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authorThomas Abraham <thomas.abraham@linaro.org>2012-09-17 18:16:39 +0000
committerChris Ball <cjb@laptop.org>2012-10-03 10:05:16 -0400
commitb4967aa58e2bbafbb280dd4f0c5a777181500e41 (patch)
tree3899b2b1cd497a416a885f552b2f5ecdeaf7b0a8 /drivers/mmc
parentf90a0612f0e110a8af976835273124dff4fa8b3d (diff)
downloadlinux-b4967aa58e2bbafbb280dd4f0c5a777181500e41.tar.bz2
mmc: dw_mmc: add quirk to indicate missing write protect line
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> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/dw_mmc.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index de45ad24becb..455a155406bc 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 =