Re: [Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Chris Wilson
Quoting Ville Syrjälä (2020-10-22 18:33:43)
> On Thu, Oct 22, 2020 at 12:42:46PM +0100, Chris Wilson wrote:
> > As we disable the interrupt during suspend, also reset the irq_mask to
> > short-circuit subsystems that later try to turn off their interrupt
> > source.
> > 
> > <4>[  101.816730] i915 :00:02.0: 
> > drm_WARN_ON(!intel_irqs_enabled(dev_priv))
> > <4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
> > drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]
> > 
> > v2: Reset irq_mask for i8xx_irq_reset as well, and split patch to focus
> > on only i915->irq_mask
> > 
> > Signed-off-by: Chris Wilson 
> > Cc: Ville Syrjälä 
> 
> Reviewed-by: Ville Syrjälä 

And fingers crossed for fi-ilk-m making a speedy recovery.
-Chris
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Re: [Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Ville Syrjälä
On Thu, Oct 22, 2020 at 12:42:46PM +0100, Chris Wilson wrote:
> As we disable the interrupt during suspend, also reset the irq_mask to
> short-circuit subsystems that later try to turn off their interrupt
> source.
> 
> <4>[  101.816730] i915 :00:02.0: 
> drm_WARN_ON(!intel_irqs_enabled(dev_priv))
> <4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
> drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]
> 
> v2: Reset irq_mask for i8xx_irq_reset as well, and split patch to focus
> on only i915->irq_mask
> 
> Signed-off-by: Chris Wilson 
> Cc: Ville Syrjälä 

Reviewed-by: Ville Syrjälä 

> ---
>  drivers/gpu/drm/i915/i915_irq.c | 12 +++-
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 09221ca1ffb2..53e67c796d09 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -337,17 +337,14 @@ void ilk_update_display_irq(struct drm_i915_private 
> *dev_priv,
>   u32 new_val;
>  
>   lockdep_assert_held(&dev_priv->irq_lock);
> -
>   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
>  
> - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> - return;
> -
>   new_val = dev_priv->irq_mask;
>   new_val &= ~interrupt_mask;
>   new_val |= (~enabled_irq_mask & interrupt_mask);
>  
> - if (new_val != dev_priv->irq_mask) {
> + if (new_val != dev_priv->irq_mask &&
> + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
>   dev_priv->irq_mask = new_val;
>   I915_WRITE(DEIMR, dev_priv->irq_mask);
>   POSTING_READ(DEIMR);
> @@ -2951,6 +2948,8 @@ static void ilk_irq_reset(struct drm_i915_private 
> *dev_priv)
>   struct intel_uncore *uncore = &dev_priv->uncore;
>  
>   GEN3_IRQ_RESET(uncore, DE);
> + dev_priv->irq_mask = ~0u;
> +
>   if (IS_GEN(dev_priv, 7))
>   intel_uncore_write(uncore, GEN7_ERR_INT, 0x);
>  
> @@ -3695,6 +3694,7 @@ static void i8xx_irq_reset(struct drm_i915_private 
> *dev_priv)
>   i9xx_pipestat_irq_reset(dev_priv);
>  
>   GEN2_IRQ_RESET(uncore);
> + dev_priv->irq_mask = ~0u;
>  }
>  
>  static void i8xx_irq_postinstall(struct drm_i915_private *dev_priv)
> @@ -3864,6 +3864,7 @@ static void i915_irq_reset(struct drm_i915_private 
> *dev_priv)
>   i9xx_pipestat_irq_reset(dev_priv);
>  
>   GEN3_IRQ_RESET(uncore, GEN2_);
> + dev_priv->irq_mask = ~0u;
>  }
>  
>  static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
> @@ -3970,6 +3971,7 @@ static void i965_irq_reset(struct drm_i915_private 
> *dev_priv)
>   i9xx_pipestat_irq_reset(dev_priv);
>  
>   GEN3_IRQ_RESET(uncore, GEN2_);
> + dev_priv->irq_mask = ~0u;
>  }
>  
>  static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
> -- 
> 2.20.1

-- 
Ville Syrjälä
Intel
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[Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Chris Wilson
As we disable the interrupt during suspend, also reset the irq_mask to
short-circuit subsystems that later try to turn off their interrupt
source.

<4>[  101.816730] i915 :00:02.0: drm_WARN_ON(!intel_irqs_enabled(dev_priv))
<4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]

v2: Reset irq_mask for i8xx_irq_reset as well, and split patch to focus
on only i915->irq_mask

Signed-off-by: Chris Wilson 
Cc: Ville Syrjälä 
---
 drivers/gpu/drm/i915/i915_irq.c | 12 +++-
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 09221ca1ffb2..53e67c796d09 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -337,17 +337,14 @@ void ilk_update_display_irq(struct drm_i915_private 
*dev_priv,
u32 new_val;
 
lockdep_assert_held(&dev_priv->irq_lock);
-
drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
 
-   if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
-   return;
-
new_val = dev_priv->irq_mask;
new_val &= ~interrupt_mask;
new_val |= (~enabled_irq_mask & interrupt_mask);
 
-   if (new_val != dev_priv->irq_mask) {
+   if (new_val != dev_priv->irq_mask &&
+   !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
dev_priv->irq_mask = new_val;
I915_WRITE(DEIMR, dev_priv->irq_mask);
POSTING_READ(DEIMR);
@@ -2951,6 +2948,8 @@ static void ilk_irq_reset(struct drm_i915_private 
*dev_priv)
struct intel_uncore *uncore = &dev_priv->uncore;
 
GEN3_IRQ_RESET(uncore, DE);
+   dev_priv->irq_mask = ~0u;
+
if (IS_GEN(dev_priv, 7))
intel_uncore_write(uncore, GEN7_ERR_INT, 0x);
 
@@ -3695,6 +3694,7 @@ static void i8xx_irq_reset(struct drm_i915_private 
*dev_priv)
i9xx_pipestat_irq_reset(dev_priv);
 
GEN2_IRQ_RESET(uncore);
+   dev_priv->irq_mask = ~0u;
 }
 
 static void i8xx_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -3864,6 +3864,7 @@ static void i915_irq_reset(struct drm_i915_private 
*dev_priv)
i9xx_pipestat_irq_reset(dev_priv);
 
GEN3_IRQ_RESET(uncore, GEN2_);
+   dev_priv->irq_mask = ~0u;
 }
 
 static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -3970,6 +3971,7 @@ static void i965_irq_reset(struct drm_i915_private 
*dev_priv)
i9xx_pipestat_irq_reset(dev_priv);
 
GEN3_IRQ_RESET(uncore, GEN2_);
+   dev_priv->irq_mask = ~0u;
 }
 
 static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
-- 
2.20.1

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Re: [Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Chris Wilson
Quoting Ville Syrjälä (2020-10-22 12:32:52)
> On Thu, Oct 22, 2020 at 08:16:37AM +0100, Chris Wilson wrote:
> > As we disable the interrupt during suspend, also reset the irq_mask to
> > short-circuit subsystems that later try to turn off their interrupt
> > source.
> > 
> > <4>[  101.816730] i915 :00:02.0: 
> > drm_WARN_ON(!intel_irqs_enabled(dev_priv))
> > <4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
> > drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]
> 
> Doh. Lack of irq symmetry in suspend vs. resume strikes again :(
> 
> > 
> > Signed-off-by: Chris Wilson 
> > Cc: Ville Syrjälä 
> > ---
> >  drivers/gpu/drm/i915/i915_irq.c | 25 ++---
> >  1 file changed, 10 insertions(+), 15 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_irq.c 
> > b/drivers/gpu/drm/i915/i915_irq.c
> > index 09221ca1ffb2..cbb71fc73313 100644
> > --- a/drivers/gpu/drm/i915/i915_irq.c
> > +++ b/drivers/gpu/drm/i915/i915_irq.c
> > @@ -337,17 +337,14 @@ void ilk_update_display_irq(struct drm_i915_private 
> > *dev_priv,
> >   u32 new_val;
> >  
> >   lockdep_assert_held(&dev_priv->irq_lock);
> > -
> >   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
> >  
> > - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> > - return;
> > -
> >   new_val = dev_priv->irq_mask;
> >   new_val &= ~interrupt_mask;
> >   new_val |= (~enabled_irq_mask & interrupt_mask);
> >  
> > - if (new_val != dev_priv->irq_mask) {
> > + if (new_val != dev_priv->irq_mask &&
> > + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
> >   dev_priv->irq_mask = new_val;
> >   I915_WRITE(DEIMR, dev_priv->irq_mask);
> >   POSTING_READ(DEIMR);
> > @@ -368,19 +365,16 @@ static void bdw_update_port_irq(struct 
> > drm_i915_private *dev_priv,
> >   u32 old_val;
> >  
> >   lockdep_assert_held(&dev_priv->irq_lock);
> > -
> >   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
> >  
> > - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> > - return;
> > -
> >   old_val = I915_READ(GEN8_DE_PORT_IMR);
> >  
> >   new_val = old_val;
> >   new_val &= ~interrupt_mask;
> >   new_val |= (~enabled_irq_mask & interrupt_mask);
> >  
> > - if (new_val != old_val) {
> > + if (new_val != old_val &&
> > + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
> >   I915_WRITE(GEN8_DE_PORT_IMR, new_val);
> >   POSTING_READ(GEN8_DE_PORT_IMR);
> >   }
> > @@ -401,17 +395,14 @@ void bdw_update_pipe_irq(struct drm_i915_private 
> > *dev_priv,
> >   u32 new_val;
> >  
> >   lockdep_assert_held(&dev_priv->irq_lock);
> > -
> >   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
> >  
> > - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> > - return;
> > -
> >   new_val = dev_priv->de_irq_mask[pipe];
> >   new_val &= ~interrupt_mask;
> >   new_val |= (~enabled_irq_mask & interrupt_mask);
> >  
> > - if (new_val != dev_priv->de_irq_mask[pipe]) {
> > + if (new_val != dev_priv->de_irq_mask[pipe] &&
> > + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
> >   dev_priv->de_irq_mask[pipe] = new_val;
> >   I915_WRITE(GEN8_DE_PIPE_IMR(pipe), 
> > dev_priv->de_irq_mask[pipe]);
> >   POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
> 
> Not resetting de_irq_mask[] anywhere? Hmm. we seem to be lacking a
> gen8_de_irq_reset()...

Maybe I was being a bit optimistic, and erred on the side of sticking to
the simple resets.

> > @@ -2951,6 +2942,8 @@ static void ilk_irq_reset(struct drm_i915_private 
> > *dev_priv)
> >   struct intel_uncore *uncore = &dev_priv->uncore;
> >  
> >   GEN3_IRQ_RESET(uncore, DE);
> > + dev_priv->irq_mask = ~0u;
> > +
> >   if (IS_GEN(dev_priv, 7))
> >   intel_uncore_write(uncore, GEN7_ERR_INT, 0x);
> >  
> > @@ -3864,6 +3857,7 @@ static void i915_irq_reset(struct drm_i915_private 
> > *dev_priv)
> >   i9xx_pipestat_irq_reset(dev_priv);
> >  
> >   GEN3_IRQ_RESET(uncore, GEN2_);
> > + dev_priv->irq_mask = ~0u;
> >  }
> >  
> >  static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
> > @@ -3970,6 +3964,7 @@ static void i965_irq_reset(struct drm_i915_private 
> > *dev_priv)
> >   i9xx_pipestat_irq_reset(dev_priv);
> >  
> >   GEN3_IRQ_RESET(uncore, GEN2_);
> > + dev_priv->irq_mask = ~0u;
> >  }
> 
> Missing gen2?

Hmm, I saw GEN2 and assumed it was covered. i8xx_irq_reset() looks
straightforward.

I guess split this patch to only think about dev_priv->irq_mask...
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Re: [Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Ville Syrjälä
On Thu, Oct 22, 2020 at 08:16:37AM +0100, Chris Wilson wrote:
> As we disable the interrupt during suspend, also reset the irq_mask to
> short-circuit subsystems that later try to turn off their interrupt
> source.
> 
> <4>[  101.816730] i915 :00:02.0: 
> drm_WARN_ON(!intel_irqs_enabled(dev_priv))
> <4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
> drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]

Doh. Lack of irq symmetry in suspend vs. resume strikes again :(

> 
> Signed-off-by: Chris Wilson 
> Cc: Ville Syrjälä 
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 25 ++---
>  1 file changed, 10 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 09221ca1ffb2..cbb71fc73313 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -337,17 +337,14 @@ void ilk_update_display_irq(struct drm_i915_private 
> *dev_priv,
>   u32 new_val;
>  
>   lockdep_assert_held(&dev_priv->irq_lock);
> -
>   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
>  
> - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> - return;
> -
>   new_val = dev_priv->irq_mask;
>   new_val &= ~interrupt_mask;
>   new_val |= (~enabled_irq_mask & interrupt_mask);
>  
> - if (new_val != dev_priv->irq_mask) {
> + if (new_val != dev_priv->irq_mask &&
> + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
>   dev_priv->irq_mask = new_val;
>   I915_WRITE(DEIMR, dev_priv->irq_mask);
>   POSTING_READ(DEIMR);
> @@ -368,19 +365,16 @@ static void bdw_update_port_irq(struct drm_i915_private 
> *dev_priv,
>   u32 old_val;
>  
>   lockdep_assert_held(&dev_priv->irq_lock);
> -
>   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
>  
> - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> - return;
> -
>   old_val = I915_READ(GEN8_DE_PORT_IMR);
>  
>   new_val = old_val;
>   new_val &= ~interrupt_mask;
>   new_val |= (~enabled_irq_mask & interrupt_mask);
>  
> - if (new_val != old_val) {
> + if (new_val != old_val &&
> + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
>   I915_WRITE(GEN8_DE_PORT_IMR, new_val);
>   POSTING_READ(GEN8_DE_PORT_IMR);
>   }
> @@ -401,17 +395,14 @@ void bdw_update_pipe_irq(struct drm_i915_private 
> *dev_priv,
>   u32 new_val;
>  
>   lockdep_assert_held(&dev_priv->irq_lock);
> -
>   drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
>  
> - if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
> - return;
> -
>   new_val = dev_priv->de_irq_mask[pipe];
>   new_val &= ~interrupt_mask;
>   new_val |= (~enabled_irq_mask & interrupt_mask);
>  
> - if (new_val != dev_priv->de_irq_mask[pipe]) {
> + if (new_val != dev_priv->de_irq_mask[pipe] &&
> + !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
>   dev_priv->de_irq_mask[pipe] = new_val;
>   I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
>   POSTING_READ(GEN8_DE_PIPE_IMR(pipe));

Not resetting de_irq_mask[] anywhere? Hmm. we seem to be lacking a
gen8_de_irq_reset()...

> @@ -2951,6 +2942,8 @@ static void ilk_irq_reset(struct drm_i915_private 
> *dev_priv)
>   struct intel_uncore *uncore = &dev_priv->uncore;
>  
>   GEN3_IRQ_RESET(uncore, DE);
> + dev_priv->irq_mask = ~0u;
> +
>   if (IS_GEN(dev_priv, 7))
>   intel_uncore_write(uncore, GEN7_ERR_INT, 0x);
>  
> @@ -3864,6 +3857,7 @@ static void i915_irq_reset(struct drm_i915_private 
> *dev_priv)
>   i9xx_pipestat_irq_reset(dev_priv);
>  
>   GEN3_IRQ_RESET(uncore, GEN2_);
> + dev_priv->irq_mask = ~0u;
>  }
>  
>  static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
> @@ -3970,6 +3964,7 @@ static void i965_irq_reset(struct drm_i915_private 
> *dev_priv)
>   i9xx_pipestat_irq_reset(dev_priv);
>  
>   GEN3_IRQ_RESET(uncore, GEN2_);
> + dev_priv->irq_mask = ~0u;
>  }

Missing gen2?

>  
>  static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
> -- 
> 2.20.1

-- 
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[Intel-gfx] [PATCH] drm/i915: Reset the interrupt mask on disabling interrupts

2020-10-22 Thread Chris Wilson
As we disable the interrupt during suspend, also reset the irq_mask to
short-circuit subsystems that later try to turn off their interrupt
source.

<4>[  101.816730] i915 :00:02.0: drm_WARN_ON(!intel_irqs_enabled(dev_priv))
<4>[  101.816853] WARNING: CPU: 3 PID: 4241 at 
drivers/gpu/drm/i915/i915_irq.c:343 ilk_update_display_irq+0xb3/0x130 [i915]

Signed-off-by: Chris Wilson 
Cc: Ville Syrjälä 
---
 drivers/gpu/drm/i915/i915_irq.c | 25 ++---
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 09221ca1ffb2..cbb71fc73313 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -337,17 +337,14 @@ void ilk_update_display_irq(struct drm_i915_private 
*dev_priv,
u32 new_val;
 
lockdep_assert_held(&dev_priv->irq_lock);
-
drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
 
-   if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
-   return;
-
new_val = dev_priv->irq_mask;
new_val &= ~interrupt_mask;
new_val |= (~enabled_irq_mask & interrupt_mask);
 
-   if (new_val != dev_priv->irq_mask) {
+   if (new_val != dev_priv->irq_mask &&
+   !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
dev_priv->irq_mask = new_val;
I915_WRITE(DEIMR, dev_priv->irq_mask);
POSTING_READ(DEIMR);
@@ -368,19 +365,16 @@ static void bdw_update_port_irq(struct drm_i915_private 
*dev_priv,
u32 old_val;
 
lockdep_assert_held(&dev_priv->irq_lock);
-
drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
 
-   if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
-   return;
-
old_val = I915_READ(GEN8_DE_PORT_IMR);
 
new_val = old_val;
new_val &= ~interrupt_mask;
new_val |= (~enabled_irq_mask & interrupt_mask);
 
-   if (new_val != old_val) {
+   if (new_val != old_val &&
+   !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
I915_WRITE(GEN8_DE_PORT_IMR, new_val);
POSTING_READ(GEN8_DE_PORT_IMR);
}
@@ -401,17 +395,14 @@ void bdw_update_pipe_irq(struct drm_i915_private 
*dev_priv,
u32 new_val;
 
lockdep_assert_held(&dev_priv->irq_lock);
-
drm_WARN_ON(&dev_priv->drm, enabled_irq_mask & ~interrupt_mask);
 
-   if (drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv)))
-   return;
-
new_val = dev_priv->de_irq_mask[pipe];
new_val &= ~interrupt_mask;
new_val |= (~enabled_irq_mask & interrupt_mask);
 
-   if (new_val != dev_priv->de_irq_mask[pipe]) {
+   if (new_val != dev_priv->de_irq_mask[pipe] &&
+   !drm_WARN_ON(&dev_priv->drm, !intel_irqs_enabled(dev_priv))) {
dev_priv->de_irq_mask[pipe] = new_val;
I915_WRITE(GEN8_DE_PIPE_IMR(pipe), dev_priv->de_irq_mask[pipe]);
POSTING_READ(GEN8_DE_PIPE_IMR(pipe));
@@ -2951,6 +2942,8 @@ static void ilk_irq_reset(struct drm_i915_private 
*dev_priv)
struct intel_uncore *uncore = &dev_priv->uncore;
 
GEN3_IRQ_RESET(uncore, DE);
+   dev_priv->irq_mask = ~0u;
+
if (IS_GEN(dev_priv, 7))
intel_uncore_write(uncore, GEN7_ERR_INT, 0x);
 
@@ -3864,6 +3857,7 @@ static void i915_irq_reset(struct drm_i915_private 
*dev_priv)
i9xx_pipestat_irq_reset(dev_priv);
 
GEN3_IRQ_RESET(uncore, GEN2_);
+   dev_priv->irq_mask = ~0u;
 }
 
 static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
@@ -3970,6 +3964,7 @@ static void i965_irq_reset(struct drm_i915_private 
*dev_priv)
i9xx_pipestat_irq_reset(dev_priv);
 
GEN3_IRQ_RESET(uncore, GEN2_);
+   dev_priv->irq_mask = ~0u;
 }
 
 static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
-- 
2.20.1

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