drm/radeon/kms: disable frac fb dividers for rs6xx

Should fix fdo bug 28331:
https://bugs.freedesktop.org/show_bug.cgi?id=28331

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index f3f2827..8c2d647 100644 (file)
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -498,7 +498,7 @@ static u32 atombios_adjust_pll(struct drm_crtc *crtc,
                if ((rdev->family == CHIP_RS600) ||
                    (rdev->family == CHIP_RS690) ||
                    (rdev->family == CHIP_RS740))
-                       pll->flags |= (RADEON_PLL_USE_FRAC_FB_DIV |
+                       pll->flags |= (/*RADEON_PLL_USE_FRAC_FB_DIV |*/
                                       RADEON_PLL_PREFER_CLOSEST_LOWER);
 
                if (ASIC_IS_DCE32(rdev) && mode->clock > 200000)        /* range limits??? */