linux-kernel - RE: [PATCH V2] HID: HID-rmi - ignore to rmi_hid_read

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Date:   Thu, 11 Aug 2022 03:04:31 +0000
From:   Marge Yang <Marge.Yang@...synaptics.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        margeyang <marge.yang@...aptics.corp-partner.google.com>,
        "dmitry.torokhov@...il.com" <dmitry.torokhov@...il.com>,
        "linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "benjamin.tissoires@...hat.com" <benjamin.tissoires@...hat.com>
CC:     Derek Cheng <derek.cheng@...synaptics.com>,
        Vincent Huang <Vincent.huang@...synaptics.com>,
        David Chiu <David.Chiu@...synaptics.com>
Subject: RE: [PATCH V2] HID: HID-rmi - ignore to rmi_hid_read_block after
 system resumes.

Hi Hans,
	Thanks for your suggestion.
	
	if (xport->ignoreonce == 1) {

I have modified/verified it and sent 3rd version.

Thanks
Marge Yang

-----Original Message-----
From: Hans de Goede <hdegoede@...hat.com> 
Sent: Wednesday, August 10, 2022 6:12 PM
To: margeyang <marge.yang@...aptics.corp-partner.google.com>; dmitry.torokhov@...il.com; linux-input@...r.kernel.org; linux-kernel@...r.kernel.org; benjamin.tissoires@...hat.com
Cc: Marge Yang <Marge.Yang@...synaptics.com>; Derek Cheng <derek.cheng@...synaptics.com>; Vincent Huang <Vincent.huang@...synaptics.com>
Subject: Re: [PATCH V2] HID: HID-rmi - ignore to rmi_hid_read_block after system resumes.

CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.


Hi,

On 8/9/22 05:09, margeyang wrote:
> From: Marge Yang <marge.yang@...aptics.corp-partner.google.com>
>
> The interrupt GPIO will be pulled down once after RMI driver reads 
> this command(Report ID:0x0A).
> It will cause "Dark resume test fail" for chromebook device.
> Hence, TP driver will ignore rmi_hid_read_block function once after 
> system resumes.
>
> Signed-off-by: Marge 
> Yang<marge.yang@...aptics.corp-partner.google.com>
> ---
>  drivers/hid/hid-rmi.c | 14 ++++++++++++--
>  include/linux/rmi.h   |  2 ++
>  2 files changed, 14 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c index 
> 311eee599ce9..b08b74b0c140 100644
> --- a/drivers/hid/hid-rmi.c
> +++ b/drivers/hid/hid-rmi.c
> @@ -203,7 +203,13 @@ static int rmi_hid_read_block(struct rmi_transport_dev *xport, u16 addr,
>               if (ret < 0)
>                       goto exit;
>       }
> -
> +     if ((!!xport) && (xport->ignoreonce == 1)) {

The top of this function has:

       struct rmi_data *data = container_of(xport, struct rmi_data, xport);

and data gets dereferenced unconditionally in various places, so there is no need for the xport check, please change this to just:

        if (xport->ignoreonce == 1) {

Otherwise this looks good to me now.

Regards,

Hans


> +             dev_err(&hdev->dev,
> +                     "ignoreonce (%d)\n",
> +                     xport->ignoreonce);
> +             xport->ignoreonce = 0;
> +             goto exit;
> +     }
>       for (retries = 5; retries > 0; retries--) {
>               data->writeReport[0] = RMI_READ_ADDR_REPORT_ID;
>               data->writeReport[1] = 0; /* old 1 byte read count */ @@ 
> -468,8 +474,12 @@ static int rmi_post_resume(struct hid_device *hdev)
>       ret = hid_hw_open(hdev);
>       if (ret)
>               return ret;
> -
> +     // Avoid to read rmi_hid_read_block once after system resumes.
> +     // The interrupt will be pulled down
> +     // after RMI Read command(Report ID:0x0A).
> +     data->xport.ignoreonce = 1;
>       ret = rmi_reset_attn_mode(hdev);
> +     data->xport.ignoreonce = 0;
>       if (ret)
>               goto out;
>
> diff --git a/include/linux/rmi.h b/include/linux/rmi.h index 
> ab7eea01ab42..24f63ad00970 100644
> --- a/include/linux/rmi.h
> +++ b/include/linux/rmi.h
> @@ -270,6 +270,8 @@ struct rmi_transport_dev {
>       struct rmi_device_platform_data pdata;
>
>       struct input_dev *input;
> +
> +     int ignoreonce;
>  };
>
>  /**