HID: Intel-thc-hid: Intel-thc: Fix wrong register fields updating

Clear the target bit fields in register before setting new values. This
ensures proper field updates by removing any existing bits that might
interfere with the new configuration.

Fixes: 22da60f ("HID: Intel-thc-hid: Intel-thc: Introduce interrupt delay control")
Fixes: 45e92a0 ("HID: Intel-thc-hid: Intel-thc: Introduce max input size control")
Signed-off-by: Even Xu <even.xu@intel.com>
Tested-by: Rui Zhang <rui1.zhang@intel.com>
Signed-off-by: Jiri Kosina <jkosina@suse.com>

Author: Evenxf

drivers/hid/intel-thc-hid/intel-thc/intel-thc-dev.c

@@ -1597,6 +1597,7 @@ int thc_i2c_set_rx_max_size(struct thc_device *dev, u32 max_rx_size)
 	if (ret)
 		return ret;
 
+	val = val & ~THC_M_PRT_SPI_ICRRD_OPCODE_I2C_MAX_SIZE;
 	val |= FIELD_PREP(THC_M_PRT_SPI_ICRRD_OPCODE_I2C_MAX_SIZE, max_rx_size);
 
 	ret = regmap_write(dev->thc_regmap, THC_M_PRT_SPI_ICRRD_OPCODE_OFFSET, val);
@@ -1667,6 +1668,7 @@ int thc_i2c_set_rx_int_delay(struct thc_device *dev, u32 delay_us)
 		return ret;
 
 	/* THC hardware counts at 10us unit */
+	val = val & ~THC_M_PRT_SPI_ICRRD_OPCODE_I2C_INTERVAL;
 	val |= FIELD_PREP(THC_M_PRT_SPI_ICRRD_OPCODE_I2C_INTERVAL, DIV_ROUND_UP(delay_us, 10));
 
 	ret = regmap_write(dev->thc_regmap, THC_M_PRT_SPI_ICRRD_OPCODE_OFFSET, val);