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From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
To: Pavel Machek <pavel@denx.de>
Cc: Thierry Reding <thierry.reding@gmail.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-gpio <linux-gpio@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] gpio: max77620: Fixup debounce delays
Date: Tue, 12 Nov 2019 11:16:10 +0100
Message-ID: <CAMpxmJX0oM3cUQULr8UmKtJ5mGuzSvGeR5jCmo88Q_9+gDXqjA@mail.gmail.com> (raw)
In-Reply-To: <20191108205407.GE23750@amd>

pt., 8 lis 2019 o 21:54 Pavel Machek <pavel@denx.de> napisał(a):
>
> On Fri 2019-11-08 17:07:46, Thierry Reding wrote:
> > From: Thierry Reding <treding@nvidia.com>
> >
> > When converting milliseconds to microseconds in commit fffa6af94894
> > ("gpio: max77620: Use correct unit for debounce times") some ~1 ms gaps
> > were introduced between the various ranges supported by the controller.
> > Fix this by changing the start of each range to the value immediately
> > following the end of the previous range. This way a debounce time of,
> > say 8250 us will translate into 16 ms instead of returning an -EINVAL
> > error.
> >
> > Typically the debounce delay is only ever set through device tree and
> > specified in milliseconds, so we can never really hit this issue because
> > debounce times are always a multiple of 1000 us.
> >
> > The only notable exception for this is drivers/mmc/host/mmc-spi.c where
> > the CD GPIO is requested, which passes a 1 us debounce time. According
> > to a comment preceeding that code this should actually be 1 ms (i.e.
> > 1000 us).
> >
> > Reported-by: Pavel Machek <pavel@denx.de>
> > Signed-off-by: Thierry Reding <treding@nvidia.com>
>
> Thanks for doing this!
>
> Acked-by: Pavel Machek <pavel@denx.de>
>
> And I guess this should be cc: stable, as the commit this fixes was
> making its way there.
>
> Best regards,
>                                                                 Pavel
>
>
> > @@ -198,13 +198,13 @@ static int max77620_gpio_set_debounce(struct max77620_gpio *mgpio,
> >       case 0:
> >               val = MAX77620_CNFG_GPIO_DBNC_None;
> >               break;
> > -     case 1000 ... 8000:
> > +     case 1 ... 8000:
> >               val = MAX77620_CNFG_GPIO_DBNC_8ms;
> >               break;
> > -     case 9000 ... 16000:
> > +     case 8001 ... 16000:
> >               val = MAX77620_CNFG_GPIO_DBNC_16ms;
> >               break;
> > -     case 17000 ... 32000:
> > +     case 16001 ... 32000:
> >               val = MAX77620_CNFG_GPIO_DBNC_32ms;
> >               break;
> >       default:
>
> --
> DENX Software Engineering GmbH,      Managing Director: Wolfgang Denk
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany

Applied for fixes and marked for stable.

Thanks

      reply index

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-08 16:07 Thierry Reding
2019-11-08 16:07 ` [PATCH 2/2] gpio: bd70528: Use correct unit for debounce times Thierry Reding
2019-11-12 10:20   ` Bartosz Golaszewski
2019-11-08 20:54 ` [PATCH 1/2] gpio: max77620: Fixup debounce delays Pavel Machek
2019-11-12 10:16   ` Bartosz Golaszewski [this message]

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