[PATCH 1/2] mmc: core: use card pointer as the first parameter of execute_tuning()

[Doug Anderson]

Ulf,

On Mon, Jan 26, 2015 at 7:15 AM, Ulf Hansson <ulf.hansson at linaro.org> wrote:
> On 26 January 2015 at 12:19, Addy Ke <addy.ke at rock-chips.com> wrote:
>> We need to take the card pointer in execute_tuning() for mmc_send_status(),
>
> mmc_send_status() is an mmc core function, not intended for host's to call.
>
>> but mmc->card is NULL in tuning state. So we need change the first parameter
>> of execute_tuning() to card pointer(struct mmc_card * card).
>
> So, why do we need this?

I asked Addy to post upstream against mmc_send_tuning(), but I guess
he didn't (he posted against Alex's NAKed patch instead).

...when I talked to him about it, Addy was asserting that when tuning
fails it is important (at least on dw_mmc on rk3288) that we wait for
the card to stop being busy and that the way to detect was using
mmc_send_status().

That would mean that against upstream you'd need to change
mmc_send_tuning() to take in the card as well (or move the "host->card
= card" assignment to before UHS init, which seems less desirable?)

What do you think about that?  Is there a better solution?

-Doug