diff options
| author | Akhil R <akhilrajeev@nvidia.com> | 2025-07-10 18:42:06 +0530 |
|---|---|---|
| committer | Andi Shyti <andi.shyti@kernel.org> | 2025-07-30 00:30:54 +0200 |
| commit | 315b40df66c8f1d7be8056d9d418bb6976747389 (patch) | |
| tree | bc9ba5add86f161215d5cbd87149027280d6d23d | |
| parent | 635bf3c8853359a987c5c909d424df92a0d3016a (diff) | |
i2c: tegra: Remove dma_sync_*() calls
Calling dma_sync_*() on a buffer from dma_alloc_coherent() is pointless.
The driver should not be doing its own bounce-buffering if the buffer is
allocated through dma_alloc_coherent().
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20250710131206.2316-4-akhilrajeev@nvidia.com
| -rw-r--r-- | drivers/i2c/busses/i2c-tegra.c | 20 |
1 files changed, 1 insertions, 19 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 6088510b25f6..4eb31b913c1a 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -1301,17 +1301,9 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (i2c_dev->dma_mode) { if (i2c_dev->msg_read) { - dma_sync_single_for_device(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_FROM_DEVICE); - err = tegra_i2c_dma_submit(i2c_dev, xfer_size); if (err) return err; - } else { - dma_sync_single_for_cpu(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_TO_DEVICE); } } @@ -1321,11 +1313,6 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (i2c_dev->dma_mode) { memcpy(i2c_dev->dma_buf + I2C_PACKET_HEADER_SIZE, msg->buf, i2c_dev->msg_len); - - dma_sync_single_for_device(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_TO_DEVICE); - err = tegra_i2c_dma_submit(i2c_dev, xfer_size); if (err) return err; @@ -1366,13 +1353,8 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, return -ETIMEDOUT; } - if (i2c_dev->msg_read && i2c_dev->msg_err == I2C_ERR_NONE) { - dma_sync_single_for_cpu(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_FROM_DEVICE); - + if (i2c_dev->msg_read && i2c_dev->msg_err == I2C_ERR_NONE) memcpy(i2c_dev->msg_buf, i2c_dev->dma_buf, i2c_dev->msg_len); - } } time_left = tegra_i2c_wait_completion(i2c_dev, &i2c_dev->msg_complete, |