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

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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: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20250822105630.2820009-5-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Jarkko Nikula 2025-08-22 13:56:30 +03:00 committed by Alexandre Belloni
parent 9e23897bca
commit ec01115194
1 changed files with 1 additions and 5 deletions
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6
drivers/i3c/master/mipi-i3c-hci/core.c
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@ -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;
}