diff options
| author | yangbo lu <yangbo.lu@nxp.com> | 2017-04-26 10:45:49 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-04-28 12:35:27 +0200 |
| commit | e145ac451eb68b51e0ede4c131bd5a539fb675b6 (patch) | |
| tree | 034830c2ecd85c51ce7f2609937396190ceef159 /drivers/mmc | |
| parent | a04b9b47ae587e088439495f31ca740d92191a75 (diff) | |
| download | linux-e145ac451eb68b51e0ede4c131bd5a539fb675b6.tar.bz2 | |
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')
| -rw-r--r-- | drivers/mmc/host/sdhci-of-esdhc.c | 9 |
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; |