drm/radeon: disable ss on DP for DCE3.x
commit d8e24525094200601236fa64a54cf73e3d682f2e upstream.
Seems to cause problems with certain DP monitors.
Bug:
https://bugs.freedesktop.org/show_bug.cgi?id=40699
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 5285a90..50684dc 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -938,11 +938,14 @@
radeon_atombios_get_ppll_ss_info(rdev,
&radeon_crtc->ss,
ATOM_DP_SS_ID1);
- } else
+ } else {
radeon_crtc->ss_enabled =
radeon_atombios_get_ppll_ss_info(rdev,
&radeon_crtc->ss,
ATOM_DP_SS_ID1);
+ }
+ /* disable spread spectrum on DCE3 DP */
+ radeon_crtc->ss_enabled = false;
}
break;
case ATOM_ENCODER_MODE_LVDS: