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| author | David Vrabel <david.vrabel@csr.com> | 2010-09-09 16:37:24 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-09-09 18:57:22 -0700 |
| commit | f3c65b2870f2481f3646bc410a58a12989ecc704 (patch) | |
| tree | ef33d62ee503a43645aae49119a94dc0339fe4b0 | |
| parent | 152831be91dfe864e06c3b3ff2bf994e04df4cdf (diff) | |
| download | linux-f3c65b2870f2481f3646bc410a58a12989ecc704.tar.gz linux-f3c65b2870f2481f3646bc410a58a12989ecc704.tar.bz2 linux-f3c65b2870f2481f3646bc410a58a12989ecc704.zip | |
mmc: avoid getting CID on SDIO-only cards
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@csr.com>
Acked-by: Michal Mirolaw <mirq-linux@rere.qmqm.pl>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/mmc/core/sdio.c | 5 | ||||
| -rw-r--r-- | 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 bd2755e8d9a3..f332c52968b7 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 329a8faa6e37..245cdacee544 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 |