forked from Minki/linux
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 a91fe279ae
(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>
This commit is contained in:
parent
1acee84b6f
commit
91769986a7
@ -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;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user