linux-kernel - Re: [PATCH v4 1/3] mmc: sdhci: add adma_table_cnt member to struct sdhci

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Message-ID: <082e4ee7-3b6a-f4a0-0db9-bfa63e05ec16@intel.com>
Date:   Thu, 23 Aug 2018 14:27:16 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Jisheng Zhang <Jisheng.Zhang@...aptics.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] mmc: sdhci: add adma_table_cnt member to struct
 sdhci_host

On 23/08/18 13:07, Jisheng Zhang wrote:
> This patch adds adma_table_cnt member to struct sdhci_host to give more
> flexibility to drivers to control the ADMA table count.
> 
> Default value of adma_table_cnt is set to (SDHCI_MAX_SEGS * 2 + 1).
> 
> Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci.c | 17 +++++++++--------
>  drivers/mmc/host/sdhci.h |  3 +++
>  2 files changed, 12 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 1b3fbd9bd5c5..52ccf4644384 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -3322,6 +3322,13 @@ struct sdhci_host *sdhci_alloc_host(struct device *dev,
>  
>  	host->sdma_boundary = SDHCI_DEFAULT_BOUNDARY_ARG;
>  
> +	/*
> +	 * The DMA table descriptor count is calculated as the maximum
> +	 * number of segments times 2, to allow for an alignment
> +	 * descriptor for each segment, plus 1 for a nop end descriptor.
> +	 */
> +	host->adma_table_cnt = SDHCI_MAX_SEGS * 2 + 1;
> +
>  	return host;
>  }
>  
> @@ -3567,18 +3574,12 @@ int sdhci_setup_host(struct sdhci_host *host)
>  		dma_addr_t dma;
>  		void *buf;
>  
> -		/*
> -		 * The DMA descriptor table size is calculated as the maximum
> -		 * number of segments times 2, to allow for an alignment
> -		 * descriptor for each segment, plus 1 for a nop end descriptor,
> -		 * all multipled by the descriptor size.
> -		 */
>  		if (host->flags & SDHCI_USE_64_BIT_DMA) {
> -			host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
> +			host->adma_table_sz = host->adma_table_cnt *
>  					      SDHCI_ADMA2_64_DESC_SZ;
>  			host->desc_sz = SDHCI_ADMA2_64_DESC_SZ;
>  		} else {
> -			host->adma_table_sz = (SDHCI_MAX_SEGS * 2 + 1) *
> +			host->adma_table_sz = host->adma_table_cnt *
>  					      SDHCI_ADMA2_32_DESC_SZ;
>  			host->desc_sz = SDHCI_ADMA2_32_DESC_SZ;
>  		}
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index f0bd36ce3817..25bddd21de31 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -563,6 +563,9 @@ struct sdhci_host {
>  	/* Host SDMA buffer boundary. */
>  	u32			sdma_boundary;
>  
> +	/* Host ADMA table count */
> +	u32			adma_table_cnt;
> +
>  	u64			data_timeout;
>  
>  	unsigned long private[0] ____cacheline_aligned;
>