drm/radeon/kms: use frac fb div on APUs

Seems to be more stable on certain monitors. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=48880 Signed-off-by: Alex Deucher <[email protected]> Cc: [email protected] Signed-off-by: Dave Airlie <[email protected]>
chewitt · Apr 27, 2012 · 37d4174 · 37d4174
1 parent df391c0
commit 37d4174
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -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;