drm/radeon: use fixed PPL ref divider if needed
authorChristian König <christian.koenig@amd.com>
Sat, 19 Apr 2014 16:57:14 +0000 (18:57 +0200)
committerChristian König <christian.koenig@amd.com>
Sat, 19 Apr 2014 16:57:14 +0000 (18:57 +0200)
Signed-off-by: Christian König <christian.koenig@amd.com>
drivers/gpu/drm/radeon/radeon_display.c

index 2f7cbb901fb18c04c30c48e7357c23d01edc2529..e6c3c548825910e5912cb3af02a3a4805abfa103 100644 (file)
@@ -880,7 +880,12 @@ void radeon_compute_pll_avivo(struct radeon_pll *pll,
                ref_div_min = pll->reference_div;
        else
                ref_div_min = pll->min_ref_div;
-       ref_div_max = pll->max_ref_div;
+
+       if (pll->flags & RADEON_PLL_USE_FRAC_FB_DIV &&
+           pll->flags & RADEON_PLL_USE_REF_DIV)
+               ref_div_max = pll->reference_div;
+       else
+               ref_div_max = pll->max_ref_div;
 
        /* determine allowed post divider range */
        if (pll->flags & RADEON_PLL_USE_POST_DIV) {