sdhci: Add support for hosts reporting inverted write-protect state

This patch adds SDHCI_QUIRK_INVERTED_WRITE_PROTECT quirk. When
specified, the sdhci driver will invert WP state.

p.s. Actually, the quirk is more board-specific than
     controller-specific.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

2 files changed, 4 insertions, 0 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index fc7cb489bdb7..c814220d214e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1149,6 +1149,8 @@ static int sdhci_get_ro(struct mmc_host *mmc)
 
         spin_unlock_irqrestore(&host->lock, flags);
 
+        if (host->quirks & SDHCI_QUIRK_INVERTED_WRITE_PROTECT)
+                return !!(present & SDHCI_WRITE_PROTECT);
         return !(present & SDHCI_WRITE_PROTECT);
 }
 
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 968d713950f1..6980f2725b85 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -216,6 +216,8 @@ struct sdhci_host {
 #define SDHCI_QUIRK_NO_BUSY_IRQ                         (1<<14)
 /* Controller has unreliable card detection */
 #define SDHCI_QUIRK_BROKEN_CARD_DETECTION               (1<<15)
+/* Controller reports inverted write-protect state */
+#define SDHCI_QUIRK_INVERTED_WRITE_PROTECT              (1<<16)
 
         int                     irq;            /* Device IRQ */
         void __iomem *          ioaddr;         /* Mapped address */