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Message-ID: <ff5616ca0cbace3c304b94246f405b5831de1a41.camel@mediatek.com>
Date: Fri, 7 Jan 2022 15:53:35 +0800
From: Axe Yang <axe.yang@...iatek.com>
To: AngeloGioacchino Del Regno
<angelogioacchino.delregno@...labora.com>,
"Ulf Hansson" <ulf.hansson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"Chaotian Jing" <chaotian.jing@...iatek.com>,
Matthias Brugger <matthias.bgg@...il.com>,
Adrian Hunter <adrian.hunter@...el.com>
CC: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Satya Tangirala <satyat@...gle.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
Lucas Stach <dev@...xeye.de>,
Eric Biggers <ebiggers@...gle.com>,
Andrew Jeffery <andrew@...id.au>,
Stephen Boyd <swboyd@...omium.org>,
Kiwoong Kim <kwmad.kim@...sung.com>,
Yue Hu <huyue2@...ong.com>, Tian Tao <tiantao6@...ilicon.com>,
<linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH v1 3/3] mmc: mediatek: add support for SDIO eint irq
On Tue, 2022-01-04 at 11:44 +0100, AngeloGioacchino Del Regno wrote:
> Il 27/12/21 09:36, Axe Yang ha scritto:
> > Add support for eint irq when MSDC is used as an SDIO host. This
> > feature requires SDIO device support async irq function. With this
> > feature,SDIO host can be awakened by SDIO card in suspend state,
> > without additional pin.
> >
> > MSDC driver will time-share the SDIO DAT1 pin. During suspend, MSDC
> > turn off clock and switch SDIO DAT1 pin to GPIO mode. And during
> > resume, switch GPIO function back to DAT1 mode then turn on clock.
> >
> > Some device tree property should be added or modified in msdc node
> > to support SDIO eint irq. Pinctrls named state_dat1 and state_eint
> > are mandatory. And cap-sdio-async-int flag is necessary since this
> > feature depends on asynchronous interrupt:
> > &mmcX {
> > ...
> > pinctrl-names = "default", "state_uhs", "state_eint",
> > "state_dat1";
> > ...
> > pinctrl-2 = <&mmc2_pins_eint>;
> > pinctrl-3 = <&mmc2_pins_dat1>;
> > ...
> > cap-sdio-async-int;
> > ...
> > };
> >
> > Signed-off-by: Axe Yang <axe.yang@...iatek.com>
>
> Hello Axe,
> I agree on Andy's review, and I have some more comments...
>
> > ---
> > drivers/mmc/host/mtk-sd.c | 113
> > ++++++++++++++++++++++++++++++++++++--
> > 1 file changed, 107 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index 4dfc246c5f95..8f23349f2963 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -1,6 +1,6 @@
> > // SPDX-License-Identifier: GPL-2.0-only
> > /*
> > - * Copyright (c) 2014-2015 MediaTek Inc.
> > + * Copyright (c) 2014-2021 MediaTek Inc.
> > * Author: Chaotian.Jing <chaotian.jing@...iatek.com>
> > */
> >
> > @@ -432,9 +432,13 @@ struct msdc_host {
> > struct pinctrl *pinctrl;
> > struct pinctrl_state *pins_default;
> > struct pinctrl_state *pins_uhs;
> > + struct pinctrl_state *pins_eint;
> > + struct pinctrl_state *pins_dat1;
> > struct delayed_work req_timeout;
> > int irq; /* host interrupt */
>
> int eint_irq; should be here, under the host interrupt, for the sake
> of perfection.
Will fix it in next version.
>
> > struct reset_control *reset;
> > + int eint_irq; /* device interrupt */
> > + int sdio_irq_cnt; /* irq enable cnt */
> >
> > struct clk *src_clk; /* msdc source clock */
> > struct clk *h_clk; /* msdc h_clk */
> > @@ -1519,10 +1523,12 @@ static void msdc_enable_sdio_irq(struct
> > mmc_host *mmc, int enb)
> > __msdc_enable_sdio_irq(host, enb);
> > spin_unlock_irqrestore(&host->lock, flags);
> >
> > - if (enb)
> > - pm_runtime_get_noresume(host->dev);
> > - else
> > - pm_runtime_put_noidle(host->dev);
> > + if (mmc->card && !mmc->card->cccr.enable_async_int) {
> > + if (enb)
>
> If you are going to rename `enb` to `enable, this means that you're
> changing the
> function signature... so, please, do that as a separated commit.
Okay, will keep 'enb' in this commit.
>
> > + pm_runtime_get_noresume(host->dev);
> > + else
> > + pm_runtime_put_noidle(host->dev);
> > + }
> > }
> >
> > static irqreturn_t msdc_cmdq_irq(struct msdc_host *host, u32
> > intsts)
> > @@ -2380,6 +2386,49 @@ static const struct mmc_host_ops mt_msdc_ops
> > = {
> > .hw_reset = msdc_hw_reset,
> > };
> >
> > +static irqreturn_t msdc_sdio_eint_irq(int irq, void *dev_id)
> > +{
> > + unsigned long flags;
> > + struct msdc_host *host = (struct msdc_host *)dev_id;
> > + struct mmc_host *mmc = mmc_from_priv(host);
> > +
> > + spin_lock_irqsave(&host->lock, flags);
> > + if (likely(host->sdio_irq_cnt > 0)) {
> > + disable_irq_nosync(host->eint_irq);
> > + disable_irq_wake(host->eint_irq);
> > + host->sdio_irq_cnt--;
> > + }
> > + spin_unlock_irqrestore(&host->lock, flags);
> > +
> > + sdio_signal_irq(mmc);
> > +
> > + return IRQ_HANDLED;
> > +}
> > +
> > +static int msdc_request_dat1_eint_irq(struct msdc_host *host)
> > +{
> > + struct gpio_desc *desc;
> > + int ret = 0;
> > + int irq;
> > +
> > + desc = devm_gpiod_get_index(host->dev, "eint", 0, GPIOD_IN);
> > + if (IS_ERR(desc))
> > + return PTR_ERR(desc);
> > +
> > + irq = gpiod_to_irq(desc);
> > + if (irq >= 0) {
> > + irq_set_status_flags(irq, IRQ_NOAUTOEN);
> > + ret = devm_request_threaded_irq(host->dev, irq, NULL,
> > msdc_sdio_eint_irq,
> > + IRQF_TRIGGER_LOW |
> > IRQF_ONESHOT,
> > + "sdio-eint", host);
>
> I think you may have misunderstood what Andy tried to say in his
> review: your call
> to the function irq_set_status_flags() is using the right flag -- the
> suggestion
> here is to add the IRQF_NO_AUTOEN flag to the call to
> devm_request_threaded_irq()
> (ex: IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_NO_AUTOEN) and remove the
> now redundant
> call to irq_set_status_flags().
Thank you for explanation. Will fix it in next version.
>
>
> > + } else {
> > + ret = irq;
> > + }
> > +
> > + host->eint_irq = irq;
> > + return ret;
> > +}
> > +
> > static const struct cqhci_host_ops msdc_cmdq_ops = {
> > .enable = msdc_cqe_enable,
> > .disable = msdc_cqe_disable,
> > @@ -2534,6 +2583,19 @@ static int msdc_drv_probe(struct
> > platform_device *pdev)
> > goto host_free;
> > }
> >
> > + /* Support for SDIO eint irq */
> > + host->pins_eint = pinctrl_lookup_state(host->pinctrl,
> > "state_eint");
> > + if (IS_ERR(host->pins_eint)) {
> > + dev_dbg(&pdev->dev, "Cannot find pinctrl eint!\n");
> > + } else {
> > + host->pins_dat1 = pinctrl_lookup_state(host->pinctrl,
> > "state_dat1");
> > + if (IS_ERR(host->pins_dat1)) {
> > + ret = PTR_ERR(host->pins_dat1);
> > + dev_err(&pdev->dev, "Cannot find pinctrl
> > dat1!\n");
> > + goto host_free;
> > + }
> > + }
> > +
> > msdc_of_property_parse(pdev, host);
> >
> > host->dev = &pdev->dev;
> > @@ -2621,6 +2683,16 @@ static int msdc_drv_probe(struct
> > platform_device *pdev)
> > if (ret)
> > goto release;
> >
> > + if (!IS_ERR(host->pins_eint) && !IS_ERR(host->pins_dat1)) {
> > + ret = msdc_request_dat1_eint_irq(host);
> > + if (ret) {
> > + dev_err(host->dev, "Failed to register data1
> > eint irq!\n");
> > + goto release;
> > + }
> > +
> > + pinctrl_select_state(host->pinctrl, host->pins_dat1);
> > + }
> > +
> > pm_runtime_set_active(host->dev);
> > pm_runtime_set_autosuspend_delay(host->dev,
> > MTK_MMC_AUTOSUSPEND_DELAY);
> > pm_runtime_use_autosuspend(host->dev);
> > @@ -2740,21 +2812,50 @@ static void msdc_restore_reg(struct
> > msdc_host *host)
> >
> > static int __maybe_unused msdc_runtime_suspend(struct device
> > *dev)
> > {
> > + unsigned long flags;
> > struct mmc_host *mmc = dev_get_drvdata(dev);
> > struct msdc_host *host = mmc_priv(mmc);
> >
> > msdc_save_reg(host);
> > +
> > + if (!IS_ERR(host->pins_eint)) {
> > + disable_irq(host->irq);
> > + pinctrl_select_state(host->pinctrl, host->pins_eint);
> > + spin_lock_irqsave(&host->lock, flags);
> > + if (host->sdio_irq_cnt == 0) {
> > + enable_irq(host->eint_irq);
> > + enable_irq_wake(host->eint_irq);
> > + host->sdio_irq_cnt++;
> > + }
> > + sdr_clr_bits(host->base + SDC_CFG, SDC_CFG_SDIOIDE);
> > + spin_unlock_irqrestore(&host->lock, flags);
> > + }
> > msdc_gate_clock(host);
> > return 0;
> > }
> >
> > static int __maybe_unused msdc_runtime_resume(struct device *dev)
> > {
> > + unsigned long flags;
> > struct mmc_host *mmc = dev_get_drvdata(dev);
> > struct msdc_host *host = mmc_priv(mmc);
> >
> > msdc_ungate_clock(host);
> > msdc_restore_reg(host);
> > + if (!IS_ERR(host->pins_eint)) {
> > + spin_lock_irqsave(&host->lock, flags);
> > + if (host->sdio_irq_cnt > 0) {
> > + disable_irq_nosync(host->eint_irq);
> > + disable_irq_wake(host->eint_irq);
> > + host->sdio_irq_cnt--;
> > + sdr_set_bits(host->base + SDC_CFG,
> > SDC_CFG_SDIOIDE);
> > + } else {
> > + sdr_clr_bits(host->base + MSDC_INTEN,
> > MSDC_INTEN_SDIOIRQ);
> > + }
> > + spin_unlock_irqrestore(&host->lock, flags);
> > + pinctrl_select_state(host->pinctrl, host->pins_uhs);
> > + enable_irq(host->irq);
> > + }
> > return 0;
> > }
> >
> > @@ -2778,7 +2879,7 @@ static int __maybe_unused msdc_resume(struct
> > device *dev)
> > }
> >
> > static const struct dev_pm_ops msdc_dev_pm_ops = {
> > - SET_SYSTEM_SLEEP_PM_OPS(msdc_suspend, msdc_resume)
> > + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(msdc_suspend, msdc_resume)
>
> Just a nitpick: msdc_{suspend,resume} are now noirq, so you should
> change the
> function names to msdc_suspend_noirq, msdc_resume_noirq.
Will fix it in next version. Thank you for your suggestion.
>
> > SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume,
> > NULL)
> > };
> >
> >
>
> Regards,
> - Angelo
>
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