Revert "drm/radeon/kms: switch back to min->max pll post divider iteration"
Alex Deucher [Mon, 21 Feb 2011 06:11:59 +0000 (01:11 -0500)]
This reverts commit a6f9761743bf35b052180f4a8bdae4d2cc0465f6.

Remove this commit as it is no longer necessary. The relevant bugs
were fixed properly in:
drm/radeon/kms: hopefully fix pll issues for real (v3)
5b40ddf888398ce4cccbf3b9d0a18d90149ed7ff
drm/radeon/kms: add missing frac fb div flag for dce4+
9f4283f49f0a96a64c5a45fe56f0f8c942885eef

This commit also broke certain ~5 Mhz modes on old arcade monitors,
so reverting this commit fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=29502

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

drivers/gpu/drm/radeon/radeon_display.c

index 0e65709..3e7e7f9 100644 (file)
@@ -971,7 +971,7 @@ void radeon_compute_pll_legacy(struct radeon_pll *pll,
                max_fractional_feed_div = pll->max_frac_feedback_div;
        }
 
-       for (post_div = min_post_div; post_div <= max_post_div; ++post_div) {
+       for (post_div = max_post_div; post_div >= min_post_div; --post_div) {
                uint32_t ref_div;
 
                if ((pll->flags & RADEON_PLL_NO_ODD_POST_DIV) && (post_div & 1))