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Commit e145ac45 authored by yangbo lu's avatar yangbo lu Committed by Ulf Hansson
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mmc: sdhci-of-esdhc: poll ESDHC_CLOCK_STABLE bit with udelay 



The loop to poll ESDHC_CLOCK_STABLE bit with mdelay would waste time
because the time to stabilize is much less than 1 ms. This patch is
to use udelay instead to avoid time wasting.

Signed-off-by: default avatarYangbo Lu <yangbo.lu@nxp.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent a04b9b47

drivers/mmc/host/sdhci-of-esdhc.c

+4 −5
Original line number Diff line number Diff line
@@ -445,7 +445,7 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock) 
	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);

	int pre_div = 1;

	int div = 1;

	u32 timeout;

	ktime_t timeout;

	u32 temp;



	host->mmc->actual_clock = 0;
@@ -489,15 +489,14 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock) 
	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);



	/* Wait max 20 ms */

	timeout = 20;

	timeout = ktime_add_ms(ktime_get(), 20);

	while (!(sdhci_readl(host, ESDHC_PRSSTAT) & ESDHC_CLOCK_STABLE)) {

		if (timeout == 0) {

		if (ktime_after(ktime_get(), timeout)) {

			pr_err("%s: Internal clock never stabilised.\n",

				mmc_hostname(host->mmc));

			return;

		}

		timeout--;

		mdelay(1);

		udelay(10);

	}



	temp |= ESDHC_CLOCK_SDCLKEN;