[Intel-gfx] [PATCH 19/31] drm/i915: fix up pch pll enabling for pixel multipliers

[Daniel Vetter]

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.

Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/intel_display.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index a30e27a..ecf0b1e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5601,7 +5601,7 @@ 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,
@@ -5663,7 +5663,7 @@ 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;
-- 
1.7.11.7