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| author | Shawn Guo | 2012-12-11 08:23:42 +0100 |
|---|---|---|
| committer | Chris Ball | 2013-02-11 18:51:23 +0100 |
| commit | 505a8680b78f580245cfb83f37971c7b62bcf991 (patch) | |
| tree | 31e0f2dce7bd7ee700468a8b4bda8553ccaceb1d /drivers/mmc/host/sdhci.c | |
| parent | mmc: sdio: print correct UHS mode during card detection (diff) | |
| download | kernel-qcow2-linux-505a8680b78f580245cfb83f37971c7b62bcf991.tar.gz kernel-qcow2-linux-505a8680b78f580245cfb83f37971c7b62bcf991.tar.xz kernel-qcow2-linux-505a8680b78f580245cfb83f37971c7b62bcf991.zip | |
mmc: sdhci: query card presence from cd-gpio before asking SDHCI
Call mmc_gpio_get_cd() to query card presence from cd-gpio before
asking SDHCI. The rationale behind this change is that flag
SDHCI_QUIRK_BROKEN_CARD_DETECTION is designed for SDHCI controller to
tell that SDHCI_PRESENT_STATE is broken, and it should be used for this
case only. So when cd-gpio is being used, the controller should set
the flag to tell that SDHCI_PRESENT_STATE is not available.
However, the existing code will skip checking cd-gpio as long as flag
SDHCI_QUIRK_BROKEN_CARD_DETECTION is set. Change the querying order
between cd-gpio and SDHCI to support the rationale above.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 6f0bfc0c8c9c..1b97fe2d70ab 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1258,7 +1258,7 @@ static int sdhci_set_power(struct sdhci_host *host, unsigned short power) static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct sdhci_host *host; - bool present; + int present; unsigned long flags; u32 tuning_opcode; @@ -1287,18 +1287,21 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) host->mrq = mrq; - /* If polling, assume that the card is always present. */ - if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) - present = true; - else - present = sdhci_readl(host, SDHCI_PRESENT_STATE) & - SDHCI_CARD_PRESENT; - - /* If we're using a cd-gpio, testing the presence bit might fail. */ - if (!present) { - int ret = mmc_gpio_get_cd(host->mmc); - if (ret > 0) - present = true; + /* + * Firstly check card presence from cd-gpio. The return could + * be one of the following possibilities: + * negative: cd-gpio is not available + * zero: cd-gpio is used, and card is removed + * one: cd-gpio is used, and card is present + */ + present = mmc_gpio_get_cd(host->mmc); + if (present < 0) { + /* If polling, assume that the card is always present. */ + if (host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) + present = 1; + else + present = sdhci_readl(host, SDHCI_PRESENT_STATE) & + SDHCI_CARD_PRESENT; } if (!present || host->flags & SDHCI_DEVICE_DEAD) { |