diff mbox

[v5,5/9] mmc: dw_mmc: add quirk to indicate missing write protect line

Message ID 1346237295-7116-6-git-send-email-thomas.abraham@linaro.org
State Superseded
Headers show

Commit Message

thomas.abraham@linaro.org Aug. 29, 2012, 10:48 a.m. UTC 
If the write protect pad of the controller is not connected to the write
protect pin of the slot, the driver should be notified of this condition
so that incorrect check for write protection by reading the WRTORT
register can avoided. The get_ro platform callback can be used for in
such cases, but with device tree support enabled, such platform callbacks
cannot be supported.

Add a new quirk for notifying the driver about the missing write protect
line so the driver can assume that the card write protection is disabled.

Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
Acked-by: Will Newton <will.newton@imgtec.com>
---
 drivers/mmc/host/dw_mmc.c  |    4 +++-
 include/linux/mmc/dw_mmc.h |    3 ++-
 2 files changed, 5 insertions(+), 2 deletions(-)
diff mbox

Patch

diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 90c7c7b..1799a2d 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -830,7 +830,9 @@  static int dw_mci_get_ro(struct mmc_host *mmc)
 	struct dw_mci_board *brd = slot->host->pdata;
 
 	/* Use platform get_ro function, else try on board write protect */
-	if (brd->get_ro)
+	if (brd->quirks & DW_MCI_QUIRK_NO_WRITE_PROTECT)
+		read_only = 0;
+	else if (brd->get_ro)
 		read_only = brd->get_ro(slot->id);
 	else
 		read_only =
diff --git a/include/linux/mmc/dw_mmc.h b/include/linux/mmc/dw_mmc.h
index 787ad56..b72e4aa 100644
--- a/include/linux/mmc/dw_mmc.h
+++ b/include/linux/mmc/dw_mmc.h
@@ -205,7 +205,8 @@  struct dw_mci_dma_ops {
 #define DW_MCI_QUIRK_HIGHSPEED			BIT(2)
 /* Unreliable card detection */
 #define DW_MCI_QUIRK_BROKEN_CARD_DETECTION	BIT(3)
-
+/* Write Protect detection not available */
+#define DW_MCI_QUIRK_NO_WRITE_PROTECT		BIT(4)
 
 struct dma_pdata;