linux-kernel - Re: [PATCH 4.1 026/159] Input: synaptics - fix handling of disabling gesture mode

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Date:	Tue, 29 Sep 2015 08:27:14 -0400
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Nick Bowler <nbowler@...conx.ca>,
	Gabor Balla <gaborwho@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Benjamin Tissoires <btissoir@...hat.com>
Subject: Re: [PATCH 4.1 026/159] Input: synaptics - fix handling of disabling
 gesture mode

On Sat, Sep 26, 2015 at 4:54 PM, Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
> 4.1-stable review patch.  If anyone has any objections, please let me know.
>
> ------------------
>
> From: Dmitry Torokhov <dmitry.torokhov@...il.com>
>
> commit e51e38494a8ecc18650efb0c840600637891de2c upstream.
>
> Bit 2 of the mode byte has dual meaning: it can disable reporting of
> gestures when touchpad works in Relative mode or normal Absolute mode,
> or it can enable so called Extended W-Mode when touchpad uses enhanced
> Absolute mode (W-mode). The extended W-Mode confuses our driver and
> causes missing button presses on some Thinkpads (x250, T450s), so let's
> make sure we do not enable it.
>
> Also, according to the spec W mode "... bit is defined only in Absolute
> mode on pads whose capExtended capability bit is set. In Relative mode and
> in TouchPads without this capability, the bit is reserved and should be
> left at 0.", so let's make sure we respect this requirement as well.
>
> Reported-by: Nick Bowler <nbowler@...conx.ca>
> Suggested-by: Gabor Balla <gaborwho@...il.com>
> Tested-by: Gabor Balla <gaborwho@...il.com>
> Tested-by: Nick Bowler <nbowler@...conx.ca>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

I believe Dmitry is going to revert this commit very shortly.  See

http://www.spinics.net/lists/linux-input/msg41176.html

You might want to leave this one out of both 4.2.y and 4.1.1y.

josh

> ---
>  drivers/input/mouse/synaptics.c |   12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
>
> --- a/drivers/input/mouse/synaptics.c
> +++ b/drivers/input/mouse/synaptics.c
> @@ -519,14 +519,18 @@ static int synaptics_set_mode(struct psm
>         struct synaptics_data *priv = psmouse->private;
>
>         priv->mode = 0;
> -       if (priv->absolute_mode)
> +
> +       if (priv->absolute_mode) {
>                 priv->mode |= SYN_BIT_ABSOLUTE_MODE;
> -       if (priv->disable_gesture)
> +               if (SYN_CAP_EXTENDED(priv->capabilities))
> +                       priv->mode |= SYN_BIT_W_MODE;
> +       }
> +
> +       if (!SYN_MODE_WMODE(priv->mode) && priv->disable_gesture)
>                 priv->mode |= SYN_BIT_DISABLE_GESTURE;
> +
>         if (psmouse->rate >= 80)
>                 priv->mode |= SYN_BIT_HIGH_RATE;
> -       if (SYN_CAP_EXTENDED(priv->capabilities))
> -               priv->mode |= SYN_BIT_W_MODE;
>
>         if (synaptics_mode_cmd(psmouse, priv->mode))
>                 return -1;
>
>
> --
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