Re: [PATCH] media: mali-c55: fail power-on when safe stop times out

[Jacopo Mondi]

Hello Pengpeng

On Sun, Aug 30, 2026 at 09:46:09PM +0800, Pengpeng Hou wrote:
> The power-on path requests safe stop to establish a non-streaming state but
> ignores the polling result and publishes runtime resume success.
>
> Power the block back off and propagate a safe-stop timeout.
>
> Fixes: d5f281f3dd29 ("media: mali-c55: Add Mali-C55 ISP driver")

I'll add
Cc: stable@xxxxxxxxxxxxxxx

> Signed-off-by: Pengpeng Hou <pengpeng@xxxxxxxxxxx>

Reviewed-by: Jacopo Mondi <jacopo.mondi@xxxxxxxxxxxxxxxx>
> ---
>  drivers/media/platform/arm/mali-c55/mali-c55-core.c | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/platform/arm/mali-c55/mali-c55-core.c b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
> index f28e9f4354aca..288fba4831808 100644
> --- a/drivers/media/platform/arm/mali-c55/mali-c55-core.c
> +++ b/drivers/media/platform/arm/mali-c55/mali-c55-core.c
> @@ -730,8 +730,13 @@ static int __mali_c55_power_on(struct mali_c55 *mali_c55)
>  	/* Set safe stop to ensure we're in a non-streaming state */
>  	mali_c55_write(mali_c55, MALI_C55_REG_INPUT_MODE_REQUEST,
>  		       MALI_C55_INPUT_SAFE_STOP);
> -	readl_poll_timeout(mali_c55->base + MALI_C55_REG_MODE_STATUS,
> -			   val, !val, 10 * USEC_PER_MSEC, 250 * USEC_PER_MSEC);
> +	ret = readl_poll_timeout(mali_c55->base + MALI_C55_REG_MODE_STATUS,
> +				 val, !val, 10 * USEC_PER_MSEC, 250 * USEC_PER_MSEC);
> +	if (ret) {
> +		dev_err(mali_c55->dev, "safe stop timed out\n");
> +		__mali_c55_power_off(mali_c55);
> +		return ret;
> +	}
>
>  	return 0;
>  }
>
> base-commit: 08dbfad3f5040f5bdb6c529da20d6d4e81fefd72
> --
> 2.50.1
>
>