mmc: sdhci: add quirk for keeping card power during suspend (6308d290) · Commits · 戴 / test

Add quirk SDHCI_QUIRK2_HOST_OFF_CARD_ON to cater for the case when the card keeps power during suspend but the host controller does not i.e. the card power is not controlled by the host controller. In that case, the controller must be fully reset on resume. Signed-off-by:

Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:

Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci.c

+11 −2

Original line number	Diff line number	Diff line
		@@ -2426,8 +2426,17 @@ int sdhci_resume_host(struct sdhci_host *host)
		if (ret)
		return ret;

		if ((host->mmc->pm_flags & MMC_PM_KEEP_POWER) &&
		(host->quirks2 & SDHCI_QUIRK2_HOST_OFF_CARD_ON)) {
		/* Card keeps power but host controller does not */
		sdhci_init(host, 0);
		host->pwr = 0;
		host->clock = 0;
		sdhci_do_set_ios(host, &host->mmc->ios);
		} else {
		sdhci_init(host, (host->mmc->pm_flags & MMC_PM_KEEP_POWER));
		mmiowb();
		}

		ret = mmc_resume_host(host->mmc);
		sdhci_enable_card_detection(host);

include/linux/mmc/sdhci.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -90,6 +90,8 @@ struct sdhci_host {

		unsigned int quirks2; /* More deviations from spec. */

		#define SDHCI_QUIRK2_HOST_OFF_CARD_ON (1<<0)

		int irq; /* Device IRQ */
		void __iomem ioaddr; / Mapped address */

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