linux-kernel - Re: [PATCH v6 02/14] USB: typec: Add cmd timeout and response delay

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Message-ID: <ZRPTHeYhdtdtKZ1/@kuha.fi.intel.com>
Date:   Wed, 27 Sep 2023 10:00:45 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Abdel Alkuor <alkuor@...il.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, bryan.odonoghue@...aro.org,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, conor+dt@...nel.org,
        ryan.eleceng@...il.com
Subject: Re: [PATCH v6 02/14] USB: typec: Add cmd timeout and response delay

On Sat, Sep 23, 2023 at 03:39:47AM -0400, Abdel Alkuor wrote:
> Some commands in tps25750 take longer than 1 second
> to complete, and some responses need some delay before
> the result becomes available.
> 
> Signed-off-by: Abdel Alkuor <alkuor@...il.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
> Changes in v6:
>   - Use tps6598x_exec_cmd as a wrapper
> Changes in v5:
>   - Incorporating tps25750 into tps6598x driver
> 
>  drivers/usb/typec/tipd/core.c | 19 +++++++++++++++----
>  1 file changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 37b56ce75f39..32420c61660d 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -282,9 +282,10 @@ static void tps6598x_disconnect(struct tps6598x *tps, u32 status)
>  	power_supply_changed(tps->psy);
>  }
>  
> -static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
> +static int tps6598x_exec_cmd_tmo(struct tps6598x *tps, const char *cmd,
>  			     size_t in_len, u8 *in_data,
> -			     size_t out_len, u8 *out_data)
> +			     size_t out_len, u8 *out_data,
> +			     u32 cmd_timeout_ms, u32 res_delay_ms)
>  {
>  	unsigned long timeout;
>  	u32 val;
> @@ -307,8 +308,7 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
>  	if (ret < 0)
>  		return ret;
>  
> -	/* XXX: Using 1s for now, but it may not be enough for every command. */
> -	timeout = jiffies + msecs_to_jiffies(1000);
> +	timeout = jiffies + msecs_to_jiffies(cmd_timeout_ms);
>  
>  	do {
>  		ret = tps6598x_read32(tps, TPS_REG_CMD1, &val);
> @@ -321,6 +321,9 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
>  			return -ETIMEDOUT;
>  	} while (val);
>  
> +	/* some commands require delay for the result to be available */
> +	mdelay(res_delay_ms);
> +
>  	if (out_len) {
>  		ret = tps6598x_block_read(tps, TPS_REG_DATA1,
>  					  out_data, out_len);
> @@ -345,6 +348,14 @@ static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
>  	return 0;
>  }
>  
> +static int tps6598x_exec_cmd(struct tps6598x *tps, const char *cmd,
> +			     size_t in_len, u8 *in_data,
> +			     size_t out_len, u8 *out_data)
> +{
> +	return tps6598x_exec_cmd_tmo(tps, cmd, in_len, in_data,
> +				     out_len, out_data, 1000, 0);
> +}
> +
>  static int tps6598x_dr_set(struct typec_port *port, enum typec_data_role role)
>  {
>  	const char *cmd = (role == TYPEC_DEVICE) ? "SWUF" : "SWDF";
> -- 
> 2.34.1

-- 
heikki