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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>
This commit is contained in:
Alex Deucher 2014-01-15 13:41:31 -05:00
parent f5f1f897c8
commit 18f8f52b9a
3 changed files with 13 additions and 3 deletions
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8
drivers/gpu/drm/radeon/atombios_crtc.c
View File

@ -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;
}

7
drivers/gpu/drm/radeon/radeon_atombios.c
View File

@ -1511,6 +1511,7 @@ bool radeon_atombios_get_asic_ss_info(struct radeon_device *rdev,
le16_to_cpu(ss_assign->v1.usSpreadSpectrumPercentage);
ss->type = ss_assign->v1.ucSpreadSpectrumMode;
ss->rate = le16_to_cpu(ss_assign->v1.usSpreadRateInKhz);
ss->percentage_divider = 100;
return true;
}
ss_assign = (union asic_ss_assignment *)
@ -1528,6 +1529,7 @@ bool radeon_atombios_get_asic_ss_info(struct radeon_device *rdev,
le16_to_cpu(ss_assign->v2.usSpreadSpectrumPercentage);
ss->type = ss_assign->v2.ucSpreadSpectrumMode;
ss->rate = le16_to_cpu(ss_assign->v2.usSpreadRateIn10Hz);
ss->percentage_divider = 100;
if ((crev == 2) &&
((id == ASIC_INTERNAL_ENGINE_SS) ||
(id == ASIC_INTERNAL_MEMORY_SS)))
@ -1549,6 +1551,11 @@ bool radeon_atombios_get_asic_ss_info(struct radeon_device *rdev,
le16_to_cpu(ss_assign->v3.usSpreadSpectrumPercentage);
ss->type = ss_assign->v3.ucSpreadSpectrumMode;
ss->rate = le16_to_cpu(ss_assign->v3.usSpreadRateIn10Hz);
if (ss_assign->v3.ucSpreadSpectrumMode &
SS_MODE_V3_PERCENTAGE_DIV_BY_1000_MASK)
ss->percentage_divider = 1000;
else
ss->percentage_divider = 100;
if ((id == ASIC_INTERNAL_ENGINE_SS) ||
(id == ASIC_INTERNAL_MEMORY_SS))
ss->rate /= 100;

1
drivers/gpu/drm/radeon/radeon_mode.h
View File

@ -291,6 +291,7 @@ struct radeon_tv_regs {
struct radeon_atom_ss {
uint16_t percentage;
uint16_t percentage_divider;
uint8_t type;
uint16_t step;
uint8_t delay;