On Fri, Mar 07, 2014 at 08:10:25PM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
>
> The SERR_INT register is very similar to the other IIR registers, so
> let's zero it at preinstall/uninstall and WARN for a non-zero value at
> postinstall, just like we do with the other IIR registers. For this
> one, there's no need to double-clear since it can't store more than
> one interrupt.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Without the assert that I don't like, this is
Reviewed-by: Ben Widawsky <ben@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 8 ++++++--
> 1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index 4d0a8b1..d295624 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -2811,6 +2811,10 @@ static void ibx_irq_preinstall(struct drm_device *dev)
> return;
>
> GEN5_IRQ_RESET(SDE);
> +
> + if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
> + I915_WRITE(SERR_INT, 0xffffffff);
> +
> /*
> * SDEIER is also touched by the interrupt handler to work around missed
> * PCH interrupts. Hence we can't update it after the interrupt handler
> @@ -2949,7 +2953,7 @@ static void ibx_irq_postinstall(struct drm_device *dev)
> } else {
> mask = SDE_GMBUS_CPT | SDE_AUX_MASK_CPT | SDE_ERROR_CPT;
>
> - I915_WRITE(SERR_INT, I915_READ(SERR_INT));
> + GEN5_ASSERT_IIR_IS_ZERO(SERR_INT);
> }
>
> GEN5_ASSERT_IIR_IS_ZERO(SDEIIR);
> @@ -3303,7 +3307,7 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
>
> GEN5_IRQ_RESET(SDE);
> if (HAS_PCH_CPT(dev) || HAS_PCH_LPT(dev))
> - I915_WRITE(SERR_INT, I915_READ(SERR_INT));
> + I915_WRITE(SERR_INT, 0xffffffff);
> }
>
> static void i8xx_irq_preinstall(struct drm_device * dev)
> --
> 1.8.5.3
>
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--
Ben Widawsky, Intel Open Source Technology Center
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