mmc: sdhci: add delay after the last tuning command (2b06e159) · Commits · 戴 / test

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>

drivers/mmc/host/sdhci.c

+4 −3

Original line number	Diff line number	Diff line
		@@ -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",

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