[ 111/173] drm/radeon/kms: use frac fb div on APUs

[Ben Hutchings]

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 37d4174d2d252c37dcb3d88cafae488542087848 upstream.

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@xxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
[bwh: Backported to 3.2: drop the ASIC_IS_DCE61() case]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/radeon/atombios_crtc.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index b5ff1f7..c5c31e0 100644
--- 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))
+			pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 	} else {
 		pll->flags |= RADEON_PLL_LEGACY;
 


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