[ Upstream commit efdc383d1c ]
The LPI2C controller sends a NACK at the end of a receive command
unless another receive command is already queued in MTDR. During
SMBus block reads, this causes the controller to NACK immediately
after receiving the block length byte, aborting the transfer before
the data bytes are read.
Fix this by queueing a second receive command as soon as the block
length byte is received, keeping MTDR non-empty and ensuring
continuous ACKs. The initial receive command reads the block length,
and the subsequent command reads the remaining data bytes according
to the reported length.
Fixes: a55fa9d0e4 ("i2c: imx-lpi2c: add low power i2c bus driver")
Signed-off-by: Carlos Song <carlos.song@nxp.com>
Cc: <stable@vger.kernel.org> # v4.10+
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260123105459.3448822-1-carlos.song@nxp.com
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
80a2e762b2