ARM: 6307/1: mmci: allow the card detect GPIO value not to be inverted

On some platforms, the GPIO value from the gpio_cd pin doesn't need to
be inverted to get it active high.  Add a cd_invert platform data
parameter and change existing platforms using GPIO for CD (only
Realview) to enable it.

Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-realview/core.c

@@ -259,13 +259,15 @@ struct mmci_platform_data realview_mmc0_plat_data = {
 	.status		= realview_mmc_status,
 	.gpio_wp	= 17,
 	.gpio_cd	= 16,
+	.cd_invert	= true,
 };
 
 struct mmci_platform_data realview_mmc1_plat_data = {
 	.ocr_mask	= MMC_VDD_32_33|MMC_VDD_33_34,
 	.status		= realview_mmc_status,
 	.gpio_wp	= 19,
 	.gpio_cd	= 18,
+	.cd_invert	= true,
 };
 
 /*

drivers/mmc/host/mmci.c

@@ -570,12 +570,13 @@ static int mmci_get_ro(struct mmc_host *mmc)
 static int mmci_get_cd(struct mmc_host *mmc)
 {
 	struct mmci_host *host = mmc_priv(mmc);
+	struct mmci_platform_data *plat = host->plat;
 	unsigned int status;
 
 	if (host->gpio_cd == -ENOSYS)
-		status = host->plat->status(mmc_dev(host->mmc));
+		status = plat->status(mmc_dev(host->mmc));
 	else
-		status = !gpio_get_value(host->gpio_cd);
+		status = !!gpio_get_value(host->gpio_cd) ^ plat->cd_invert;
 
 	/*
 	 * Use positive logic throughout - status is zero for no card,

include/linux/amba/mmci.h

@@ -24,6 +24,7 @@
  * whether a card is present in the MMC slot or not
  * @gpio_wp: read this GPIO pin to see if the card is write protected
  * @gpio_cd: read this GPIO pin to detect card insertion
+ * @cd_invert: true if the gpio_cd pin value is active low
  * @capabilities: the capabilities of the block as implemented in
  * this platform, signify anything MMC_CAP_* from mmc/host.h
  */
@@ -35,6 +36,7 @@ struct mmci_platform_data {
 	unsigned int (*status)(struct device *);
 	int	gpio_wp;
 	int	gpio_cd;
+	bool	cd_invert;
 	unsigned long capabilities;
 };