There is a hard coding 60ms delay after I2C_HID_PWR_ON commadn.
Elan didn't need the delay, so we add a quirk to reduce boot time and resume time.
Fixed: eef4016243e9("HID: i2c-hid: Always sleep 60ms after I2C_HID_PWR_ON commands")
Signed-off-by: Johnny Chuang <redacted>
---
Change in v2:
- Modify Optimized tag to Fixed tag
- Modify comment for i2c_hid_quirks
---
drivers/hid/i2c-hid/i2c-hid-core.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index 9993133..f4ee690 100644
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -45,6 +45,7 @@
#define I2C_HID_QUIRK_BOGUS_IRQ BIT(4)
#define I2C_HID_QUIRK_RESET_ON_RESUME BIT(5)
#define I2C_HID_QUIRK_BAD_INPUT_SIZE BIT(6)
+#define I2C_HID_QUIRK_NO_DELAY_AFTER_PWR_ON BIT(8)
/* flags */
@@ -178,6 +179,11 @@ static const struct i2c_hid_quirks {
I2C_HID_QUIRK_RESET_ON_RESUME },
{ USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
I2C_HID_QUIRK_BAD_INPUT_SIZE },
+ /*
+ * Elan devices don't need delay after I2C_HID_PWR_ON
+ */
+ { USB_VENDOR_ID_ELAN, HID_ANY_ID,
+ I2C_HID_QUIRK_NO_DELAY_AFTER_PWR_ON },
{ 0, 0 }
};
@@ -427,7 +433,8 @@ static int i2c_hid_set_power(struct i2c_client *client, int power_state)
* PWR_ON requests. Testing has confirmed that several devices
* will not work properly without a delay after a PWR_ON request.
*/
- if (!ret && power_state == I2C_HID_PWR_ON)
+ if (!ret && power_state == I2C_HID_PWR_ON &&
+ !(ihid->quirks & I2C_HID_QUIRK_NO_DELAY_AFTER_PWR_ON))
msleep(60);
return ret;
--
2.7.4