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drm/radeon/kms: enable frac fb divs on rs600/rs690/rs740

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Allows us to hit dot clocks much closer, especially on
chips with non-27 Mhz reference clocks like most IGP chips.
This fixes most flickering and blanking problems with
non-exact dot clocks on these chips.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2009-07-13 11:09:56 -04:00 committed by Dave Airlie
parent d0e275a90a
commit eb1300bcd7
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/radeon/atombios_crtc.c
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@ -203,6 +203,12 @@ void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode *mode)
if (ASIC_IS_AVIVO(rdev)) {
uint32_t ss_cntl;
if ((rdev->family == CHIP_RS600) ||
(rdev->family == CHIP_RS690) ||
(rdev->family == CHIP_RS740))
pll_flags |= (RADEON_PLL_USE_FRAC_FB_DIV |
RADEON_PLL_PREFER_CLOSEST_LOWER);
if (ASIC_IS_DCE32(rdev) && mode->clock > 200000) /* range limits??? */
pll_flags |= RADEON_PLL_PREFER_HIGH_FB_DIV;
else