linux-kernel - Re: [PATCH v5 3/3] mmc: host: sdhci-sprd: Implement the request

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Date:   Tue, 14 Apr 2020 16:49:17 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Baolin Wang <baolin.wang7@...il.com>, ulf.hansson@...aro.org
Cc:     arnd@...db.de, orsonzhai@...il.com, zhang.lyra@...il.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 3/3] mmc: host: sdhci-sprd: Implement the
 request_atomic() API

On 13/04/20 5:46 am, Baolin Wang wrote:
> Implement the request_atomic() API for nonremovable cards, that means
> we can submit next request in the irq hard handler context to reduce
> latency.
> 
> Moreover factor out the AUTO CMD23 checking into a separate function
> to reduce duplicate code.
> 
> Signed-off-by: Baolin Wang <baolin.wang7@...il.com>

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

> ---
>  drivers/mmc/host/sdhci-sprd.c | 23 ++++++++++++++++++++---
>  1 file changed, 20 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index 2ab42c59e4f8..bc7a8cb84862 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -406,7 +406,8 @@ static struct sdhci_ops sdhci_sprd_ops = {
>  	.request_done = sdhci_sprd_request_done,
>  };
>  
> -static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +static void sdhci_sprd_check_auto_cmd23(struct mmc_host *mmc,
> +					struct mmc_request *mrq)
>  {
>  	struct sdhci_host *host = mmc_priv(mmc);
>  	struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
> @@ -422,10 +423,23 @@ static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
>  	    mrq->sbc && (mrq->sbc->arg & SDHCI_SPRD_ARG2_STUFF) &&
>  	    (host->flags & SDHCI_AUTO_CMD23))
>  		host->flags &= ~SDHCI_AUTO_CMD23;
> +}
> +
> +static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
> +{
> +	sdhci_sprd_check_auto_cmd23(mmc, mrq);
>  
>  	sdhci_request(mmc, mrq);
>  }
>  
> +static int sdhci_sprd_request_atomic(struct mmc_host *mmc,
> +				      struct mmc_request *mrq)
> +{
> +	sdhci_sprd_check_auto_cmd23(mmc, mrq);
> +
> +	return sdhci_request_atomic(mmc, mrq);
> +}
> +
>  static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
>  {
>  	struct sdhci_host *host = mmc_priv(mmc);
> @@ -561,6 +575,11 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto pltfm_free;
>  
> +	if (!mmc_card_is_removable(host->mmc))
> +		host->mmc_host_ops.request_atomic = sdhci_sprd_request_atomic;
> +	else
> +		host->always_defer_done = true;
> +
>  	sprd_host = TO_SPRD_HOST(host);
>  	sdhci_sprd_phy_param_parse(sprd_host, pdev->dev.of_node);
>  
> @@ -654,8 +673,6 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
>  	if (ret)
>  		goto err_cleanup_host;
>  
> -	host->always_defer_done = true;
> -
>  	ret = __sdhci_add_host(host);
>  	if (ret)
>  		goto err_cleanup_host;
>