From: Ville Syrjälä Date: Fri, 19 Feb 2016 18:47:30 +0000 (+0200) Subject: drm/i915: Make sure pipe interrupts are processed before turning off power well on... X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=aae8ba844495473cb11298ad263e26e656e6e4b4;p=openwrt%2Fstaging%2Fblogic.git drm/i915: Make sure pipe interrupts are processed before turning off power well on BDW+ Starting from BDW the DE_PIPE interrupts for pipe B and C belong to the relevant display power well. So we should make sure we've finished processing them before turning off the power well. The pipe interrupts shouldn't really happen at this point anymore since we've already shut down the planes/pipes/whatnot, but being a bit paranoid shouldn't hurt. Signed-off-by: Ville Syrjälä Link: http://patchwork.freedesktop.org/patch/msgid/1455907651-16397-1-git-send-email-ville.syrjala@linux.intel.com Reviewed-by: Imre Deak --- diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index d56c261ad867..a9048e1b96e5 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -3366,6 +3366,22 @@ void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv, spin_unlock_irq(&dev_priv->irq_lock); } +void gen8_irq_power_well_pre_disable(struct drm_i915_private *dev_priv, + unsigned int pipe_mask) +{ + spin_lock_irq(&dev_priv->irq_lock); + if (pipe_mask & 1 << PIPE_A) + GEN8_IRQ_RESET_NDX(DE_PIPE, PIPE_A); + if (pipe_mask & 1 << PIPE_B) + GEN8_IRQ_RESET_NDX(DE_PIPE, PIPE_B); + if (pipe_mask & 1 << PIPE_C) + GEN8_IRQ_RESET_NDX(DE_PIPE, PIPE_C); + spin_unlock_irq(&dev_priv->irq_lock); + + /* make sure we're done processing display irqs */ + synchronize_irq(dev_priv->dev->irq); +} + static void cherryview_irq_preinstall(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index c208ca630e99..4852049c9ab3 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -993,6 +993,8 @@ static inline bool intel_irqs_enabled(struct drm_i915_private *dev_priv) int intel_get_crtc_scanline(struct intel_crtc *crtc); void gen8_irq_power_well_post_enable(struct drm_i915_private *dev_priv, unsigned int pipe_mask); +void gen8_irq_power_well_pre_disable(struct drm_i915_private *dev_priv, + unsigned int pipe_mask); /* intel_crt.c */ void intel_crt_init(struct drm_device *dev); diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c index ec4faae49b3f..e2329768902c 100644 --- a/drivers/gpu/drm/i915/intel_runtime_pm.c +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c @@ -284,6 +284,13 @@ static void hsw_power_well_post_enable(struct drm_i915_private *dev_priv) 1 << PIPE_C | 1 << PIPE_B); } +static void hsw_power_well_pre_disable(struct drm_i915_private *dev_priv) +{ + if (IS_BROADWELL(dev_priv)) + gen8_irq_power_well_pre_disable(dev_priv, + 1 << PIPE_C | 1 << PIPE_B); +} + static void skl_power_well_post_enable(struct drm_i915_private *dev_priv, struct i915_power_well *power_well) { @@ -309,6 +316,14 @@ static void skl_power_well_post_enable(struct drm_i915_private *dev_priv, } } +static void skl_power_well_pre_disable(struct drm_i915_private *dev_priv, + struct i915_power_well *power_well) +{ + if (power_well->data == SKL_DISP_PW_2) + gen8_irq_power_well_pre_disable(dev_priv, + 1 << PIPE_C | 1 << PIPE_B); +} + static void hsw_set_power_well(struct drm_i915_private *dev_priv, struct i915_power_well *power_well, bool enable) { @@ -334,6 +349,7 @@ static void hsw_set_power_well(struct drm_i915_private *dev_priv, } else { if (enable_requested) { + hsw_power_well_pre_disable(dev_priv); I915_WRITE(HSW_PWR_WELL_DRIVER, 0); POSTING_READ(HSW_PWR_WELL_DRIVER); DRM_DEBUG_KMS("Requesting to disable the power well\n"); @@ -709,6 +725,9 @@ static void skl_set_power_well(struct drm_i915_private *dev_priv, state_mask = SKL_POWER_WELL_STATE(power_well->data); is_enabled = tmp & state_mask; + if (!enable && enable_requested) + skl_power_well_pre_disable(dev_priv, power_well); + if (enable) { if (!enable_requested) { WARN((tmp & state_mask) &&