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Date:   Mon, 3 Sep 2018 11:41:47 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        "open list:HID CORE LAYER" <linux-input@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>, kai.heng.feng@...onical.com
Subject: Re: [PATCH] HID: i2c-hid: enforce I2C_HID_QUIRK_RESEND_REPORT_DESCR

On Fri, Aug 31, 2018 at 12:04 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Hi,
>
> On 31-08-18 11:54, Benjamin Tissoires wrote:
> > The spec states that the HID devices should allow
> > the host to query the HID descriptor at any time.
> >
> > Some devices require the HID descriptor to be set
> > on resume, or they will fail.
> >
> > Instead of having a growing list of blacklisted devices
> > make the call part of the general resume process
> > so we can remove this list.
> >
> > Tested on a Dell XPS 9360 and a Surface 3.
> >
> > link: https://bugzilla.redhat.com/show_bug.cgi?id=1622695
> >
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>
> I agree we should just do this everywhere:
>
> Acked-by: Hans de Goede <hdegoede@...hat.com>

Jiri, please hold with this patch, Canonical might have found a better
solution. Simply not resetting the device after S3 might be the trick.

Cheers,
Benjamin

>
> Regards,
>
> Hans
>
> > ---
> >   drivers/hid/i2c-hid/i2c-hid.c | 16 ++++------------
> >   1 file changed, 4 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> > index 57126f6837bb..17ec57c62a0b 100644
> > --- a/drivers/hid/i2c-hid/i2c-hid.c
> > +++ b/drivers/hid/i2c-hid/i2c-hid.c
> > @@ -47,7 +47,7 @@
> >   /* quirks to control the device */
> >   #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV    BIT(0)
> >   #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET    BIT(1)
> > -#define I2C_HID_QUIRK_RESEND_REPORT_DESCR    BIT(2)
> > +/* reserved: I2C_HID_QUIRK_RESEND_REPORT_DESCR       BIT(2) */
> >
> >   /* flags */
> >   #define I2C_HID_STARTED             0
> > @@ -170,12 +170,6 @@ static const struct i2c_hid_quirks {
> >               I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
> >       { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
> >               I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
> > -     { I2C_VENDOR_ID_RAYD, I2C_PRODUCT_ID_RAYD_3118,
> > -             I2C_HID_QUIRK_RESEND_REPORT_DESCR },
> > -     { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS10FB_TOUCH,
> > -             I2C_HID_QUIRK_RESEND_REPORT_DESCR },
> > -     { I2C_VENDOR_ID_RAYD, I2C_PRODUCT_ID_RAYD_4B33,
> > -             I2C_HID_QUIRK_RESEND_REPORT_DESCR },
> >       { 0, 0 }
> >   };
> >
> > @@ -1245,11 +1239,9 @@ static int i2c_hid_resume(struct device *dev)
> >        * after resume, after this it will be back normal.
> >        * otherwise it issues too many incomplete reports.
> >        */
> > -     if (ihid->quirks & I2C_HID_QUIRK_RESEND_REPORT_DESCR) {
> > -             ret = i2c_hid_command(client, &hid_report_descr_cmd, NULL, 0);
> > -             if (ret)
> > -                     return ret;
> > -     }
> > +     ret = i2c_hid_command(client, &hid_report_descr_cmd, NULL, 0);
> > +     if (ret)
> > +             return ret;
> >
> >       if (hid->driver && hid->driver->reset_resume) {
> >               ret = hid->driver->reset_resume(hid);
> >

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