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authorAlex Deucher <alexander.deucher@amd.com>2014-01-15 13:41:31 -0500
committerAlex Deucher <alexander.deucher@amd.com>2014-01-20 18:20:52 -0500
commit18f8f52b9a8c293111c058f9d25bcd5e718b80b2 (patch)
tree7884276588256c4ba185f6846a248b1de3fb0140 /drivers/gpu/drm/radeon/atombios_crtc.c
parentf5f1f897c892cbff6135cd743df9989ca7bc29e4 (diff)
downloadop-kernel-dev-18f8f52b9a8c293111c058f9d25bcd5e718b80b2.zip
op-kernel-dev-18f8f52b9a8c293111c058f9d25bcd5e718b80b2.tar.gz
drm/radeon: handle ss percentage divider properly
It's either 100 or 1000 depending on the flags in the table. Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/atombios_crtc.c')
-rw-r--r--drivers/gpu/drm/radeon/atombios_crtc.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/gpu/drm/radeon/atombios_crtc.c b/drivers/gpu/drm/radeon/atombios_crtc.c
index 762b660..fd9daf4 100644
--- a/drivers/gpu/drm/radeon/atombios_crtc.c
+++ b/drivers/gpu/drm/radeon/atombios_crtc.c
@@ -1042,15 +1042,17 @@ static void atombios_crtc_set_pll(struct drm_crtc *crtc, struct drm_display_mode
/* calculate ss amount and step size */
if (ASIC_IS_DCE4(rdev)) {
u32 step_size;
- u32 amount = (((fb_div * 10) + frac_fb_div) * radeon_crtc->ss.percentage) / 10000;
+ u32 amount = (((fb_div * 10) + frac_fb_div) *
+ (u32)radeon_crtc->ss.percentage) /
+ (100 * (u32)radeon_crtc->ss.percentage_divider);
radeon_crtc->ss.amount = (amount / 10) & ATOM_PPLL_SS_AMOUNT_V2_FBDIV_MASK;
radeon_crtc->ss.amount |= ((amount - (amount / 10)) << ATOM_PPLL_SS_AMOUNT_V2_NFRAC_SHIFT) &
ATOM_PPLL_SS_AMOUNT_V2_NFRAC_MASK;
if (radeon_crtc->ss.type & ATOM_PPLL_SS_TYPE_V2_CENTRE_SPREAD)
- step_size = (4 * amount * ref_div * (radeon_crtc->ss.rate * 2048)) /
+ step_size = (4 * amount * ref_div * ((u32)radeon_crtc->ss.rate * 2048)) /
(125 * 25 * pll->reference_freq / 100);
else
- step_size = (2 * amount * ref_div * (radeon_crtc->ss.rate * 2048)) /
+ step_size = (2 * amount * ref_div * ((u32)radeon_crtc->ss.rate * 2048)) /
(125 * 25 * pll->reference_freq / 100);
radeon_crtc->ss.step = step_size;
}
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