[PATCH v2 1/1] drm/i915/gt: Increase a time to retry RING_HEAD reset

[Andi Shyti]

Hi Nitin,

...

> diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> index 32f3b52a183a..d56410863f26 100644
> --- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> +++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
> @@ -230,8 +230,13 @@ static int xcs_resume(struct intel_engine_cs *engine)
>  
>  	set_pp_dir(engine);
>  
> -	/* First wake the ring up to an empty/idle ring */
> -	for ((kt) = ktime_get() + (2 * NSEC_PER_MSEC);
> +	/*
> +	 * First wake the ring up to an empty/idle ring.
> +	 * Use 50ms of delay to let the engine write successfully
> +	 * for all platforms. Experimented with different values and

I'm going to change /Experimented/Experiments/

Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>

Thanks,
Andi

> +	 * determined that 50ms works best based on testing.
> +	 */
> +	for ((kt) = ktime_get() + (50 * NSEC_PER_MSEC);
>  			ktime_before(ktime_get(), (kt)); cpu_relax()) {
>  		/*
>  		 * In case of resets fails because engine resumes from
> -- 
> 2.25.1