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SubjectRe: [PATCH] dmaengine: imx-sdma: support dual fifo for DEV_TO_DEV
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On 11/1/2023 9:40 AM, 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@nxp.com>
> Signed-off-by: Joy Zou <joy.zou@nxp.com>

Acked-by: Iuliana Prodan <iuliana.prodan@nxp.com>

Thanks,
Iulia

> ---
> 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 f81ecf5863e8..892e23cc0ce8 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)
> @@ -1259,6 +1265,16 @@ 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)

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