[PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[Jesse Barnes]

We were apparently relying on the defaults on BDW, which resulted in no
hotplug or AUX interrupts.

References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_irq.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 261254a..f88e265 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2763,13 +2763,15 @@ static void ibx_irq_postinstall(struct drm_device *dev)
 		mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
 		       SDE_TRANSA_FIFO_UNDER | SDE_POISON;
 	} else {
-		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
+		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT |
+			SDE_HOTPLUG_MASK_CPT;
 
 		I915_WRITE(SERR_INT, I915_READ(SERR_INT));
 	}
 
 	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
 	I915_WRITE(SDEIMR, ~mask);
+	I915_WRITE(SDEIER, mask);
 }
 
 static void gen5_gt_irq_postinstall(struct drm_device *dev)
-- 
1.8.3.2

[PATCH 2/2] drm/i915: get proper hwrawclk freq on BDW

[Jesse Barnes]

We need to read out the CDclk to calculate the DP aux divider correctly.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/intel_dp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7df5085..4ac1da5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -214,6 +214,9 @@ intel_hrawclk(struct drm_device *dev)
 	if (IS_VALLEYVIEW(dev))
 		return 200;
 
+	if (IS_BROADWELL(dev))
+		return intel_ddi_get_cdclk_freq(dev_priv) / 1000;
+
 	clkcfg = I915_READ(CLKCFG);
 	switch (clkcfg & CLKCFG_FSB_MASK) {
 	case CLKCFG_FSB_400:
-- 
1.8.3.2

Re: [PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[Jesse Barnes]

On Fri, 10 Jan 2014 13:02:20 -0800
Jesse Barnes <jbarnes@virtuousgeek.org> wrote:

> We were apparently relying on the defaults on BDW, which resulted in no
> hotplug or AUX interrupts.
> 
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 261254a..f88e265 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2763,13 +2763,15 @@ static void ibx_irq_postinstall(struct drm_device *dev)
>  		mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
>  		       SDE_TRANSA_FIFO_UNDER | SDE_POISON;
>  	} else {
> -		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
> +		mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT |
> +			SDE_HOTPLUG_MASK_CPT;
>  
>  		I915_WRITE(SERR_INT, I915_READ(SERR_INT));
>  	}
>  
>  	I915_WRITE(SDEIIR, I915_READ(SDEIIR));
>  	I915_WRITE(SDEIMR, ~mask);
> +	I915_WRITE(SDEIER, mask);
>  }
>  
>  static void gen5_gt_irq_postinstall(struct drm_device *dev)

Note we still don't handle port A interrupts.  Not sure if that's
important since we don't really use them yet, but if we want to add
that we'd probably need to add some new code to the hpd functions to
deal with walking both CPU and PCH masks.

-- 
Jesse Barnes, Intel Open Source Technology Center

Re: [PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[Paulo Zanoni]

2014/1/10 Jesse Barnes <jbarnes@virtuousgeek.org>:
> On Fri, 10 Jan 2014 13:02:20 -0800
> Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
>
>> We were apparently relying on the defaults on BDW, which resulted in no
>> hotplug or AUX interrupts.
>>
>> References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
>> References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
>> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index 261254a..f88e265 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -2763,13 +2763,15 @@ static void ibx_irq_postinstall(struct drm_device *dev)
>>               mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
>>                      SDE_TRANSA_FIFO_UNDER | SDE_POISON;
>>       } else {
>> -             mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
>> +             mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT |
>> +                     SDE_HOTPLUG_MASK_CPT;
>>
>>               I915_WRITE(SERR_INT, I915_READ(SERR_INT));
>>       }
>>
>>       I915_WRITE(SDEIIR, I915_READ(SDEIIR));
>>       I915_WRITE(SDEIMR, ~mask);
>> +     I915_WRITE(SDEIER, mask);
>>  }
>>
>>  static void gen5_gt_irq_postinstall(struct drm_device *dev)
>
> Note we still don't handle port A interrupts.  Not sure if that's
> important since we don't really use them yet, but if we want to add
> that we'd probably need to add some new code to the hpd functions to
> deal with walking both CPU and PCH masks.

All the previous gens also lack this and things kinda work so far...
The BIOS sets some state, and we lose it after suspend. Of course, I'm
not suggesting we should keep it like this :)


>
> --
> Jesse Barnes, Intel Open Source Technology Center
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx



-- 
Paulo Zanoni

Re: [PATCH 1/2] drm/i915: make sure south port interrupts are enabled properly

[Paulo Zanoni]

2014/1/10 Jesse Barnes <jbarnes@virtuousgeek.org>:
> We were apparently relying on the defaults on BDW, which resulted in no
> hotplug or AUX interrupts.
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> ---
>  drivers/gpu/drm/i915/i915_irq.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 261254a..f88e265 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2763,13 +2763,15 @@ static void ibx_irq_postinstall(struct drm_device *dev)
>                 mask = SDE_GMBUS | SDE_AUX_MASK | SDE_TRANSB_FIFO_UNDER |
>                        SDE_TRANSA_FIFO_UNDER | SDE_POISON;
>         } else {
> -               mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
> +               mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT |
> +                       SDE_HOTPLUG_MASK_CPT;
>
>                 I915_WRITE(SERR_INT, I915_READ(SERR_INT));
>         }
>
>         I915_WRITE(SDEIIR, I915_READ(SDEIIR));
>         I915_WRITE(SDEIMR, ~mask);
> +       I915_WRITE(SDEIER, mask);

ibx_irq_preinstall contains a nice comment explaining why SDEIER needs
to be 0xffffffff.

I think the proper solution to your bug is probably to call
ibx_irq_preinstall from gen8_irq_preinstall.

>  }
>
>  static void gen5_gt_irq_postinstall(struct drm_device *dev)
> --
> 1.8.3.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx



-- 
Paulo Zanoni

[PATCH] drm/i915/bdw: make sure south port interrupts are enabled properly v2

[Jesse Barnes]

We were apparently relying on the defaults on BDW, which resulted in no
hotplug or AUX interrupts.  So be sure to call the ibx_irq_preinstall to
enable all interrupts.

v2: use preinstall instead of redundant SDIER write

References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
---
 drivers/gpu/drm/i915/i915_irq.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 261254a..69b0b71 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2714,6 +2714,8 @@ static void gen8_irq_preinstall(struct drm_device *dev)
 #undef GEN8_IRQ_INIT_NDX
 
 	POSTING_READ(GEN8_PCU_IIR);
+
+	ibx_irq_preinstall(dev);
 }
 
 static void ibx_hpd_irq_setup(struct drm_device *dev)
-- 
1.8.3.2

Re: [PATCH] drm/i915/bdw: make sure south port interrupts are enabled properly v2

[Paulo Zanoni]

2014/1/10 Jesse Barnes <jbarnes@virtuousgeek.org>:
> We were apparently relying on the defaults on BDW, which resulted in no
> hotplug or AUX interrupts.  So be sure to call the ibx_irq_preinstall to
> enable all interrupts.
>
> v2: use preinstall instead of redundant SDIER write
>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
> References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

And this should probably go to Kernel 3.13 too, right?

Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

> ---
>  drivers/gpu/drm/i915/i915_irq.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 261254a..69b0b71 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2714,6 +2714,8 @@ static void gen8_irq_preinstall(struct drm_device *dev)
>  #undef GEN8_IRQ_INIT_NDX
>
>         POSTING_READ(GEN8_PCU_IIR);
> +
> +       ibx_irq_preinstall(dev);
>  }
>
>  static void ibx_hpd_irq_setup(struct drm_device *dev)
> --
> 1.8.3.2
>
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx



-- 
Paulo Zanoni

Re: [PATCH] drm/i915/bdw: make sure south port interrupts are enabled properly v2

[Jesse Barnes]

On Fri, 10 Jan 2014 19:17:02 -0200
Paulo Zanoni <przanoni@gmail.com> wrote:

> 2014/1/10 Jesse Barnes <jbarnes@virtuousgeek.org>:
> > We were apparently relying on the defaults on BDW, which resulted in no
> > hotplug or AUX interrupts.  So be sure to call the ibx_irq_preinstall to
> > enable all interrupts.
> >
> > v2: use preinstall instead of redundant SDIER write
> >
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=72834
> > References: https://bugs.freedesktop.org/show_bug.cgi?id=72833
> > Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
> 
> And this should probably go to Kernel 3.13 too, right?
> 
> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>

Yeah probably.

Daniel, please cc:stable

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center