Re: [PATCH] mmc: sdhci: extend wait for busy signalling

[Prasanna NAVARATNA <prasanna.navaratna@gmail.com>]

> 
> I don't think this kind of protocol related code shall remain in the
> host driver. Better keep this in the protocol layer.
> 
> Moreover, most commands can be followed with status command (CMD13) to
> check for busy assertion. I believe this could be a better option to
> use from a generic point of view, since not all mmc controllers
> support hw-check for busy signalling.
> 
> In the cases were CMD13 is not allowed, there are two options to
> improve the situation.
> 1. Extend the usage of host->ops->card_busy in the protocol layer,
> thus provide the option for a host driver to implement a software busy
> check (could be by re-routing pins to GPIO for example)
> 2. MMC_CAP_WAIT_WHILE_BUSY is set by host, thus the hw support busy check.

I had implemented this patch for older version of kernel (3.4.5) and then
ported to latest kernel.
Need to check on card_busy and utilize it. I will re-work on this patch and
will update a newer version in protocol layer.

Thanks,
Prasanna NAVARATNA