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

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Fixes flickering with some high res montiors.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
CC: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2012-11-13 18:03:41 -05:00
parent 0d0b3e7443
commit a02dc74b31
1 changed files with 2 additions and 0 deletions
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2
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -561,6 +561,8 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
/* use frac fb div on APUs */ /* use frac fb div on APUs */
if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev)) if (ASIC_IS_DCE41(rdev) || ASIC_IS_DCE61(rdev))
radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV; 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 { } else {
radeon_crtc->pll_flags |= RADEON_PLL_LEGACY; radeon_crtc->pll_flags |= RADEON_PLL_LEGACY;