linux-kernel - Re: [PATCH v2] Input: applespi - register touchpad device synchronously in probe

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Message-ID: <20190729132203.GB1201@penguin>
Date:   Mon, 29 Jul 2019 15:22:03 +0200
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Ronald Tschalär <ronald@...ovation.ch>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Mao Wenan <maowenan@...wei.com>,
        Federico Lorenzi <federico@...velground.com>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Input: applespi - register touchpad device
 synchronously in probe

Hi Ronald,

On Sun, Jul 21, 2019 at 12:05:23AM -0700, Ronald Tschalär wrote:
> This allows errors during registration to properly fail the probe
> function.
> 
> Doing this requires waiting for a response from the device inside the
> probe function. While this generally takes about 15ms, in case of errors
> it could be arbitrarily long, and hence a 3 second timeout is used.
> 
> This also adds 3 second timeouts to the drain functions to avoid the
> potential for suspend or remove hanging forever.

Question: is it possible to read command response synchronously as well?
I.e. I was wondering if we could add 2 (or 1?) more read xfers for the
actual result that is coming after the status response, and then we
could use spi_sync() to send the command and read the whole thing.

Thanks.

-- 
Dmitry