linux-kernel - Re: [PATCH v5 1/2] mmc: cqhci: Add cqhci set_tran

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Message-ID: <ee017245-fec1-4492-9ce0-bb4a515d15a5@intel.com>
Date: Wed, 3 Jan 2024 20:52:58 +0200
From: Adrian Hunter <adrian.hunter@...el.com>
To: Sergey Khimich <serghox@...il.com>, linux-mmc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Ulf Hansson <ulf.hansson@...aro.org>,
 Shawn Lin <shawn.lin@...k-chips.com>, Jyan Chou <jyanchou@...ltek.com>
Subject: Re: [PATCH v5 1/2] mmc: cqhci: Add cqhci set_tran_desc() callback

On 31/12/23 16:46, Sergey Khimich wrote:
> From: Sergey Khimich <serghox@...il.com>
> 
> There are could be specific limitations for some mmc
> controllers for setting cqhci transfer descriptors.
> So add callback to allow implement driver specific function.
> 
> Signed-off-by: Sergey Khimich <serghox@...il.com>
> ---
>  drivers/mmc/host/cqhci-core.c | 10 +++++++---
>  drivers/mmc/host/cqhci.h      |  5 +++++
>  2 files changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
> index 41e94cd14109..d12870b124cc 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -474,8 +474,8 @@ 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,
> -				bool dma64)
> +void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end,

Needs to be exported also i.e.
EXPORT_SYMBOL(cqhci_set_tran_desc);

> +			 bool dma64)
>  {
>  	__le32 *attr = (__le32 __force *)desc;
>  
> @@ -522,7 +522,11 @@ static int cqhci_prep_tran_desc(struct mmc_request *mrq,
>  
>  		if ((i+1) == sg_count)
>  			end = true;
> -		cqhci_set_tran_desc(desc, addr, len, end, dma64);
> +		if (cq_host->ops->set_tran_desc)
> +			cq_host->ops->set_tran_desc(cq_host, &desc, addr, len, end, dma64);
> +		else
> +			cqhci_set_tran_desc(desc, addr, len, end, dma64);
> +
>  		desc += cq_host->trans_desc_len;
>  	}
>  
> diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h
> index 1a12e40a02e6..703d5af6c49e 100644
> --- a/drivers/mmc/host/cqhci.h
> +++ b/drivers/mmc/host/cqhci.h
> @@ -217,6 +217,7 @@ struct cqhci_host_ops;
>  struct mmc_host;
>  struct mmc_request;
>  struct cqhci_slot;
> +struct mmc_data;

Not used

>  
>  struct cqhci_host {
>  	const struct cqhci_host_ops *ops;
> @@ -293,6 +294,9 @@ struct cqhci_host_ops {
>  	int (*program_key)(struct cqhci_host *cq_host,
>  			   const union cqhci_crypto_cfg_entry *cfg, int slot);
>  #endif
> +	void (*set_tran_desc)(struct cqhci_host *cq_host, u8 **desc,
> +			      dma_addr_t addr, int len, bool end, bool dma64);
> +
>  };
>  
>  static inline void cqhci_writel(struct cqhci_host *host, u32 val, int reg)
> @@ -318,6 +322,7 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
>  int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64);
>  struct cqhci_host *cqhci_pltfm_init(struct platform_device *pdev);
>  int cqhci_deactivate(struct mmc_host *mmc);
> +void cqhci_set_tran_desc(u8 *desc, dma_addr_t addr, int len, bool end, bool dma64);
>  static inline int cqhci_suspend(struct mmc_host *mmc)
>  {
>  	return cqhci_deactivate(mmc);