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Commit 5da4309f authored by addy ke's avatar addy ke Committed by Wolfram Sang
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i2c: rk3x: fix bug that cause transfer fails in master receive mode 



In rk3x SOC, the I2C controller can receive/transmit up to 32 bytes data
in one chunk, so the size of data to be write/read to/from TXDATAx/RXDATAx
must be less than or equal 32 bytes at a time.

Tested on rk3288-pinky board, elan receive 158 bytes data.

Signed-off-by: default avatarAddy Ke <addy.ke@rock-chips.com>
Acked-by: default avatarMax Schwarz <max.schwarz@online.de>
Reviewed-by: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
parent 6721f28a

drivers/i2c/busses/i2c-rk3x.c

+4 −0
Original line number Diff line number Diff line
@@ -323,6 +323,10 @@ static void rk3x_i2c_handle_read(struct rk3x_i2c *i2c, unsigned int ipd) 
	/* ack interrupt */

	i2c_writel(i2c, REG_INT_MBRF, REG_IPD);



	/* Can only handle a maximum of 32 bytes at a time */

	if (len > 32)

		len = 32;



	/* read the data from receive buffer */

	for (i = 0; i < len; ++i) {

		if (i % 4 == 0)