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* [v6 0/5] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20
@ 2021-06-12 12:07 Rajeev Nandan
  2021-06-12 12:07 ` [v6 1/5] drm/panel: add basic DP AUX backlight support Rajeev Nandan
  2021-06-12 12:07 ` [v6 2/5] drm/panel-simple: Support DP AUX backlight Rajeev Nandan
  0 siblings, 2 replies; 4+ messages in thread
From: Rajeev Nandan @ 2021-06-12 12:07 UTC (permalink / raw)
  To: dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: Rajeev Nandan, linux-kernel, thierry.reding, sam, robdclark,
	dianders, lyude, jani.nikula, robh, laurent.pinchart, a.hajda,
	daniel.thompson, hoegsberg, abhinavk, seanpaul, kalyan_t,
	mkrishn, lee.jones, jingoohan1, linux-fbdev

This series adds the support for the eDP panel that needs the backlight
controlling over the DP AUX channel using DPCD registers of the panel
as per the VESA's standard.

This series also adds support for the Samsung eDP AMOLED panel that
needs DP AUX to control the backlight, and introduces new delays in the
@panel_desc.delay to support this panel.

This patch series depends on the following two series:
- Doug's series [1], exposed the DP AUX channel to the panel-simple.
- Lyude's series [2], introduced new drm helper functions for DPCD
  backlight.

This series is the logical successor to the series [3].

Changes in v1:
- Created dpcd backlight helper with very basic functionality, added
  backlight registration in the ti-sn65dsi86 bridge driver.

Changes in v2:
- Created a new DisplayPort aux backlight driver and moved the code from
  drm_dp_aux_backlight.c (v1) to the new driver.

Changes in v3:
- Fixed module compilation (kernel test bot).

Changes in v4:
- Added basic DPCD backlight support in panel-simple.
- Added support for a new Samsung panel ATNA33XC20 that needs DPCD
  backlight controlling and has a requirement of delays between enable
  GPIO and regulator.

Changes in v5:
Addressed review suggestions from Douglas:
- Created a new API drm_panel_dp_aux_backlight() in drm_panel.c
- Moved DP AUX backlight functions from panel-simple.c to drm_panel.c
- panel-simple probe() calls drm_panel_dp_aux_backlight() to create
  backlight when the backlight phandle is not specified in panel DT
  and DP AUX channel is present.
- Added check for drm_edp_backlight_supported() before registering.
- Removed the @uses_dpcd_backlight flag from panel_desc as this
  should be auto-detected.
- Updated comments/descriptions.

Changes in v6:
- Rebased
- Updated wanrning messages, fixed word wrapping in comments.
- Fixed ordering of memory allocation

[1] https://lore.kernel.org/dri-devel/20210525000159.3384921-1-dianders@chromium.org/
[2] https://lore.kernel.org/dri-devel/20210514181504.565252-1-lyude@redhat.com/
[3] https://lore.kernel.org/dri-devel/1619416756-3533-1-git-send-email-rajeevny@codeaurora.org/

Rajeev Nandan (5):
  drm/panel: add basic DP AUX backlight support
  drm/panel-simple: Support DP AUX backlight
  drm/panel-simple: Support for delays between GPIO & regulator
  dt-bindings: display: simple: Add Samsung ATNA33XC20
  drm/panel-simple: Add Samsung ATNA33XC20

 .../bindings/display/panel/panel-simple.yaml       |   2 +
 drivers/gpu/drm/drm_panel.c                        | 108 +++++++++++++++++++++
 drivers/gpu/drm/panel/panel-simple.c               |  67 +++++++++++++
 include/drm/drm_panel.h                            |  15 ++-
 4 files changed, 188 insertions(+), 4 deletions(-)

-- 
2.7.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [v6 1/5] drm/panel: add basic DP AUX backlight support
  2021-06-12 12:07 [v6 0/5] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20 Rajeev Nandan
@ 2021-06-12 12:07 ` Rajeev Nandan
  2021-06-16 19:22   ` Lyude Paul
  2021-06-12 12:07 ` [v6 2/5] drm/panel-simple: Support DP AUX backlight Rajeev Nandan
  1 sibling, 1 reply; 4+ messages in thread
From: Rajeev Nandan @ 2021-06-12 12:07 UTC (permalink / raw)
  To: dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: Rajeev Nandan, linux-kernel, thierry.reding, sam, robdclark,
	dianders, lyude, jani.nikula, robh, laurent.pinchart, a.hajda,
	daniel.thompson, hoegsberg, abhinavk, seanpaul, kalyan_t,
	mkrishn, lee.jones, jingoohan1, linux-fbdev

Some panels support backlight control over DP AUX channel using
VESA's standard backlight control interface.
Using new DRM eDP backlight helpers, add support to create and
register a backlight for those panels in drm_panel to simplify
the panel drivers.

The panel driver with access to "struct drm_dp_aux" can create and
register a backlight device using following code snippet in its
probe() function:

	err = drm_panel_dp_aux_backlight(panel, aux);
	if (err)
		return err;

Then drm_panel will handle backlight_(enable|disable) calls
similar to the case when drm_panel_of_backlight() is used.

Currently, we are not supporting one feature where the source
device can combine the backlight brightness levels set through
DP AUX and the BL_PWM_DIM eDP connector pin. Since it's not
required for the basic backlight controls, it can be added later.

Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---

Changes in v5:
- New

Changes in v6:
- Fixed ordering of memory allocation (Douglas)
- Updated word wrapping in a comment (Douglas)

 drivers/gpu/drm/drm_panel.c | 108 ++++++++++++++++++++++++++++++++++++++++++++
 include/drm/drm_panel.h     |  15 ++++--
 2 files changed, 119 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
index f634371..9e65342 100644
--- a/drivers/gpu/drm/drm_panel.c
+++ b/drivers/gpu/drm/drm_panel.c
@@ -26,12 +26,20 @@
 #include <linux/module.h>
 
 #include <drm/drm_crtc.h>
+#include <drm/drm_dp_helper.h>
 #include <drm/drm_panel.h>
 #include <drm/drm_print.h>
 
 static DEFINE_MUTEX(panel_lock);
 static LIST_HEAD(panel_list);
 
+struct dp_aux_backlight {
+	struct backlight_device *base;
+	struct drm_dp_aux *aux;
+	struct drm_edp_backlight_info info;
+	bool enabled;
+};
+
 /**
  * DOC: drm panel
  *
@@ -342,6 +350,106 @@ int drm_panel_of_backlight(struct drm_panel *panel)
 	return 0;
 }
 EXPORT_SYMBOL(drm_panel_of_backlight);
+
+static int dp_aux_backlight_update_status(struct backlight_device *bd)
+{
+	struct dp_aux_backlight *bl = bl_get_data(bd);
+	u16 brightness = backlight_get_brightness(bd);
+	int ret = 0;
+
+	if (brightness > 0) {
+		if (!bl->enabled) {
+			drm_edp_backlight_enable(bl->aux, &bl->info, brightness);
+			bl->enabled = true;
+			return 0;
+		}
+		ret = drm_edp_backlight_set_level(bl->aux, &bl->info, brightness);
+	} else {
+		if (bl->enabled) {
+			drm_edp_backlight_disable(bl->aux, &bl->info);
+			bl->enabled = false;
+		}
+	}
+
+	return ret;
+}
+
+static const struct backlight_ops dp_aux_bl_ops = {
+	.update_status = dp_aux_backlight_update_status,
+};
+
+/**
+ * drm_panel_dp_aux_backlight - create and use DP AUX backlight
+ * @panel: DRM panel
+ * @aux: The DP AUX channel to use
+ *
+ * Use this function to create and handle backlight if your panel
+ * supports backlight control over DP AUX channel using DPCD
+ * registers as per VESA's standard backlight control interface.
+ *
+ * When the panel is enabled backlight will be enabled after a
+ * successful call to &drm_panel_funcs.enable()
+ *
+ * When the panel is disabled backlight will be disabled before the
+ * call to &drm_panel_funcs.disable().
+ *
+ * A typical implementation for a panel driver supporting backlight
+ * control over DP AUX will call this function at probe time.
+ * Backlight will then be handled transparently without requiring
+ * any intervention from the driver.
+ *
+ * drm_panel_dp_aux_backlight() must be called after the call to drm_panel_init().
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux)
+{
+	struct dp_aux_backlight *bl;
+	struct backlight_properties props = { 0 };
+	u16 current_level;
+	u8 current_mode;
+	u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
+	int ret;
+
+	if (!panel || !panel->dev || !aux)
+		return -EINVAL;
+
+	ret = drm_dp_dpcd_read(aux, DP_EDP_DPCD_REV, edp_dpcd,
+			       EDP_DISPLAY_CTL_CAP_SIZE);
+	if (ret < 0)
+		return ret;
+
+	if (!drm_edp_backlight_supported(edp_dpcd)) {
+		DRM_DEV_INFO(panel->dev, "DP AUX backlight is not supported\n");
+		return 0;
+	}
+
+	bl = devm_kzalloc(panel->dev, sizeof(*bl), GFP_KERNEL);
+	if (!bl)
+		return -ENOMEM;
+
+	bl->aux = aux;
+
+	ret = drm_edp_backlight_init(aux, &bl->info, 0, edp_dpcd,
+				     &current_level, &current_mode);
+	if (ret < 0)
+		return ret;
+
+	props.type = BACKLIGHT_RAW;
+	props.brightness = current_level;
+	props.max_brightness = bl->info.max;
+
+	bl->base = devm_backlight_device_register(panel->dev, "dp_aux_backlight",
+						  panel->dev, bl,
+						  &dp_aux_bl_ops, &props);
+	if (IS_ERR(bl->base))
+		return PTR_ERR(bl->base);
+
+	panel->backlight = bl->base;
+
+	return 0;
+}
+EXPORT_SYMBOL(drm_panel_dp_aux_backlight);
 #endif
 
 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
index 33605c3..3ebfaa6 100644
--- a/include/drm/drm_panel.h
+++ b/include/drm/drm_panel.h
@@ -32,6 +32,7 @@ struct backlight_device;
 struct device_node;
 struct drm_connector;
 struct drm_device;
+struct drm_dp_aux;
 struct drm_panel;
 struct display_timing;
 
@@ -64,8 +65,8 @@ enum drm_panel_orientation;
  * the panel. This is the job of the .unprepare() function.
  *
  * Backlight can be handled automatically if configured using
- * drm_panel_of_backlight(). Then the driver does not need to implement the
- * functionality to enable/disable backlight.
+ * drm_panel_of_backlight() or drm_panel_dp_aux_backlight(). Then the driver
+ * does not need to implement the functionality to enable/disable backlight.
  */
 struct drm_panel_funcs {
 	/**
@@ -144,8 +145,8 @@ struct drm_panel {
 	 * Backlight device, used to turn on backlight after the call
 	 * to enable(), and to turn off backlight before the call to
 	 * disable().
-	 * backlight is set by drm_panel_of_backlight() and drivers
-	 * shall not assign it.
+	 * backlight is set by drm_panel_of_backlight() or
+	 * drm_panel_dp_aux_backlight() and drivers shall not assign it.
 	 */
 	struct backlight_device *backlight;
 
@@ -208,11 +209,17 @@ static inline int of_drm_get_panel_orientation(const struct device_node *np,
 #if IS_ENABLED(CONFIG_DRM_PANEL) && (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
 	(IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
 int drm_panel_of_backlight(struct drm_panel *panel);
+int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux *aux);
 #else
 static inline int drm_panel_of_backlight(struct drm_panel *panel)
 {
 	return 0;
 }
+static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel,
+					     struct drm_dp_aux *aux)
+{
+	return 0;
+}
 #endif
 
 #endif
-- 
2.7.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

* [v6 2/5] drm/panel-simple: Support DP AUX backlight
  2021-06-12 12:07 [v6 0/5] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20 Rajeev Nandan
  2021-06-12 12:07 ` [v6 1/5] drm/panel: add basic DP AUX backlight support Rajeev Nandan
@ 2021-06-12 12:07 ` Rajeev Nandan
  1 sibling, 0 replies; 4+ messages in thread
From: Rajeev Nandan @ 2021-06-12 12:07 UTC (permalink / raw)
  To: dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: Rajeev Nandan, linux-kernel, thierry.reding, sam, robdclark,
	dianders, lyude, jani.nikula, robh, laurent.pinchart, a.hajda,
	daniel.thompson, hoegsberg, abhinavk, seanpaul, kalyan_t,
	mkrishn, lee.jones, jingoohan1, linux-fbdev

If there is no backlight specified in the device tree and the panel
has access to the DP AUX channel then create a DP AUX backlight if
supported by the panel.

Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
---

(no changes since v5)

This patch depends on the previous patch (2/5) of this series.

Changes in v4:
- New

Changes in v5:
- Address review comments and move backlight functions to drm_panel.c (Douglas)
- Create and register DP AUX backlight if there is no backlight specified in the
  device tree and panel has the DP AUX channel. (Douglas)
- The new drm_panel_dp_aux_backlight() will do the drm_edp_backlight_supported() check.

 drivers/gpu/drm/panel/panel-simple.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index df6fbd1..26555ec 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -800,6 +800,12 @@ static int panel_simple_probe(struct device *dev, const struct panel_desc *desc,
 	if (err)
 		goto disable_pm_runtime;
 
+	if (!panel->base.backlight && panel->aux) {
+		err = drm_panel_dp_aux_backlight(&panel->base, panel->aux);
+		if (err)
+			goto disable_pm_runtime;
+	}
+
 	drm_panel_add(&panel->base);
 
 	return 0;
-- 
2.7.4


^ permalink raw reply	[flat|nested] 4+ messages in thread

* Re: [v6 1/5] drm/panel: add basic DP AUX backlight support
  2021-06-12 12:07 ` [v6 1/5] drm/panel: add basic DP AUX backlight support Rajeev Nandan
@ 2021-06-16 19:22   ` Lyude Paul
  0 siblings, 0 replies; 4+ messages in thread
From: Lyude Paul @ 2021-06-16 19:22 UTC (permalink / raw)
  To: Rajeev Nandan, dri-devel, linux-arm-msm, freedreno, devicetree
  Cc: linux-kernel, thierry.reding, sam, robdclark, dianders,
	jani.nikula, robh, laurent.pinchart, a.hajda, daniel.thompson,
	hoegsberg, abhinavk, seanpaul, kalyan_t, mkrishn, lee.jones,
	jingoohan1, linux-fbdev

Reviewed-by: Lyude Paul <lyude@redhat.com>

On Sat, 2021-06-12 at 17:37 +0530, Rajeev Nandan wrote:
> Some panels support backlight control over DP AUX channel using
> VESA's standard backlight control interface.
> Using new DRM eDP backlight helpers, add support to create and
> register a backlight for those panels in drm_panel to simplify
> the panel drivers.
> 
> The panel driver with access to "struct drm_dp_aux" can create and
> register a backlight device using following code snippet in its
> probe() function:
> 
>         err = drm_panel_dp_aux_backlight(panel, aux);
>         if (err)
>                 return err;
> 
> Then drm_panel will handle backlight_(enable|disable) calls
> similar to the case when drm_panel_of_backlight() is used.
> 
> Currently, we are not supporting one feature where the source
> device can combine the backlight brightness levels set through
> DP AUX and the BL_PWM_DIM eDP connector pin. Since it's not
> required for the basic backlight controls, it can be added later.
> 
> Signed-off-by: Rajeev Nandan <rajeevny@codeaurora.org>
> Reviewed-by: Douglas Anderson <dianders@chromium.org>
> ---
> 
> Changes in v5:
> - New
> 
> Changes in v6:
> - Fixed ordering of memory allocation (Douglas)
> - Updated word wrapping in a comment (Douglas)
> 
>  drivers/gpu/drm/drm_panel.c | 108
> ++++++++++++++++++++++++++++++++++++++++++++
>  include/drm/drm_panel.h     |  15 ++++--
>  2 files changed, 119 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c
> index f634371..9e65342 100644
> --- a/drivers/gpu/drm/drm_panel.c
> +++ b/drivers/gpu/drm/drm_panel.c
> @@ -26,12 +26,20 @@
>  #include <linux/module.h>
>  
>  #include <drm/drm_crtc.h>
> +#include <drm/drm_dp_helper.h>
>  #include <drm/drm_panel.h>
>  #include <drm/drm_print.h>
>  
>  static DEFINE_MUTEX(panel_lock);
>  static LIST_HEAD(panel_list);
>  
> +struct dp_aux_backlight {
> +       struct backlight_device *base;
> +       struct drm_dp_aux *aux;
> +       struct drm_edp_backlight_info info;
> +       bool enabled;
> +};
> +
>  /**
>   * DOC: drm panel
>   *
> @@ -342,6 +350,106 @@ int drm_panel_of_backlight(struct drm_panel *panel)
>         return 0;
>  }
>  EXPORT_SYMBOL(drm_panel_of_backlight);
> +
> +static int dp_aux_backlight_update_status(struct backlight_device *bd)
> +{
> +       struct dp_aux_backlight *bl = bl_get_data(bd);
> +       u16 brightness = backlight_get_brightness(bd);
> +       int ret = 0;
> +
> +       if (brightness > 0) {
> +               if (!bl->enabled) {
> +                       drm_edp_backlight_enable(bl->aux, &bl->info,
> brightness);
> +                       bl->enabled = true;
> +                       return 0;
> +               }
> +               ret = drm_edp_backlight_set_level(bl->aux, &bl->info,
> brightness);
> +       } else {
> +               if (bl->enabled) {
> +                       drm_edp_backlight_disable(bl->aux, &bl->info);
> +                       bl->enabled = false;
> +               }
> +       }
> +
> +       return ret;
> +}
> +
> +static const struct backlight_ops dp_aux_bl_ops = {
> +       .update_status = dp_aux_backlight_update_status,
> +};
> +
> +/**
> + * drm_panel_dp_aux_backlight - create and use DP AUX backlight
> + * @panel: DRM panel
> + * @aux: The DP AUX channel to use
> + *
> + * Use this function to create and handle backlight if your panel
> + * supports backlight control over DP AUX channel using DPCD
> + * registers as per VESA's standard backlight control interface.
> + *
> + * When the panel is enabled backlight will be enabled after a
> + * successful call to &drm_panel_funcs.enable()
> + *
> + * When the panel is disabled backlight will be disabled before the
> + * call to &drm_panel_funcs.disable().
> + *
> + * A typical implementation for a panel driver supporting backlight
> + * control over DP AUX will call this function at probe time.
> + * Backlight will then be handled transparently without requiring
> + * any intervention from the driver.
> + *
> + * drm_panel_dp_aux_backlight() must be called after the call to
> drm_panel_init().
> + *
> + * Return: 0 on success or a negative error code on failure.
> + */
> +int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux
> *aux)
> +{
> +       struct dp_aux_backlight *bl;
> +       struct backlight_properties props = { 0 };
> +       u16 current_level;
> +       u8 current_mode;
> +       u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
> +       int ret;
> +
> +       if (!panel || !panel->dev || !aux)
> +               return -EINVAL;
> +
> +       ret = drm_dp_dpcd_read(aux, DP_EDP_DPCD_REV, edp_dpcd,
> +                              EDP_DISPLAY_CTL_CAP_SIZE);
> +       if (ret < 0)
> +               return ret;
> +
> +       if (!drm_edp_backlight_supported(edp_dpcd)) {
> +               DRM_DEV_INFO(panel->dev, "DP AUX backlight is not
> supported\n");
> +               return 0;
> +       }
> +
> +       bl = devm_kzalloc(panel->dev, sizeof(*bl), GFP_KERNEL);
> +       if (!bl)
> +               return -ENOMEM;
> +
> +       bl->aux = aux;
> +
> +       ret = drm_edp_backlight_init(aux, &bl->info, 0, edp_dpcd,
> +                                    &current_level, &current_mode);
> +       if (ret < 0)
> +               return ret;
> +
> +       props.type = BACKLIGHT_RAW;
> +       props.brightness = current_level;
> +       props.max_brightness = bl->info.max;
> +
> +       bl->base = devm_backlight_device_register(panel->dev,
> "dp_aux_backlight",
> +                                                 panel->dev, bl,
> +                                                 &dp_aux_bl_ops, &props);
> +       if (IS_ERR(bl->base))
> +               return PTR_ERR(bl->base);
> +
> +       panel->backlight = bl->base;
> +
> +       return 0;
> +}
> +EXPORT_SYMBOL(drm_panel_dp_aux_backlight);
>  #endif
>  
>  MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
> diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h
> index 33605c3..3ebfaa6 100644
> --- a/include/drm/drm_panel.h
> +++ b/include/drm/drm_panel.h
> @@ -32,6 +32,7 @@ struct backlight_device;
>  struct device_node;
>  struct drm_connector;
>  struct drm_device;
> +struct drm_dp_aux;
>  struct drm_panel;
>  struct display_timing;
>  
> @@ -64,8 +65,8 @@ enum drm_panel_orientation;
>   * the panel. This is the job of the .unprepare() function.
>   *
>   * Backlight can be handled automatically if configured using
> - * drm_panel_of_backlight(). Then the driver does not need to implement the
> - * functionality to enable/disable backlight.
> + * drm_panel_of_backlight() or drm_panel_dp_aux_backlight(). Then the
> driver
> + * does not need to implement the functionality to enable/disable
> backlight.
>   */
>  struct drm_panel_funcs {
>         /**
> @@ -144,8 +145,8 @@ struct drm_panel {
>          * Backlight device, used to turn on backlight after the call
>          * to enable(), and to turn off backlight before the call to
>          * disable().
> -        * backlight is set by drm_panel_of_backlight() and drivers
> -        * shall not assign it.
> +        * backlight is set by drm_panel_of_backlight() or
> +        * drm_panel_dp_aux_backlight() and drivers shall not assign it.
>          */
>         struct backlight_device *backlight;
>  
> @@ -208,11 +209,17 @@ static inline int of_drm_get_panel_orientation(const
> struct device_node *np,
>  #if IS_ENABLED(CONFIG_DRM_PANEL) &&
> (IS_BUILTIN(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
>         (IS_MODULE(CONFIG_DRM) && IS_MODULE(CONFIG_BACKLIGHT_CLASS_DEVICE)))
>  int drm_panel_of_backlight(struct drm_panel *panel);
> +int drm_panel_dp_aux_backlight(struct drm_panel *panel, struct drm_dp_aux
> *aux);
>  #else
>  static inline int drm_panel_of_backlight(struct drm_panel *panel)
>  {
>         return 0;
>  }
> +static inline int drm_panel_dp_aux_backlight(struct drm_panel *panel,
> +                                            struct drm_dp_aux *aux)
> +{
> +       return 0;
> +}
>  #endif
>  
>  #endif

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat


^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2021-06-16 19:22 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-06-12 12:07 [v6 0/5] drm: Support basic DPCD backlight in panel-simple and add a new panel ATNA33XC20 Rajeev Nandan
2021-06-12 12:07 ` [v6 1/5] drm/panel: add basic DP AUX backlight support Rajeev Nandan
2021-06-16 19:22   ` Lyude Paul
2021-06-12 12:07 ` [v6 2/5] drm/panel-simple: Support DP AUX backlight Rajeev Nandan

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