linux-kernel - Re: [PATCH v2] mmc: host: sdhci-sprd: Fix the incorrect soft reset operation when runtime resuming

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Message-ID: <987d226b-5906-f403-d641-3c54430f1c9b@intel.com>
Date:   Tue, 16 Jul 2019 11:22:52 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Baolin Wang <baolin.wang@...aro.org>, ulf.hansson@...aro.org,
        zhang.lyra@...il.com, orsonzhai@...il.com
Cc:     vincent.guittot@...aro.org, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mmc: host: sdhci-sprd: Fix the incorrect soft reset
 operation when runtime resuming

On 16/07/19 10:31 AM, Baolin Wang wrote:
> In sdhci_runtime_resume_host() function, we will always do software reset
> for all, which will cause Spreadtrum host controller work abnormally after
> resuming.
> 
> Thus for Spreadtrum platform that do not power down the SD/eMMC card during
> runtime suspend, we should not do software reset for all. To fix this
> issue, adding a specific reset operation that add one condition to validate
> the MMC_CAP_AGGRESSIVE_PM to decide if we can do software reset for all or
> just reset command and data lines.
> 
> Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
> ---
> Changes from v1:
>  - Add a specific reset operation instead of changing the core to avoid
>  affecting other hardware.
> ---
>  drivers/mmc/host/sdhci-sprd.c |   38 +++++++++++++++++++++++++++++++++++++-
>  1 file changed, 37 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index 603a5d9..174b566 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -373,6 +373,42 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
>  	return 1 << 31;
>  }
>  
> +static void sdhci_sprd_reset(struct sdhci_host *host, u8 mask)
> +{
> +	struct mmc_host *mmc = host->mmc;
> +	ktime_t timeout;
> +
> +	/*
> +	 * When try to reset controller after runtime suspend, we should not
> +	 * reset for all if the SD/eMMC card is not power down, just reset
> +	 * command and data lines instead. Otherwise will meet some strange
> +	 * behaviors for Spreadtrum host controller.
> +	 */
> +	if (host->runtime_suspended && (mask & SDHCI_RESET_ALL) &&
> +	    !(mmc->caps & MMC_CAP_AGGRESSIVE_PM))
> +		mask = SDHCI_RESET_CMD | SDHCI_RESET_DATA;
> +

Here you could just call sdhci_reset(host, mask) instead of below.

> +	sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
> +
> +	/* Wait max 100 ms */
> +	timeout = ktime_add_ms(ktime_get(), 100);
> +
> +	/* hw clears the bit when it's done */
> +	while (1) {
> +		bool timedout = ktime_after(ktime_get(), timeout);
> +
> +		if (!(sdhci_readb(host, SDHCI_SOFTWARE_RESET) & mask))
> +			break;
> +		if (timedout) {
> +			pr_err("%s: Reset 0x%x never completed.\n",
> +				mmc_hostname(host->mmc), (int)mask);
> +			sdhci_dumpregs(host);
> +			return;
> +		}
> +		udelay(10);
> +	}
> +}
> +
>  static struct sdhci_ops sdhci_sprd_ops = {
>  	.read_l = sdhci_sprd_readl,
>  	.write_l = sdhci_sprd_writel,
> @@ -381,7 +417,7 @@ static unsigned int sdhci_sprd_get_max_timeout_count(struct sdhci_host *host)
>  	.get_max_clock = sdhci_sprd_get_max_clock,
>  	.get_min_clock = sdhci_sprd_get_min_clock,
>  	.set_bus_width = sdhci_set_bus_width,
> -	.reset = sdhci_reset,
> +	.reset = sdhci_sprd_reset,
>  	.set_uhs_signaling = sdhci_sprd_set_uhs_signaling,
>  	.hw_reset = sdhci_sprd_hw_reset,
>  	.get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
>