Date:   Mon, 26 Nov 2018 19:47:10 +0800
From:   Nicolas Boichat <drinkcat@...omium.org>
To:     jjian.zhou@...iatek.com
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        ryder.lee@...iatek.com, sean.wang@...iatek.com,
        linux-mmc@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
        lkml <linux-kernel@...r.kernel.org>, yong.mao@...iatek.com,
        Hsin-Yi Wang <hsinyi@...omium.org>
Subject: Re: [PATCH v2] mmc: mediatek: add MT8183 SDIO driver support

On Thu, Nov 22, 2018 at 4:03 PM Jjian Zhou <jjian.zhou@...iatek.com> wrote:
>
> MT8183 need SDIO driver. So it need add new code
> to support it.

The description does not seem to match what is going on below: I don't
see anything that is obviously MT8183-specific. At first glance, this
seems like a patch that makes it possible to enable MMC_CAP_SDIO_IRQ
("cap-sdio-irq" dt property).

Can you describe in more detail what is going on here?

> Signed-off-by: Jjian Zhou <jjian.zhou@...iatek.com>
> Signed-off-by: Yong mao <yong.mao@...iatek.com>
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
>  drivers/mmc/host/mtk-sd.c | 51 ++++++++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 48 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 6334cc7..da2a047 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -1114,6 +1114,7 @@ static void msdc_start_command(struct msdc_host *host,
>                 struct mmc_request *mrq, struct mmc_command *cmd)
>  {
>         u32 rawcmd;
> +       unsigned long flags;
>
>         WARN_ON(host->cmd);
>         host->cmd = cmd;
> @@ -1131,7 +1132,12 @@ static void msdc_start_command(struct msdc_host *host,
>         cmd->error = 0;
>         rawcmd = msdc_cmd_prepare_raw_cmd(host, mrq, cmd);
>
> +       if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> +               spin_lock_irqsave(&host->lock, flags);
>         sdr_set_bits(host->base + MSDC_INTEN, cmd_ints_mask);
> +       if (host->mmc->caps & MMC_CAP_SDIO_IRQ)
> +               spin_unlock_irqrestore(&host->lock, flags);
> +
>         writel(cmd->arg, host->base + SDC_ARG);
>         writel(rawcmd, host->base + SDC_CMD);
>  }
> @@ -1351,6 +1357,27 @@ static void msdc_request_timeout(struct work_struct *work)
>         }
>  }
>
> +static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
> +{
> +       unsigned long flags;
> +       struct msdc_host *host = mmc_priv(mmc);
> +
> +       if (enb)
> +               pm_runtime_get_sync(host->dev);
> +
> +       spin_lock_irqsave(&host->lock, flags);
> +       if (enb)
> +               sdr_set_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> +       else
> +               sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INTEN_SDIOIRQ);
> +       spin_unlock_irqrestore(&host->lock, flags);
> +
> +       if (!enb) {
> +               pm_runtime_mark_last_busy(host->dev);
> +               pm_runtime_put_autosuspend(host->dev);
> +       }
> +}
> +
>  static irqreturn_t msdc_irq(int irq, void *dev_id)
>  {
>         struct msdc_host *host = (struct msdc_host *) dev_id;
> @@ -1373,7 +1400,12 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
>                 data = host->data;
>                 spin_unlock_irqrestore(&host->lock, flags);
>
> -               if (!(events & event_mask))
> +               if ((events & event_mask) & MSDC_INT_SDIOIRQ) {
> +                       msdc_enable_sdio_irq(host->mmc, 0);
> +                       sdio_signal_irq(host->mmc);
> +               }
> +
> +               if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ)))
>                         break;
>
>                 if (!mrq) {
> @@ -1493,8 +1525,11 @@ static void msdc_init_hw(struct msdc_host *host)
>          */
>         sdr_set_bits(host->base + SDC_CFG, SDC_CFG_SDIO);
>
> -       /* disable detect SDIO device interrupt function */
> -       sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> +       /* 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);
>
>         /* Configure to default data timeout */
>         sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, 3);
> @@ -2013,6 +2048,11 @@ static void msdc_hw_reset(struct mmc_host *mmc)
>         sdr_clr_bits(host->base + EMMC_IOCON, 1);
>  }
>
> +static void msdc_ack_sdio_irq(struct mmc_host *mmc)
> +{
> +       msdc_enable_sdio_irq(mmc, 1);
> +}
> +
>  static const struct mmc_host_ops mt_msdc_ops = {
>         .post_req = msdc_post_req,
>         .pre_req = msdc_pre_req,
> @@ -2020,6 +2060,8 @@ static void msdc_hw_reset(struct mmc_host *mmc)
>         .set_ios = msdc_ops_set_ios,
>         .get_ro = mmc_gpio_get_ro,
>         .get_cd = mmc_gpio_get_cd,
> +       .enable_sdio_irq = msdc_enable_sdio_irq,
> +       .ack_sdio_irq = msdc_ack_sdio_irq,
>         .start_signal_voltage_switch = msdc_ops_switch_volt,
>         .card_busy = msdc_card_busy,
>         .execute_tuning = msdc_execute_tuning,
> @@ -2147,6 +2189,9 @@ static int msdc_drv_probe(struct platform_device *pdev)
>         else
>                 mmc->f_min = DIV_ROUND_UP(host->src_clk_freq, 4 * 4095);
>
> +       if (mmc->caps & MMC_CAP_SDIO_IRQ)
> +               mmc->caps2 |= MMC_CAP2_SDIO_IRQ_NOTHREAD;
> +
>         mmc->caps |= MMC_CAP_ERASE | MMC_CAP_CMD23;
>         /* MMC core transfer sizes tunable parameters */
>         mmc->max_segs = MAX_BD_NUM;
> --
> 1.9.1
>

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