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>

1 files changed, 6 insertions, 2 deletions

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 = {