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.
Acked-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx>
Signed-off-by: David Vrabel <david.vrabel@xxxxxxx>
---
Andrew, this is a regression in 2.6.36-rc1. Please queue for 2.6.36.
---
drivers/mmc/core/sdio.c | 5 ++---
include/linux/mmc/sdio.h | 2 ++
2 files changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index bd2755e..f332c52 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -362,9 +362,8 @@ static int mmc_sdio_init_card(struct mmc_host *host, u32 ocr,
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 --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
index 329a8fa..245cdac 100644
--- a/include/linux/mmc/sdio.h
+++ b/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
--
1.6.3.3
--
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