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From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Crt Mori <cmo@melexis.com>
Cc: Jonathan Cameron <jic23@kernel.org>,
	linux-iio <linux-iio@vger.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v5 3/5] iio:temperature:mlx90632: Convert polling while loop to do-while
Date: Fri, 14 Aug 2020 15:11:01 +0300	[thread overview]
Message-ID: <CAHp75Vd+CZQCtDX8LUbQef7cQyG7brJT6S5rZeSZHTB1ZArSgQ@mail.gmail.com> (raw)
In-Reply-To: <CAKv63utpidP12iQXWU59=F+cVCq6oShSAitmKhoC4W4aaPtnRA@mail.gmail.com>

On Fri, Aug 14, 2020 at 12:42 PM Crt Mori <cmo@melexis.com> wrote:
> On Fri, 14 Aug 2020 at 11:32, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> > On Fri, Aug 14, 2020 at 10:33 AM Crt Mori <cmo@melexis.com> wrote:
> > > On Thu, 13 Aug 2020 at 21:41, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> > > > On Thu, Aug 13, 2020 at 4:04 PM Crt Mori <cmo@melexis.com> wrote:
> > > > > On Thu, 13 Aug 2020 at 13:24, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:

...

> > > > >                 usleep_range(10000, 11000);

Above for 4 attempts is up to 44000us.

With iopoll.h case we may set
 delay_us = 18000 (the result range will be 4500, 18000)
 timeout_us = 72000 (this will give up to 16 attempts to read)

> I tested on Beaglebone with the 100 * 10000 as timeout_us and I always
> got the -ETIMEDOUT error. I also tested in the other case where
> delay_us is 250000 and then timeout_us would be 4*250000 and I have
> also received -ETIMEDOUT as a response.

I don't see how delay_us should be bigger than 20ms (20000).

> I can prepare a patch with the iopoll.h API and maybe you will spot
> the mistake, as after rechecking timeout_us is indeed 64bit and is
> only used in the time comparison operations and not with timers.

Perhaps above will clarify.

-- 
With Best Regards,
Andy Shevchenko

  reply	other threads:[~2020-08-14 12:11 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-13  7:51 [PATCH v5 0/5] iio: temperature: mlx90632: Add extended calibration calculations Crt Mori
2020-08-13  7:51 ` [PATCH v5 1/5] iio:temperature:mlx90632: Reduce number of equal calulcations Crt Mori
2020-08-13  7:51 ` [PATCH v5 2/5] iio:temperature:mlx90632: Add kerneldoc to the internal struct Crt Mori
2020-08-13 10:54   ` Andy Shevchenko
2020-08-13  7:51 ` [PATCH v5 3/5] iio:temperature:mlx90632: Convert polling while loop to do-while Crt Mori
2020-08-13 11:03   ` Andy Shevchenko
2020-08-13 11:13     ` Crt Mori
2020-08-13 11:24       ` Andy Shevchenko
2020-08-13 13:03         ` Crt Mori
2020-08-13 19:40           ` Andy Shevchenko
2020-08-14  7:32             ` Crt Mori
2020-08-14  9:31               ` Andy Shevchenko
2020-08-14  9:42                 ` Crt Mori
2020-08-14 12:11                   ` Andy Shevchenko [this message]
2020-08-13  7:51 ` [PATCH v5 4/5] iio:temperature:mlx90632: Adding extended calibration option Crt Mori
2020-08-13 11:06   ` Andy Shevchenko
2020-08-13  7:51 ` [PATCH v5 5/5] iio:temperature:mlx90632: Some stylefixing leftovers Crt Mori
2020-08-13 11:01   ` Andy Shevchenko
2020-08-13 13:11     ` Crt Mori
2020-08-13 19:41       ` Andy Shevchenko
2020-08-16  8:38         ` Jonathan Cameron

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