linux-kernel - Re: [RESEND PATCH] dmaengine: imx-sdma: support dual fifo for DEV_TO

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Date: Fri, 29 Mar 2024 00:18:39 -0400
From: Frank Li <Frank.li@....com>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: vkoul@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
	kernel@...gutronix.de, festevam@...il.com, shengjiu.wang@...il.com,
	linux-imx@....com, dmaengine@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] dmaengine: imx-sdma: support dual fifo for
 DEV_TO_DEV

On Fri, Mar 29, 2024 at 11:28:07AM +0800, Shengjiu Wang wrote:
> SSI and SPDIF are dual fifo interface, when support ASRC P2P
> with SSI and SPDIF, the src fifo or dst fifo number can be
> two.
> 
> The p2p watermark level bit 13 and 14 are designed for
> these use case. This patch is to complete this function
> in driver.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Signed-off-by: Joy Zou <joy.zou@....com>
> Acked-by: Iuliana Prodan <iuliana.prodan@....com>

This already in my sdma improvement patch list.

https://lore.kernel.org/imx/20240318-sdma_upstream-v3-0-da37ddd44d49@nxp.com/T/#m59e4e03a527103de7bf1a7fe86e8fbc570454970

This have more nice commit message. Can I take one into my patch series to
avoid conflict. 

Frank

> ---
>  drivers/dma/imx-sdma.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
> index 9b42f5e96b1e..079e6e8f4f59 100644
> --- a/drivers/dma/imx-sdma.c
> +++ b/drivers/dma/imx-sdma.c
> @@ -137,7 +137,11 @@
>   *						0: Source on AIPS
>   *	12		Destination Bit(DP)	1: Destination on SPBA
>   *						0: Destination on AIPS
> - *	13-15		---------		MUST BE 0
> + *	13		Source FIFO		1: Source is dual FIFO
> + *						0: Source is single FIFO
> + *	14		Destination FIFO	1: Destination is dual FIFO
> + *						0: Destination is single FIFO
> + *	15		---------		MUST BE 0
>   *	16-23		Higher WML		HWML
>   *	24-27		N			Total number of samples after
>   *						which Pad adding/Swallowing
> @@ -168,6 +172,8 @@
>  #define SDMA_WATERMARK_LEVEL_SPDIF	BIT(10)
>  #define SDMA_WATERMARK_LEVEL_SP		BIT(11)
>  #define SDMA_WATERMARK_LEVEL_DP		BIT(12)
> +#define SDMA_WATERMARK_LEVEL_SD		BIT(13)
> +#define SDMA_WATERMARK_LEVEL_DD		BIT(14)
>  #define SDMA_WATERMARK_LEVEL_HWML	(0xFF << 16)
>  #define SDMA_WATERMARK_LEVEL_LWE	BIT(28)
>  #define SDMA_WATERMARK_LEVEL_HWE	BIT(29)
> @@ -1255,6 +1261,16 @@ static void sdma_set_watermarklevel_for_p2p(struct sdma_channel *sdmac)
>  		sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_DP;
>  
>  	sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_CONT;
> +
> +	/*
> +	 * Limitation: The p2p script support dual fifos in maximum,
> +	 * So when fifo number is larger than 1, force enable dual
> +	 * fifos.
> +	 */
> +	if (sdmac->n_fifos_src > 1)
> +		sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_SD;
> +	if (sdmac->n_fifos_dst > 1)
> +		sdmac->watermark_level |= SDMA_WATERMARK_LEVEL_DD;
>  }
>  
>  static void sdma_set_watermarklevel_for_sais(struct sdma_channel *sdmac)
> -- 
> 2.34.1
>