i2c: designware: Handle invalid SMBus block data response length value

In the I2C_FUNC_SMBUS_BLOCK_DATA case, the invalid length byte value
(outside of 1-32) of the SMBus block data response from the Slave device
is not correctly handled by the I2C Designware driver.

In case IC_EMPTYFIFO_HOLD_MASTER_EN==1, which cannot be detected
from the registers, the Master can be disabled only if the STOP bit
is set. Without STOP bit set, the Master remains active, holding the bus
until receiving a block data response length. This hangs the bus and
is unrecoverable.

Avoid this by issuing another dump read to reach the stop condition when
an invalid length byte is received.

Cc: stable@vger.kernel.org
Signed-off-by: Tam Nguyen <tamnguyenchi@os.amperecomputing.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20230726080001.337353-3-tamnguyenchi@os.amperecomputing.com
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-designware-master.c b/drivers/i2c/busses/i2c-designware-master.c
index 6fdb66fa9892af2b3e9a4e0bed211f46eb11a882..24bef0025c988b16213b2a34ce5cfe9b93a8f140 100644 (file)
--- a/drivers/i2c/busses/i2c-designware-master.c
+++ b/drivers/i2c/busses/i2c-designware-master.c
@@ -590,8 +590,19 @@ i2c_dw_read(struct dw_i2c_dev *dev)
                        regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
                        tmp &= DW_IC_DATA_CMD_DAT;
                        /* Ensure length byte is a valid value */
-                       if (flags & I2C_M_RECV_LEN &&
-                           tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
+                       if (flags & I2C_M_RECV_LEN) {
+                               /*
+                                * if IC_EMPTYFIFO_HOLD_MASTER_EN is set, which cannot be
+                                * detected from the registers, the controller can be
+                                * disabled if the STOP bit is set. But it is only set
+                                * after receiving block data response length in
+                                * I2C_FUNC_SMBUS_BLOCK_DATA case. That needs to read
+                                * another byte with STOP bit set when the block data
+                                * response length is invalid to complete the transaction.
+                                */
+                               if (!tmp || tmp > I2C_SMBUS_BLOCK_MAX)
+                                       tmp = 1;
+
                                len = i2c_dw_recv_len(dev, tmp);
                        }
                        *buf++ = tmp;