[PATCH] power: regulator: Fix an handling error about EALREADY

[Jaehoon Chung]

> -----Original Message-----
> From: Jonas Karlman <jonas at kwiboo.se>
> Sent: Wednesday, November 1, 2023 4:47 PM
> To: Jaehoon Chung <jh80.chung at samsung.com>
> Cc: sjg at chromium.org; patrice.chotard at foss.st.com; eugen.hristev at collabora.com; trini at konsulko.com; u-
> boot at lists.denx.de
> Subject: Re: [PATCH] power: regulator: Fix an handling error about EALREADY
> 
> On 2023-11-01 08:23, Jaehoon Chung wrote:
> > If reegulator is already enabled, it will be return to EALREADY.
> > But driver that its function is called can notice as error, even though
> > it's working fine.
> >
> > Fixes: 4fcba5d556b ("regulator: implement basic reference counter")
> >
> > Signed-off-by: Jaehoon Chung <jh80.chung at samsung.com>
> > ---
> >  drivers/power/regulator/regulator-uclass.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> >
> > diff --git a/drivers/power/regulator/regulator-uclass.c b/drivers/power/regulator/regulator-uclass.c
> > index 3a6ba69f6d5f..fc1c3eb93c9d 100644
> > --- a/drivers/power/regulator/regulator-uclass.c
> > +++ b/drivers/power/regulator/regulator-uclass.c
> > @@ -187,6 +187,10 @@ int regulator_set_enable(struct udevice *dev, bool enable)
> >  		}
> >  	}
> >
> > +	/* Regulator is already enabled */
> > +	if (ret == -EALREADY)
> > +		return 0;
> > +
> 
> Use of regulator_set_enable_if_allowed() will cover this error,
> and regulator_set_enable() should continue to return this error.

When I have checked on my target, It seems that it can't cover all cases.

On odroid-c4, USB doesn't work, even though its regulator is enabled.

=> ums 0 mmc 0
UMS: LUN 0, dev mmc 0, hwpart 0, sector 0x0, count 0x1dacc00
No USB device found
Couldn't init USB controller.


Best Regards,
Jaehoon Chung

> 
> Regards,
> Jonas
> 
> >  	return ret;
> >  }
> >