linux-kernel - Re: [PATCH 001/001] [Input:] Propagate hardware generated event timestamp to evdev.

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Message-ID: <CALDEARj5x+BL0_BC3cn-DBOZUNAz0-egOCjvSjM8zRWQb_bEbA@mail.gmail.com>
Date:	Tue, 16 Jul 2013 16:22:50 -0700
From:	Michael Wright <michaelwr@...roid.com>
To:	Michael Wright <michaelwr@...roid.com>
Cc:	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Alexander Levitskiy <sanek@...gle.com>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org, Rob Landley <rob@...dley.net>,
	Henrik Rydberg <rydberg@...omail.se>,
	Arve Hjønnevåg <arve@...roid.com>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH 001/001] [Input:] Propagate hardware generated event
 timestamp to evdev.

Apologies, forgot to make sure it was plain text.

On Tue, Jul 16, 2013 at 4:16 PM, Michael Wright <michaelwr@...roid.com> wrote:
> Hi Dmitry,
>
>
> On Fri, Jul 12, 2013 at 11:44 PM, Dmitry Torokhov
> <dmitry.torokhov@...il.com> wrote:
>> We already have MSC_TIMESTAMP (which is in usec), do you really need
>> nsec resolution?
>
> We don't actually need nsec resolution, usec resolution would be sufficient.
>
>
>> Why do you need this special handling? Can you simply have MSC_TIMESTAMP
>> to be delivered as part of the event packet and use it instead of the
>> event timestamp if userspace chooses to do so?
>
> We need stronger guarantees than MSC_TIMESTAMP gives us. Much of
> our system relies on the fact that timestamps produced by evdev are based on
> the systems monotonic clock, whereas MSC_TIMESTAMP provides no such
> guarantee.
> As for whether it's a MSC or SYN event, I don't think we really have
> preference.
>
> Thanks,
>
> Michael
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