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Date:   Wed, 2 Jun 2021 10:04:10 -0600
From:   Mathieu Poirier <mathieu.poirier@linaro.org>
To:     Suman Anna <s-anna@ti.com>
Cc:     Bjorn Andersson <bjorn.andersson@linaro.org>,
        Lokesh Vutla <lokeshvutla@ti.com>,
        Tero Kristo <kristo@kernel.org>,
        linux-remoteproc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 5/6] remoteproc: k3-dsp: Refactor mbox request code in
 start
Message-ID: <20210602160410.GA1797307@xps15>
References: <20210522000309.26134-1-s-anna@ti.com>
 <20210522000309.26134-6-s-anna@ti.com>
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On Fri, May 21, 2021 at 07:03:08PM -0500, Suman Anna wrote:
> Refactor out the mailbox request and associated ping logic code
> from k3_dsp_rproc_start() function into its own separate function
> so that it can be re-used in the soon to be added .attach() ops
> callback.
> 
> Signed-off-by: Suman Anna <s-anna@ti.com>
> ---
>  drivers/remoteproc/ti_k3_dsp_remoteproc.c | 65 ++++++++++++++---------
>  1 file changed, 39 insertions(+), 26 deletions(-)

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

> 
> diff --git a/drivers/remoteproc/ti_k3_dsp_remoteproc.c b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> index fd4eb67a6681..faf60a274e8d 100644
> --- a/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> +++ b/drivers/remoteproc/ti_k3_dsp_remoteproc.c
> @@ -216,6 +216,43 @@ static int k3_dsp_rproc_release(struct k3_dsp_rproc *kproc)
>  	return ret;
>  }
>  
> +static int k3_dsp_rproc_request_mbox(struct rproc *rproc)
> +{
> +	struct k3_dsp_rproc *kproc = rproc->priv;
> +	struct mbox_client *client = &kproc->client;
> +	struct device *dev = kproc->dev;
> +	int ret;
> +
> +	client->dev = dev;
> +	client->tx_done = NULL;
> +	client->rx_callback = k3_dsp_rproc_mbox_callback;
> +	client->tx_block = false;
> +	client->knows_txdone = false;
> +
> +	kproc->mbox = mbox_request_channel(client, 0);
> +	if (IS_ERR(kproc->mbox)) {
> +		ret = -EBUSY;
> +		dev_err(dev, "mbox_request_channel failed: %ld\n",
> +			PTR_ERR(kproc->mbox));
> +		return ret;
> +	}
> +
> +	/*
> +	 * Ping the remote processor, this is only for sanity-sake for now;
> +	 * there is no functional effect whatsoever.
> +	 *
> +	 * Note that the reply will _not_ arrive immediately: this message
> +	 * will wait in the mailbox fifo until the remote processor is booted.
> +	 */
> +	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> +	if (ret < 0) {
> +		dev_err(dev, "mbox_send_message failed: %d\n", ret);
> +		mbox_free_channel(kproc->mbox);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
>  /*
>   * The C66x DSP cores have a local reset that affects only the CPU, and a
>   * generic module reset that powers on the device and allows the DSP internal
> @@ -273,37 +310,13 @@ static int k3_dsp_rproc_unprepare(struct rproc *rproc)
>  static int k3_dsp_rproc_start(struct rproc *rproc)
>  {
>  	struct k3_dsp_rproc *kproc = rproc->priv;
> -	struct mbox_client *client = &kproc->client;
>  	struct device *dev = kproc->dev;
>  	u32 boot_addr;
>  	int ret;
>  
> -	client->dev = dev;
> -	client->tx_done = NULL;
> -	client->rx_callback = k3_dsp_rproc_mbox_callback;
> -	client->tx_block = false;
> -	client->knows_txdone = false;
> -
> -	kproc->mbox = mbox_request_channel(client, 0);
> -	if (IS_ERR(kproc->mbox)) {
> -		ret = -EBUSY;
> -		dev_err(dev, "mbox_request_channel failed: %ld\n",
> -			PTR_ERR(kproc->mbox));
> +	ret = k3_dsp_rproc_request_mbox(rproc);
> +	if (ret)
>  		return ret;
> -	}
> -
> -	/*
> -	 * Ping the remote processor, this is only for sanity-sake for now;
> -	 * there is no functional effect whatsoever.
> -	 *
> -	 * Note that the reply will _not_ arrive immediately: this message
> -	 * will wait in the mailbox fifo until the remote processor is booted.
> -	 */
> -	ret = mbox_send_message(kproc->mbox, (void *)RP_MBOX_ECHO_REQUEST);
> -	if (ret < 0) {
> -		dev_err(dev, "mbox_send_message failed: %d\n", ret);
> -		goto put_mbox;
> -	}
>  
>  	boot_addr = rproc->bootaddr;
>  	if (boot_addr & (kproc->data->boot_align_addr - 1)) {
> -- 
> 2.30.1
>