On Mon, 17 Jun 2019 at 07:57, jjian zhou <jjian.zhou@xxxxxxxxxxxx> wrote:
>
> On Fri, 2019-06-14 at 17:46 +0800, Ulf Hansson wrote:
> > On Fri, 14 Jun 2019 at 07:26, Jjian Zhou <jjian.zhou@xxxxxxxxxxxx> wrote:
> > >
> > > From: jjian zhou <jjian.zhou@xxxxxxxxxxxx>
> > >
> > > SDIO IRQ is triggered by low level. It need disable SDIO IRQ
> > > detected function. Otherwise the interrupt register can't be cleared.
> > > It will process the interrupt more.
> > >
> > > Signed-off-by: Jjian Zhou <jjian.zhou@xxxxxxxxxxxx>
> > > Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
> > > Signed-off-by: Yong Mao <yong.mao@xxxxxxxxxxxx>
> > > ---
> > > drivers/mmc/host/mtk-sd.c | 13 +++++++------
> > > 1 file changed, 7 insertions(+), 6 deletions(-)
> > >
> > > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > > index c518cc2..29992ae 100644
> > > --- a/drivers/mmc/host/mtk-sd.c
> > > +++ b/drivers/mmc/host/mtk-sd.c
> > > @@ -1389,10 +1389,12 @@ static void __msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
> > > struct msdc_host *host = mmc_priv(mmc);
> > >
> > > spin_lock_irqsave(&host->lock, flags);
> > > - if (enb)
> > > + if (enb) {
> > > sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> > > - else
> > > + sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> > > + } else {
> > > sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> >
> > Rather than clearing SDC_CFG_SDIOIDE in the irq handler, you need to
> > do it here. As otherwise when the mmc core calls
> > host->ops->enable_sdio_irq() to disable the SDIO IRQ, it may stay
> > enabled.
> >
>
> Thank you for your review.
>
> I remove the spin lock in "__msdc_enable_sdio_irq" and add
> spin lock in "msdc_enable_sdio_irq". The modification of
> "__msdc_enable_sdio_irq" and "msdc_enable_sdio_irq" is as following.
>
> static void __msdc_enable_sdio_irq(struct msdc_host *host, int enb)
> {
> if (enb) {
> sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> } else {
> sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> }
> }
>
> static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
> {
> unsigned long flags;
> struct msdc_host *host = mmc_priv(mmc);
> spin_lock_irqsave(&host->lock, flags);;
> __msdc_enable_sdio_irq(host, enb);
> spin_unlock_irqrestore(&host->lock, flags);
>
> if (enb)
> pm_runtime_get_noresume(host->dev);
> else
> pm_runtime_get_noidle(host->dev);
> }
>
> > > + }
> > > spin_unlock_irqrestore(&host->lock, flags);
> > > }
> > >
> > > @@ -1422,6 +1424,8 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
> > > spin_lock_irqsave(&host->lock, flags);
> > > events = readl(host->base + MSDC_INT);
> > > event_mask = readl(host->base + MSDC_INTEN);
> > > + if ((events & event_mask) & MSDC_INT_SDIOIRQ)
> > > + sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> >
> > As stated above, I suggest you move this into __msdc_enable_sdio_irq()
> > and thus call that function from here instead. Well, that doesn't work
> > as is, because of the spin lock, so you rather need to make a
> > sub-function of __msdc_enable_sdio_irq, that don't take/releases the
> > lock.
> >
> > I hope that was clear. If not, I can post a patch to show you what I mean.
> >
>
> I also modify this part handler in msdc_irq.
>
> spin_lock_irqsave(&host->lock, flags);
> events = readl(host->base + MSDC_INT);
> event_mask = readl(host->base + MSDC_INTEN);
> if ((events & event_mask) & MSDC_INT_SDIOIRQ)
> __msdc_enable_sdio_irq(host, 0);
> /* clear interrupts */
> writel(events & event_mask, host->base + MSDC_INT);
>
> mrq = host->mrq;
> cmd = host->cmd;
> data = host->data;
> spin_unlock_irqrestore(&host->lock, flags);
>
> if ((events & event_mask) & MSDC_INT_SDIOIRQ)
> sdio_signal_irq(host->mmc);
>
> I also will add spin lock in the "msdc_ack_sdio_irq".
>
> Looking forward to your suggestions.
Seems reasonable, please post a new version, then I will review again.
[...]
Kind regards
Uffe
