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

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Date:	Tue, 21 Jun 2016 20:40:20 +0800
From:	廖崇榮 <kt.liao@....com.tw>
To:	"'Dmitry Torokhov'" <dmitry.torokhov@...il.com>,
	"'Chris Chiu'" <chiu@...lessm.com>
Cc:	"'Charlie Mooney'" <charliemooney@...omium.org>,
	"'Michele Curti'" <michele.curti@...il.com>,
	"'Krzysztof Kozlowski'" <k.kozlowski@...sung.com>,
	"'Benson Leung'" <bleung@...omium.org>,
	<linux-input@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux@...lessm.com>,
	黃世鵬 經理 <phoenix@....com.tw>
Subject: RE: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS mode

Hi Dmitry,

-----Original Message-----
From: Dmitry Torokhov [mailto:dmitry.torokhov@...il.com] 
Sent: Tuesday, June 21, 2016 1:43 AM
To: Chris Chiu; kt.liao@....com.tw
Cc: Charlie Mooney; Michele Curti; Krzysztof Kozlowski; Benson Leung;
linux-input@...r.kernel.org; linux-kernel@...r.kernel.org;
linux@...lessm.com
Subject: Re: [PATCH] Input: elan_i2c - +200 ms delay before setting to ABS
mode

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?
[KT] After internal discussion, we don't agree this patch. 
    It's a work-around to fix firmware bug for specific touchpad and not
tested by other device.
    
> 
> Signed-off-by: Chris Chiu <chiu@...lessm.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