[PATCH 086/222] drm/radeon/dce32+: use fractional fb dividers for high clocks

[Herton Ronaldo Krzesinski]

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

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

From: Alex Deucher <alexander.deucher at amd.com>

commit a02dc74b317d78298cb0587b9b1f6f741fd5c139 upstream.

Fixes flickering with some high res montiors.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
[ herton: on 3.5, set pll->flags instead of radeon_crtc->pll_flags ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/gpu/drm/radeon/atombios_crtc.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 25b8014..80eb8d5 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -577,6 +577,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 		/* use frac fb div on APUs */
 		if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))
 			pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
+		if (ASIC_IS_DCE32(rdev) && mode->clock > 165000)
+			pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 	} else {
 		pll->flags |= RADEON_PLL_LEGACY;
 
-- 
1.7.9.5