[Intel-gfx] [PATCH 06/10] drm/i915: POSTING_READ(DEIER) on ivybridge_irq_handler

[Mika Kuoppala]

Paulo Zanoni <przanoni at gmail.com> writes:

> From: Paulo Zanoni <paulo.r.zanoni at intel.com>
>
> We have this POSTING_READ inside ironlake_irq_handler. I suppose we
> also want it on IVB because we want to stop the IRQ handler as soon as
> possible at this point.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>

Reviewed-by: Mika Kuoppala <mika.kuoppala at intel.com>

> ---
>  drivers/gpu/drm/i915/i915_irq.c | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 7bc36ae..bdaab93 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1310,6 +1310,7 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
>  	/* disable master interrupt before clearing iir  */
>  	de_ier = I915_READ(DEIER);
>  	I915_WRITE(DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
> +	POSTING_READ(DEIER);
>  
>  	/* Disable south interrupts. We'll only write to SDEIIR once, so further
>  	 * interrupts will will be stored on its back queue, and then we'll be
> -- 
> 1.8.1.2
>
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