Commit 94144a46 authored by Kevin Liu's avatar Kevin Liu Committed by Chris Ball
Browse files

mmc: sdhci: add get_cd() implementation 



1. mmc_rescan will call get_cd to know whether the card is present
before mmc_rescan_try_freq to avoid useless trials during
card removal or start host is called when card is not present.

2. get_cd needs to be checked to resolve slow card removal issue.

Signed-off-by: default avatarKevin Liu <kliu5@marvell.com>
Signed-off-by: default avatarChris Ball <cjb@laptop.org>
parent 1450734e

drivers/mmc/host/sdhci.c

+32 −0
Original line number Diff line number Diff line
@@ -1581,6 +1581,37 @@ static void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) 
	sdhci_runtime_pm_put(host);

}



static int sdhci_do_get_cd(struct sdhci_host *host)

{

	int gpio_cd = mmc_gpio_get_cd(host->mmc);



	if (host->flags & SDHCI_DEVICE_DEAD)

		return 0;



	/* If polling/nonremovable, assume that the card is always present. */

	if ((host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) ||

	    (host->mmc->caps & MMC_CAP_NONREMOVABLE))

		return 1;



	/* Try slot gpio detect */

	if (!IS_ERR_VALUE(gpio_cd))

		return !!gpio_cd;



	/* Host native card detect */

	return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);

}



static int sdhci_get_cd(struct mmc_host *mmc)

{

	struct sdhci_host *host = mmc_priv(mmc);

	int ret;



	sdhci_runtime_pm_get(host);

	ret = sdhci_do_get_cd(host);

	sdhci_runtime_pm_put(host);

	return ret;

}



static int sdhci_check_ro(struct sdhci_host *host)

{

	unsigned long flags;
@@ -2038,6 +2069,7 @@ static void sdhci_card_event(struct mmc_host *mmc) 
static const struct mmc_host_ops sdhci_ops = {

	.request	= sdhci_request,

	.set_ios	= sdhci_set_ios,

	.get_cd		= sdhci_get_cd,

	.get_ro		= sdhci_get_ro,

	.hw_reset	= sdhci_hw_reset,

	.enable_sdio_irq = sdhci_enable_sdio_irq,

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