linux-kernel - Re: [PATCH] mmc: host: sdhci-sprd: Set the missing MMC_CAP_WAIT_WHILE

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Date:   Thu, 27 Feb 2020 15:19:10 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Baolin Wang <baolin.wang7@...il.com>, ulf.hansson@...aro.org
Cc:     orsonzhai@...il.com, zhang.lyra@...il.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: host: sdhci-sprd: Set the missing
 MMC_CAP_WAIT_WHILE_BUSY flag

On 24/02/20 11:08 am, Baolin Wang wrote:
> The Spreadtrum host controller supports HW busy detection for I/O
> operations, which means when the host gets a transfer complete event,
> that always indicates the busy signal is released. Thus we can set
> the MMC_CAP_WAIT_WHILE_BUSY flag to remove some redundant software
> busy polling.
> 
> Signed-off-by: Baolin Wang <baolin.wang7@...il.com>

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

> ---
>  drivers/mmc/host/sdhci-sprd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index d346223..2ab42c5 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -556,7 +556,7 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
>  		sdhci_sprd_voltage_switch;
>  
>  	host->mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED |
> -		MMC_CAP_ERASE | MMC_CAP_CMD23;
> +		MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY;
>  	ret = mmc_of_parse(host->mmc);
>  	if (ret)
>  		goto pltfm_free;
>