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Date:	Thu, 20 Mar 2014 17:04:22 -0700
From:	Greg Kroah-Hartman <>
Cc:	Greg Kroah-Hartman <>,, Alex Deucher <>
Subject: [PATCH 3.13 099/149] drm/radeon/atom: select the proper number of lanes in transmitter setup

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


From: Alex Deucher <>

commit d03874c881a049a50e12f285077ab1f9fc2686e1 upstream.

We need to check for DVI vs. HDMI when setting up duallink since
HDMI is single link only.  Fixes 4k modes on newer asics.


Signed-off-by: Alex Deucher <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/gpu/drm/radeon/atombios_encoders.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -1313,7 +1313,7 @@ atombios_dig_transmitter_setup(struct dr
 			if (is_dp)
 				args.v5.ucLaneNum = dp_lane_count;
-			else if (radeon_encoder->pixel_clock > 165000)
+			else if (radeon_dig_monitor_is_duallink(encoder, radeon_encoder->pixel_clock))
 				args.v5.ucLaneNum = 8;
 				args.v5.ucLaneNum = 4;

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