Re: [PATCH] Input: psmouse - add small delay for IBM trackpoint pass-through mode

[Dmitry Torokhov]

On Sat, Aug 15, 2015 at 04:40:18PM +0200, Stefan Assmann wrote:
> There are trackpoint devices that fail to respond to the PS2 command
> PSMOUSE_CMD_GETID if immediately queried after the parent device is
> deactivated. Add a small delay for the hardware to get in a sane state
> before sending any PS2 commands.
> 
> One example of such a system is:
> Lenovo ThinkPad X120e, model 30515QG
> synaptics: Touchpad model: 1, fw: 8.0, id: 0x1e2b1, caps: 0xd001a3/0x940300/0x121c00, board id: 1811, fw id: 797391
> 
> Signed-off-by: Stefan Assmann <sassmann@xxxxxxxxx>

Applied, thank you.

> ---
>  drivers/input/mouse/psmouse-base.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
> index ec347703..ad18dab 100644
> --- a/drivers/input/mouse/psmouse-base.c
> +++ b/drivers/input/mouse/psmouse-base.c
> @@ -1540,6 +1540,10 @@ static int psmouse_connect(struct serio *serio, struct serio_driver *drv)
>  	if (error)
>  		goto err_clear_drvdata;
>  
> +	/* give PT device some time to settle down before probing */
> +	if (serio->id.type == SERIO_PS_PSTHRU)
> +		usleep_range(10000, 15000);
> +
>  	if (psmouse_probe(psmouse) < 0) {
>  		error = -ENODEV;
>  		goto err_close_serio;
> -- 
> 2.4.3
> 

-- 
Dmitry
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