radeon pll: add support for fractional feedback divs

Allows us to hit dot clocks much closer, especially on
chips with non-27 Mhz reference clocks like most IGP chips.

This should fix most flickering and blanking problems with
non-exact dot clocks.

1 files changed, 4 insertions, 0 deletions

diff --git a/src/radeon_driver.c b/src/radeon_driver.c
index db5a0e38..9cbfd0d1 100644
--- a/src/radeon_driver.c
+++ b/src/radeon_driver.c
@@ -1206,9 +1206,13 @@ static void RADEONGetClockInfo(ScrnInfoPtr pScrn)
     if (IS_AVIVO_VARIANT) {
 	pll->min_post_div = 2;
 	pll->max_post_div = 0x7f;
+	pll->min_frac_feedback_div = 0;
+	pll->max_frac_feedback_div = 9;
     } else {
 	pll->min_post_div = 1;
 	pll->max_post_div = 12; //16 on crtc0
+	pll->min_frac_feedback_div = 0;
+	pll->max_frac_feedback_div = 0;
     }
     pll->min_ref_div = 2;
     pll->max_ref_div = 0x3ff;