Re: [PATCH] sdio: recognize io card without powercycle

[Pierre Ossman <pierre@ossman.eu>]

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On Thu, 10 Sep 2009 14:56:41 +0200
Albert Herranz <albert_herranz@yahoo.es> wrote:

> 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>
> ---

I had problems with cards already in the idle state crashing when I
sent them a reset. I suggest a big round of testing before merging this.

> @@ -182,3 +189,20 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
>  	return 0;
>  }
>  
> +int sdio_go_idle(struct mmc_host *host)
> +{

It might be clearer if you use the terminology from the spec, so either
sdio_abort() or sdio_reset().

Rgds
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