[Intel-gfx] [PATCH 1/2] drm/i915: Disable MI_SET_CONTEXT psmi w/a for bdw

[Michał Winiarski]

On Fri, Mar 24, 2017 at 03:17:23PM +0000, Chris Wilson wrote:
> The current w/a for the gen7 psmi related hangs doesn't apply to bdw, so
> disable it if using bdw ringbuffer submission.
> 
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> ---
>  drivers/gpu/drm/i915/i915_gem_context.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> index e8dc3e74c093..68dc81aee2f1 100644
> --- a/drivers/gpu/drm/i915/i915_gem_context.c
> +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> @@ -660,7 +660,7 @@ mi_set_context(struct drm_i915_gem_request *req, u32 flags)
>  	enum intel_engine_id id;
>  	const int num_rings =
>  		/* Use an extended w/a on ivb+ if signalling from other rings */

The comment also needs updating, we're only using extended w/a (not just
disabling arbitration) for gen7.

With that:

Reviewed-by: Michał Winiarski <michal.winiarski at intel.com>

-Michał

> -		i915.semaphores ?
> +		(i915.semaphores && INTEL_GEN(dev_priv) == 7) ?
>  		INTEL_INFO(dev_priv)->num_rings - 1 :
>  		0;
>  	int len;
> -- 
> 2.11.0
> 
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