From: Lucas Stach <l.stach@pengutronix.de>
To: Peter Hutterer <peter.hutterer@who-t.net>,
Andrew Duggan <aduggan@synaptics.com>
Cc: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org,
Dmitry Torokhov <dmitry.torokhov@gmail.com>,
Paul Hollinsky <phollinsky@holtechnik.com>,
Christopher Heiny <Cheiny@synaptics.com>,
kernel@pengutronix.de, patchwork-lst@pengutronix.de
Subject: Re: [PATCH] Input: synaptics-rmi4 - Do not set reduced reporting mode thresholds are not set by the driver
Date: Thu, 12 Mar 2020 11:11:36 +0100 [thread overview]
Message-ID: <e66f788ae84b13df9ff8d28129c089431f1af9b4.camel@pengutronix.de> (raw)
In-Reply-To: <20200312031422.GA1823643@jelly>
Hi Peter,
On Do, 2020-03-12 at 13:14 +1000, Peter Hutterer wrote:
> Hi Andrew,
>
> On Wed, Mar 11, 2020 at 05:55:49PM -0700, Andrew Duggan wrote:
> > The previous patch "c5ccf2ad3d33 (Input: synaptics-rmi4 - switch to
> > reduced reporting mode)" enabled reduced reporting mode
> > unintentionally
> > on some devices, if the firmware was configured with default Delta
> > X/Y
> > threshold values. The result unintentionally degrade the
> > performance of
> > some touchpads.
>
> could this be the cause of a stuttering cursor on a P50 as well?
> A recording in the issue below shows the cursor moving by ~25 units per
> event, regardless of the time between those events.
> https://gitlab.freedesktop.org/libinput/libinput/issues/448
Yes, that's very much possible, as reduced reporting mode is about only
reporting events once they cross a predefined movement threshold.
Regards,
Lucas
> thanks!
>
> Cheers,
> Peter
>
> > This patch checks to see that the driver is modifying the delta X/Y
> > thresholds before modifying the reporting mode.
> >
> > Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
> > ---
> > drivers/input/rmi4/rmi_f11.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/input/rmi4/rmi_f11.c
> > b/drivers/input/rmi4/rmi_f11.c
> > index 6adea8a3e8fb..ffa39ab153f2 100644
> > --- a/drivers/input/rmi4/rmi_f11.c
> > +++ b/drivers/input/rmi4/rmi_f11.c
> > @@ -1203,8 +1203,8 @@ static int rmi_f11_initialize(struct
> > rmi_function *fn)
> > * If distance threshold values are set, switch to reduced
> > reporting
> > * mode so they actually get used by the controller.
> > */
> > - if (ctrl->ctrl0_11[RMI_F11_DELTA_X_THRESHOLD] ||
> > - ctrl->ctrl0_11[RMI_F11_DELTA_Y_THRESHOLD]) {
> > + if (sensor->axis_align.delta_x_threshold ||
> > + sensor->axis_align.delta_y_threshold) {
> > ctrl->ctrl0_11[0] &= ~RMI_F11_REPORT_MODE_MASK;
> > ctrl->ctrl0_11[0] |= RMI_F11_REPORT_MODE_REDUCED;
> > }
> > --
> > 2.20.1
> >
next prev parent reply other threads:[~2020-03-12 10:11 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 0:55 [PATCH] Input: synaptics-rmi4 - Do not set reduced reporting mode thresholds are not set by the driver Andrew Duggan
2020-03-12 3:14 ` Peter Hutterer
2020-03-12 10:11 ` Lucas Stach [this message]
2020-03-24 22:45 ` Dmitry Torokhov
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