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drm/i915: fix up pch pll enabling for pixel multipliers 

We have a nice comment saying that the pixel multiplier only sticks
once the vco is on and stable. The only problem is that the enable bit
wasn't set at all. This patch fixes this and so brings the ilk+ pch
pll code in line with the i8xx/i9xx pll code. Or at least improves
matters a lot.

This should fix sdvo on ilk-ivb for low-res modes.

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2013-06-05 13:34:21 +02:00
parent 66e985c035
commit 959e16d65d
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_display.c
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@ -5660,7 +5660,7 @@ static uint32_t ironlake_compute_dpll(struct intel_crtc *intel_crtc,
else
dpll |= PLL_REF_INPUT_DREFCLK;
return dpll;
return dpll | DPLL_VCO_ENABLE;
}
static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
@ -5722,7 +5722,7 @@ static int ironlake_crtc_mode_set(struct drm_crtc *crtc,
&fp, &reduced_clock,
has_reduced_clock ? &fp2 : NULL);
intel_crtc->config.dpll_hw_state.dpll = dpll | DPLL_VCO_ENABLE;
intel_crtc->config.dpll_hw_state.dpll = dpll;
intel_crtc->config.dpll_hw_state.fp0 = fp;
if (has_reduced_clock)
intel_crtc->config.dpll_hw_state.fp1 = fp2;