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radeon/kms: fix dp displayport mode validation 

Check if there is a big enough dp clock & enough dp lane to
drive the video mode provided.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Reviewed-By: Alex Deucher <alexdeucher@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: Dave Airlie <airlied@gmail.com>
This commit is contained in:
Jerome Glisse 2011-01-26 17:51:03 -05:00 committed by Dave Airlie
parent 52bb4a7391
commit 6bba2e1168
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/radeon/atombios_dp.c
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@ -187,9 +187,9 @@ static int dp_link_clock_for_mode_clock(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
int dp_mode_valid(u8 dpcd[DP_DPCD_SIZE], int mode_clock)
{
int lanes = dp_lanes_for_mode_clock(dpcd, mode_clock);
int bw = dp_lanes_for_mode_clock(dpcd, mode_clock);
int dp_clock = dp_link_clock_for_mode_clock(dpcd, mode_clock);
if ((lanes == 0) || (bw == 0))
if ((lanes == 0) || (dp_clock == 0))
return MODE_CLOCK_HIGH;
return MODE_OK;