HID: i2c-hid: Disable runtime PM for LG touchscreen

BugLink: https://bugs.launchpad.net/bugs/1805085
LG touchscreen (1fd2:8001) stops working after reboot:
[ 4.859153] i2c_hid i2c-SAPS2101:00: i2c_hid_get_input: incomplete report (64/66)
[ 4.936070] i2c_hid i2c-SAPS2101:00: i2c_hid_get_input: incomplete report (64/66)
[ 9.948224] i2c_hid i2c-SAPS2101:00: failed to reset device.

The device in question stops working after receives SLEEP, ON, SLEEP
commands in a short period. The scenario is like this:
- Once the desktop session closes, it also closed the hid device, so the
device gets runtime suspended and receives a SLEEP command.
- Before calling shutdown callback, it gets runtime resumed and received
an ON command.
- In the shutdown callback, it receives another SLEEP command.

I failed to find a reliable interval between ON/SLEEP commands that can
make it work, so let's simply disable runtime PM for the device.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
(backported from commit 86c31524b27c7e686841dd4a79eda95cfd989f16)
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 7e3d8b7626171fe8825ac6883f1c46350627106f..3171db744c1c06545acf4e40dd6bf7705f89c659 100644 (file)
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -690,6 +690,7 @@
 #define USB_VENDOR_ID_LG               0x1fd2
 #define USB_DEVICE_ID_LG_MULTITOUCH    0x0064
 #define USB_DEVICE_ID_LG_MELFAS_MT     0x6007
+#define I2C_DEVICE_ID_LG_8001          0x8001
 
 #define USB_VENDOR_ID_LOGITECH         0x046d
 #define USB_DEVICE_ID_LOGITECH_AUDIOHUB 0x0a0e

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 4c8734f404c81b068dcfc8d053cbdefbf4fabaf8..103916c6026cb057c811f179db063a276ac3d6f2 100644 (file)
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -176,6 +176,8 @@ static const struct i2c_hid_quirks {
                I2C_HID_QUIRK_NO_RUNTIME_PM },
        { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS10FB_TOUCH,
                I2C_HID_QUIRK_RESEND_REPORT_DESCR },
+       { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
+               I2C_HID_QUIRK_NO_RUNTIME_PM },
        { 0, 0 }
 };