[PATCH v11 06/12] drm/bridge: add connector luminance operations

["Mario Limonciello (AMD)" <superm1@kernel.org>]

From: Mario Limonciello <mario.limonciello@amd.com>

Allow bridges that own brightness control to advertise a luminance
operation and its supported relative range.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
---
v11:
 * Drop panel bridge declarations re-added by a bad rebase (Sashiko)
 * Document @luminance as the initial level
v10:
 * Split bridge operations out of the combined panel and bridge patch
---
 include/drm/drm_bridge.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/include/drm/drm_bridge.h b/include/drm/drm_bridge.h
index 1981d24a700d2..240a69c1233e7 100644
--- a/include/drm/drm_bridge.h
+++ b/include/drm/drm_bridge.h
@@ -62,6 +62,15 @@ enum drm_bridge_attach_flags {
  * struct drm_bridge_funcs - drm_bridge control functions
  */
 struct drm_bridge_funcs {
+	/**
+	 * @set_luminance:
+	 *
+	 * Apply a relative luminance level to a bridge that controls panel
+	 * emission. Bridges implementing this callback shall set
+	 * @DRM_BRIDGE_OP_LUMINANCE.
+	 */
+	void (*set_luminance)(struct drm_bridge *bridge, unsigned int luminance);
+
 	/**
 	 * @attach:
 	 *
@@ -1021,6 +1030,11 @@ enum drm_bridge_ops {
 	 * &drm_bridge_funcs->hdmi_clear_spd_infoframe callbacks.
 	 */
 	DRM_BRIDGE_OP_HDMI_SPD_INFOFRAME = BIT(10),
+
+	/**
+	 * @DRM_BRIDGE_OP_LUMINANCE: The bridge controls panel luminance.
+	 */
+	DRM_BRIDGE_OP_LUMINANCE = BIT(11),
 };
 
 /**
@@ -1071,6 +1085,12 @@ struct drm_bridge {
 	void *driver_private;
 	/** @ops: bitmask of operations supported by the bridge */
 	enum drm_bridge_ops ops;
+
+	/** @luminance_max: Maximum relative luminance level. */
+	unsigned int luminance_max;
+
+	/** @luminance: Initial relative luminance level. */
+	unsigned int luminance;
 	/**
 	 * @type: Type of the connection at the bridge output
 	 * (DRM_MODE_CONNECTOR_*). For bridges at the end of this chain this

-- 
2.53.0