drm/radeon/dce32+: use fractional fb dividers for high clocks

Fixes flickering with some high res montiors. Signed-off-by: Alex Deucher <alexander.deucher@amd.com> CC: stable@vger.kernel.org
git-mirror · Dec 8, 2012 · a02dc74 · a02dc74
1 parent 0d0b3e7
commit a02dc74
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -561,6 +561,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
 		/* use frac fb div on APUs */
 		if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))
 			radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;
+		if (ASIC_IS_DCE32(rdev) && mode->clock > 165000)
+			radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;
 	} else {
 		radeon_crtc->pll_flags |= RADEON_PLL_LEGACY;