Commit f53f15ba authored by Liguang Zhang's avatar Liguang Zhang Committed by Wolfram Sang
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i2c: designware: Get right data length



IC_DATA_CMD[11] indicates the first data byte received after the address
phase for receive transfer in Master receiver or Slave receiver mode,
this bit was set in some transfer flow. IC_DATA_CMD[7:0] contains the
data to be transmitted or received on the I2C bus, so we should use the
lower 8 bits to get the real data length.

Signed-off-by: default avatarLiguang Zhang <zhangliguang@linux.alibaba.com>
Reviewed-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarWolfram Sang <wsa@kernel.org>
parent a1858ce0
......@@ -38,6 +38,8 @@
#define DW_IC_CON_TX_EMPTY_CTRL BIT(8)
#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL BIT(9)
#define DW_IC_DATA_CMD_DAT GENMASK(7, 0)
/*
* Registers offset
*/
......
......@@ -432,7 +432,7 @@ i2c_dw_read(struct dw_i2c_dev *dev)
regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
/* Ensure length byte is a valid value */
if (flags & I2C_M_RECV_LEN &&
tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
(tmp & DW_IC_DATA_CMD_DAT) <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
len = i2c_dw_recv_len(dev, tmp);
}
*buf++ = tmp;
......
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