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

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Message-ID: <b1d83d7295b453bccf92bb12908dfddd@codeaurora.org>
Date:   Mon, 17 Jul 2017 14:54:21 +0530
From:   Abhishek Sahu <absahu@...eaurora.org>
To:     andy.gross@...aro.org, david.brown@...aro.org,
        vinod.koul@...el.com, dan.j.williams@...el.com
Cc:     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 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.

https://www.spinics.net/lists/kernel/msg2545386.html


>  };
> 
>  /**

-- 
Abhishek Sahu