drm/amd: Add power_saving_policy drm property to eDP connectors

When the `power_saving_policy` property is set to bit mask
"Require color accuracy" ABM should be disabled immediately and
any requests by sysfs to update will return an -EBUSY error.

When the `power_saving_policy` property is set to bit mask
"Require low latency" PSR should be disabled.

When the property is restored to an empty bit mask ABM and PSR
can be enabled again.
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Reviewed-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240703051722.328-3-mario.limonciello@amd.com

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

@@ -1350,6 +1350,10 @@ int amdgpu_display_modeset_create_props(struct amdgpu_device *adev)
 					 "dither",
 					 amdgpu_dither_enum_list, sz);
 
+	if (adev->dc_enabled)
+		drm_mode_create_power_saving_policy_property(adev_to_drm(adev),
+							     DRM_MODE_POWER_SAVING_POLICY_ALL);
+
 	return 0;
 }
 

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -6436,6 +6436,14 @@ int amdgpu_dm_connector_atomic_set_property(struct drm_connector *connector,
 	} else if (property == adev->mode_info.underscan_property) {
 		dm_new_state->underscan_enable = val;
 		ret = 0;
+	} else if (property == dev->mode_config.power_saving_policy) {
+		dm_new_state->abm_forbidden = val & DRM_MODE_REQUIRE_COLOR_ACCURACY;
+		dm_new_state->abm_level = (dm_new_state->abm_forbidden ||
+					   !dm_old_state->abm_level) ?
+						ABM_LEVEL_IMMEDIATE_DISABLE :
+						dm_old_state->abm_level;
+		dm_new_state->psr_forbidden = val & DRM_MODE_REQUIRE_LOW_LATENCY;
+		ret = 0;
 	}
 
 	return ret;
@@ -6478,6 +6486,13 @@ int amdgpu_dm_connector_atomic_get_property(struct drm_connector *connector,
 	} else if (property == adev->mode_info.underscan_property) {
 		*val = dm_state->underscan_enable;
 		ret = 0;
+	} else if (property == dev->mode_config.power_saving_policy) {
+		*val = 0;
+		if (dm_state->psr_forbidden)
+			*val |= DRM_MODE_REQUIRE_LOW_LATENCY;
+		if (dm_state->abm_forbidden)
+			*val |= DRM_MODE_REQUIRE_COLOR_ACCURACY;
+		ret = 0;
 	}
 
 	return ret;
@@ -6504,9 +6519,12 @@ static ssize_t panel_power_savings_show(struct device *device,
 	u8 val;
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-	val = to_dm_connector_state(connector->state)->abm_level ==
-		ABM_LEVEL_IMMEDIATE_DISABLE ? 0 :
-		to_dm_connector_state(connector->state)->abm_level;
+	if (to_dm_connector_state(connector->state)->abm_forbidden)
+		val = 0;
+	else
+		val = to_dm_connector_state(connector->state)->abm_level ==
+			ABM_LEVEL_IMMEDIATE_DISABLE ? 0 :
+			to_dm_connector_state(connector->state)->abm_level;
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
 
 	return sysfs_emit(buf, "%u\n", val);
@@ -6530,10 +6548,16 @@ static ssize_t panel_power_savings_store(struct device *device,
 		return -EINVAL;
 
 	drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
-	to_dm_connector_state(connector->state)->abm_level = val ?:
-		ABM_LEVEL_IMMEDIATE_DISABLE;
+	if (to_dm_connector_state(connector->state)->abm_forbidden)
+		ret = -EBUSY;
+	else
+		to_dm_connector_state(connector->state)->abm_level = val ?:
+			ABM_LEVEL_IMMEDIATE_DISABLE;
 	drm_modeset_unlock(&dev->mode_config.connection_mutex);
 
+	if (ret)
+		return ret;
+
 	drm_kms_helper_hotplug_event(dev);
 
 	return count;
@@ -7704,6 +7728,14 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 	aconnector->base.state->max_bpc = 16;
 	aconnector->base.state->max_requested_bpc = aconnector->base.state->max_bpc;
 
+	if (connector_type == DRM_MODE_CONNECTOR_eDP &&
+	    (dc_is_dmcu_initialized(adev->dm.dc) ||
+	     adev->dm.dc->ctx->dmub_srv)) {
+		drm_object_attach_property(&aconnector->base.base,
+					   dm->ddev->mode_config.power_saving_policy,
+					   0);
+	}
+
 	if (connector_type == DRM_MODE_CONNECTOR_HDMIA) {
 		/* Content Type is currently only implemented for HDMI. */
 		drm_connector_attach_content_type_property(&aconnector->base);
@@ -9307,6 +9339,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 	for_each_oldnew_connector_in_state(state, connector, old_con_state, new_con_state, i) {
 		struct dm_connector_state *dm_new_con_state = to_dm_connector_state(new_con_state);
 		struct dm_connector_state *dm_old_con_state = to_dm_connector_state(old_con_state);
+		struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
 		struct amdgpu_crtc *acrtc = to_amdgpu_crtc(dm_new_con_state->base.crtc);
 		struct dc_surface_update *dummy_updates;
 		struct dc_stream_update stream_update;
@@ -9360,6 +9393,15 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 			stream_update.hdr_static_metadata = &hdr_packet;
 		}
 
+		aconnector->disallow_edp_enter_psr = dm_new_con_state->psr_forbidden;
+
+		/* immediately disable PSR if disallowed */
+		if (aconnector->disallow_edp_enter_psr) {
+			mutex_lock(&dm->dc_lock);
+			amdgpu_dm_psr_disable(dm_new_crtc_state->stream);
+			mutex_unlock(&dm->dc_lock);
+		}
+
 		status = dc_stream_get_status(dm_new_crtc_state->stream);
 
 		if (WARN_ON(!status))

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h

@@ -873,6 +873,8 @@ struct dm_connector_state {
 	bool underscan_enable;
 	bool freesync_capable;
 	bool update_hdcp;
+	bool abm_forbidden;
+	bool psr_forbidden;
 	uint8_t abm_level;
 	int vcpi_slots;
 	uint64_t pbn;