[Intel-gfx] [PATCH] drm/i915/execlists: Skip resetting RING_CONTEXT_STATUS_PTR

[Mika Kuoppala]

Chris Wilson <chris at chris-wilson.co.uk> writes:

> As we now flag when the GPU signals a context-switch and do not read the
> status register before we see that signal, we do not have to ensure that
> it is cleared upon reset (and can leave it to the GPU to reset it from
> the power context).
>
> Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> Cc: Mika Kuoppala <mika.kuoppala at intel.com>
> Cc: Tvrtko Ursulin <tursulin at ursulin.net>

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

> ---
>  drivers/gpu/drm/i915/intel_lrc.c | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
> index 0e99d53d5523..753458452997 100644
> --- a/drivers/gpu/drm/i915/intel_lrc.c
> +++ b/drivers/gpu/drm/i915/intel_lrc.c
> @@ -1317,7 +1317,6 @@ static int gen9_init_render_ring(struct intel_engine_cs *engine)
>  static void reset_common_ring(struct intel_engine_cs *engine,
>  			      struct drm_i915_gem_request *request)
>  {
> -	struct drm_i915_private *dev_priv = engine->i915;
>  	struct execlist_port *port = engine->execlist_port;
>  	struct intel_context *ce = &request->ctx->engine[engine->id];
>  
> @@ -1344,7 +1343,6 @@ static void reset_common_ring(struct intel_engine_cs *engine,
>  		return;
>  
>  	/* Catch up with any missed context-switch interrupts */
> -	I915_WRITE(RING_CONTEXT_STATUS_PTR(engine), _MASKED_FIELD(0xffff, 0));
>  	if (request->ctx != port[0].request->ctx) {
>  		i915_gem_request_put(port[0].request);
>  		port[0] = port[1];
> -- 
> 2.11.0