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Message-ID: <63b4b1e7-47c8-5ba3-d216-275ad7b7f867@intel.com>
Date:   Wed, 30 Nov 2022 11:58:26 +0200
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Subject: Re: [PATCH] mmc: sdhci-sprd: Fix no reset data and command after
 voltage switch
Content-Language: en-US
To:     Wenchao Chen <wenchao.chen@unisoc.com>, ulf.hansson@linaro.org,
        orsonzhai@gmail.com, baolin.wang@linux.alibaba.com,
        zhang.lyra@gmail.com
Cc:     linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
        zhenxiong.lai@unisoc.com, yuelin.tang@unisoc.com,
        gengcixi@gmail.com
References: <20221130080224.12831-1-wenchao.chen@unisoc.com>
From:   Adrian Hunter <adrian.hunter@intel.com>
Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki,
 Business Identity Code: 0357606 - 4, Domiciled in Helsinki
In-Reply-To: <20221130080224.12831-1-wenchao.chen@unisoc.com>
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On 30/11/22 10:02, Wenchao Chen wrote:
> After switching the voltage, no reset data and command will cause
> CMD2 timeout.
> 
> Fixes: 29ca763fc26f ("mmc: sdhci-sprd: Add pin control support for voltage switch")
> Signed-off-by: Wenchao Chen <wenchao.chen@unisoc.com>

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


> ---
>  drivers/mmc/host/sdhci-sprd.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index b92a408f138d..464508be8ec8 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -470,7 +470,7 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
>  	}
>  
>  	if (IS_ERR(sprd_host->pinctrl))
> -		return 0;
> +		goto reset;
>  
>  	switch (ios->signal_voltage) {
>  	case MMC_SIGNAL_VOLTAGE_180:
> @@ -496,6 +496,7 @@ static int sdhci_sprd_voltage_switch(struct mmc_host *mmc, struct mmc_ios *ios)
>  		break;
>  	}
>  
> +reset:
>  	/* Wait for 300 ~ 500 us for pin state stable */
>  	usleep_range(300, 500);
>  	sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA);