On Mon, Feb 22, 2016 at 03:59:28PM +0200, Imre Deak wrote:
> On pe, 2016-02-19 at 20:47 +0200, [email protected] wrote:
> > From: Ville Syrjälä <[email protected]>
> >
> > 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 <[email protected]>
> > ---
> > drivers/gpu/drm/i915/i915_irq.c | 16 ++++++++++++++++
> > drivers/gpu/drm/i915/intel_drv.h | 2 ++
> > drivers/gpu/drm/i915/intel_runtime_pm.c | 19 +++++++++++++++++++
> > 3 files changed, 37 insertions(+)
> >
> > 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 285b0570be9c..2618e3026e8b 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 59e9222223c9..1afa00855ed8 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");
> > @@ -663,6 +679,9 @@ 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);
> > +
>
> Why not putting this in the existing if branch? Either way:
> Reviewed-by: Imre Deak <[email protected]>
I figured it's better if it mirrors the way the post_enable is done.
>
> > if (enable) {
> > if (!enable_requested) {
> > WARN((tmp & state_mask) &&
--
Ville Syrjälä
Intel OTC
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