drm/radeon: adjust pll when audio is not enabled
authorAlex Deucher <alexander.deucher@amd.com>
Sun, 19 Apr 2015 16:01:00 +0000 (12:01 -0400)
committerAlex Deucher <alexander.deucher@amd.com>
Mon, 27 Apr 2015 13:54:57 +0000 (09:54 -0400)
Fixes display problems with some monitors when audio
is not enabled.

Bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=89505
https://bugzilla.kernel.org/show_bug.cgi?id=94171
Plus several reports on IRC.

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

index dac78ad..42b2ea3 100644 (file)
@@ -580,6 +580,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                else
                        radeon_crtc->pll_flags |= RADEON_PLL_PREFER_LOW_REF_DIV;
 
+               /* if there is no audio, set MINM_OVER_MAXP  */
+               if (!drm_detect_monitor_audio(radeon_connector_edid(connector)))
+                       radeon_crtc->pll_flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
                if (rdev->family < CHIP_RV770)
                        radeon_crtc->pll_flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
                /* use frac fb div on APUs */