drm/radeon/atom: select the proper number of lanes in transmitter setup
authorAlex Deucher <alexander.deucher@amd.com>
Thu, 6 Mar 2014 23:09:52 +0000 (18:09 -0500)
committerAlex Deucher <alexander.deucher@amd.com>
Thu, 6 Mar 2014 23:09:52 +0000 (18:09 -0500)
We need to check for DVI vs. HDMI when setting up duallink since
HDMI is single link only.  Fixes 4k modes on newer asics.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=75223

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
drivers/gpu/drm/radeon/atombios_encoders.c

index 2cec2ab02f80c193ce929393cd3d0c86bdd3d7c9..607dc14d195e3540f103bf798d2e6f0e10e5634f 100644 (file)
@@ -1314,7 +1314,7 @@ atombios_dig_transmitter_setup(struct drm_encoder *encoder, int action, uint8_t
                        }
                        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;
                        else
                                args.v5.ucLaneNum = 4;