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

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.

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

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/gpu/drm/radeon/atombios_encoders.c b/drivers/gpu/drm/radeon/atombios_encoders.c
index 5e891b2..7bb7074 100644 (file)
--- 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 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;