On Po 5. Jún 2017 22:27 Daniel Drake wrote:
> New Acer laptops (Aspire A315-31 and several others) have an EC which
> expects the PS/2 reset command to happen during boot.
>
> On Linux, that means that currently the touchpad is unresponsive until
> suspend/resume, when psmouse_reconnect() resets the device.
>
> We observe that Windows sends a PS/2 reset command during boot.
> Make Linux do the same here, making the touchpad usable on these
> new products.
>
> Signed-off-by: Daniel Drake <drake@xxxxxxxxxxxx>
> ---
> drivers/input/mouse/psmouse-base.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/input/mouse/psmouse-base.c
> b/drivers/input/mouse/psmouse-base.c index f73b47b8c578..8f3c903db7b9
> 100644 --- a/drivers/input/mouse/psmouse-base.c
> +++ b/drivers/input/mouse/psmouse-base.c
> @@ -1591,6 +1591,12 @@ static int psmouse_connect(struct serio *serio,
> struct serio_driver *drv)
> psmouse->resync_time = parent ? 0 : psmouse_resync_time;
> psmouse->smartscroll = psmouse_smartscroll;
>
> + /* Reset the device, even though we would ordinarily expect it to
> + * already be in the reset state. This matches Windows behaviour,
> + * which some ECs require.
> + */
> + psmouse_reset(psmouse);
> +
> psmouse_switch_protocol(psmouse, NULL);
>
> if (!psmouse->protocol->smbus_companion) {
This patch will slow down enumeration and initalization of *all* PS/2 mouses.
I guess if there are some problematic machines, it could be hooked...
--
Pali Rohár
pali.rohar@xxxxxxxxx
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