From 7a4198664d46b87025a64530f1530ab2bea54c19 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Tue, 15 Nov 2011 10:28:53 -0800 Subject: [PATCH] drm/i915: don't disable a PCH DPLL that's in use If a PCH pipe PLL is being used by transcoder C, don't disable it. Signed-off-by: Jesse Barnes Signed-off-by: Keith Packard --- drivers/gpu/drm/i915/intel_display.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 2e00c8ae361c..bdab82b999e0 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1204,7 +1204,8 @@ static void intel_disable_pch_pll(struct drm_i915_private *dev_priv, enum pipe pipe) { int reg; - u32 val; + u32 val, pll_mask = TRANSC_DPLL_ENABLE | TRANSC_DPLLB_SEL, + pll_sel = TRANSC_DPLL_ENABLE; if (pipe > 1) return; @@ -1215,6 +1216,15 @@ static void intel_disable_pch_pll(struct drm_i915_private *dev_priv, /* Make sure transcoder isn't still depending on us */ assert_transcoder_disabled(dev_priv, pipe); + if (pipe == 0) + pll_sel |= TRANSC_DPLLA_SEL; + else if (pipe == 1) + pll_sel |= TRANSC_DPLLB_SEL; + + + if ((I915_READ(PCH_DPLL_SEL) & pll_mask) == pll_sel) + return; + reg = PCH_DPLL(pipe); val = I915_READ(reg); val &= ~DPLL_VCO_ENABLE; -- 2.20.1