Re: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS mode

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

On Tue, Jun 07, 2016 at 09:34:09PM +0800, Chris Chiu wrote:
> When performing a warm reboot from a system which does not correctly
> support ELAN I2C touchpads, the touchpad will sometimes enter standard
> mouse mode, cursor then never respond to touchpad event, and making the
> driver discard the HID reports and flood dmesg with following error
> messages.
> "elan_i2c i2c-ELAN1000:00: invalid report id data (1)"
> 
> This change is from ELAN's correction. It needs 200ms delay before
> set_mode() so that the mode setting will correctly take effect.

KT, is this feasible?

> 
> Signed-off-by: Chris Chiu <chiu@endlessm.com>
> ---
>  drivers/input/mouse/elan_i2c_core.c | 12 +++++++-----
>  1 file changed, 7 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/mouse/elan_i2c_core.c b/drivers/input/mouse/elan_i2c_core.c
> index 2f58985..95080f9 100644
> --- a/drivers/input/mouse/elan_i2c_core.c
> +++ b/drivers/input/mouse/elan_i2c_core.c
> @@ -210,18 +210,20 @@ static int __elan_initialize(struct elan_tp_data *data)
>  		return error;
>  	}
>  
> -	data->mode |= ETP_ENABLE_ABS;
> -	error = data->ops->set_mode(client, data->mode);
> +	error = data->ops->sleep_control(client, false);
>  	if (error) {
>  		dev_err(&client->dev,
> -			"failed to switch to absolute mode: %d\n", error);
> +			"failed to wake device up: %d\n", error);
>  		return error;
>  	}
>  
> -	error = data->ops->sleep_control(client, false);
> +	msleep(200);
> +
> +	data->mode |= ETP_ENABLE_ABS;
> +	error = data->ops->set_mode(client, data->mode);
>  	if (error) {
>  		dev_err(&client->dev,
> -			"failed to wake device up: %d\n", error);
> +			"failed to switch to absolute mode: %d\n", error);
>  		return error;
>  	}
>  
> -- 
> 2.1.4
> 

Thanks.

-- 
Dmitry