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

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Message-ID: <ZRPXLBj/Y6+yiwf8@kuha.fi.intel.com>
Date:   Wed, 27 Sep 2023 10:18:04 +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 Wed, Sep 27, 2023 at 10:00:50AM +0300, Heikki Krogerus wrote:
> 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>

Hold on!

You are not specifying the driver in the subject. You need to fix
that.

> > ---
> > 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

-- 
heikki