linux-kernel - Re: [PATCH V4][1/4] mmc: solve DMA boundary limitation of CQHCI driver

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Date:   Mon, 30 Oct 2023 08:35:12 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Jyan Chou <jyanchou@...ltek.com>, ulf.hansson@...aro.org,
        adrian.hunter@...el.com, jh80.chung@...sung.com,
        riteshh@...eaurora.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        asutoshd@...eaurora.org, p.zabel@...gutronix.de
Cc:     linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        briannorris@...omium.org, doug@...morgal.com,
        tonyhuang.sunplus@...il.com, abel.vesa@...aro.org,
        william.qiu@...rfivetech.com
Subject: Re: [PATCH V4][1/4] mmc: solve DMA boundary limitation of CQHCI
 driver

On 30/10/2023 07:27, Jyan Chou wrote:
> Due to synopsys data book's description, it had a limitation
> while using DMA that buffer size and start address must not
> exceed 128 MB.
> 
> We add an option setup_tran_desc to make tran_desc setting flexible.
> 
> Signed-off-by: Jyan Chou <jyanchou@...ltek.com>
> 
> ---
> v2 -> v3:
> - Fix auto test compile warning.
> 
> v1 -> v2:
> - Export cqhci_set_tran_desc for setting the descriptor's callback function.
> 
> v0 -> v1:
> - Separate different patch supports into single patch.
> ---
> ---
>  drivers/mmc/host/cqhci-core.c | 8 +++++++-
>  drivers/mmc/host/cqhci.h      | 5 +++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
> index b3d7d6d8d654..5560329d2a7d 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -474,7 +474,7 @@ static int cqhci_dma_map(struct mmc_host *host, struct mmc_request *mrq)
>  	return sg_count;
>  }
>  
> -static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
> +void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
>  				bool dma64)
>  {
>  	__le32 *attr = (__le32 __force *)desc;
> @@ -495,6 +495,7 @@ static void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,
>  		dataddr[0] = cpu_to_le32(addr);
>  	}
>  }
> +EXPORT_SYMBOL(cqhci_set_tran_desc);

EXPORT_SYMBOL_GPL


Best regards,
Krzysztof