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drm/radeon: use frac fb div on RS780/RS880 

Monitors seem to prefer it.  Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=37696

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2013-04-01 16:06:25 -04:00
parent bf05d99851
commit 411678288d
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -557,6 +557,9 @@ 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;
/* use frac fb div on RS780/RS880 */
if ((rdev->family == CHIP_RS780) || (rdev->family == CHIP_RS880))
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 {