From: Jarkko Nikula Date: Fri, 22 Aug 2025 10:56:30 +0000 (+0300) Subject: i3c: mipi-i3c-hci: Use own DMA bounce buffer management for I2C transfers X-Git-Tag: v6.18-rc1~153^2~17 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ec01115194142e39a06142447de88117365c90b3;p=thirdparty%2Fkernel%2Flinux.git 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 Signed-off-by: Jarkko Nikula Reviewed-by: Frank Li Link: https://lore.kernel.org/r/20250822105630.2820009-5-jarkko.nikula@linux.intel.com Signed-off-by: Alexandre Belloni --- diff --git a/drivers/i3c/master/mipi-i3c-hci/core.c b/drivers/i3c/master/mipi-i3c-hci/core.c index b2977b6ac9f7a..7a467ef657870 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; }