ARM: Fix Versatile/Realview/VExpress MMC card detection sense

The MMC card detection sense has become really confused with negations
at various levels, leading to some platforms not detecting inserted
cards.  Fix this by converting everything to positive logic throughout,
thereby getting rid of these negations.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

3 files changed, 8 insertions, 4 deletions

diff --git a/arch/arm/mach-realview/core.c b/arch/arm/mach-realview/core.c
index 595be19f8ad5..02e9fdeb8faf 100644
--- a/arch/arm/mach-realview/core.c
+++ b/arch/arm/mach-realview/core.c
@@ -237,7 +237,7 @@ static unsigned int realview_mmc_status(struct device *dev)
         else
                 mask = 2;
 
-        return !(readl(REALVIEW_SYSMCI) & mask);
+        return readl(REALVIEW_SYSMCI) & mask;
 }
 
 struct mmci_platform_data realview_mmc0_plat_data = {
diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
index d250711b8c7a..c84239761cb4 100644
--- a/arch/arm/mach-vexpress/v2m.c
+++ b/arch/arm/mach-vexpress/v2m.c
@@ -241,7 +241,7 @@ static struct platform_device v2m_flash_device = {
 
 static unsigned int v2m_mmci_status(struct device *dev)
 {
-        return !(readl(MMIO_P2V(V2M_SYS_MCI)) & (1 << 0));
+        return readl(MMIO_P2V(V2M_SYS_MCI)) & (1 << 0);
 }
 
 static struct mmci_platform_data v2m_mmci_data = {
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 4917af96bae1..2ed435bd4b6c 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -539,9 +539,13 @@ static int mmci_get_cd(struct mmc_host *mmc)
         if (host->gpio_cd == -ENOSYS)
                 status = host->plat->status(mmc_dev(host->mmc));
         else
-                status = gpio_get_value(host->gpio_cd);
+                status = !gpio_get_value(host->gpio_cd);
 
-        return !status;
+        /*
+         * Use positive logic throughout - status is zero for no card,
+         * non-zero for card inserted.
+         */
+        return status;
 }
 
 static const struct mmc_host_ops mmci_ops = {