Commit ec011151 authored by Jarkko Nikula's avatar Jarkko Nikula Committed by Alexandre Belloni
Browse files

i3c: mipi-i3c-hci: Use own DMA bounce buffer management for I2C transfers 



Stop using I2C DMA-safe API for two reasons:
- Not needed if driver is using PIO mode.
- DMA transfers needs a DWORD align sized receive bounce buffer when the
  device DMA is IOMMU mapped, which is causing needless double bounce
  buffering in that case.

Cc: Billy Tsai <billy_tsai@aspeedtech.com>
Signed-off-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: default avatarFrank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250822105630.2820009-5-jarkko.nikula@linux.intel.com


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 9e23897b

drivers/i3c/master/mipi-i3c-hci/core.c

+1 −5
Original line number Diff line number Diff line
@@ -348,7 +348,7 @@ static int i3c_hci_i2c_xfers(struct i2c_dev_desc *dev, 
		return -ENOMEM;



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

		xfer[i].data = i2c_get_dma_safe_msg_buf(&i2c_xfers[i], 1);

		xfer[i].data = i2c_xfers[i].buf;

		xfer[i].data_len = i2c_xfers[i].len;

		xfer[i].rnw = i2c_xfers[i].flags & I2C_M_RD;

		hci->cmd->prep_i2c_xfer(hci, dev, &xfer[i]);
@@ -374,10 +374,6 @@ static int i3c_hci_i2c_xfers(struct i2c_dev_desc *dev, 
	}



out:

	for (i = 0; i < nxfers; i++)

		i2c_put_dma_safe_msg_buf(xfer[i].data, &i2c_xfers[i],

					 ret ? false : true);



	hci_free_xfer(xfer, nxfers);

	return ret;

}