Commit e31b556c authored by Romain Sioen's avatar Romain Sioen Committed by Jiri Kosina
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HID: mcp2221: cancel last I2C command on read error 



When an I2C SMBus read operation fails, the MCP2221 internal state machine
may not reset correctly, causing subsequent transactions to fail.

By adding a short delay and explicitly cancelling the last command,
we ensure the device is ready for the next operation.

Fix an issue where i2cdetect was not able to detect all devices correctly
on the bus.

Signed-off-by: default avatarRomain Sioen <romain.sioen@microchip.com>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.com>
parent 377f8e78

drivers/hid/hid-mcp2221.c

+2 −0
Original line number Diff line number Diff line
@@ -353,6 +353,8 @@ static int mcp_i2c_smbus_read(struct mcp2221 *mcp, 
				usleep_range(90, 100);

				retries++;

			} else {

				usleep_range(980, 1000);

				mcp_cancel_last_cmd(mcp);

				return ret;

			}

		} else {