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SubjectRe: [PATCH] Fix resume for ELAN2097 touchscreen.
On Sun, 10 Feb 2019, Jim Broadus wrote:

> Commit 52cf93e63ee6 ("HID: i2c-hid: Don't reset device upon system resume")
> fixes the resume behavior of several devices. However, this breaks the
> resume on the ELAN2097, used on Dell Inspiron laptops, with the same flood
> of messages:
>
> [27009.817110] i2c_hid i2c-ELAN2097:00: i2c_hid_get_input: incomplete report (67/65535)
> [27009.818867] i2c_hid i2c-ELAN2097:00: i2c_hid_get_input: incomplete report (67/65535)
> [27009.820623] i2c_hid i2c-ELAN2097:00: i2c_hid_get_input: incomplete report (67/65535)
>
> This change adds a new I2C_HID_QUIRK_RESET_AFTER_RESUME and replaces the
> original reset behavior for this device.
>
> Signed-off-by: Jim Broadus <jbroadus@gmail.com>

This should be fixed in hid.git#for-5.1/i2c-hid already by commit
1475af255e18f. Could you please confirm that?

> ---
> drivers/hid/hid-ids.h | 1 +
> drivers/hid/i2c-hid/i2c-hid-core.c | 20 ++++++++++++++------
> 2 files changed, 15 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 24f846d67478..38cc7033712a 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -387,6 +387,7 @@
> #define USB_DEVICE_ID_TOSHIBA_CLICK_L9W 0x0401
> #define USB_DEVICE_ID_HP_X2 0x074d
> #define USB_DEVICE_ID_HP_X2_10_COVER 0x0755
> +#define USB_DEVICE_ID_ELAN2097 0x2504
>
> #define USB_VENDOR_ID_ELECOM 0x056e
> #define USB_DEVICE_ID_ELECOM_BM084 0x0061
> diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
> index c5edfa966343..fdbad29b4406 100644
> --- a/drivers/hid/i2c-hid/i2c-hid-core.c
> +++ b/drivers/hid/i2c-hid/i2c-hid-core.c
> @@ -50,6 +50,7 @@
> #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET BIT(1)
> #define I2C_HID_QUIRK_NO_RUNTIME_PM BIT(2)
> #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP BIT(3)
> +#define I2C_HID_QUIRK_RESET_AFTER_RESUME BIT(4)
>
> /* flags */
> #define I2C_HID_STARTED 0
> @@ -181,6 +182,8 @@ static const struct i2c_hid_quirks {
> I2C_HID_QUIRK_NO_RUNTIME_PM },
> { I2C_VENDOR_ID_GOODIX, I2C_DEVICE_ID_GOODIX_01F0,
> I2C_HID_QUIRK_NO_RUNTIME_PM },
> + { USB_VENDOR_ID_ELAN, USB_DEVICE_ID_ELAN2097,
> + I2C_HID_QUIRK_RESET_AFTER_RESUME },
> { 0, 0 }
> };
>
> @@ -1279,12 +1282,17 @@ static int i2c_hid_resume(struct device *dev)
>
> enable_irq(client->irq);
>
> - /* Instead of resetting device, simply powers the device on. This
> - * solves "incomplete reports" on Raydium devices 2386:3118 and
> - * 2386:4B33 and fixes various SIS touchscreens no longer sending
> - * data after a suspend/resume.
> - */
> - ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
> + if (ihid->quirks & I2C_HID_QUIRK_RESET_AFTER_RESUME) {
> + ret = i2c_hid_hwreset(client);
> + } else {
> + /* Instead of resetting device, simply powers the device on.
> + * This solves "incomplete reports" on Raydium devices 2386:3118
> + * and 2386:4B33 and fixes various SIS touchscreens no longer
> + * sending data after a suspend/resume.
> + */
> + ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
> + }
> +
> if (ret)
> return ret;
>
> --
> 2.20.1
>

--
Jiri Kosina
SUSE Labs

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