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

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>

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 3917fc4cf96ab2ac9edde806527149c0f19bbbea..2114ac647bef8f8150259713525f0d6d0d94fe94 100644 (file)
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -710,6 +710,7 @@
 #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-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 3cde7c1b9c33cd673858d5089ed097e724fb12b0..8555ce7e737b37a78160d930a9ba12ed311e001b 100644 (file)
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -177,6 +177,8 @@ static const struct i2c_hid_quirks {
                I2C_HID_QUIRK_NO_RUNTIME_PM },
        { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33,
                I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
+       { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
+               I2C_HID_QUIRK_NO_RUNTIME_PM },
        { 0, 0 }
 };