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authorAlex Deucher <alexander.deucher@amd.com>2014-12-10 09:42:10 -0500
committerAlex Deucher <alexander.deucher@amd.com>2015-01-05 12:08:57 -0500
commit410cce2a6b82299b46ff316c6384e789ce275ecb (patch)
treed290d03a5a34b77d477ac98e7edfaca828c7ffd0
parent5665c3ebe5ee8a2c516925461f7214ba59c2e6d7 (diff)
drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw
The check was already in place in the dp mode_valid check, but radeon_dp_get_dp_link_clock() never returned the high clock mode_valid was checking for because that function clipped the clock based on the hw capabilities. Add an explicit check in the mode_valid function. bug: https://bugs.freedesktop.org/show_bug.cgi?id=87172 Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc:stable@vge.kernel.org
-rw-r--r--drivers/gpu/drm/radeon/atombios_dp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 11ba9d21b89b..db42a670f995 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -492,6 +492,10 @@ int radeon_dp_mode_valid_helper(struct drm_connector *connector,
struct radeon_connector_atom_dig *dig_connector;
int dp_clock;
+ if ((mode->clock > 340000) &&
+ (!radeon_connector_is_dp12_capable(connector)))
+ return MODE_CLOCK_HIGH;
+
if (!radeon_connector->con_priv)
return MODE_CLOCK_HIGH;
dig_connector = radeon_connector->con_priv;