linux-kernel - Re: [PATCH v4 6/9] remoteproc: Refactor function rproc

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Date:   Mon, 22 Jun 2020 00:25:25 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, loic.pallardy@...com,
        arnaud.pouliquen@...com, s-anna@...com
Subject: Re: [PATCH v4 6/9] remoteproc: Refactor function rproc_boot()

On Mon 01 Jun 10:51 PDT 2020, Mathieu Poirier wrote:

> Refactor function rproc_boot() to properly deal with scenarios
> where the remoteproc core needs to attach with a remote
> processor that has already been booted by an external entity.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

Regards,
Bjorn

> ---
>  drivers/remoteproc/remoteproc_core.c | 28 +++++++++++++++++-----------
>  1 file changed, 17 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 0be8343dd851..48ddc29814be 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1503,7 +1503,7 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw)
>   * Attach to remote processor - similar to rproc_fw_boot() but without
>   * the steps that deal with the firmware image.
>   */
> -static int __maybe_unused rproc_actuate(struct rproc *rproc)
> +static int rproc_actuate(struct rproc *rproc)
>  {
>  	struct device *dev = &rproc->dev;
>  	int ret;
> @@ -1923,24 +1923,30 @@ int rproc_boot(struct rproc *rproc)
>  		goto unlock_mutex;
>  	}
>  
> -	/* skip the boot process if rproc is already powered up */
> +	/* skip the boot or attach process if rproc is already powered up */
>  	if (atomic_inc_return(&rproc->power) > 1) {
>  		ret = 0;
>  		goto unlock_mutex;
>  	}
>  
> -	dev_info(dev, "powering up %s\n", rproc->name);
> +	if (rproc->state == RPROC_DETACHED) {
> +		dev_info(dev, "attaching to %s\n", rproc->name);
>  
> -	/* load firmware */
> -	ret = request_firmware(&firmware_p, rproc->firmware, dev);
> -	if (ret < 0) {
> -		dev_err(dev, "request_firmware failed: %d\n", ret);
> -		goto downref_rproc;
> -	}
> +		ret = rproc_actuate(rproc);
> +	} else {
> +		dev_info(dev, "powering up %s\n", rproc->name);
>  
> -	ret = rproc_fw_boot(rproc, firmware_p);
> +		/* load firmware */
> +		ret = request_firmware(&firmware_p, rproc->firmware, dev);
> +		if (ret < 0) {
> +			dev_err(dev, "request_firmware failed: %d\n", ret);
> +			goto downref_rproc;
> +		}
>  
> -	release_firmware(firmware_p);
> +		ret = rproc_fw_boot(rproc, firmware_p);
> +
> +		release_firmware(firmware_p);
> +	}
>  
>  downref_rproc:
>  	if (ret)
> -- 
> 2.20.1
>