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mmc: sdhci: add delay after the last tuning command 

When host set the host->tuning_delay, even the last tuning
command need a delay, otherwise the first command after the
tuning will meet issue.

Take i.MX7D as an example, there will be the following log:
  mmc2: switch to high-speed from hs200 failed, err:-110
  mmc2: error -110 whilst initialising MMC card

Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
hifive-unleashed-5.1
BOUGH CHEN 2018-12-28 08:35:49 +00:00 committed by Ulf Hansson
parent d00ab1010c
commit 2b06e1597a
1 changed files with 4 additions and 3 deletions
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7
drivers/mmc/host/sdhci.c
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@ -2376,6 +2376,10 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
return -ETIMEDOUT;
}
/* Spec does not require a delay between tuning cycles */
if (host->tuning_delay > 0)
mdelay(host->tuning_delay);
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
if (ctrl & SDHCI_CTRL_TUNED_CLK)
@ -2383,9 +2387,6 @@ static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
break;
}
/* Spec does not require a delay between tuning cycles */
if (host->tuning_delay > 0)
mdelay(host->tuning_delay);
}
pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",