[012/118] drm/radeon: use frac fb div on RS780/RS880

From: Ben Hutchings
Date: Fri May 10 2013 - 10:54:34 EST


3.2.45-rc1 review patch. If anyone has any objections, please let me know.

------------------

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 411678288d61ba17afe1f8afed92200be6bbc65d upstream.

Monitors seem to prefer it. Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=37696

Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
[bwh: Backported to 3.2:
- Adjust context
- Add to pll->flags, not radeon_crtc->pll_flags]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/radeon/atombios_crtc.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -544,6 +544,9 @@ static u32 atombios_adjust_pll(struct dr
/* use frac fb div on APUs */
if (ASIC_IS_DCE41(rdev))
pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
+ /* use frac fb div on RS780/RS880 */
+ if ((rdev->family == CHIP_RS780) || (rdev->family == CHIP_RS880))
+ pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
if (ASIC_IS_DCE32(rdev) && mode->clock > 165000)
pll->flags |= RADEON_PLL_USE_FRAC_FB_DIV;
} else {

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