Some board designs for embedded systems do not always bring up the SD Host Write Protect Signal.
This patch defines a new quirk that when enabled enables write access.
>From 032242c62e0fe22eb6f5a4e0311eaab67ef54cbe Mon Sep 17 00:00:00 2001
From: Philip Rakity <prakity@xxxxxxxxxxx>
Date: Sun, 19 Sep 2010 14:34:02 -0700
Subject: [PATCH] sdhci: add quirk for controllers that don't support write only detect
Signed-off-by: Philip Rakity <prakity@xxxxxxxxxxx>
---
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 401527d..e2b1f32 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1213,6 +1213,8 @@ static int sdhci_get_ro(struct mmc_host *mmc)
if (host->flags & SDHCI_DEVICE_DEAD)
present = 0;
+ else if (host->quirks & SDHCI_NO_SUPPORT_FOR_WRITE_PROTECT)
+ present = SDHCI_WRITE_PROTECT;
else
present = sdhci_readl(host, SDHCI_PRESENT_STATE);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index d316bc7..290b5a8 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -247,6 +247,8 @@ struct sdhci_host {
#define SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12 (1<<28)
/* Controller doesn't have HISPD bit field in HI-SPEED SD card */
#define SDHCI_QUIRK_NO_HISPD_BIT (1<<29)
+/* Controller does not have write protect signal */
+#define SDHCI_NO_SUPPORT_FOR_WRITE_PROTECT (1<<30)
int irq; /* Device IRQ */
void __iomem * ioaddr; /* Mapped address */
--
1.6.0.4
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