linux-kernel - RE: [PATCH] linux-next: rsi: fix using of removed stuff from mmc

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Message-id: <000901cf5e26$e1005fa0$a3011ee0$%jun@samsung.com>
Date:	Tue, 22 Apr 2014 21:32:09 +0900
From:	Seungwon Jeon <tgih.jun@...sung.com>
To:	'Ulf Hansson' <ulf.hansson@...aro.org>
Cc:	'Stephen Rothwell' <sfr@...b.auug.org.au>,
	'Fariya Fatima' <fariyaf@...il.com>,
	"'John W. Linville'" <linville@...driver.com>,
	'Jaehoon Chung' <jh80.chung@...sung.com>,
	'Chris Ball' <chris@...ntf.net>, linux-next@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	'linux-mmc' <linux-mmc@...r.kernel.org>
Subject: RE: [PATCH] linux-next: rsi: fix using of removed stuff from mmc

On Tue, April 22, 2014, Ulf Hansson wrote:
> On 22 April 2014 12:53, Seungwon Jeon <tgih.jun@...sung.com> wrote:
> > On Tue, April 22, 2014, Ulf Hansson wrote:
> >> On 22 April 2014 08:57, Seungwon Jeon <tgih.jun@...sung.com> wrote:
> >> > As commit 3957848(mmc: drop the speed mode of card's state) applies,
> >> > this change should be followed.
> >> >
> >> > drivers/net/wireless/rsi/rsi_91x_sdio.c:288:20: error: 'MMC_STATE_HIGHSPEED' undeclared (first
> use
> >> in this function)
> >> > drivers/net/wireless/rsi/rsi_91x_sdio.c:299:4: error: implicit declaration of function
> >> 'mmc_card_set_highspeed' [-Werror=implicit-function-declaration]
> >> > drivers/net/wireless/rsi/rsi_91x_sdio.c:306:2: error: implicit declaration of function
> >> 'mmc_card_highspeed' [-Werror=implicit-function-declaration]
> >> >
> >> > Signed-off-by: Seungwon Jeon <tgih.jun@...sung.com>
> >>
> >> Hi Seungwon,
> >>
> >> Thanks for responding quickly!
> >>
> >> > ---
> >> >  drivers/net/wireless/rsi/rsi_91x_sdio.c |    4 +---
> >> >  1 files changed, 1 insertions(+), 3 deletions(-)
> >> >
> >> > diff --git a/drivers/net/wireless/rsi/rsi_91x_sdio.c b/drivers/net/wireless/rsi/rsi_91x_sdio.c
> >> > index 2e39d38..46e7af4 100644
> >> > --- a/drivers/net/wireless/rsi/rsi_91x_sdio.c
> >> > +++ b/drivers/net/wireless/rsi/rsi_91x_sdio.c
> >> > @@ -285,7 +285,6 @@ static void rsi_reset_card(struct sdio_func *pfunction)
> >> >                 if (err) {
> >> >                         rsi_dbg(ERR_ZONE, "%s: CCCR speed reg read failed: %d\n",
> >> >                                 __func__, err);
> >> > -                       card->state &= ~MMC_STATE_HIGHSPEED;
> >> >                 } else {
> >> >                         err = rsi_cmd52writebyte(card,
> >> >                                                  SDIO_CCCR_SPEED,
> >> > @@ -296,14 +295,13 @@ static void rsi_reset_card(struct sdio_func *pfunction)
> >> >                                         __func__, err);
> >> >                                 return;
> >> >                         }
> >> > -                       mmc_card_set_highspeed(card);
> >> >                         host->ios.timing = MMC_TIMING_SD_HS;
> >> >                         host->ops->set_ios(host, &host->ios);
> >> >                 }
> >> >         }
> >> >
> >> >         /* Set clock */
> >> > -       if (mmc_card_highspeed(card))
> >> > +       if (mmc_card_hs(card))
> >> >                 clock = 50000000;
> >> >         else
> >> >                 clock = card->cis.max_dtr;
> >> > --
> >> > 1.7.0.4
> >> >
> >> >
> >>
> >> I am not sure it's safe to carry this patch through Chris' mmc tree
> >> due to merge conflicts with John's wireless tree.
> >>
> >> Though, since you have changed the mmc_card_highspeed() function to be
> >> named to mmc_card_hs(), we need to work out the dependency.
> >>
> >> We have some options to handle this, I suggest the following.
> >>
> >> Re-spin this patch to keep using mmc_card_highspeed() and let John
> >> take it through his wireless tree. Thus  you also need to keep the
> > It would be better if this patch can be handled in Chris's.
> > Because if the rest of changes of this patch with keeping "mmc_card_highspeed" is applied,
> > high-speed SDIO will be ignored in John's tree.
> 
> You are right Seungwon!
> 
> Please re-spin the patchset on the mmc core an squash the code from
> this patch, into the patch "mmc: drop the speed mode of card's state".
> We then need to get acks from John and Fariya.
Sure! I'll send before long.
You still want to get back naming for mmc_card_highspeed?

> 
> BTW, I had a look at the rsi_reset_card() function
> (drivers/net/wireless/rsi/rsi_91x_sdio.c), which handles a complete
> SDIO re-initialization and I think performs "layering violations"
> while doing that.  I suppose it's because of lack of documentation
> about the mmc/sdio core, but I really don't think an SDIO func driver
> should be doing that kind of stuff by itself. There are APIs to use to
> perform an SDIO reset. Two options exists:
> 
> a) Use pm_runtime_get|put in combination with a MMC_CAP_POWER_OFF_CARD
> enabled host.
> b) Invoke mmc_power_save|restore_host() API.
Yes, we could expect better changes in rsi sdio soon.

Thanks,
Seungwon Jeon
> 
> Kind regards
> Ulf Hansson
> 
> >
> > Thanks,
> > Seungwon Jeon
> >
> >> name mmc_card_highspeed() function from the patches to the mmc core -
> >> could you please re-spin and post new version of those patches as
> >> well!?
> >>
> >> Kind regards
> >> Ulf Hansson
> >

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