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Commit 6bba2e11 authored by Jerome Glisse's avatar Jerome Glisse Committed by Dave Airlie
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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: default avatarJerome Glisse <jglisse@redhat.com>
Reviewed-By: default avatarAlex Deucher <alexdeucher@gmail.com>
Cc: <stable@kernel.org>
Signed-off-by: default avatarDave Airlie <airlied@gmail.com>
parent 52bb4a73

drivers/gpu/drm/radeon/atombios_dp.c

+2 −2
Original line number Diff line number Diff line
@@ -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;