linux-kernel - [PATCH v2 3/7] drm/amd/display: Add handling for new "active bpc" property

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Date:   Tue,  8 Jun 2021 19:43:16 +0200
From:   Werner Sembach <wse@...edocomputers.com>
To:     harry.wentland@....com, sunpeng.li@....com,
        alexander.deucher@....com, christian.koenig@....com,
        airlied@...ux.ie, daniel@...ll.ch,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, jani.nikula@...ux.intel.com,
        joonas.lahtinen@...ux.intel.com, rodrigo.vivi@...el.com,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org
Cc:     Werner Sembach <wse@...edocomputers.com>
Subject: [PATCH v2 3/7] drm/amd/display: Add handling for new "active bpc" property

This commit implements the "active bpc" drm property for the AMD GPU driver.

Signed-off-by: Werner Sembach <wse@...edocomputers.com>
---
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c  | 18 +++++++++++++++++-
 .../display/amdgpu_dm/amdgpu_dm_mst_types.c    |  4 +++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index dbbccbed7b20..e57b2b743d36 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -7519,8 +7519,10 @@ void amdgpu_dm_connector_init_helper(struct amdgpu_display_manager *dm,
 				adev->mode_info.underscan_vborder_property,
 				0);
 
-	if (!aconnector->mst_port)
+	if (!aconnector->mst_port) {
 		drm_connector_attach_max_bpc_property(&aconnector->base, 8, 16);
+		drm_connector_attach_active_bpc_property(&aconnector->base, 8, 16);
+	}
 
 	/* This defaults to the max in the range, but we want 8bpc for non-edp. */
 	aconnector->base.state->max_bpc = (connector_type == DRM_MODE_CONNECTOR_eDP) ? 16 : 8;
@@ -8890,6 +8892,20 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
 		mutex_unlock(&dm->dc_lock);
 	}
 
+	/* Extract information from crtc to communicate it to userspace as connector properties */
+	for_each_new_connector_in_state(state, connector, new_con_state, i) {
+		struct drm_crtc *crtc = new_con_state->crtc;
+		if (crtc) {
+			new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+			dm_new_crtc_state = to_dm_crtc_state(new_crtc_state);
+			if (dm_new_crtc_state->stream)
+				new_con_state->active_bpc = convert_dc_color_depth_into_bpc(
+					dm_new_crtc_state->stream->timing.display_color_depth);
+		}
+		else
+			new_con_state->active_bpc = 0;
+	}
+
 	/* Count number of newly disabled CRTCs for dropping PM refs later. */
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state,
 				      new_crtc_state, i) {
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 9b221db526dc..2a8dc6b2c6c7 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -397,8 +397,10 @@ dm_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
 	}
 
 	connector->max_bpc_property = master->base.max_bpc_property;
-	if (connector->max_bpc_property)
+	if (connector->max_bpc_property) {
 		drm_connector_attach_max_bpc_property(connector, 8, 16);
+		drm_connector_attach_active_bpc_property(&aconnector->base, 8, 16);
+	}
 
 	connector->vrr_capable_property = master->base.vrr_capable_property;
 	if (connector->vrr_capable_property)
-- 
2.25.1