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| author | Guennadi Liakhovetski <g.liakhovetski@gmx.de> | 2012-09-17 16:45:10 +0800 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2012-09-19 16:29:45 +0800 |
| commit | bec9d4e5939987053169a9bb48fc58b6a2d3e237 (patch) | |
| tree | e5a018e18cc34cebe2248c4b169988ebaaa33890 /drivers/mmc | |
| parent | 5413da811fbb11bc0482c92cbb8415073591d462 (diff) | |
| download | op-kernel-dev-bec9d4e5939987053169a9bb48fc58b6a2d3e237.zip op-kernel-dev-bec9d4e5939987053169a9bb48fc58b6a2d3e237.tar.gz | |
mmc: sdhci: Test cd-gpio instead of SDHCI presence when probing
Previously to this patch, an SDHCI platform that uses a GPIO for
card detection instead of the internal SDHCI_CARD_PRESENT bit on
the presence register would fail to detect a new card.
Some drivers worked around this in various ways: esdhc-imx defines
an IO accessor to fake the presence bit being true, s3c turns on
polling (which stops the SDHCI driver from checking the bit) after
a card's inserted. But none of this should be necessary; the real
fix is to check whether we're using a GPIO and avoid relying on
the presence bit if so, as this patch implements.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index d98b199..0e15c79 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -28,6 +28,7 @@ #include <linux/mmc/mmc.h> #include <linux/mmc/host.h> #include <linux/mmc/card.h> +#include <linux/mmc/slot-gpio.h> #include "sdhci.h" @@ -1293,6 +1294,13 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) 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; + } + if (!present || host->flags & SDHCI_DEVICE_DEAD) { host->mrq->cmd->error = -ENOMEDIUM; tasklet_schedule(&host->finish_tasklet); |
