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sdio: recognize io card without powercycle

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SDIO Simplified Specification V2.00 states that it is strongly recommended
that the host executes either a power reset or issues a CMD52 (I/O Reset)
to re-initialize an I/O only card or the I/O portion of a combo card.
Additionally, the CMD52 must be issued first because it cannot be issued
after a CMD0.

With this patch the Nintendo Wii SDIO-based WLAN card is detected after a
system reset, without requiring a complete system powercycle.

Signed-off-by: Albert Herranz <albert_herranz@yahoo.es>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Albert Herranz
2010-03-10 15:20:37 -08:00
committed by Linus Torvalds
parent d0ab4a4d50
commit 516a824222
3 changed files with 32 additions and 6 deletions
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1
drivers/mmc/core/core.c
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@@ -1089,6 +1089,7 @@ void mmc_rescan(struct work_struct *work)
mmc_claim_host(host);
mmc_power_up(host);
sdio_reset(host);
mmc_go_idle(host);
mmc_send_if_cond(host, host->ocr_avail);