Add support to control the backlight of the eDP panel connected to the ti-sn65dsi86 bridge through aux channel.
Signed-off-by: Rajeev Nandan rajeevny@codeaurora.org --- drivers/gpu/drm/bridge/Kconfig | 1 + drivers/gpu/drm/bridge/ti-sn65dsi86.c | 26 ++++++++++++++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index e4110d6..e556ec22 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -239,6 +239,7 @@ config DRM_TI_SN65DSI86 select REGMAP_I2C select DRM_PANEL select DRM_MIPI_DSI + select DRM_DP_AUX_BACKLIGHT help Texas Instruments SN65DSI86 DSI to eDP Bridge driver
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index f27306c..813d067 100644 --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c @@ -22,6 +22,7 @@ #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_bridge.h> +#include <drm/drm_dp_aux_backlight.h> #include <drm/drm_dp_helper.h> #include <drm/drm_mipi_dsi.h> #include <drm/drm_of.h> @@ -126,6 +127,7 @@ * @panel: Our panel. * @enable_gpio: The GPIO we toggle to enable the bridge. * @supplies: Data for bulk enabling/disabling our regulators. + * @backlight: The DP aux backlight device. * @dp_lanes: Count of dp_lanes we're using. * @ln_assign: Value to program to the LN_ASSIGN register. * @ln_polrs: Value for the 4-bit LN_POLRS field of SN_ENH_FRAME_REG. @@ -154,6 +156,7 @@ struct ti_sn_bridge { struct drm_panel *panel; struct gpio_desc *enable_gpio; struct regulator_bulk_data supplies[SN_REGULATOR_SUPPLY_NUM]; + struct drm_dp_aux_backlight *backlight; int dp_lanes; u8 ln_assign; u8 ln_polrs; @@ -431,6 +434,8 @@ static void ti_sn_bridge_disable(struct drm_bridge *bridge) { struct ti_sn_bridge *pdata = bridge_to_ti_sn_bridge(bridge);
+ drm_dp_aux_backlight_disable(pdata->backlight); + drm_panel_disable(pdata->panel);
/* disable video stream */ @@ -819,6 +824,8 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge) VSTREAM_ENABLE);
drm_panel_enable(pdata->panel); + + drm_dp_aux_backlight_enable(pdata->backlight); }
static void ti_sn_bridge_pre_enable(struct drm_bridge *bridge) @@ -1215,6 +1222,7 @@ static int ti_sn_bridge_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct ti_sn_bridge *pdata; + struct drm_dp_aux_backlight *aux_bl; int ret;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { @@ -1294,9 +1302,27 @@ static int ti_sn_bridge_probe(struct i2c_client *client,
drm_bridge_add(&pdata->bridge);
+ if (of_find_property(pdata->dev->of_node, "use-aux-backlight", NULL)) { + aux_bl = devm_kzalloc(pdata->dev, sizeof(*aux_bl), GFP_KERNEL); + if (!aux_bl) { + ret = -ENOMEM; + goto out; + } + aux_bl->dev = pdata->dev; + aux_bl->aux = &pdata->aux; + ret = drm_dp_aux_backlight_register("ti-sn-aux-backlight", aux_bl); + if (ret) + goto out; + pdata->backlight = aux_bl; + } + ti_sn_debugfs_init(pdata);
return 0; + +out: + pm_runtime_disable(pdata->dev); + return ret; }
static int ti_sn_bridge_remove(struct i2c_client *client)