From f3c65b2870f2481f3646bc410a58a12989ecc704 Mon Sep 17 00:00:00 2001 From: David Vrabel Date: Thu, 9 Sep 2010 16:37:24 -0700 Subject: [PATCH] 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 Acked-by: Michal Mirolaw Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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 329a8faa..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 -- 2.7.4