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.
> + }
> 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.
> /* 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
