_device_unregister(dsi);
> +err_dsi_device:
> + return ret;
> +}
> +
> +static void lt8912_detach_dsi(struct lt8912 *lt)
> +{
> + mipi_dsi_detach(lt->dsi);
> + mipi_dsi_device_unregister(lt->dsi);
> +}
> +
> +static int lt8912_bridge_connector_init(struct drm_bridge *bridge)
> +{
> + int ret;
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> + struct drm_connector *connector = &lt->connector;
> +
> + connector->polled = DRM_CONNECTOR_POLL_HPD;
> +
> + ret = drm_connector_init(bridge->dev, connector,
> + &lt8912_connector_funcs,
> + lt->hdmi_port->type);
> + if (ret)
> + goto exit;
> +
> + drm_connector_helper_add(connector, &lt8912_connector_helper_funcs);
> +
> + connector->dpms = DRM_MODE_DPMS_OFF;
> + drm_connector_attach_encoder(connector, bridge->encoder);
> +exit:
> + return ret;
> +}
> +
> +static int lt8912_bridge_attach(struct drm_bridge *bridge,
> + enum drm_bridge_attach_flags flags)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> + int ret;
> +
> + if (!(flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR)) {
> + ret = lt8912_bridge_connector_init(bridge);
> + if (ret) {
> + dev_err(lt->dev, "Failed to init bridge ! (%d)\n", ret);
> + return ret;
> + }
> + }
> +
> +
> + ret = lt8912_hard_power_on(lt);
> + if (ret)
> + return ret;
> +
> + ret = lt8912_soft_power_on(lt);
> + if (ret)
> + goto error;
> +
> + ret = lt8912_attach_dsi(lt);
> + if (ret)
> + goto error;
> +
> + lt->is_attached = true;
> +
> + return 0;
> +
> +error:
> + lt8912_hard_power_off(lt);
> + return ret;
> +}
> +
> +static void lt8912_bridge_detach(struct drm_bridge *bridge)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> +
> + if (lt->is_attached) {
> + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_HPD)
> + drm_bridge_hpd_disable(lt->hdmi_port);
> + lt8912_detach_dsi(lt);
> + lt8912_hard_power_off(lt);
> + }
> +}
> +
> +static bool lt8912_cable_is_connected(struct lt8912 *lt)
> +{
> + int ret;
> + unsigned int reg_val;
> +
> + ret = regmap_read(lt->regmap[I2C_MAIN], 0xC1, &reg_val);
> + if (ret)
> + return 0;
> +
> + return (reg_val & BIT(7));
> +}
> +
> +static enum drm_connector_status
> +lt8912_bridge_detect(struct drm_bridge *bridge)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> +
> + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_DETECT)
> + return drm_bridge_detect(lt->hdmi_port);
> + else if (lt8912_cable_is_connected(lt))
> + return connector_status_connected;
> +
> + return connector_status_disconnected;
> +}
> +
> +static struct edid *lt8912_bridge_get_edid(struct drm_bridge *bridge,
> + struct drm_connector *connector)
> +{
> + struct lt8912 *lt = bridge_to_lt8912(bridge);
> +
> + /*
> + * edid must be read through the ddc bus but it must be
> + * given to the hdmi connector node.
> + */
> + if (lt->hdmi_port->ops & DRM_BRIDGE_OP_EDID)
> + return drm_bridge_get_edid(lt->hdmi_port, connector);
> +
> + dev_warn(lt->dev, "The connected bridge does not supports DRM_BRIDGE_OP_EDID\n");
> + return NULL;
> +}
> +
> +static const struct drm_bridge_funcs lt8912_bridge_funcs = {
> + .attach = lt8912_bridge_attach,
> + .detach = lt8912_bridge_detach,
> + .mode_set = lt8912_bridge_mode_set,
> + .enable = lt8912_bridge_enable,
> + .detect = lt8912_bridge_detect,
> + .get_edid = lt8912_bridge_get_edid,
> +};
> +
> +static int lt8912_parse_dt(struct lt8912 *lt)
> +{
> + struct gpio_desc *gp_reset;
> + struct device *dev = lt->dev;
> + int ret = 0;
> + struct device_node *port_node;
> + struct device_node *endpoint;
> +
> + gp_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(gp_reset)) {
> + ret = PTR_ERR(gp_reset);
> + if (ret != -EPROBE_DEFER)
> + dev_err(dev, "Failed to get reset gpio: %d\n", ret);
> + return ret;
> + }
> + lt->gp_reset = gp_reset;
> +
> +
> + endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, -1);
> + if (IS_ERR(endpoint)) {
> + ret = PTR_ERR(endpoint);
> + goto end;
> + }
> +
> + lt->data_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
> + of_node_put(endpoint);
> +
> + lt->host_node = of_graph_get_remote_node(dev->of_node, 0, -1);
> + if (!lt->host_node) {
> + dev_err(lt->dev, "%s: Failed to get remote port\n", __func__);
> + ret = -ENODEV;
> + goto end;
> + }
> +
> + port_node = of_graph_get_remote_node(dev->of_node, 1, -1);
> + if (!port_node) {
> + dev_err(lt->dev, "%s: Failed to get connector port\n", __func__);
> + ret = -ENODEV;
> + goto err_free_host_node;
> + }
> +
> + lt->hdmi_port = of_drm_find_bridge(port_node);
> + if (IS_ERR(lt->hdmi_port)) {
> + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
> + ret = PTR_ERR(lt->hdmi_port);
> + of_node_put(lt->host_node);
> + goto end;
> + }
> +
> + if (!of_device_is_compatible(port_node, "hdmi-connector")) {
> + dev_err(lt->dev, "%s: Failed to get hdmi port\n", __func__);
> + ret = -EINVAL;
> + }
> +
> + of_node_put(port_node);
> +
> +end:
> + return ret;
> +
> +err_free_host_node:
> + of_node_put(lt->host_node);
> + return ret;
> +}
> +
> +static int lt8912_put_dt(struct lt8912 *lt)
> +{
> + of_node_put(lt->host_node);
> + return 0;
> +}
> +
> +static int lt8912_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + static struct lt8912 *lt;
> + int ret = 0;
> + struct device *dev = &client->dev;
> +
> + lt = devm_kzalloc(dev, sizeof(struct lt8912), GFP_KERNEL);
> + if (!lt)
> + return -ENOMEM;
> +
> + lt->dev = dev;
> + lt->i2c_client[0] = client;
> +
> + ret = lt8912_parse_dt(lt);
> + if (ret)
> + goto err_dt_parse;
> +
> + ret = lt8912_init_i2c(lt, client);
> + if (ret)
> + goto err_i2c;
> +
> + i2c_set_clientdata(client, lt);
> +
> + lt->bridge.funcs = &lt8912_bridge_funcs;
> + lt->bridge.of_node = dev->of_node;
> + /*
> + * Here we don't advertise DRM_BRIDGE_OP_HPD because HPD is not
> + * working yet.
> + */
> + lt->bridge.ops = (DRM_BRIDGE_OP_EDID |
> + DRM_BRIDGE_OP_DETECT);
> +
> + drm_bridge_add(&lt->bridge);
> +
> + return 0;
> +
> +err_i2c:
> + lt8912_put_dt(lt);
> +err_dt_parse:
> + return ret;
> +}
> +
> +static int lt8912_remove(struct i2c_client *client)
> +{
> + struct lt8912 *lt = i2c_get_clientdata(client);
> +
> + lt8912_bridge_detach(&lt->bridge);
> + drm_bridge_remove(&lt->bridge);
> + lt8912_free_i2c(lt);
> + lt8912_put_dt(lt);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id lt8912_dt_match[] = {
> + {.compatible = "lontium,lt8912"},
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, lt8912_dt_match);
> +
> +static const struct i2c_device_id lt8912_id[] = {
> + {"lt8912", 0},
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, lt8912_id);
> +
> +static struct i2c_driver lt8912_i2c_driver = {
> + .driver = {
> + .name = "lt8912",
> + .of_match_table = lt8912_dt_match,
> + .owner = THIS_MODULE,
> + },
> + .probe = lt8912_probe,
> + .remove = lt8912_remove,
> + .id_table = lt8912_id,
> +};
> +module_i2c_driver(lt8912_i2c_driver);
> +
> +MODULE_AUTHOR("Adrien Grassein <adrien.grassein@gmail.com>");
> +MODULE_DESCRIPTION("lt8912 drm driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.25.1
>

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