[PATCH 1/2] drm/radeon: update mode_valid testing for DP

[Alex Deucher]

When we have a passive adapter validate the clocks
against the HMDI/DVI limits.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/radeon/radeon_connectors.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_connectors.c 
b/drivers/gpu/drm/radeon/radeon_connectors.c
index 933c5c3..cfb2c8f 100644
--- a/drivers/gpu/drm/radeon/radeon_connectors.c
+++ b/drivers/gpu/drm/radeon/radeon_connectors.c
@@ -1549,6 +1549,8 @@ out:
 static int radeon_dp_mode_valid(struct drm_connector *connector,
                                  struct drm_display_mode *mode)
 {
+       struct drm_device *dev = connector->dev;
+       struct radeon_device *rdev = dev->dev_private;
        struct radeon_connector *radeon_connector = 
to_radeon_connector(connector);
        struct radeon_connector_atom_dig *radeon_dig_connector = 
radeon_connector->con_priv;

@@ -1579,14 +1581,23 @@ static int radeon_dp_mode_valid(struct drm_connector 
*connector,
                                        return MODE_PANEL;
                        }
                }
-               return MODE_OK;
        } else {
                if ((radeon_dig_connector->dp_sink_type == 
CONNECTOR_OBJECT_ID_DISPLAYPORT) ||
-                   (radeon_dig_connector->dp_sink_type == 
CONNECTOR_OBJECT_ID_eDP))
+                   (radeon_dig_connector->dp_sink_type == 
CONNECTOR_OBJECT_ID_eDP)) {
                        return radeon_dp_mode_valid_helper(connector, mode);
-               else
-                       return MODE_OK;
+               } else {
+                       if (ASIC_IS_DCE6(rdev) && 
drm_detect_hdmi_monitor(radeon_connector->edid)) {
+                               /* HDMI 1.3+ supports max clock of 340 Mhz */
+                               if (mode->clock > 340000)
+                                       return MODE_CLOCK_HIGH;
+                       } else {
+                               if (mode->clock > 165000)
+                                       return MODE_CLOCK_HIGH;
+                       }
+               }
        }
+
+       return MODE_OK;
 }

 static const struct drm_connector_helper_funcs 
radeon_dp_connector_helper_funcs = {
-- 
1.8.3.1