diff options
| author | Kevin Liu <kliu5@marvell.com> | 2013-02-28 17:35:53 +0800 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-03-22 12:24:50 -0400 |
| commit | 94144a465dd0b34b3249f988a09472d0f57ad2b7 (patch) | |
| tree | 207bb564e0a1f6a0a4762f579dc09c7f119c86f1 /drivers/mmc/host | |
| parent | 1450734ec61cda7bbb77afc8cb412b9d64c62d9a (diff) | |
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: Kevin Liu <kliu5@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 51bbba486f38..81d52942677c 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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, |