From: David Vrabel <david.vrabel@xxxxxxx>
The introduction of support for SD combo cards breaks the initialization
of all CSR SDIO chips. The GO_IDLE (CMD0) in mmc_sd_get_cid() causes CSR
chips to be reset (this is non-standard behavior).
When initializing an SDIO card check for a combo card by using the memory
present bit in the R4 response to IO_SEND_OP_COND (CMD5). This avoids the
call to mmc_sd_get_cid() on an SDIO-only card.
Signed-off-by: David Vrabel <david.vrabel@xxxxxxx>
Acked-by: Michal Mirolaw <mirq-linux@xxxxxxxxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/sdio.c | 5 ++---
include/linux/mmc/sdio.h | 2 ++
2 files changed, 4 insertions(+), 3 deletions(-)
diff -puN drivers/mmc/core/sdio.c~mmc-avoid-getting-cid-on-sdio-only-cards drivers/mmc/core/sdio.c
--- a/drivers/mmc/core/sdio.c~mmc-avoid-getting-cid-on-sdio-only-cards
+++ a/drivers/mmc/core/sdio.c
@@ -362,9 +362,8 @@ static int mmc_sdio_init_card(struct mmc
goto err;
}
- err = mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid);
-
- if (!err) {
+ if (ocr & R4_MEMORY_PRESENT
+ && mmc_sd_get_cid(host, host->ocr & ocr, card->raw_cid) == 0) {
card->type = MMC_TYPE_SD_COMBO;
if (oldcard && (oldcard->type != MMC_TYPE_SD_COMBO ||
diff -puN include/linux/mmc/sdio.h~mmc-avoid-getting-cid-on-sdio-only-cards include/linux/mmc/sdio.h
--- a/include/linux/mmc/sdio.h~mmc-avoid-getting-cid-on-sdio-only-cards
+++ a/include/linux/mmc/sdio.h
@@ -38,6 +38,8 @@
* [8:0] Byte/block count
*/
+#define R4_MEMORY_PRESENT (1 << 27)
+
/*
SDIO status in R5
Type
_
--
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