drm/radeon: only apply the SS fractional workaround to RS[78]80
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
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index a97abc8..1dcf390 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -627,7 +627,9 @@
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;
}
}