Re: [PATCH v9 2/3] mmc: core: Add support for SDIO wakeup interrupt

[Axe Yang <axe.yang@mediatek.com>]

On Fri, 2022-04-01 at 14:42 +0200, Ulf Hansson wrote:
> On Tue, 29 Mar 2022 at 05:29, Axe Yang <axe.yang@mediatek.com> wrote:
> > 
> > If wakeup-source flag is set in host dts node, parse EAI
> > information
> > from SDIO CCCR interrupt externsion segment for in-band wakeup. If
> > async interrupt is supported by SDIO card then enable it and set
> > enable_async_irq flag in sdio_cccr structure to 1. The parse flow
> > is
> > implemented in sdio_read_cccr().
> > 
> > Acked-by: AngeloGioacchino Del Regno <
> > angelogioacchino.delregno@collabora.com>
> > Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> > ---
> >  drivers/mmc/core/sdio.c  | 17 +++++++++++++++++
> >  include/linux/mmc/card.h |  8 +++++++-
> >  include/linux/mmc/sdio.h |  5 +++++
> >  3 files changed, 29 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> > index 25799accf8a0..4898c5e9a299 100644
> > --- a/drivers/mmc/core/sdio.c
> > +++ b/drivers/mmc/core/sdio.c
> > @@ -226,6 +226,23 @@ static int sdio_read_cccr(struct mmc_card
> > *card, u32 ocr)
> >                                 card->sw_caps.sd3_drv_type |=
> > SD_DRIVER_TYPE_C;
> >                         if (data & SDIO_DRIVE_SDTD)
> >                                 card->sw_caps.sd3_drv_type |=
> > SD_DRIVER_TYPE_D;
> > +
> > +                       if (card->host->pm_caps &
> > MMC_PM_WAKE_SDIO_IRQ) {
> 
> After a second thought, I think we can just skip this check. The
> MMC_PM_WAKE_SDIO_IRQ indicates that the host supports SDIO IRQs as
> *system wakeups*.
> 
> But, in fact, I think we want this feature to be enabled to allow
> waking up for runtime_suspend (RPM_SUSPENDED) too.
> 
> > +                               ret = mmc_io_rw_direct(card, 0, 0,
> > SDIO_CCCR_INTERRUPT_EXT, 0,
> > +                                                      &data);
> > +                               if (ret)
> > +                                       goto out;
> > +
> > +                               if (data & SDIO_INTERRUPT_EXT_SAI)
> > {
> > +                                       data |=
> > SDIO_INTERRUPT_EXT_EAI;
> > +                                       ret =
> > mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
> > +                                                              data
> > , NULL);
> > +                                       if (ret)
> > +                                               goto out;
> > +
> > +                                       card->cccr.enable_async_irq 
> > = 1;
> > +                               }
> > +                       }
> >                 }
> 
> 
Will skip this check in next version. Thanks.

Regards,
Axe