From 50b44a449ff1a19712ebc36ffccf9ac0a68033bf Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Wed, 5 Jun 2013 13:34:33 +0200 Subject: [PATCH] drm/i915: clear DPLL reg when disabling i9xx dplls Toghether with the hw state readout this should catch cases where we don't properly updated the pll state (either in sw or hw). At least for the shared dpll code the equivalent tricke helped a lot in catching bugs. Also rename the function prefix, it's not a generic piece of infrastructure. Reviewed-by: Imre Deak Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 16 +++++----------- 1 file changed, 5 insertions(+), 11 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index 3d1c97abee2..ae3dc5d1ff5 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -1406,7 +1406,7 @@ static void i9xx_enable_pll(struct intel_crtc *crtc) } /** - * intel_disable_pll - disable a PLL + * i9xx_disable_pll - disable a PLL * @dev_priv: i915 private structure * @pipe: pipe PLL to disable * @@ -1414,11 +1414,8 @@ static void i9xx_enable_pll(struct intel_crtc *crtc) * * Note! This is for pre-ILK only. */ -static void intel_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe) +static void i9xx_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe) { - int reg; - u32 val; - /* Don't disable pipe A or pipe A PLLs if needed */ if (pipe == PIPE_A && (dev_priv->quirks & QUIRK_PIPEA_FORCE)) return; @@ -1426,11 +1423,8 @@ static void intel_disable_pll(struct drm_i915_private *dev_priv, enum pipe pipe) /* Make sure the pipe isn't still relying on us */ assert_pipe_disabled(dev_priv, pipe); - reg = DPLL(pipe); - val = I915_READ(reg); - val &= ~DPLL_VCO_ENABLE; - I915_WRITE(reg, val); - POSTING_READ(reg); + I915_WRITE(DPLL(pipe), 0); + POSTING_READ(DPLL(pipe)); } void vlv_wait_port_ready(struct drm_i915_private *dev_priv, int port) @@ -3782,7 +3776,7 @@ static void i9xx_crtc_disable(struct drm_crtc *crtc) if (encoder->post_disable) encoder->post_disable(encoder); - intel_disable_pll(dev_priv, pipe); + i9xx_disable_pll(dev_priv, pipe); intel_crtc->active = false; intel_update_fbc(dev); -- 2.46.0