Reviewed-by: Rodrigo Vivi <rodrigo.v...@gmail.com>
I liked this very much... we should do this kind of check in more places...
On Tue, Aug 06, 2013 at 06:57:14PM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zan...@intel.com>
>
> I did some brief tests and the "new_val = pmimr" condition usually
> happens a few times after exiting games.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 14 +++++++++-----
> 1 file changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index a00fe05..a1255da 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -142,14 +142,18 @@ static void snb_update_pm_irq(struct drm_i915_private
> *dev_priv,
> uint32_t interrupt_mask,
> uint32_t enabled_irq_mask)
> {
> - uint32_t pmimr = I915_READ(GEN6_PMIMR);
> - pmimr &= ~interrupt_mask;
> - pmimr |= (~enabled_irq_mask & interrupt_mask);
> + uint32_t pmimr, new_val;
>
> assert_spin_locked(&dev_priv->irq_lock);
>
> - I915_WRITE(GEN6_PMIMR, pmimr);
> - POSTING_READ(GEN6_PMIMR);
> + pmimr = new_val = I915_READ(GEN6_PMIMR);
> + new_val &= ~interrupt_mask;
> + new_val |= (~enabled_irq_mask & interrupt_mask);
> +
> + if (new_val != pmimr) {
> + I915_WRITE(GEN6_PMIMR, new_val);
> + POSTING_READ(GEN6_PMIMR);
> + }
> }
>
> void snb_enable_pm_irq(struct drm_i915_private *dev_priv, uint32_t mask)
> --
> 1.8.1.2
>
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