[Intel-gfx] [PATCH v2 1/7] drm/i915: Refactor gmch hpd irq handling

[Chris Wilson]

On Tue, Apr 01, 2014 at 10:54:36AM +0300, ville.syrjala at linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Pull all the gmch platform hotplug interrupt handling into one
> function.
> 
> v2: Move the IIR check to the caller
>     s/drm_i915_private_t/struct drm_i915_private/
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

With the addition of the comment before the posting-read,
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>

> ---
>  drivers/gpu/drm/i915/i915_irq.c | 69 ++++++++++++++++++-----------------------
>  1 file changed, 30 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 0858189..361e9b3 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1647,6 +1647,29 @@ static void valleyview_pipestat_irq_handler(struct drm_device *dev, u32 iir)
>  		gmbus_irq_handler(dev);
>  }
>  
> +static void i9xx_hpd_irq_handler(struct drm_device *dev)
> +{
> +	struct drm_i915_private *dev_priv = dev->dev_private;
> +	u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
> +
> +	if (IS_G4X(dev)) {
> +		u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_G4X;
> +
> +		intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_g4x);
> +	} else {
> +		u32 hotplug_trigger = hotplug_status & HOTPLUG_INT_STATUS_I915;
> +
> +		intel_hpd_irq_handler(dev, hotplug_trigger, hpd_status_i915);
> +	}
> +
> +	if ((IS_G4X(dev) || IS_VALLEYVIEW(dev)) &&
> +	    hotplug_status & DP_AUX_CHANNEL_MASK_INT_STATUS_G4X)
> +		dp_aux_irq_handler(dev);
> +
> +	I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);

/* Make sure hotplug status is cleared before we clear IIR,
 * or else we may miss hotplug events.
 */
> +	POSTING_READ(PORT_HOTPLUG_STAT);
> +}
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre