linux-kernel - Re: [PATCH v5 01/36] i2c: tegra: Make tegra_i2c_flush

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Message-ID: <CAHp75VfGjk-91P5ENQ4=j0F99o7uVK10NxEqCS3tPEsM1o3NAQ@mail.gmail.com>
Date:   Mon, 7 Sep 2020 10:56:45 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Wolfram Sang <wsa@...-dreams.de>,
        Michał Mirosław <mirq-linux@...e.qmqm.pl>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        linux-tegra@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 01/36] i2c: tegra: Make tegra_i2c_flush_fifos() usable
 in atomic transfer

On Sun, Sep 6, 2020 at 9:51 PM Dmitry Osipenko <digetx@...il.com> wrote:
>
> The tegra_i2c_flush_fifos() shouldn't sleep in atomic transfer and jiffies
> are not updating if interrupts are disabled. Let's switch to use iopoll
> API helpers for register-polling. The iopoll API provides helpers for both
> atomic and non-atomic cases.
>
> Note that this patch doesn't fix any known problem because normally FIFO
> is flushed at the time of starting a new transfer.

...

> +       if (i2c_dev->is_curr_atomic_xfer)
> +               err = readl_relaxed_poll_timeout_atomic(addr, val, !(val & mask),
> +                                                       1000, 1000000);
> +       else
> +               err = readl_relaxed_poll_timeout(addr, val, !(val & mask),
> +                                                1000, 1000000);
> +
> +       if (err) {
> +               dev_err(i2c_dev->dev, "failed to flush FIFO\n");

> +               return err;
>         }
>         return 0;

return err; ?

-- 
With Best Regards,
Andy Shevchenko