linux-kernel - Re: [PATCH] HID: logitech-hidpp: Handle timeout differently from busy

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Message-ID: <87a3b3fd-e7b0-d6b5-af80-f14557cbbc33@pobox.com>
Date:   Mon, 5 Jun 2023 10:31:39 -0400
From:   Mark Lord <mlord@...ox.com>
To:     Benjamin Tissoires <benjamin.tissoires@...hat.com>
Cc:     Jiri Kosina <jikos@...nel.org>, Bastien Nocera <hadess@...ess.net>,
        linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Peter F . Patel-Schneider" <pfpschneider@...il.com>,
        Filipe Laíns <lains@...eup.net>,
        Nestor Lopez Casado <nlopezcasad@...itech.com>
Subject: Re: [PATCH] HID: logitech-hidpp: Handle timeout differently from busy

On 2023-06-05 10:20 AM, Benjamin Tissoires wrote:
> 
> On Jun 03 2023, Mark Lord wrote:
..
>> I wonder if this code could be re-worked to not even do this (waiting)
>> from the _probe() function?  It ought to be able to throw it on a workqueue
>> or something, rather than stalling system boot for a minimum of 5-seconds
>> (or much longer as as-is).
> 
> That's an option, but the fact that I can not replicate locally with the
> exact same hardware seems to indicate that we would just be papering
> over the issue.
> 
> Here, I admittely have the USB receiver running through USB-C ports, and
> the communication never fails and I get immediate bring ups of the
> devices. Which means I am not hitting that path.
> 
> The hidpp driver should have everything ready to delay the init in a
> workqueue, but the impacted users would still get a delay when they plug
> in the device (which is better than stalling the boot, I agree).
..

Oddly, it's only a boot-time thing.
If I unplug the Logitech Unifying receiver, wait a few seconds,
and then plug it back in.. my mouse, keyboard, and touchpad all work immediately.
Unlike during boot.
-- 
Mark Lord