linux-kernel - Re: [PATCH v1 3/3] mmc: tegra: Enable host capability MMC_CAP2_LONG_WAIT_HW

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Date:   Tue, 17 Mar 2020 11:51:49 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        ulf.hansson@...aro.org, baolin.wang@...aro.org,
        kstewart@...uxfoundation.org, tglx@...utronix.de,
        bradleybolen@...il.com, gregkh@...uxfoundation.org,
        thierry.reding@...il.com, jonathanh@...dia.com
Cc:     anrao@...dia.com, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org
Subject: Re: [PATCH v1 3/3] mmc: tegra: Enable host capability
 MMC_CAP2_LONG_WAIT_HW_BUSY

On 10/03/20 2:13 am, Sowjanya Komatineni wrote:
> Some mmc operations take longer than maximum HW busy detection and
> mmc core driver converts R1B type to R1 type response for these
> operations based on host max busy timeout and command operation time
> and uses SW poll for busy.
> 
> Tegra host support long HW busy detection where host waits forever
> till the card is busy.
> 
> This patch enables MMC_CAP2_LONG_WAIT_HW_BUSY capability for Tegra
> host.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>

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

> ---
>  drivers/mmc/host/sdhci-tegra.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 40a221d..9d0f371 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -1583,6 +1583,7 @@ static int sdhci_tegra_probe(struct platform_device *pdev)
>  	if (tegra_host->soc_data->nvquirks & NVQUIRK_ENABLE_DDR50)
>  		host->mmc->caps |= MMC_CAP_1_8V_DDR;
>  
> +	host->mmc->caps2 |= MMC_CAP2_LONG_WAIT_HW_BUSY;
>  	tegra_sdhci_parse_dt(host);
>  
>  	tegra_host->power_gpio = devm_gpiod_get_optional(&pdev->dev, "power",
>