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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: Liguang Zhang <zhangliguang@linux.alibaba.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Wolfram Sang <wsa@kernel.org>
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2 changed files with 3 additions and 1 deletions
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@ -38,6 +38,8 @@
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#define DW_IC_CON_TX_EMPTY_CTRL BIT(8)
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#define DW_IC_CON_RX_FIFO_FULL_HLD_CTRL BIT(9)
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#define DW_IC_DATA_CMD_DAT GENMASK(7, 0)
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/*
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* Registers offset
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*/
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@ -432,7 +432,7 @@ i2c_dw_read(struct dw_i2c_dev *dev)
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regmap_read(dev->map, DW_IC_DATA_CMD, &tmp);
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/* Ensure length byte is a valid value */
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if (flags & I2C_M_RECV_LEN &&
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tmp <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
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(tmp & DW_IC_DATA_CMD_DAT) <= I2C_SMBUS_BLOCK_MAX && tmp > 0) {
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len = i2c_dw_recv_len(dev, tmp);
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}
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*buf++ = tmp;
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