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

["Jindal, Sonika" <sonika.jindal@intel.com>]

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
>>
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>
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