From: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
Normally writes to SDIO function 0 outside the vendor
specific CCCR registers are prohibited. To support embedded
devices that require writes to SDIO function 0 outside this
range (e.g. TI WL127x embedded sdio wifi device),
MMC_QUIRK_LENIENT_FN0 is introduced.
Signed-off-by: Ohad Ben-Cohen <ohad@xxxxxxxxxx>
---
drivers/mmc/core/sdio_io.c | 2 +-
include/linux/mmc/card.h | 3 +++
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index f61fc2d..f9aa8a7 100644
--- a/drivers/mmc/core/sdio_io.c
+++ b/drivers/mmc/core/sdio_io.c
@@ -624,7 +624,7 @@ void sdio_f0_writeb(struct sdio_func *func, unsigned char b, unsigned int addr,
BUG_ON(!func);
- if (addr < 0xF0 || addr > 0xFF) {
+ if ((addr < 0xF0 || addr > 0xFF) && (!mmc_card_lenient_fn0(func->card))) {
if (err_ret)
*err_ret = -EINVAL;
return;
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index eac86fe..bff96cf 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -95,6 +95,7 @@ struct mmc_card {
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
unsigned int quirks; /* card quirks */
+#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
u32 raw_cid[4]; /* raw card CID */
u32 raw_csd[4]; /* raw card CSD */
@@ -130,6 +131,8 @@ struct mmc_card {
#define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
+#define mmc_card_lenient_fn0(c) ((c)->quirks & MMC_QUIRK_LENIENT_FN0)
+
#define mmc_card_name(c) ((c)->cid.prod_name)
#define mmc_card_id(c) (dev_name(&(c)->dev))
--
1.5.4.3
--
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