drm/radeon/kms: use frac fb div on APUs
authorAlex Deucher <alexander.deucher@amd.com>
Thu, 19 Apr 2012 14:48:38 +0000 (10:48 -0400)
committerDave Airlie <airlied@redhat.com>
Fri, 27 Apr 2012 07:30:19 +0000 (08:30 +0100)
Seems to be more stable on certain monitors.

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=48880

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

index b5ff1f7b6f7ee4f3917d6d83e137ec02998a6d78..c5c31e091a9276b2817a6d4123eb979ff25146b4 100644 (file)
@@ -575,6 +575,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 
                if (rdev->family < CHIP_RV770)
                        pll->flags |= RADEON_PLL_PREFER_MINM_OVER_MAXP;
+               /* use frac fb div on APUs */
+               if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))
+                       pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
        } else {
                pll->flags |= RADEON_PLL_LEGACY;