[PATCH v2 2/3] dmaengine: Add support for immediate commands in the client API

Sireesh Kodali
2022-10-27T05:14:57Z

Immediate commands are needed by the IPA network driver, so that it can
send commands via BAM to the IPA microcontroller.

Signed-off-by: Sireesh Kodali <sireeshkodali1@gmail.com>
---
include/linux/dmaengine.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index c923f4e60f24..8da96bb50a63 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -190,6 +190,9 @@ struct dma_interleaved_template {
* transaction is marked with DMA_PREP_REPEAT will cause the new transaction
* to never be processed and stay in the issued queue forever. The flag is
* ignored if the previous transaction is not a repeated transaction.
+ * @DMA_PREP_IMM_CMD: tell the driver that the data passed to the DMA API is
+ * immediate command data and the descriptor should be in a different format
+ * from the normal data and descriptor
*/
enum dma_ctrl_flags {
DMA_PREP_INTERRUPT = (1 << 0),
@@ -202,6 +205,7 @@ enum dma_ctrl_flags {
DMA_PREP_CMD = (1 << 7),
DMA_PREP_REPEAT = (1 << 8),
DMA_PREP_LOAD_EOT = (1 << 9),
+ DMA_PREP_IMM_CMD = (1 << 10),
};

/**
--
2.38.1