[PATCH v5 0/3] mmc: mediatek: add support for SDIO async IRQ

[PATCH v5 0/3] mmc: mediatek: add support for SDIO async IRQ

[Axe Yang]

Change in v5:
- resort variables to reversed xmas tree order
- restore old copyright year range and add current year back

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

Changes in v3:
- correct abbreviations with capital letters in commit message
- replace copyright year with 2022 in mtk-sd.c
- remove unnessary pointer casting
- adjust variable order to reversed xmas tree
- remove a redundant blank line
- refine if statement, following standard pattern

Change in v2:
- change flag name from 'cap-sdio-async-int' to 'cap-sdio-async-irq'
- change corresponding macro names from xxx_INT to xxx_IRQ
- resort new member in msdc_host structure
- refine function msdc_request_dat1_eint_irq()
- rename msdc_{suspend,resume} function names, add suffix '_noirq'
- add MMC_CAP2_NO_SDIO judgement before parse eint related pin setting

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                     | 123 ++++++++++++++++--
 include/linux/mmc/card.h                      |   3 +-
 include/linux/mmc/host.h                      |   1 +
 include/linux/mmc/sdio.h                      |   5 +
 7 files changed, 147 insertions(+), 9 deletions(-)

-- 
2.25.1

[PATCH v5 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 v5 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 v5 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;
                ...
        };

Co-developed-by: Yong Mao <yong.mao@mediatek.com>
Signed-off-by: Yong Mao <yong.mao@mediatek.com>
Signed-off-by: Axe Yang <axe.yang@mediatek.com>
---
 drivers/mmc/host/mtk-sd.c | 123 +++++++++++++++++++++++++++++++++++---
 1 file changed, 115 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..f8e38228d810 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) 2014-2015, 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 +2469,48 @@ 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);
+
+	irq = gpiod_to_irq(desc);
+	if (irq < 0)
+		return irq;
+
+	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 +2681,23 @@ 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 +2789,16 @@ 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);
@@ -2843,8 +2920,22 @@ static int __maybe_unused msdc_runtime_suspend(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	struct msdc_host *host = mmc_priv(mmc);
+	unsigned long flags;
 
 	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;
 }
@@ -2853,6 +2944,7 @@ static int __maybe_unused msdc_runtime_resume(struct device *dev)
 {
 	struct mmc_host *mmc = dev_get_drvdata(dev);
 	struct msdc_host *host = mmc_priv(mmc);
+	unsigned long flags;
 	int ret;
 
 	ret = msdc_ungate_clock(host);
@@ -2860,10 +2952,25 @@ 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 +2984,13 @@ 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 v5 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Fri, Jan 21, 2022 at 03:19:42PM +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;
>                 ...
>         };

LGTM, so FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>


> Co-developed-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> ---
>  drivers/mmc/host/mtk-sd.c | 123 +++++++++++++++++++++++++++++++++++---
>  1 file changed, 115 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 65037e1d7723..f8e38228d810 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) 2014-2015, 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 +2469,48 @@ 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);
> +
> +	irq = gpiod_to_irq(desc);
> +	if (irq < 0)
> +		return irq;
> +
> +	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 +2681,23 @@ 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 +2789,16 @@ 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);
> @@ -2843,8 +2920,22 @@ static int __maybe_unused msdc_runtime_suspend(struct device *dev)
>  {
>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);
> +	unsigned long flags;
>  
>  	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;
>  }
> @@ -2853,6 +2944,7 @@ static int __maybe_unused msdc_runtime_resume(struct device *dev)
>  {
>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);
> +	unsigned long flags;
>  	int ret;
>  
>  	ret = msdc_ungate_clock(host);
> @@ -2860,10 +2952,25 @@ 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 +2984,13 @@ 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
> 

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v5 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Chaotian Jing]

On Fri, 2022-01-21 at 15:19 +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;
>                 ...
>         };
> 
> Co-developed-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>
Acked-by: Chaotian Jing <chaotian.jing@mediatek.com>
> ---
>  drivers/mmc/host/mtk-sd.c | 123 +++++++++++++++++++++++++++++++++++-
> --
>  1 file changed, 115 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 65037e1d7723..f8e38228d810 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) 2014-2015, 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 +2469,48 @@ 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);
> +
> +	irq = gpiod_to_irq(desc);
> +	if (irq < 0)
> +		return irq;
> +
> +	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 +2681,23 @@ 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 +2789,16 @@ 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);
> @@ -2843,8 +2920,22 @@ static int __maybe_unused
> msdc_runtime_suspend(struct device *dev)
>  {
>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);
> +	unsigned long flags;
>  
>  	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;
>  }
> @@ -2853,6 +2944,7 @@ static int __maybe_unused
> msdc_runtime_resume(struct device *dev)
>  {
>  	struct mmc_host *mmc = dev_get_drvdata(dev);
>  	struct msdc_host *host = mmc_priv(mmc);
> +	unsigned long flags;
>  	int ret;
>  
>  	ret = msdc_ungate_clock(host);
> @@ -2860,10 +2952,25 @@ 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 +2984,13 @@ 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)
>  };
>  

Re: [PATCH v5 1/3] dt-bindings: mmc: add cap-sdio-async-irq flag

[Rob Herring]

On Fri, 21 Jan 2022 15:19:40 +0800, Axe Yang 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(+)
> 

Reviewed-by: Rob Herring <robh@kernel.org>

Re: [PATCH v5 2/3] mmc: core: Add support for SDIO async interrupt

[Ulf Hansson]

On Fri, 21 Jan 2022 at 08:19, Axe Yang <axe.yang@mediatek.com> wrote:
>
> 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) {

We can probably check host->pm_caps & MMC_PM_WAKE_SDIO_IRQ here,
instead of 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;

As you show in the next patch(3), this flag is useful to read for the
host driver.

However, rather than accessing this flag directly in the host driver,
can you please add a helper function that takes a struct mmc_card* as
in-parameter instead?

> +                               }
> +                       }
>                 }
>
>                 /* 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)
>   */

Kind regards
Uffe

Re: [PATCH v5 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Ulf Hansson]

On Fri, 21 Jan 2022 at 08:19, Axe Yang <axe.yang@mediatek.com> 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";

Looks like you need to update the DT docs too to describe these new
things, right?

>                 ...
>                 pinctrl-2 = <&mmc2_pins_eint>;
>                 pinctrl-3 = <&mmc2_pins_dat1>;
>                 ...
>                 cap-sdio-async-irq;
>                 ...
>         };
>
> Co-developed-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> ---
>  drivers/mmc/host/mtk-sd.c | 123 +++++++++++++++++++++++++++++++++++---
>  1 file changed, 115 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 65037e1d7723..f8e38228d810 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) 2014-2015, 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 +2469,48 @@ 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);
> +
> +       irq = gpiod_to_irq(desc);
> +       if (irq < 0)
> +               return irq;
> +
> +       ret = devm_request_threaded_irq(host->dev, irq, NULL, msdc_sdio_eint_irq,
> +                                       IRQF_TRIGGER_LOW | IRQF_ONESHOT | IRQF_NO_AUTOEN,
> +                                       "sdio-eint", host);

Again, I think you need to update the DT doc to describe these new
IRQ/GPIO things.

> +       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 +2681,23 @@ 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 +2789,16 @@ 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);
> @@ -2843,8 +2920,22 @@ static int __maybe_unused msdc_runtime_suspend(struct device *dev)
>  {
>         struct mmc_host *mmc = dev_get_drvdata(dev);
>         struct msdc_host *host = mmc_priv(mmc);
> +       unsigned long flags;
>
>         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;
>  }
> @@ -2853,6 +2944,7 @@ static int __maybe_unused msdc_runtime_resume(struct device *dev)
>  {
>         struct mmc_host *mmc = dev_get_drvdata(dev);
>         struct msdc_host *host = mmc_priv(mmc);
> +       unsigned long flags;
>         int ret;
>
>         ret = msdc_ungate_clock(host);
> @@ -2860,10 +2952,25 @@ 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 +2984,13 @@ 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)
>  };
>

Overall the approach makes perfect sense to me!

However, I think the code can be simplified and made more robust by
using the wakeirq interface instead. Please have a look at
dev_pm_set_dedicated_wake_irq() and friends. Using them, will let the
runtime PM core deal with disabling/enabling the IRQ, rather than
having to do that manually by the driver, for example.

If you want to get inspired by an existing implementation, please have
a look at the sdhci-omap driver.

Kind regards
Uffe

Re: [PATCH v5 2/3] mmc: core: Add support for SDIO async interrupt

[Axe Yang]

On Mon, 2022-02-14 at 16:34 +0100, Ulf Hansson wrote:
> On Fri, 21 Jan 2022 at 08:19, Axe Yang <axe.yang@mediatek.com> wrote:
> > 
> > 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) {
> 
> We can probably check host->pm_caps & MMC_PM_WAKE_SDIO_IRQ here,
> instead of MMC_CAP2_SDIO_ASYNC_IRQ.

Will update this part in next version.

> 
> > +                               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;
> 
> As you show in the next patch(3), this flag is useful to read for the
> host driver.
> 
> However, rather than accessing this flag directly in the host driver,
> can you please add a helper function that takes a struct mmc_card* as
> in-parameter instead?

OK. I will do that in next version.

> 
> > +                               }
> > +                       }
> >                 }
> > 
> >                 /* 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)
> >   */
> 
Regards,
Axe Yang

Re: [PATCH v5 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

On Mon, 2022-02-14 at 16:54 +0100, Ulf Hansson wrote:
> On Fri, 21 Jan 2022 at 08:19, Axe Yang <axe.yang@mediatek.com> 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";
> 
> Looks like you need to update the DT docs too to describe these new
> things, right?
Will update the docs in next patchset.

> 
> >                 ...
> >                 pinctrl-2 = <&mmc2_pins_eint>;
> >                 pinctrl-3 = <&mmc2_pins_dat1>;
> >                 ...
> >                 cap-sdio-async-irq;
> >                 ...
> >         };
> > 
> > Co-developed-by: Yong Mao <yong.mao@mediatek.com>
> > Signed-off-by: Yong Mao <yong.mao@mediatek.com>
> > Signed-off-by: Axe Yang <axe.yang@mediatek.com>
> > ---
> >  drivers/mmc/host/mtk-sd.c | 123
> > +++++++++++++++++++++++++++++++++++---
> >  1 file changed, 115 insertions(+), 8 deletions(-)
> > 
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index 65037e1d7723..f8e38228d810 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) 2014-2015, 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 +2469,48 @@ 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);
> > +
> > +       irq = gpiod_to_irq(desc);
> > +       if (irq < 0)
> > +               return irq;
> > +
> > +       ret = devm_request_threaded_irq(host->dev, irq, NULL,
> > msdc_sdio_eint_irq,
> > +                                       IRQF_TRIGGER_LOW |
> > IRQF_ONESHOT | IRQF_NO_AUTOEN,
> > +                                       "sdio-eint", host);
> 
> Again, I think you need to update the DT doc to describe these new
> IRQ/GPIO things.
Will update the docs in next patchset.

> 
> > +       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 +2681,23 @@ 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 +2789,16 @@ 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);
> > @@ -2843,8 +2920,22 @@ static int __maybe_unused
> > msdc_runtime_suspend(struct device *dev)
> >  {
> >         struct mmc_host *mmc = dev_get_drvdata(dev);
> >         struct msdc_host *host = mmc_priv(mmc);
> > +       unsigned long flags;
> > 
> >         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;
> >  }
> > @@ -2853,6 +2944,7 @@ static int __maybe_unused
> > msdc_runtime_resume(struct device *dev)
> >  {
> >         struct mmc_host *mmc = dev_get_drvdata(dev);
> >         struct msdc_host *host = mmc_priv(mmc);
> > +       unsigned long flags;
> >         int ret;
> > 
> >         ret = msdc_ungate_clock(host);
> > @@ -2860,10 +2952,25 @@ 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 +2984,13 @@ 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)
> >  };
> > 
> 
> Overall the approach makes perfect sense to me!
> 
> However, I think the code can be simplified and made more robust by
> using the wakeirq interface instead. Please have a look at
> dev_pm_set_dedicated_wake_irq() and friends. Using them, will let the
> runtime PM core deal with disabling/enabling the IRQ, rather than
> having to do that manually by the driver, for example.
> 
> If you want to get inspired by an existing implementation, please
> have
> a look at the sdhci-omap driver.
Will read the wakeirq interfaces and use them in next version. Thanks
for review.

Regards,
Axe Yang