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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc7edge2.nvidia.com; CAT:NONE; SFS:(13230040)(36860700013)(1800799024)(7416014)(82310400026)(376014)(921020); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 May 2025 05:26:51.4827 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 70010a11-b2b2-4317-6ef0-08dd9c15eb7a X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.118.233]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000026C8.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR12MB5683 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 Signed-off-by: Akhil R --- drivers/i2c/busses/i2c-tegra.c | 20 +------------------- 1 file changed, 1 insertion(+), 19 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 22ddbae9d847..b10a4bc9cb34 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -1292,17 +1292,9 @@ 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); } } @@ -1312,11 +1304,6 @@ 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; @@ -1357,13 +1344,8 @@ 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,