diff options
| author | Jarkko Nikula <jarkko.nikula@linux.intel.com> | 2025-08-22 13:56:30 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2025-09-16 17:06:42 +0200 |
| commit | ec01115194142e39a06142447de88117365c90b3 (patch) | |
| tree | 1d7597ffbd48adad6498b67ea620d199d995b508 | |
| parent | 9e23897bca622eae20d2c038cc09b45bfaf5aed2 (diff) | |
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: 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>
| -rw-r--r-- | drivers/i3c/master/mipi-i3c-hci/core.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index b2977b6ac9f7..7a467ef65787 100644 --- a/drivers/i3c/master/mipi-i3c-hci/core.c +++ b/drivers/i3c/master/mipi-i3c-hci/core.c @@ -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; } |