Messages in this thread | | | Date | Mon, 26 Jan 2015 17:48:45 +0000 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH 1/2] mmc: core: use card pointer as the first parameter of execute_tuning() |
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On Mon, Jan 26, 2015 at 09:45:07AM -0800, Doug Anderson wrote: > Ulf, > > On Mon, Jan 26, 2015 at 7:15 AM, Ulf Hansson <ulf.hansson@linaro.org> wrote: > > On 26 January 2015 at 12:19, Addy Ke <addy.ke@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?
That sounds like a generic thing though - in which case, what do the specs have to say on this, and does the code implement what it says?
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