drm/radeon/atom: select the proper number of lanes in transmitter setup

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

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 2cec2ab..607dc14 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_encoders.c
+++ b/drivers/gpu/drm/radeon/atombios_encoders.c
@@ -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;