[PATCH v4 0/3] mmc: mediatek: add support for SDIO eint IRQ

[PATCH v4 0/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

Change in v4:
- add MMC_CAP2_SDIO_ASYNC_IRQ judge before lookup eint pinctrl
- replace spin_lock_irqsave() variant with spin_lock() in eint irq handler

Axe Yang (3):
  dt-bindings: mmc: add cap-sdio-async-irq flag
  mmc: core: Add support for SDIO async interrupt
  mmc: mediatek: add support for SDIO eint IRQ

 .../bindings/mmc/mmc-controller.yaml          |   5 +
 drivers/mmc/core/host.c                       |   2 +
 drivers/mmc/core/sdio.c                       |  17 +++
 drivers/mmc/host/mtk-sd.c                     | 124 ++++++++++++++++--
 include/linux/mmc/card.h                      |   3 +-
 include/linux/mmc/host.h                      |   1 +
 include/linux/mmc/sdio.h                      |   5 +
 7 files changed, 148 insertions(+), 9 deletions(-)

-- 
2.25.1

[PATCH v4 1/3] dt-bindings: mmc: add cap-sdio-async-irq flag

[Axe Yang]

Asynchronous interrupt is a mechanism that allow SDIO devices alarm
interrupt when host stop providing clock to card. Add a DT flag to
enable this feature if it is supported by SDIO card.

Signed-off-by: Axe Yang <axe.yang@mediatek.com>
---
 Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
index 513f3c8758aa..16fb06f88471 100644
--- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
+++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
@@ -165,6 +165,11 @@ properties:
     description:
       eMMC hardware reset is supported
 
+  cap-sdio-async-irq:
+    $ref: /schemas/types.yaml#/definitions/flag
+    description:
+      SDIO async interrupt is supported.
+
   cap-sdio-irq:
     $ref: /schemas/types.yaml#/definitions/flag
     description:
-- 
2.25.1

[PATCH v4 2/3] mmc: core: Add support for SDIO async interrupt

[Axe Yang]

If cap-sdio-async-irq flag is set in host dts node, parse EAI
information from SDIO CCCR interrupt externsion segment. If async
interrupt is supported by SDIO card then send command to card to
enable it and set enable_async_irq flag in sdio_cccr structure to 1.
The parse flow is implemented in sdio_read_cccr().

Acked-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Axe Yang <axe.yang@mediatek.com>
---
 drivers/mmc/core/host.c  |  2 ++
 drivers/mmc/core/sdio.c  | 17 +++++++++++++++++
 include/linux/mmc/card.h |  3 ++-
 include/linux/mmc/host.h |  1 +
 include/linux/mmc/sdio.h |  5 +++++
 5 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index cf140f4ec864..a972241548b4 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -410,6 +410,8 @@ int mmc_of_parse(struct mmc_host *host)
 	if (device_property_read_bool(dev, "no-mmc-hs400"))
 		host->caps2 &= ~(MMC_CAP2_HS400_1_8V | MMC_CAP2_HS400_1_2V |
 				 MMC_CAP2_HS400_ES);
+	if (device_property_read_bool(dev, "cap-sdio-async-irq"))
+		host->caps2 |= MMC_CAP2_SDIO_ASYNC_IRQ;
 
 	/* Must be after "non-removable" check */
 	if (device_property_read_u32(dev, "fixed-emmc-driver-type", &drv_type) == 0) {
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index 41164748723d..771fb5d18585 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -225,6 +225,23 @@ static int sdio_read_cccr(struct mmc_card *card, u32 ocr)
 				card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_C;
 			if (data & SDIO_DRIVE_SDTD)
 				card->sw_caps.sd3_drv_type |= SD_DRIVER_TYPE_D;
+
+			if (card->host->caps2 & MMC_CAP2_SDIO_ASYNC_IRQ) {
+				ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_INTERRUPT_EXT, 0,
+						       &data);
+				if (ret)
+					goto out;
+
+				if (data & SDIO_INTERRUPT_EXT_SAI) {
+					data |= SDIO_INTERRUPT_EXT_EAI;
+					ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_INTERRUPT_EXT,
+							       data, NULL);
+					if (ret)
+						goto out;
+
+					card->cccr.enable_async_irq = 1;
+				}
+			}
 		}
 
 		/* if no uhs mode ensure we check for high speed */
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 37f975875102..4df9182bc0e6 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -219,7 +219,8 @@ struct sdio_cccr {
 				wide_bus:1,
 				high_power:1,
 				high_speed:1,
-				disable_cd:1;
+				disable_cd:1,
+				enable_async_irq:1;
 };
 
 struct sdio_cis {
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 7afb57cab00b..502a5418264c 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -402,6 +402,7 @@ struct mmc_host {
 #define MMC_CAP2_CRYPTO		0
 #endif
 #define MMC_CAP2_ALT_GPT_TEGRA	(1 << 28)	/* Host with eMMC that has GPT entry at a non-standard location */
+#define MMC_CAP2_SDIO_ASYNC_IRQ	(1 << 29)	/* SDIO host supports asynchronous interrupt */
 
 	int			fixed_drv_type;	/* fixed driver type for non-removable media */
 
diff --git a/include/linux/mmc/sdio.h b/include/linux/mmc/sdio.h
index 2a05d1ac4f0e..1ef400f28642 100644
--- a/include/linux/mmc/sdio.h
+++ b/include/linux/mmc/sdio.h
@@ -159,6 +159,11 @@
 #define  SDIO_DTSx_SET_TYPE_A	(1 << SDIO_DRIVE_DTSx_SHIFT)
 #define  SDIO_DTSx_SET_TYPE_C	(2 << SDIO_DRIVE_DTSx_SHIFT)
 #define  SDIO_DTSx_SET_TYPE_D	(3 << SDIO_DRIVE_DTSx_SHIFT)
+
+#define SDIO_CCCR_INTERRUPT_EXT	0x16
+#define SDIO_INTERRUPT_EXT_SAI	(1 << 0)
+#define SDIO_INTERRUPT_EXT_EAI	(1 << 1)
+
 /*
  * Function Basic Registers (FBR)
  */
-- 
2.25.1

[PATCH v4 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

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-irq 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-irq;
                ...
        };

Signed-off-by: Axe Yang <axe.yang@mediatek.com>
Signed-off-by: Yong Mao <yong.mao@mediatek.com>
---
 drivers/mmc/host/mtk-sd.c | 124 +++++++++++++++++++++++++++++++++++---
 1 file changed, 116 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..066616ddc88f 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) 2022 MediaTek Inc.
  * Author: Chaotian.Jing <chaotian.jing@mediatek.com>
  */
 
@@ -9,6 +9,7 @@
 #include <linux/clk.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
+#include <linux/gpio/consumer.h>
 #include <linux/iopoll.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
@@ -440,8 +441,12 @@ 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;		/* device interrupt */
+	int sdio_irq_cnt;	/* irq enable cnt */
 	struct reset_control *reset;
 
 	struct clk *src_clk;	/* msdc source clock */
@@ -465,6 +470,7 @@ struct msdc_host {
 	bool hs400_tuning;	/* hs400 mode online tuning */
 	bool internal_cd;	/* Use internal card-detect logic */
 	bool cqhci;		/* support eMMC hw cmdq */
+	bool sdio_eint_ready;	/* Ready to support SDIO eint interrupt */
 	struct msdc_save_para save_para; /* used when gate HCLK */
 	struct msdc_tune_para def_tune_para; /* default tune setting */
 	struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
@@ -1527,10 +1533,12 @@ 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_irq) {
+		if (enb)
+			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)
@@ -2461,6 +2469,49 @@ 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)
+{
+	struct msdc_host *host = dev_id;
+	struct mmc_host *mmc = mmc_from_priv(host);
+
+	spin_lock(&host->lock);
+	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(&host->lock);
+
+	sdio_signal_irq(mmc);
+
+	return IRQ_HANDLED;
+}
+
+static int msdc_request_dat1_eint_irq(struct msdc_host *host)
+{
+	struct gpio_desc *desc;
+	int irq, ret;
+
+	desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
+	if (IS_ERR(desc))
+		return PTR_ERR(desc);
+
+	ret = gpiod_to_irq(desc);
+	if (ret < 0)
+		return ret;
+
+	irq = ret;
+	ret = devm_request_threaded_irq(host->dev, irq, NULL, msdc_sdio_eint_irq,
+					IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					"sdio-eint", host);
+	if (ret)
+		return ret;
+
+	host->eint_irq = irq;
+
+	return 0;
+}
+
 static const struct cqhci_host_ops msdc_cmdq_ops = {
 	.enable         = msdc_cqe_enable,
 	.disable        = msdc_cqe_disable,
@@ -2631,6 +2682,23 @@ static int msdc_drv_probe(struct platform_device *pdev)
 		goto host_free;
 	}
 
+	if (!(mmc->caps2 & MMC_CAP2_NO_SDIO) && (mmc->caps2 & MMC_CAP2_SDIO_ASYNC_IRQ)) {
+		/* 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 = dev_err_probe(&pdev->dev, PTR_ERR(host->pins_dat1),
+						    "Cannot find pinctrl dat1!\n");
+				goto host_free;
+			}
+
+			host->sdio_eint_ready = true;
+		}
+	}
+
 	msdc_of_property_parse(pdev, host);
 
 	host->dev = &pdev->dev;
@@ -2722,6 +2790,16 @@ static int msdc_drv_probe(struct platform_device *pdev)
 	if (ret)
 		goto release;
 
+	if (host->sdio_eint_ready) {
+		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);
@@ -2841,16 +2919,31 @@ 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 (host->sdio_eint_ready) {
+		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);
 	int ret;
@@ -2860,10 +2953,25 @@ static int __maybe_unused msdc_runtime_resume(struct device *dev)
 		return ret;
 
 	msdc_restore_reg(host);
+
+	if (host->sdio_eint_ready) {
+		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;
 }
 
-static int __maybe_unused msdc_suspend(struct device *dev)
+static int __maybe_unused msdc_suspend_noirq(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	int ret;
@@ -2877,13 +2985,13 @@ static int __maybe_unused msdc_suspend(struct device *dev)
 	return pm_runtime_force_suspend(dev);
 }
 
-static int __maybe_unused msdc_resume(struct device *dev)
+static int __maybe_unused msdc_resume_noirq(struct device *dev)
 {
 	return pm_runtime_force_resume(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_noirq, msdc_resume_noirq)
 	SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
 };
 
-- 
2.25.1

Re: [PATCH v4 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:
> 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-irq 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-irq;
>                 ...
>         };
> 
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>

The submitters SoB must be last among all SoB tags. Please, read Submitting
Patches document carefully.

> Signed-off-by: Yong Mao <yong.mao@mediatek.com>

Who is they, why their SoB appeared here?

...

>  /*
> - * Copyright (c) 2014-2015 MediaTek Inc.
> + * Copyright (c) 2022 MediaTek Inc.

This doesn't feel right. Why did you remove old years?

>   * Author: Chaotian.Jing <chaotian.jing@mediatek.com>
>   */

...

> +	desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
> +	if (IS_ERR(desc))
> +		return PTR_ERR(desc);

> +	ret = gpiod_to_irq(desc);
> +	if (ret < 0)
> +		return ret;
> +
> +	irq = ret;

Since both of them are local variables and there is no specific use of the
returned value, I believe it's fine just to

	irq = gpiod_to_irq(desc);
	...

Hmm... I was wondering if you can use fwnode_irq_get_byname().
Ah, it's not (yet) in upstream.

...

>  static int __maybe_unused msdc_runtime_suspend(struct device *dev)
>  {
> +	unsigned long flags;

Can you keep reversed xmas tree order?

>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);

(it means to add new variable here)

>  	return 0;
>  }

...

>  static int __maybe_unused msdc_runtime_resume(struct device *dev)
>  {
> +	unsigned long flags;

Ditto.

>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);
>  	int ret;

>  	return 0;
>  }

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v4 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

On Wed, 2022-01-19 at 21:47 +0200, Andy Shevchenko wrote:
> On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:
> > 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-irq 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-irq;
> >                 ...
> >         };
> > 
> > Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> 
> The submitters SoB must be last among all SoB tags. Please, read
> Submitting
> Patches document carefully.
> 
> > Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> 
> Who is they, why their SoB appeared here?
> 

Yong Mao is the co-developer of this patch, I will reorder the SoB
chains.

> ...
> 
> >  /*
> > - * Copyright (c) 2014-2015 MediaTek Inc.
> > + * Copyright (c) 2022 MediaTek Inc.
> 
> This doesn't feel right. Why did you remove old years?

I should keep the publish year 2014 of this driver.
But I still think range 2014-2022 is the most appropriate way to change
the copyright time. Over these years, mediatek is keeping maintaining
this driver continuously. What do you think?

> 
> >   * Author: Chaotian.Jing <chaotian.jing@mediatek.com>
> >   */
> 
> ...
> 
> > +	desc = devm_gpiod_get(host->dev, "eint", GPIOD_IN);
> > +	if (IS_ERR(desc))
> > +		return PTR_ERR(desc);
> > +	ret = gpiod_to_irq(desc);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	irq = ret;
> 
> Since both of them are local variables and there is no specific use
> of the
> returned value, I believe it's fine just to
> 
> 	irq = gpiod_to_irq(desc);
> 	...

I agree, will fix in next version.

> Hmm... I was wondering if you can use fwnode_irq_get_byname().
> Ah, it's not (yet) in upstream.
> 
> ...
> 
> >  static int __maybe_unused msdc_runtime_suspend(struct device *dev)
> >  {
> > +	unsigned long flags;
> 
> Can you keep reversed xmas tree order?
> 
> >  	struct mmc_host *mmc = dev_get_drvdata(dev);
> >  	struct msdc_host *host = mmc_priv(mmc);
> 
> (it means to add new variable here)

Will fix it in next version.

> 
> >  	return 0;
> >  }
> 
> ...
> 
> >  static int __maybe_unused msdc_runtime_resume(struct device *dev)
> >  {
> > +	unsigned long flags;
> 
> Ditto.

Will fix it in next version.

> 
> >  	struct mmc_host *mmc = dev_get_drvdata(dev);
> >  	struct msdc_host *host = mmc_priv(mmc);
> >  	int ret;
> >  	return 0;
> >  }
> 

--
Best Regard,
Axe Yang

Re: [PATCH v4 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Thu, Jan 20, 2022 at 01:34:08PM +0800, Axe Yang wrote:
> On Wed, 2022-01-19 at 21:47 +0200, Andy Shevchenko wrote:
> > On Wed, Jan 19, 2022 at 06:32:12PM +0800, Axe Yang wrote:

...

> > > Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> > 
> > The submitters SoB must be last among all SoB tags. Please, read
> > Submitting
> > Patches document carefully.
> > 
> > > Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> > 
> > Who is they, why their SoB appeared here?
> 
> Yong Mao is the co-developer of this patch, I will reorder the SoB
> chains.

And you will need to add a corresponding tag.

...

> > > - * Copyright (c) 2014-2015 MediaTek Inc.
> > > + * Copyright (c) 2022 MediaTek Inc.
> > 
> > This doesn't feel right. Why did you remove old years?
> 
> I should keep the publish year 2014 of this driver.
> But I still think range 2014-2022 is the most appropriate way to change
> the copyright time. Over these years, mediatek is keeping maintaining
> this driver continuously. What do you think?

I guess I already showed my opinion on the topic? The common sense tells
me that it should be as simple as '2014-2015,2022' there.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v4 1/3] dt-bindings: mmc: add cap-sdio-async-irq flag

[Ulf Hansson]

On Wed, 19 Jan 2022 at 11:32, Axe Yang <axe.yang@mediatek.com> wrote:
>
> Asynchronous interrupt is a mechanism that allow SDIO devices alarm
> interrupt when host stop providing clock to card. Add a DT flag to
> enable this feature if it is supported by SDIO card.
>
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> ---
>  Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> index 513f3c8758aa..16fb06f88471 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> +++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> @@ -165,6 +165,11 @@ properties:
>      description:
>        eMMC hardware reset is supported
>
> +  cap-sdio-async-irq:
> +    $ref: /schemas/types.yaml#/definitions/flag
> +    description:
> +      SDIO async interrupt is supported.

We already have a DT property for this, I believe.

"wakeup-source" is probably what you want, but we have additional
properties that are related to this too. See more below.

> +
>    cap-sdio-irq:
>      $ref: /schemas/types.yaml#/definitions/flag
>      description:

The above, "cap-sdio-irq", informs whether the SDIO IRQs can be
supported at all, by the host controller.

The property "keep-power-in-suspend" informs whether we can preserve
the power to the card during a suspend/resume cycle. This should be
needed in your case too, I think.

In other words, you may need to combine "cap-sdio-irq",
"wakeup-source" and "keep-power-in-suspend" to describe your HW.

However, what perhaps is missing, is a common MMC/SDIO binding that
let us describe an optional irq-line, which sometimes is being used
for the wakeup irq. In the sdhci-omap case, we look for an irq mapping
towards "wakeup" if specified in the "interrupt-names" property.

In some case, when the SDIO card supports an out-of-band IRQ line, the
similar should be specified in the child-node corresponding to the
SDIO card.

Kind regards
Uffe

Re: [PATCH v4 1/3] dt-bindings: mmc: add cap-sdio-async-irq flag

[Axe Yang]

On Mon, 2022-02-14 at 16:23 +0100, Ulf Hansson wrote:
> On Wed, 19 Jan 2022 at 11:32, Axe Yang <axe.yang@mediatek.com> wrote:
> > 
> > Asynchronous interrupt is a mechanism that allow SDIO devices alarm
> > interrupt when host stop providing clock to card. Add a DT flag to
> > enable this feature if it is supported by SDIO card.
> > 
> > Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> > ---
> >  Documentation/devicetree/bindings/mmc/mmc-controller.yaml | 5
> > +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/mmc/mmc-
> > controller.yaml b/Documentation/devicetree/bindings/mmc/mmc-
> > controller.yaml
> > index 513f3c8758aa..16fb06f88471 100644
> > --- a/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> > +++ b/Documentation/devicetree/bindings/mmc/mmc-controller.yaml
> > @@ -165,6 +165,11 @@ properties:
> >      description:
> >        eMMC hardware reset is supported
> > 
> > +  cap-sdio-async-irq:
> > +    $ref: /schemas/types.yaml#/definitions/flag
> > +    description:
> > +      SDIO async interrupt is supported.
> 
> We already have a DT property for this, I believe.
> 
> "wakeup-source" is probably what you want, but we have additional
> properties that are related to this too. See more below.
> 
> > +
> >    cap-sdio-irq:
> >      $ref: /schemas/types.yaml#/definitions/flag
> >      description:
> 
> The above, "cap-sdio-irq", informs whether the SDIO IRQs can be
> supported at all, by the host controller.
> 
> The property "keep-power-in-suspend" informs whether we can preserve
> the power to the card during a suspend/resume cycle. This should be
> needed in your case too, I think.
> 
> In other words, you may need to combine "cap-sdio-irq",
> "wakeup-source" and "keep-power-in-suspend" to describe your HW.
> 
> However, what perhaps is missing, is a common MMC/SDIO binding that
> let us describe an optional irq-line, which sometimes is being used
> for the wakeup irq. In the sdhci-omap case, we look for an irq
> mapping
> towards "wakeup" if specified in the "interrupt-names" property.
> 
> In some case, when the SDIO card supports an out-of-band IRQ line,
> the
> similar should be specified in the child-node corresponding to the
> SDIO card.
> 
> 

Yes, the intention of the patchset is to wakeup SDIO host in
runtime/system suspend state within SDIO DAT1(in-band wakeup).

I will implement it with "wakeup-source", thanks for your review.