drm/radeon: hdmi deep color modes must obey clock limit of sink.

Make sure that a hdmi deep color mode can't exceed the max tmds
clock limit of a hdmi sink if such a limit is defined by edid.

If requested deep color bpc would exceed the limit given the mode
to be set, try to degrade gracefully to lower supported deep color
bpc or to standard 8 bpc if needed.

Signed-off-by: Mario Kleiner <mario.kleiner.de@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

3 files changed, 35 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 76c30f2da3fb..26c12a3fe430 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -962,6 +962,9 @@ static bool atombios_crtc_prepare_pll(struct drm_crtc *crtc, struct drm_display_
                 struct radeon_connector_atom_dig *dig_connector =
                         radeon_connector->con_priv;
                 int dp_clock;
+
+                /* Assign mode clock for hdmi deep color max clock limit check */
+                radeon_connector->pixelclock_for_modeset = mode->clock;
                 radeon_crtc->bpc = radeon_get_monitor_bpc(connector);
 
                 switch (encoder_mode) {
diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c b/drivers/gpu/drm/radeon/radeon_connectors.c
index 4522f7dce653..933c5c39654d 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -101,6 +101,7 @@ int radeon_get_monitor_bpc(struct drm_connector *connector)
         struct radeon_connector *radeon_connector = to_radeon_connector(connector);
         struct radeon_connector_atom_dig *dig_connector;
         int bpc = 8;
+        int mode_clock, max_tmds_clock;
 
         switch (connector->connector_type) {
         case DRM_MODE_CONNECTOR_DVII:
@@ -166,6 +167,36 @@ int radeon_get_monitor_bpc(struct drm_connector *connector)
                                           connector->name, bpc);
                         bpc = 12;
                 }
+
+                /* Any defined maximum tmds clock limit we must not exceed? */
+                if (connector->max_tmds_clock > 0) {
+                        /* mode_clock is clock in kHz for mode to be modeset on this connector */
+                        mode_clock = radeon_connector->pixelclock_for_modeset;
+
+                        /* Maximum allowable input clock in kHz */
+                        max_tmds_clock = connector->max_tmds_clock * 1000;
+
+                        DRM_DEBUG("%s: hdmi mode dotclock %d kHz, max tmds input clock %d kHz.\n",
+                                          connector->name, mode_clock, max_tmds_clock);
+
+                        /* Check if bpc is within clock limit. Try to degrade gracefully otherwise */
+                        if ((bpc == 12) && (mode_clock * 3/2 > max_tmds_clock)) {
+                                if ((connector->display_info.edid_hdmi_dc_modes & DRM_EDID_HDMI_DC_30) &&
+                                        (mode_clock * 5/4 <= max_tmds_clock))
+                                        bpc = 10;
+                                else
+                                        bpc = 8;
+
+                                DRM_DEBUG("%s: HDMI deep color 12 bpc exceeds max tmds clock. Using %d bpc.\n",
+                                                  connector->name, bpc);
+                        }
+
+                        if ((bpc == 10) && (mode_clock * 5/4 > max_tmds_clock)) {
+                                bpc = 8;
+                                DRM_DEBUG("%s: HDMI deep color 10 bpc exceeds max tmds clock. Using %d bpc.\n",
+                                                  connector->name, bpc);
+                        }
+                }
         }
 
         DRM_DEBUG("%s: Display bpc=%d, returned bpc=%d\n",
diff --git a/drivers/gpu/drm/radeon/radeon_mode.h b/drivers/gpu/drm/radeon/radeon_mode.h
index ea72ad889a11..ad0e4b8cc7e3 100644
--- a/drivers/gpu/drm/radeon/radeon_mode.h
+++ b/drivers/gpu/drm/radeon/radeon_mode.h
@@ -506,6 +506,7 @@ struct radeon_connector {
         struct radeon_i2c_chan *router_bus;
         enum radeon_connector_audio audio;
         enum radeon_connector_dither dither;
+        int pixelclock_for_modeset;
 };
 
 struct radeon_framebuffer {