drm/i915: Allow "max bpc" property to limit pipe_bpp
Use the newly added "max bpc" connector property to limit pipe bpp.
V3: Use drm_connector_state to access the "max bpc" property
V4: Initialize the drm property, add suuport to DP(Ville)
V5: Use the property in the connector and fix CI failure(Ville)
V6: Use the core function to attach max_bpc property, remove the redundant
clamping of pipe bpp based on connector info
V7: Fix Checkpatch warnings
V9: Cleanup connected_sink_max_bpp and fix initial value in DP(Ville)
V12: Fix debug message(Ville)
V13: Remove the redundant check and simplify the check logic(Stan)
V14: Fix the check in connected_sink_max_bpp(Stan)
v15 (From Manasi): Add missing break (Stan)
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Kishore Kadiyala <kishore.kadiyala@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Cc: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181023014400.16055-1-manasi.d.navare@intel.com
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b219d58..31fbf67 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -10928,30 +10928,38 @@ static void intel_modeset_update_connector_atomic_state(struct drm_device *dev)
drm_connector_list_iter_end(&conn_iter);
}
-static void
-connected_sink_compute_bpp(struct intel_connector *connector,
- struct intel_crtc_state *pipe_config)
+static int
+connected_sink_max_bpp(const struct drm_connector_state *conn_state,
+ struct intel_crtc_state *pipe_config)
{
- const struct drm_display_info *info = &connector->base.display_info;
- int bpp = pipe_config->pipe_bpp;
+ int bpp;
+ struct drm_display_info *info = &conn_state->connector->display_info;
- DRM_DEBUG_KMS("[CONNECTOR:%d:%s] checking for sink bpp constrains\n",
- connector->base.base.id,
- connector->base.name);
-
- /* Don't use an invalid EDID bpc value */
- if (info->bpc != 0 && info->bpc * 3 < bpp) {
- DRM_DEBUG_KMS("clamping display bpp (was %d) to EDID reported max of %d\n",
- bpp, info->bpc * 3);
- pipe_config->pipe_bpp = info->bpc * 3;
+ switch (conn_state->max_bpc) {
+ case 6 ... 7:
+ bpp = 6 * 3;
+ break;
+ case 8 ... 9:
+ bpp = 8 * 3;
+ break;
+ case 10 ... 11:
+ bpp = 10 * 3;
+ break;
+ case 12:
+ bpp = 12 * 3;
+ break;
+ default:
+ return -EINVAL;
}
- /* Clamp bpp to 8 on screens without EDID 1.4 */
- if (info->bpc == 0 && bpp > 24) {
- DRM_DEBUG_KMS("clamping display bpp (was %d) to default limit of 24\n",
- bpp);
- pipe_config->pipe_bpp = 24;
+ if (bpp < pipe_config->pipe_bpp) {
+ DRM_DEBUG_KMS("Limiting display bpp to %d instead of Edid bpp "
+ "%d, requested bpp %d, max platform bpp %d\n", bpp,
+ 3 * info->bpc, 3 * conn_state->max_requested_bpc,
+ pipe_config->pipe_bpp);
+ pipe_config->pipe_bpp = bpp;
}
+ return 0;
}
static int
@@ -10982,8 +10990,8 @@ compute_baseline_pipe_bpp(struct intel_crtc *crtc,
if (connector_state->crtc != &crtc->base)
continue;
- connected_sink_compute_bpp(to_intel_connector(connector),
- pipe_config);
+ if (connected_sink_max_bpp(connector_state, pipe_config) < 0)
+ return -EINVAL;
}
return bpp;