From: Christian König <christian.koe...@amd.com>

Looks like some RV6xx have problems with that.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/radeon/atombios_crtc.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 @@ 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;
                        }
                }
-- 
2.5.0

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