linux-kernel - Re: [PATCH v5 6/6] remoteproc: pru: add support for configuring GPMUX based on client setup

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Date:   Tue, 19 Jul 2022 10:16:25 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Puranjay Mohan <p-mohan@...com>
Cc:     linux-kernel@...r.kernel.org, bjorn.andersson@...aro.org,
        krzysztof.kozlowski+dt@...aro.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        nm@...com, ssantosh@...nel.org, s-anna@...com,
        linux-arm-kernel@...ts.infradead.org, rogerq@...nel.org,
        grygorii.strashko@...com, vigneshr@...com, kishon@...com,
        robh@...nel.org
Subject: Re: [PATCH v5 6/6] remoteproc: pru: add support for configuring
 GPMUX based on client setup

On Tue, Jun 07, 2022 at 10:26:50AM +0530, Puranjay Mohan wrote:
> From: Tero Kristo <t-kristo@...com>
> 
> Client device node property ti,pruss-gp-mux-sel can now be used to
> configure the GPMUX config value for PRU.
> 
> Signed-off-by: Tero Kristo <t-kristo@...com>
> [s-anna@...com: simplify the pru id usage]
> Signed-off-by: Suman Anna <s-anna@...com>
> Signed-off-by: Puranjay Mohan <p-mohan@...com>
> ---
> V4->v5
> * This patch was included in v4 and had some checkpatch errors that have
>   been resolved in v5
> ---
>  drivers/remoteproc/pru_rproc.c | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
> index 2977eb50631b..f2c6c55f0f20 100644
> --- a/drivers/remoteproc/pru_rproc.c
> +++ b/drivers/remoteproc/pru_rproc.c
> @@ -123,6 +123,7 @@ struct pru_private_data {
>   * @dbg_single_step: debug state variable to set PRU into single step mode
>   * @dbg_continuous: debug state variable to restore PRU execution mode
>   * @evt_count: number of mapped events
> + * @gpmux_save: saved value for gpmux config
>   */
>  struct pru_rproc {
>  	int id;
> @@ -141,6 +142,7 @@ struct pru_rproc {
>  	u32 dbg_single_step;
>  	u32 dbg_continuous;
>  	u8 evt_count;
> +	u8 gpmux_save;
>  };
>  
>  static inline u32 pru_control_read_reg(struct pru_rproc *pru, unsigned int reg)
> @@ -250,6 +252,7 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
>  	struct device *dev;
>  	const char *fw_name;
>  	int ret;
> +	u32 mux;
>  
>  	try_module_get(THIS_MODULE);
>  
> @@ -273,6 +276,22 @@ struct rproc *pru_rproc_get(struct device_node *np, int index,
>  
>  	mutex_unlock(&pru->lock);
>  
> +	ret = pruss_cfg_get_gpmux(pru->pruss, pru->id, &pru->gpmux_save);
> +	if (ret) {
> +		dev_err(dev, "failed to get cfg gpmux: %d\n", ret);
> +		goto err;
> +	}
> +
> +	ret = of_property_read_u32_index(np, "ti,pruss-gp-mux-sel", index,
> +					 &mux);
> +	if (!ret) {
> +		ret = pruss_cfg_set_gpmux(pru->pruss, pru->id, mux);
> +		if (ret) {
> +			dev_err(dev, "failed to set cfg gpmux: %d\n", ret);
> +			goto err;
> +		}
> +	}
> +
>  	if (pru_id)
>  		*pru_id = pru->id;
>  
> @@ -310,6 +329,7 @@ void pru_rproc_put(struct rproc *rproc)
>  
>  	pru = rproc->priv;
>  
> +	pruss_cfg_set_gpmux(pru->pruss, pru->id, pru->gpmux_save);
>  	pru_rproc_set_firmware(rproc, NULL);
>

  CC      drivers/remoteproc/pru_rproc.o
/home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c: In function ‘pru_rproc_get’:
/home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:279:8: error: implicit declaration of function ‘pruss_cfg_get_gpmux’ [-Werror=implicit-function-declaration]
  279 |  ret = pruss_cfg_get_gpmux(pru->pruss, pru->id, &pru->gpmux_save);
      |        ^~~~~~~~~~~~~~~~~~~
/home/mpoirier/work/remoteproc/kernel-review/drivers/remoteproc/pru_rproc.c:288:9: error: implicit declaration of function ‘pruss_cfg_set_gpmux’ [-Werror=implicit-function-declaration]
  288 |   ret = pruss_cfg_set_gpmux(pru->pruss, pru->id, mux);
      |         ^~~~~~~~~~~~~~~~~~~

I get this on both rproc-next and today's linux next.  

>  	mutex_lock(&pru->lock);
> -- 
> 2.17.1
>