[PATCH 3.13.y-ckt 026/103] drm/radeon: properly filter DP1.2 4k modes on non-DP1.2 hw

From: Kamal Mostafa
Date: Wed Feb 18 2015 - 20:00:59 EST

3.13.11-ckt16 -stable review patch. If anyone has any objections, please let me know.


From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 410cce2a6b82299b46ff316c6384e789ce275ecb upstream.

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.


Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
drivers/gpu/drm/radeon/atombios_dp.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/radeon/atombios_dp.c b/drivers/gpu/drm/radeon/atombios_dp.c
index 514a623..719c7a1 100644
--- a/drivers/gpu/drm/radeon/atombios_dp.c
+++ b/drivers/gpu/drm/radeon/atombios_dp.c
@@ -574,6 +574,10 @@ 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)))
if (!radeon_connector->con_priv)
dig_connector = radeon_connector->con_priv;

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