On Thu, Jan 05, 2012 at 11:11:53PM +0100, Daniel Vetter wrote:
> With the new ducttape of much finer quality, this seems to be no
> longer necessary.
>
> Tested on my ivb and snb machine with the usual suspects of testcases.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
> drivers/gpu/drm/i915/i915_irq.c | 11 -----------
> 1 files changed, 0 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
> index b9ba180..af54153 100644
> --- a/drivers/gpu/drm/i915/i915_irq.c
> +++ b/drivers/gpu/drm/i915/i915_irq.c
> @@ -1779,17 +1779,6 @@ static void ironlake_irq_preinstall(struct drm_device *dev)
> INIT_WORK(&dev_priv->rps_work, gen6_pm_rps_work);
>
> I915_WRITE(HWSTAM, 0xeffe);
> - if (IS_GEN6(dev) || IS_GEN7(dev)) {
> - /* Workaround stalls observed on Sandy Bridge GPUs by
> - * making the blitter command streamer generate a
> - * write to the Hardware Status Page for
> - * MI_USER_INTERRUPT. This appears to serialize the
> - * previous seqno write out before the interrupt
> - * happens.
> - */
> - I915_WRITE(GEN6_BLITTER_HWSTAM, ~GEN6_BLITTER_USER_INTERRUPT);
> - I915_WRITE(GEN6_BSD_HWSTAM, ~GEN6_BSD_USER_INTERRUPT);
> - }
>
> /* XXX hotplug from PCH */
>
---
This patch is a requirement for functional simulation on Gen7. It
appears to not break Gen6 afaics. Therefore:
Acked-by: Ben Widawsky <ben at bwidawsk.net>
