linux-kernel - Re: [PATCH 08/15] input: touchscreen: surface3_spi: Remove set but unused variable 'timestamp'

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Message-ID: <CAN+gG=FjNfV9D9tYgMNYbCe6kgjFc0jDnreFsqOZ=2vnOv9eGA@mail.gmail.com>
Date:   Fri, 13 Nov 2020 08:42:37 +0100
From:   Benjamin Tissoires <benjamin.tissoires@...il.com>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Peter Hutterer <peter.hutterer@...-t.net>
Cc:     Lee Jones <lee.jones@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Henrik Rydberg <rydberg@...math.org>,
        linux-input <linux-input@...r.kernel.org>
Subject: Re: [PATCH 08/15] input: touchscreen: surface3_spi: Remove set but
 unused variable 'timestamp'

On Fri, Nov 13, 2020 at 8:40 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> On Thu, Nov 12, 2020 at 11:01:57AM +0000, Lee Jones wrote:
> > Fixes the following W=1 kernel build warning(s):
> >
> >  drivers/input/touchscreen/surface3_spi.c: In function ‘surface3_spi_process_touch’:
> >  drivers/input/touchscreen/surface3_spi.c:97:6: warning: variable ‘timestamp’ set but not used [-Wunused-but-set-variable]
> >
> > Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> > Cc: Henrik Rydberg <rydberg@...math.org>
> > Cc: Benjamin Tissoires <benjamin.tissoires@...il.com>
> > Cc: linux-input@...r.kernel.org
> > Signed-off-by: Lee Jones <lee.jones@...aro.org>
> > ---
> >  drivers/input/touchscreen/surface3_spi.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/drivers/input/touchscreen/surface3_spi.c b/drivers/input/touchscreen/surface3_spi.c
> > index ce4828b1415a8..72dc4c562a4e1 100644
> > --- a/drivers/input/touchscreen/surface3_spi.c
> > +++ b/drivers/input/touchscreen/surface3_spi.c
> > @@ -94,9 +94,7 @@ static void surface3_spi_report_touch(struct surface3_ts_data *ts_data,
> >
> >  static void surface3_spi_process_touch(struct surface3_ts_data *ts_data, u8 *data)
> >  {
> > -     u16 timestamp;
> >       unsigned int i;
> > -     timestamp = get_unaligned_le16(&data[15]);
>
> Benjamin, should we pass timing data on to userspace instead?

Last time I checked, libinput was not using the HW timestamp. So I
don't mind dropping it.

Not sure if chrome/android uses it.

Cheers,
Benjamin

>
> >
> >       for (i = 0; i < 13; i++) {
> >               struct surface3_ts_data_finger *finger;
> > --
> > 2.25.1
> >
>
> Thanks.
>
> --
> Dmitry