linux-kernel - Re: [PATCH] HID: hid-multitouch: forward MSC

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Date:   Thu, 5 Oct 2017 11:18:58 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Nicolas Boichat <drinkcat@...omium.org>
cc:     linux-input@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-kernel@...r.kernel.org, dtor@...omium.org
Subject: Re: [PATCH] HID: hid-multitouch: forward MSC_TIMESTAMP

On Tue, 22 Aug 2017, Nicolas Boichat wrote:

> Computes and forwards the device timestamp according to the
> specification.
> 
> Many devices use a 16-bit timestamp field, with a resolution
> of 100us, therefore rolling around very frequently (every
> 6.5 seconds). To make sure there is no ambiguity, the
> timestamp reported to the input stack reset to 0 whenever
> the time between 2 received events is greater than
> MAX_TIMESTAMP_INTERVAL (1 second).
> 
> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>
> ---
> 
> Inspired from Benjamin Tissoires's patch here:
> https://patchwork.kernel.org/patch/1742181/, and changing the
> logic to resynchronize the timestamps to use received time
> instead of a potentially more fragile difference between
> the 2 deltas.

Applied to for-4.15/multitouch.

-- 
Jiri Kosina
SUSE Labs