[PATCH v2 07/12] drm/panfrost: Reset the GPU when the AS_ACTIVE bit is stuck

[Steven Price]

On 21/06/2021 14:39, Boris Brezillon wrote:
> Things are unlikely to resolve until we reset the GPU. Let's not wait
> for other faults/timeout to happen to trigger this reset.
> 
> Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>

This one still haunts me... ;)

Reviewed-by: Steven Price <steven.price at arm.com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_mmu.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> index d5c624e776f1..d20bcaecb78f 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c
> @@ -36,8 +36,11 @@ static int wait_ready(struct panfrost_device *pfdev, u32 as_nr)
>  	ret = readl_relaxed_poll_timeout_atomic(pfdev->iomem + AS_STATUS(as_nr),
>  		val, !(val & AS_STATUS_AS_ACTIVE), 10, 1000);
>  
> -	if (ret)
> +	if (ret) {
> +		/* The GPU hung, let's trigger a reset */
> +		panfrost_device_schedule_reset(pfdev);
>  		dev_err(pfdev->dev, "AS_ACTIVE bit stuck\n");
> +	}
>  
>  	return ret;
>  }
>