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

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

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
> 
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-- 
Ville Syrjälä
Intel OTC
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