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

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Date:   Mon, 16 Nov 2020 08:02:05 +1000
From:   Peter Hutterer <peter.hutterer@...-t.net>
To:     Benjamin Tissoires <benjamin.tissoires@...il.com>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        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 08:42:37AM +0100, Benjamin Tissoires wrote:
> 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.

I'm assuming this would be passed on as MSC_TIMESTAMP?

I never found the time implementing this and I mask MSC_TIMESTAMP on most
devices anyway (except for Dell's i2c touchpads where I need it to work
around a fw bug). so at least from libinput's POV it wouldn't have any
effect either way.

Cheers,
   Peter

> 
> 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