diff options
| author | Daniel Willmann <daniel@totalueberwachung.de> | 2014-04-20 01:59:18 +0400 |
|---|---|---|
| committer | Chris Ball <chris@printf.net> | 2014-05-13 02:08:22 +0400 |
| commit | 91769986a724f63db52f3c78c79ac84a5b7045bf (patch) | |
| tree | 495ed726068be0d8f43830dee9e4abad579a6993 /drivers/mmc | |
| parent | 1acee84b6fcfccb2f3488bfdf23664b47e0c445b (diff) | |
| download | linux-91769986a724f63db52f3c78c79ac84a5b7045bf.tar.xz | |
mmc: mxs: fix card detection function for broken card detect
Return -ENOSYS in get_cd if broken-cd is specified in the device tree.
Commit a91fe279ae75 (mmc: mxs: use standard flag for broken card
detection) sets MMC_CAP_NEEDS_POLL when broken-cd is specified. This
driver sets this flag unconditionally as it does not support a card
detect interrupt. Instead, broken-cd means that there is no card detect
signal connected.
The mmc core checks the get_cd function return value to determine if a
card is present. Only for a non-zero return value it will attempt to
initialize the card. So retuning -ENOSYS will allow the card to be
initialized.
For comparison, mmc_gpio_get_cd in slot-gpio.c also returns -ENOSYS if
the card detect GPIO is not valid.
Signed-off-by: Daniel Willmann <daniel@totalueberwachung.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/mxs-mmc.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index 073e871a0fc8..babfea03ba8a 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -70,6 +70,7 @@ struct mxs_mmc_host { unsigned char bus_width; spinlock_t lock; int sdio_irq_en; + bool broken_cd; }; static int mxs_mmc_get_cd(struct mmc_host *mmc) @@ -78,6 +79,9 @@ static int mxs_mmc_get_cd(struct mmc_host *mmc) struct mxs_ssp *ssp = &host->ssp; int present, ret; + if (host->broken_cd) + return -ENOSYS; + ret = mmc_gpio_get_cd(mmc); if (ret >= 0) return ret; @@ -568,6 +572,7 @@ static int mxs_mmc_probe(struct platform_device *pdev) { const struct of_device_id *of_id = of_match_device(mxs_mmc_dt_ids, &pdev->dev); + struct device_node *np = pdev->dev.of_node; struct mxs_mmc_host *host; struct mmc_host *mmc; struct resource *iores; @@ -634,6 +639,8 @@ static int mxs_mmc_probe(struct platform_device *pdev) mmc->caps = MMC_CAP_SD_HIGHSPEED | MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SDIO_IRQ | MMC_CAP_NEEDS_POLL; + host->broken_cd = of_property_read_bool(np, "broken-cd"); + mmc->f_min = 400000; mmc->f_max = 288000000; |