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drm/radeon: only apply the SS fractional workaround to RS[78]80

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Looks like some RV6xx have problems with that.

bug:
https://bugs.freedesktop.org/show_bug.cgi?id=97099

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Christian König 2016-08-18 11:51:14 +02:00 committed by Alex Deucher
parent 91d62d9f30
commit ae5b80d2b6
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -627,7 +627,9 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
if (radeon_crtc->ss.refdiv) {
radeon_crtc->pll_flags |= RADEON_PLL_USE_REF_DIV;
radeon_crtc->pll_reference_div = radeon_crtc->ss.refdiv;
if (rdev->family >= CHIP_RV770)
if (ASIC_IS_AVIVO(rdev) &&
rdev->family != CHIP_RS780 &&
rdev->family != CHIP_RS880)
radeon_crtc->pll_flags |= RADEON_PLL_USE_FRAC_FB_DIV;
}
}