linux-kernel - [PATCH 05/11] sdhci: Add support for hosts reporting inverted write-protect state

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Message-ID: <20090316211354.GE9375@oksana.dev.rtsoft.ru>
Date:	Tue, 17 Mar 2009 00:13:54 +0300
From:	Anton Vorontsov <avorontsov@...mvista.com>
To:	Pierre Ossman <drzeus-sdhci@...eus.cx>
Cc:	Ben Dooks <ben-linux@...ff.org>, Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Liu Dave <DaveLiu@...escale.com>, sdhci-devel@...t.drzeus.cx,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org
Subject: [PATCH 05/11] 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@...mvista.com>
---
 drivers/mmc/host/sdhci.c |    2 ++
 drivers/mmc/host/sdhci.h |    2 ++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index fc7cb48..c814220 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 968d713..6980f27 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 */
-- 
1.5.6.5

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