[PATCH] mmc: mxs-mmc: implement broken-cd

[lauri.hintsala@bluegiga.com (Lauri Hintsala)]

This feature allows to use SDIO bus without wiring card detect
signal. This is relevant in cases where SDIO device is connected to
SDIO bus and there is no way to disconnect device from bus (device
is always present).

Signed-off-by: Lauri Hintsala <lauri.hintsala@bluegiga.com>
---
 drivers/mmc/host/mxs-mmc.c |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c
index ad3fcea..992760e 100644
--- a/drivers/mmc/host/mxs-mmc.c
+++ b/drivers/mmc/host/mxs-mmc.c
@@ -165,6 +165,7 @@ struct mxs_mmc_host {
 	int				sdio_irq_en;
 	int				wp_gpio;
 	bool				wp_inverted;
+	bool				broken_cd;
 };
 
 static int mxs_mmc_get_ro(struct mmc_host *mmc)
@@ -187,6 +188,9 @@ static int mxs_mmc_get_cd(struct mmc_host *mmc)
 {
 	struct mxs_mmc_host *host = mmc_priv(mmc);
 
+	if (host->broken_cd)
+		return -ENOSYS;
+
 	return !(readl(host->base + HW_SSP_STATUS(host)) &
 		 BM_SSP_STATUS_CARD_DETECT);
 }
@@ -808,6 +812,9 @@ static int mxs_mmc_probe(struct platform_device *pdev)
 							&flags);
 		if (flags & OF_GPIO_ACTIVE_LOW)
 			host->wp_inverted = 1;
+
+		if (of_get_property(np, "broken-cd", NULL))
+			host->broken_cd = 1;
 	} else {
 		if (pdata->flags & SLOTF_8_BIT_CAPABLE)
 			mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_8_BIT_DATA;
-- 
1.7.9.5