On Fri, 2019-06-14 at 17:46 +0800, Ulf Hansson wrote:
> On Fri, 14 Jun 2019 at 07:26, Jjian Zhou <jjian.z...@mediatek.com> wrote:
> >
> > From: jjian zhou <jjian.z...@mediatek.com>
> >
> > 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.z...@mediatek.com>
> > Signed-off-by: Chaotian Jing <chaotian.j...@mediatek.com>
> > Signed-off-by: Yong Mao <yong....@mediatek.com>
> > ---
> > 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.
>
> > /* clear interrupts */
> > writel(events & event_mask, host->base + MSDC_INT);
> >
> > @@ -1572,10 +1576,7 @@ static void msdc_init_hw(struct msdc_host *host)
> > sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
> >
> > /* Config SDIO device detect interrupt function */
> > - if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> > - sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> > - else
> > - sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> > + sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> >
> > /* Configure to default data timeout */
> > sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
> > --
> > 1.9.1
> >
>
> Kind regards
> Uffe
