From: Biwen Li <biwen.li@nxp.com>
To: Leo Li <leoyang.li@nxp.com>,
"a.zummo@towertech.it" <a.zummo@towertech.it>,
"alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>
Cc: "linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: rtc: pcf85363/pcf85263: fix error that failed to run hwclock -w
Date: Thu, 15 Aug 2019 04:14:51 +0000 [thread overview]
Message-ID: <DB7PR04MB449054F05411CBDC935605F28FAC0@DB7PR04MB4490.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <VE1PR04MB66875AF7A38BF43351970EB08FAD0@VE1PR04MB6687.eurprd04.prod.outlook.com>
> > Subject: rtc: pcf85363/pcf85263: fix error that failed to run hwclock
> > -w
> >
> > Issue:
> > # hwclock -w
> > hwclock: RTC_SET_TIME: Invalid argument
> >
> > The patch fixes error when run command hwclock -w with rtc
> > pcf85363/pcf85263
>
> Can you explain a little bit more in the commit message on how the changes fix
> the above issue? It is not that clear just from the code.
1. Relative patch: https://lkml.org/lkml/2019/4/3/55 , this patch will always
check for unwritable registers, it will compare reg with max_register in regmap_writeable.
2. In drivers/rtc/rtc-pcf85363.c, CTRL_STOP_EN is 0x2e, but DT_100THS is 0, max_regiter is 0x2f,
then reg will be equal to 0x30, '0x30 < 0x2f' is false,so regmap_writeable will return false.
>
> >
> > Signed-off-by: Biwen Li <biwen.li@nxp.com>
> > ---
> > drivers/rtc/rtc-pcf85363.c | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c
> > index a075e77617dc..3450d615974d 100644
> > --- a/drivers/rtc/rtc-pcf85363.c
> > +++ b/drivers/rtc/rtc-pcf85363.c
> > @@ -166,7 +166,12 @@ static int pcf85363_rtc_set_time(struct device
> > *dev, struct rtc_time *tm)
> > buf[DT_YEARS] = bin2bcd(tm->tm_year % 100);
> >
> > ret = regmap_bulk_write(pcf85363->regmap, CTRL_STOP_EN,
> > - tmp, sizeof(tmp));
> > + tmp, 2);
> > + if (ret)
> > + return ret;
> > +
> > + ret = regmap_bulk_write(pcf85363->regmap, DT_100THS,
> > + buf, sizeof(tmp) - 2);
> > if (ret)
> > return ret;
> >
> > --
> > 2.17.1
next prev parent reply other threads:[~2019-08-15 4:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-14 9:32 rtc: pcf85363/pcf85263: fix error that failed to run hwclock -w Biwen Li
2019-08-14 10:09 ` Alexandre Belloni
2019-08-15 4:20 ` [EXT] " Biwen Li
2019-08-14 18:39 ` Leo Li
2019-08-15 4:14 ` Biwen Li [this message]
2019-08-15 18:01 ` Leo Li
2019-08-16 2:40 ` Biwen Li
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