[PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Sonika Jindal]

Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
Handle it only if hpd has actually occurred like we handle other
interrupts.

Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
---
Hi,

I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
If I put this check before handling HPD, hotplug behaves fine.
Please let me know if you see any issue with this approach.

Thanks,
Sonika

 drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..2d47372 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	u32 dig_hotplug_reg;
 	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
-
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	if (hotplug_trigger) {
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
-- 
1.7.10.4

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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Daniel Vetter]

On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> Handle it only if hpd has actually occurred like we handle other
> interrupts.
> 
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> ---
> Hi,
> 
> I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
> For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
> If I put this check before handling HPD, hotplug behaves fine.
> Please let me know if you see any issue with this approach.

Nice find, this sounds really intrigueing, at least for cpt/ibx platforms.
I'm not sure whether what will happen with atom/i9xx platforms though
since the irq bits are different there. But at least bxt has a FIXME
comment that suggest we do need to save the sticky bits on those platforms
too.

If we can fix this up for all platforms then I think a subsequent patch
could try to re-enable the hpd checks in the hdmi ->detect function and
make use spec compliant. Then after maybe 1-2 kernel releases of testing
we'll know whether it really works.

But I'd really want to enable this everywhere just to have maximal test
coverage - we did have reports on all platforms so it seems a generic
issue.

Thanks, Daniel

> 
> Thanks,
> Sonika
> 
>  drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a6fbe64..2d47372 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	u32 dig_hotplug_reg;
>  	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> -
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	if (hotplug_trigger) {
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}
>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Jindal, Sonika]

On 7/6/2015 2:06 PM, Daniel Vetter wrote:
> On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
>> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
>> Handle it only if hpd has actually occurred like we handle other
>> interrupts.
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>> ---
>> Hi,
>>
>> I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
>> For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
>> If I put this check before handling HPD, hotplug behaves fine.
>> Please let me know if you see any issue with this approach.
>
> Nice find, this sounds really intrigueing, at least for cpt/ibx platforms.
> I'm not sure whether what will happen with atom/i9xx platforms though
> since the irq bits are different there. But at least bxt has a FIXME
> comment that suggest we do need to save the sticky bits on those platforms
> too.
>
> If we can fix this up for all platforms then I think a subsequent patch
> could try to re-enable the hpd checks in the hdmi ->detect function and
> make use spec compliant. Then after maybe 1-2 kernel releases of testing
> we'll know whether it really works.
>
> But I'd really want to enable this everywhere just to have maximal test
> coverage - we did have reports on all platforms so it seems a generic
> issue.
>
I think only cpt/ibx suffer from this. Bxt already set port_hotplug_stat 
only when hpd occurs.
Is there a process to get this checked on all platforms, which the fix I 
suggested?
I can only test on SKL as of now.

Regards,
Sonika
> Thanks, Daniel
>
>>
>> Thanks,
>> Sonika
>>
>>   drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
>>   1 file changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index a6fbe64..2d47372 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>>   	u32 dig_hotplug_reg;
>>   	u32 pin_mask, long_mask;
>>
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> -
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	if (hotplug_trigger) {
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>>
>>   	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
>> --
>> 1.7.10.4
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Ville Syrjälä]

On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> Handle it only if hpd has actually occurred like we handle other
> interrupts.
> 
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> ---
> Hi,
> 
> I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
> For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
> If I put this check before handling HPD, hotplug behaves fine.
> Please let me know if you see any issue with this approach.
> 
> Thanks,
> Sonika
> 
>  drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a6fbe64..2d47372 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	u32 dig_hotplug_reg;
>  	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> -
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	if (hotplug_trigger) {
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}

Deja vu. I think I have the same patch (also for IBX) in my stalled
(and never posted) port A HPD branch. So yeah, I think this
makes sense.

You can also move the dig_hotplug_reg, pin_mask, and long_mask declarations
into the if block since they're not needed elsewhere.


>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Jindal, Sonika]

On 7/6/2015 2:19 PM, Ville Syrjälä wrote:
> On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
>> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
>> Handle it only if hpd has actually occurred like we handle other
>> interrupts.
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>> ---
>> Hi,
>>
>> I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
>> For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
>> If I put this check before handling HPD, hotplug behaves fine.
>> Please let me know if you see any issue with this approach.
>>
>> Thanks,
>> Sonika
>>
>>   drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
>>   1 file changed, 6 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index a6fbe64..2d47372 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>>   	u32 dig_hotplug_reg;
>>   	u32 pin_mask, long_mask;
>>
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> -
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	if (hotplug_trigger) {
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>
> Deja vu. I think I have the same patch (also for IBX) in my stalled
> (and never posted) port A HPD branch. So yeah, I think this
> makes sense.
>
> You can also move the dig_hotplug_reg, pin_mask, and long_mask declarations
> into the if block since they're not needed elsewhere.
Sure. Do you think I should add this for ibx as well?

>
>
>>
>>   	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
>> --
>> 1.7.10.4
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[shuang.he]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 6723
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  302/302              302/302
SNB                                  312/316              312/316
IVB                                  343/343              343/343
BYT                 -2              287/287              285/287
HSW                                  380/380              380/380
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*BYT  igt@gem_partial_pwrite_pread@reads      PASS(1)      FAIL(1)
*BYT  igt@gem_tiled_partial_pwrite_pread@reads      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'
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[PATCH] drm/i915: Handle HPD when it has actually occurred

[Sonika Jindal]

Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
Handle it only if hpd has actually occurred like we handle other
interrupts.
v2: Make few variables local to if block (Ville)

Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..cd504dc 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+						dig_hotplug_reg, hpd_cpt);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
-- 
1.7.10.4

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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Ville Syrjälä]

On Mon, Jul 06, 2015 at 02:31:56PM +0530, Jindal, Sonika wrote:
> 
> 
> On 7/6/2015 2:19 PM, Ville Syrjälä wrote:
> > On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
> >> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> >> Handle it only if hpd has actually occurred like we handle other
> >> interrupts.
> >>
> >> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> >> ---
> >> Hi,
> >>
> >> I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
> >> For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
> >> If I put this check before handling HPD, hotplug behaves fine.
> >> Please let me know if you see any issue with this approach.
> >>
> >> Thanks,
> >> Sonika
> >>
> >>   drivers/gpu/drm/i915/i915_irq.c |   11 ++++++-----
> >>   1 file changed, 6 insertions(+), 5 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> >> index a6fbe64..2d47372 100644
> >> --- a/drivers/gpu/drm/i915/i915_irq.c
> >> +++ b/drivers/gpu/drm/i915/i915_irq.c
> >> @@ -1760,11 +1760,12 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
> >>   	u32 dig_hotplug_reg;
> >>   	u32 pin_mask, long_mask;
> >>
> >> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> -
> >> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> >> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +	if (hotplug_trigger) {
> >> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> >> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +	}
> >
> > Deja vu. I think I have the same patch (also for IBX) in my stalled
> > (and never posted) port A HPD branch. So yeah, I think this
> > makes sense.
> >
> > You can also move the dig_hotplug_reg, pin_mask, and long_mask declarations
> > into the if block since they're not needed elsewhere.
> Sure. Do you think I should add this for ibx as well?

Yes.

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH] [RFC] drm/i915: Handle HPD when it has actually occurred

[Daniel Vetter]

On Mon, Jul 06, 2015 at 02:11:12PM +0530, Jindal, Sonika wrote:
> 
> 
> On 7/6/2015 2:06 PM, Daniel Vetter wrote:
> >On Mon, Jul 06, 2015 at 11:23:53AM +0530, Sonika Jindal wrote:
> >>Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> >>Handle it only if hpd has actually occurred like we handle other
> >>interrupts.
> >>
> >>Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> >>---
> >>Hi,
> >>
> >>I see we don't check for hotplug_trigger before processing the HPD for any of the platform. Is there any reason for this?
> >>For SKL, if I let write to PCH_PORT_HOTPLUG happen for all interrupts, somehow this register gets an invalid value at one point and it zeroes it out.
> >>If I put this check before handling HPD, hotplug behaves fine.
> >>Please let me know if you see any issue with this approach.
> >
> >Nice find, this sounds really intrigueing, at least for cpt/ibx platforms.
> >I'm not sure whether what will happen with atom/i9xx platforms though
> >since the irq bits are different there. But at least bxt has a FIXME
> >comment that suggest we do need to save the sticky bits on those platforms
> >too.
> >
> >If we can fix this up for all platforms then I think a subsequent patch
> >could try to re-enable the hpd checks in the hdmi ->detect function and
> >make use spec compliant. Then after maybe 1-2 kernel releases of testing
> >we'll know whether it really works.
> >
> >But I'd really want to enable this everywhere just to have maximal test
> >coverage - we did have reports on all platforms so it seems a generic
> >issue.
> >
> I think only cpt/ibx suffer from this. Bxt already set port_hotplug_stat
> only when hpd occurs.
> Is there a process to get this checked on all platforms, which the fix I
> suggested?
> I can only test on SKL as of now.

Right I was looking at an older version of the bxt hpd handler which still
had a FIXME. But we probably still have an issue on bxt/i9xx interrupt
handlers since when we've done the original revert to stop looking at the
hpd live status bits in

commit 202adf4b9f5957b26a1cb97267d78e0edb319c5e
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Feb 22 00:53:04 2013 +0100

    drm/i915: Revert hdmi HDP pin checks

we had reports from both ibx/cpt systems and g4x. And vlv/chv/bxt hpd
seems derived from that (with live status, enable and status all smashed
into one register).

Therefore I guess that we need a similar fix of only carefully clearing
status bits on these platforms too. I have no idea what it is though,
might be good to check how exactly windows is handling hpd on these atom
platfroms.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[shuang.he]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 6724
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  302/302              302/302
SNB                                  312/316              312/316
IVB                                  345/345              345/345
BYT                 -1              289/289              288/289
HSW                                  382/382              382/382
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*BYT  igt@gem_partial_pwrite_pread@reads-uncached      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'
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[PATCH] drm/i915: Handle HPD when it has actually occurred

[Sonika Jindal]

Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
Handle it only if hpd has actually occurred like we handle other
interrupts.
v2: Make few variables local to if block (Ville)
v3: Add check for ibx/cpt both (Ville).
    While at it, remove the redundant check for hotplug_trigger from
    pch_get_hpd_pins

Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..ba2c27c 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 	*pin_mask = 0;
 	*long_mask = 0;
 
-	if (!hotplug_trigger)
-		return;
-
 	for_each_hpd_pin(i) {
 		if ((hpd[i] & hotplug_trigger) == 0)
 			continue;
@@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+						dig_hotplug_reg, hpd_ibx);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+						dig_hotplug_reg, hpd_cpt);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
-- 
1.7.10.4

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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[Ville Syrjälä]

On Tue, Jul 07, 2015 at 02:22:20PM +0530, Sonika Jindal wrote:
> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> Handle it only if hpd has actually occurred like we handle other
> interrupts.
> v2: Make few variables local to if block (Ville)
> v3: Add check for ibx/cpt both (Ville).
>     While at it, remove the redundant check for hotplug_trigger from
>     pch_get_hpd_pins
> 
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> ---
>  drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
>  1 file changed, 17 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a6fbe64..ba2c27c 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  	*pin_mask = 0;
>  	*long_mask = 0;
>  
> -	if (!hotplug_trigger)
> -		return;
> -

Looks like BXT still depends on that. So you should change that too,
or leave this in until someone else does it.

>  	for_each_hpd_pin(i) {
>  		if ((hpd[i] & hotplug_trigger) == 0)
>  			continue;
> @@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int pipe;
>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
> -	u32 dig_hotplug_reg;
> -	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +	if (hotplug_trigger) {
> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>  
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> +						dig_hotplug_reg, hpd_ibx);

Indentation is fubar.

> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}
>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
> @@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int pipe;
>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
> -	u32 dig_hotplug_reg;
> -	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +	if (hotplug_trigger) {
> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>  
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> +						dig_hotplug_reg, hpd_cpt);

Ditto

With those fixed this is
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}
>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Ville Syrjälä
Intel OTC
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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[Jindal, Sonika]

On 7/7/2015 6:51 PM, Ville Syrjälä wrote:
> On Tue, Jul 07, 2015 at 02:22:20PM +0530, Sonika Jindal wrote:
>> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
>> Handle it only if hpd has actually occurred like we handle other
>> interrupts.
>> v2: Make few variables local to if block (Ville)
>> v3: Add check for ibx/cpt both (Ville).
>>      While at it, remove the redundant check for hotplug_trigger from
>>      pch_get_hpd_pins
>>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>> ---
>>   drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
>>   1 file changed, 17 insertions(+), 15 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index a6fbe64..ba2c27c 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>>   	*pin_mask = 0;
>>   	*long_mask = 0;
>>
>> -	if (!hotplug_trigger)
>> -		return;
>> -
>
> Looks like BXT still depends on that. So you should change that too,
> or leave this in until someone else does it.
No, for bxt, this function is called from bxt_hpd_handler which is 
called only when "tmp & BXT_DE_PORT_HOTPLUG_MASK" is non-zero.
So, it this is fine for bxt.

>
>>   	for_each_hpd_pin(i) {
>>   		if ((hpd[i] & hotplug_trigger) == 0)
>>   			continue;
>> @@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
>>   	struct drm_i915_private *dev_priv = dev->dev_private;
>>   	int pipe;
>>   	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
>> -	u32 dig_hotplug_reg;
>> -	u32 pin_mask, long_mask;
>>
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +	if (hotplug_trigger) {
>> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>>
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
>> +						dig_hotplug_reg, hpd_ibx);
>
> Indentation is fubar.
This was to avoid 80 char limit.
>
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>>
>>   	if (pch_iir & SDE_AUDIO_POWER_MASK) {
>>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
>> @@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>>   	struct drm_i915_private *dev_priv = dev->dev_private;
>>   	int pipe;
>>   	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
>> -	u32 dig_hotplug_reg;
>> -	u32 pin_mask, long_mask;
>>
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +	if (hotplug_trigger) {
>> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>>
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
>> +						dig_hotplug_reg, hpd_cpt);
>
> Ditto
>
This was to avoid 80 char limit.

> With those fixed this is
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>>
>>   	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
>> --
>> 1.7.10.4
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[shuang.he]

Tested-By: Intel Graphics QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
Task id: 6740
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
ILK                                  302/302              302/302
SNB                                  312/316              312/316
IVB                                  343/343              343/343
BYT                 -2              287/287              285/287
HSW                                  380/380              380/380
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
*BYT  igt@gem_partial_pwrite_pread@reads      PASS(1)      FAIL(1)
*BYT  igt@gem_partial_pwrite_pread@reads-uncached      PASS(1)      FAIL(1)
Note: You need to pay more attention to line start with '*'
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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[Ville Syrjälä]

On Wed, Jul 08, 2015 at 10:40:18AM +0530, Jindal, Sonika wrote:
> 
> 
> On 7/7/2015 6:51 PM, Ville Syrjälä wrote:
> > On Tue, Jul 07, 2015 at 02:22:20PM +0530, Sonika Jindal wrote:
> >> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> >> Handle it only if hpd has actually occurred like we handle other
> >> interrupts.
> >> v2: Make few variables local to if block (Ville)
> >> v3: Add check for ibx/cpt both (Ville).
> >>      While at it, remove the redundant check for hotplug_trigger from
> >>      pch_get_hpd_pins
> >>
> >> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
> >> ---
> >>   drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
> >>   1 file changed, 17 insertions(+), 15 deletions(-)
> >>
> >> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> >> index a6fbe64..ba2c27c 100644
> >> --- a/drivers/gpu/drm/i915/i915_irq.c
> >> +++ b/drivers/gpu/drm/i915/i915_irq.c
> >> @@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
> >>   	*pin_mask = 0;
> >>   	*long_mask = 0;
> >>
> >> -	if (!hotplug_trigger)
> >> -		return;
> >> -
> >
> > Looks like BXT still depends on that. So you should change that too,
> > or leave this in until someone else does it.
> No, for bxt, this function is called from bxt_hpd_handler which is 
> called only when "tmp & BXT_DE_PORT_HOTPLUG_MASK" is non-zero.
> So, it this is fine for bxt.

Oh, right you are. No problem then.

> 
> >
> >>   	for_each_hpd_pin(i) {
> >>   		if ((hpd[i] & hotplug_trigger) == 0)
> >>   			continue;
> >> @@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
> >>   	struct drm_i915_private *dev_priv = dev->dev_private;
> >>   	int pipe;
> >>   	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
> >> -	u32 dig_hotplug_reg;
> >> -	u32 pin_mask, long_mask;
> >>
> >> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> +	if (hotplug_trigger) {
> >> +		u32 dig_hotplug_reg, pin_mask, long_mask;
> >>
> >> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
> >> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> +
> >> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> >> +						dig_hotplug_reg, hpd_ibx);
> >
> > Indentation is fubar.
> This was to avoid 80 char limit.

You have it like this
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+						dig_hotplug_reg, hpd_ibx);

and it should look like this
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				 dig_hotplug_reg, hpd_ibx);

that is the arguments on following lines should line up after the opening
'(' on the first line. Sane editors can do this automagically for you.

> >
> >> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +	}
> >>
> >>   	if (pch_iir & SDE_AUDIO_POWER_MASK) {
> >>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
> >> @@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
> >>   	struct drm_i915_private *dev_priv = dev->dev_private;
> >>   	int pipe;
> >>   	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
> >> -	u32 dig_hotplug_reg;
> >> -	u32 pin_mask, long_mask;
> >>
> >> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> +	if (hotplug_trigger) {
> >> +		u32 dig_hotplug_reg, pin_mask, long_mask;
> >>
> >> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> >> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> >> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> >> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> >> +						dig_hotplug_reg, hpd_cpt);
> >
> > Ditto
> >
> This was to avoid 80 char limit.
> 
> > With those fixed this is
> > Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> >
> >> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> >> +	}
> >>
> >>   	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
> >>   		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
> >> --
> >> 1.7.10.4
> >>
> >> _______________________________________________
> >> Intel-gfx mailing list
> >> Intel-gfx@lists.freedesktop.org
> >> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >

-- 
Ville Syrjälä
Intel OTC
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[PATCH] drm/i915: Handle HPD when it has actually occurred

[Sonika Jindal]

Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
Handle it only if hpd has actually occurred like we handle other
interrupts.
v2: Make few variables local to if block (Ville)
v3: Add check for ibx/cpt both (Ville).
    While at it, remove the redundant check for hotplug_trigger from
    pch_get_hpd_pins
v4: Indentation (Ville)

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index a6fbe64..a897f68 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
 	*pin_mask = 0;
 	*long_mask = 0;
 
-	if (!hotplug_trigger)
-		return;
-
 	for_each_hpd_pin(i) {
 		if ((hpd[i] & hotplug_trigger) == 0)
 			continue;
@@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				 dig_hotplug_reg, hpd_ibx);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
@@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	int pipe;
 	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
-	u32 dig_hotplug_reg;
-	u32 pin_mask, long_mask;
 
-	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
-	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+	if (hotplug_trigger) {
+		u32 dig_hotplug_reg, pin_mask, long_mask;
 
-	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
-	intel_hpd_irq_handler(dev, pin_mask, long_mask);
+		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
+		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
+		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
+				 dig_hotplug_reg, hpd_cpt);
+		intel_hpd_irq_handler(dev, pin_mask, long_mask);
+	}
 
 	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
 		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
-- 
1.7.10.4

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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[Daniel Vetter]

On Wed, Jul 08, 2015 at 05:07:47PM +0530, Sonika Jindal wrote:
> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
> Handle it only if hpd has actually occurred like we handle other
> interrupts.
> v2: Make few variables local to if block (Ville)
> v3: Add check for ibx/cpt both (Ville).
>     While at it, remove the redundant check for hotplug_trigger from
>     pch_get_hpd_pins
> v4: Indentation (Ville)
> 
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>

Queued for -next, thanks for the patch.
-Daniel

> ---
>  drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
>  1 file changed, 17 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a6fbe64..a897f68 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>  	*pin_mask = 0;
>  	*long_mask = 0;
>  
> -	if (!hotplug_trigger)
> -		return;
> -
>  	for_each_hpd_pin(i) {
>  		if ((hpd[i] & hotplug_trigger) == 0)
>  			continue;
> @@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int pipe;
>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
> -	u32 dig_hotplug_reg;
> -	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +	if (hotplug_trigger) {
> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>  
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> +				 dig_hotplug_reg, hpd_ibx);
> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}
>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
> @@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	int pipe;
>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
> -	u32 dig_hotplug_reg;
> -	u32 pin_mask, long_mask;
>  
> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +	if (hotplug_trigger) {
> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>  
> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
> +				 dig_hotplug_reg, hpd_cpt);
> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
> +	}
>  
>  	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
> -- 
> 1.7.10.4
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH] drm/i915: Handle HPD when it has actually occurred

[Jani Nikula]

On Wed, 08 Jul 2015, Daniel Vetter <daniel@ffwll.ch> wrote:
> On Wed, Jul 08, 2015 at 05:07:47PM +0530, Sonika Jindal wrote:
>> Writing to PCH_PORT_HOTPLUG for each interrupt is not required.
>> Handle it only if hpd has actually occurred like we handle other
>> interrupts.
>> v2: Make few variables local to if block (Ville)
>> v3: Add check for ibx/cpt both (Ville).
>>     While at it, remove the redundant check for hotplug_trigger from
>>     pch_get_hpd_pins
>> v4: Indentation (Ville)
>> 
>> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
>> Signed-off-by: Sonika Jindal <sonika.jindal@intel.com>
>
> Queued for -next, thanks for the patch.

This patch, i.e.

commit aaf5ec2e51ab1d9c5e962b4728a1107ed3ff7a3e
Author: Sonika Jindal <sonika.jindal@intel.com>
Date:   Wed Jul 8 17:07:47 2015 +0530

    drm/i915: Handle HPD when it has actually occurred

causes *tons* of

[drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!

at boot. Suspiciously this happens a lot when doing native AUX on the DP
monitor.

Bug with dmesg is at https://bugs.freedesktop.org/show_bug.cgi?id=92084

BR,
Jani.


> -Daniel
>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c |   32 +++++++++++++++++---------------
>>  1 file changed, 17 insertions(+), 15 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index a6fbe64..a897f68 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -1266,9 +1266,6 @@ static void pch_get_hpd_pins(u32 *pin_mask, u32 *long_mask,
>>  	*pin_mask = 0;
>>  	*long_mask = 0;
>>  
>> -	if (!hotplug_trigger)
>> -		return;
>> -
>>  	for_each_hpd_pin(i) {
>>  		if ((hpd[i] & hotplug_trigger) == 0)
>>  			continue;
>> @@ -1658,14 +1655,17 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir)
>>  	struct drm_i915_private *dev_priv = dev->dev_private;
>>  	int pipe;
>>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK;
>> -	u32 dig_hotplug_reg;
>> -	u32 pin_mask, long_mask;
>>  
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +	if (hotplug_trigger) {
>> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>>  
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_ibx);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
>> +				 dig_hotplug_reg, hpd_ibx);
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>>  
>>  	if (pch_iir & SDE_AUDIO_POWER_MASK) {
>>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK) >>
>> @@ -1757,14 +1757,16 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
>>  	struct drm_i915_private *dev_priv = dev->dev_private;
>>  	int pipe;
>>  	u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT;
>> -	u32 dig_hotplug_reg;
>> -	u32 pin_mask, long_mask;
>>  
>> -	dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> -	I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +	if (hotplug_trigger) {
>> +		u32 dig_hotplug_reg, pin_mask, long_mask;
>>  
>> -	pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger, dig_hotplug_reg, hpd_cpt);
>> -	intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +		dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG);
>> +		I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg);
>> +		pch_get_hpd_pins(&pin_mask, &long_mask, hotplug_trigger,
>> +				 dig_hotplug_reg, hpd_cpt);
>> +		intel_hpd_irq_handler(dev, pin_mask, long_mask);
>> +	}
>>  
>>  	if (pch_iir & SDE_AUDIO_POWER_MASK_CPT) {
>>  		int port = ffs((pch_iir & SDE_AUDIO_POWER_MASK_CPT) >>
>> -- 
>> 1.7.10.4
>> 
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx@lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> -- 
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx

-- 
Jani Nikula, Intel Open Source Technology Center
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