linux-kernel - Re: [PATCH v5 03/15] USB: typec: Add patch mode to tps6598x

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Message-ID: <ZQsE2r5ws7gWlByN@primary>
Date:   Wed, 20 Sep 2023 10:42:34 -0400
From:   Abdel Alkuor <alkuor@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.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,
        conor+dt@...nel.org, linux-kernel@...r.kernel.org,
        abdelalkuor@...tab.com
Subject: Re: [PATCH v5 03/15] USB: typec: Add patch mode to tps6598x

On Mon, Sep 18, 2023 at 02:07:44PM +0300, Heikki Krogerus wrote:
> On Sun, Sep 17, 2023 at 11:26:27AM -0400, Abdel Alkuor wrote:
> > TPS25750 has a patch mode indicating the device requires
> > a configuration to get the device into operational mode
> > 
> > Signed-off-by: Abdel Alkuor <alkuor@...il.com>
> > ---
> >  drivers/usb/typec/tipd/core.c | 12 +++++++++---
> >  1 file changed, 9 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> > index a8aee4e1aeba..6d2151325fbb 100644
> > --- a/drivers/usb/typec/tipd/core.c
> > +++ b/drivers/usb/typec/tipd/core.c
> > @@ -68,6 +68,7 @@ enum {
> >  	TPS_MODE_BOOT,
> >  	TPS_MODE_BIST,
> >  	TPS_MODE_DISC,
> > +	TPS_MODE_PTCH,
> >  };
> >  
> >  static const char *const modes[] = {
> > @@ -75,6 +76,7 @@ static const char *const modes[] = {
> >  	[TPS_MODE_BOOT]	= "BOOT",
> >  	[TPS_MODE_BIST]	= "BIST",
> >  	[TPS_MODE_DISC]	= "DISC",
> > +	[TPS_MODE_PTCH] = "PTCH",
> >  };
> >  
> >  /* Unrecognized commands will be replaced with "!CMD" */
> > @@ -576,7 +578,7 @@ static void tps6598x_poll_work(struct work_struct *work)
> >  			   &tps->wq_poll, msecs_to_jiffies(POLL_INTERVAL));
> >  }
> >  
> > -static int tps6598x_check_mode(struct tps6598x *tps)
> > +static int tps6598x_check_mode(struct tps6598x *tps, u8 *curr_mode)
> >  {
> >  	char mode[5] = { };
> >  	int ret;
> > @@ -585,8 +587,11 @@ static int tps6598x_check_mode(struct tps6598x *tps)
> >  	if (ret)
> >  		return ret;
> >  
> > -	switch (match_string(modes, ARRAY_SIZE(modes), mode)) {
> > +	*curr_mode = match_string(modes, ARRAY_SIZE(modes), mode);
> > +
> > +	switch (*curr_mode) {
> >  	case TPS_MODE_APP:
> > +	case TPS_MODE_PTCH:
> 
> This check is OK, but it seems that you are not using that curr_mode
> for anything yet, so don't change the paramaters of this function in
> this patch.
> 
> I would also just return the mode. Then this function would be used
> like this:
> 
>         ret = tps6598x_check_mode(...)
>         if (ret < 0)
>                 return ret;
> 
> Now mode = ret.
> 
> >  		return 0;
> >  	case TPS_MODE_BOOT:
> >  		dev_warn(tps->dev, "dead-battery condition\n");
> > @@ -715,6 +720,7 @@ static int tps6598x_probe(struct i2c_client *client)
> >  	u32 vid;
> >  	int ret;
> >  	u64 mask1;
> > +	u8 mode;
> >  
> >  	tps = devm_kzalloc(&client->dev, sizeof(*tps), GFP_KERNEL);
> >  	if (!tps)
> > @@ -759,7 +765,7 @@ static int tps6598x_probe(struct i2c_client *client)
> >  
> >  	tps->irq_handler = irq_handler;
> >  	/* Make sure the controller has application firmware running */
> > -	ret = tps6598x_check_mode(tps);
> > +	ret = tps6598x_check_mode(tps, &mode);
> 
> Actually, if you need to know the mode in here later, then I'm not
> sure tps6592x_check_mode() is useful after that. This is the only
> place it's called. Just read and check the mode in here directly at
> that point.

I will return the mode and check ret directly.
> 
> thanks,
> 
> -- 
> heikki

Thanks,
Abdel