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authoryangbo lu <yangbo.lu@nxp.com>2017-04-26 10:45:49 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2017-04-28 12:35:27 +0200
commite145ac451eb68b51e0ede4c131bd5a539fb675b6 (patch)
tree034830c2ecd85c51ce7f2609937396190ceef159 /drivers/mmc/host
parenta04b9b47ae587e088439495f31ca740d92191a75 (diff)
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: Yangbo Lu <yangbo.lu@nxp.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host')
-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index 7518360c03d2..77dfc5915ddc 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -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;