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

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Date:   Sun, 19 Sep 2021 20:13:20 +0530
From:   Sireesh Kodali <sireeshkodali1@...il.com>
To:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Sireesh Kodali <sireeshkodali1@...il.com>,
        Vinod Koul <vkoul@...nel.org>
Subject: [PATCH 2/3] dmaengine: Add support for immediate commands in the client API

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

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

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index e5c2c9e71bf1..9bac959b34a8 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),
 };
 
 /**
-- 
2.33.0