linux-kernel - Re: [PATCH v2 1/3] dmaengine: add DMA_PREP

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Message-ID: <20170719101122.GH3053@localhost>
Date:   Wed, 19 Jul 2017 15:41:23 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Abhishek Sahu <absahu@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        dan.j.williams@...el.com, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] dmaengine: add DMA_PREP_CMD for non-Data
 descriptors.

On Mon, Jul 17, 2017 at 02:54:21PM +0530, Abhishek Sahu wrote:
> On 2017-06-26 18:19, Abhishek Sahu wrote:
> >Some of the DMA controllers are capable of issuing the commands
> >to peripheral by the DMA. These commands can be list of register
> >reads/writes and its different from normal data reads/writes.
> >This patch adds new flag DMA_PREP_CMD in DMA API which tells
> >the driver that the data passed to DMA API is in command format
> >and DMA driver will form descriptor in the required format.
> >
> >This flag can be used by any DMA controller driver which requires
> >special handling for non-Data descriptors.
> >
> >Signed-off-by: Abhishek Sahu <absahu@...eaurora.org>
> >---
> > include/linux/dmaengine.h | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> >diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
> >index 5336808..bbc297e 100644
> >--- a/include/linux/dmaengine.h
> >+++ b/include/linux/dmaengine.h
> >@@ -186,6 +186,8 @@ struct dma_interleaved_template {
> >  *  on the result of this operation
> >  * @DMA_CTRL_REUSE: client can reuse the descriptor and submit again till
> >  *  cleared or freed
> >+ * @DMA_PREP_CMD: tell the driver that the data passed to DMA API is in
> >command
> >+ *  format and it will be used for configuring the peripheral registers.
> >  */
> > enum dma_ctrl_flags {
> > 	DMA_PREP_INTERRUPT = (1 << 0),
> >@@ -195,6 +197,7 @@ enum dma_ctrl_flags {
> > 	DMA_PREP_CONTINUE = (1 << 4),
> > 	DMA_PREP_FENCE = (1 << 5),
> > 	DMA_CTRL_REUSE = (1 << 6),
> >+	DMA_PREP_CMD = (1 << 7),
> 
> Hi Vinod/Dan,
> 
> Could you please help in reviewing these DMA patches.
> I have posted QPIC NAND support patches which are dependent
> upon these DMA patches.

Please allow reasonable time for review! This patch series was sent just
before the merge window and it closed couple of days back!!

> 
> https://www.spinics.net/lists/kernel/msg2545386.html
> 
> 
> > };
> >
> > /**
> 
> -- 
> Abhishek Sahu

-- 
~Vinod