[RESEND v3 0/3] mmc: mediatek: add support for SDIO eint IRQ

[RESEND v3 0/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

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

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                     | 125 ++++++++++++++++--
 include/linux/mmc/card.h                      |   3 +-
 include/linux/mmc/host.h                      |   1 +
 include/linux/mmc/sdio.h                      |   5 +
 7 files changed, 149 insertions(+), 9 deletions(-)

-- 
2.25.1

[RESEND v3 0/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

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

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                     | 125 ++++++++++++++++--
 include/linux/mmc/card.h                      |   3 +-
 include/linux/mmc/host.h                      |   1 +
 include/linux/mmc/sdio.h                      |   5 +
 7 files changed, 149 insertions(+), 9 deletions(-)

-- 
2.25.1


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[RESEND v3 0/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

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

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                     | 125 ++++++++++++++++--
 include/linux/mmc/card.h                      |   3 +-
 include/linux/mmc/host.h                      |   1 +
 include/linux/mmc/sdio.h                      |   5 +
 7 files changed, 149 insertions(+), 9 deletions(-)

-- 
2.25.1


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[RESEND v3 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

[RESEND v3 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


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[RESEND v3 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


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[RESEND v3 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

[RESEND v3 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


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[RESEND v3 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


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[RESEND v3 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 | 125 +++++++++++++++++++++++++++++++++++---
 1 file changed, 117 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..cbdbcce99fd9 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 +2469,50 @@ 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);
+	unsigned long flags;
+
+	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 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 +2683,23 @@ static int msdc_drv_probe(struct platform_device *pdev)
 		goto host_free;
 	}
 
+	if (!(mmc->caps2 & MMC_CAP2_NO_SDIO)) {
+		/* 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 +2791,16 @@ 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 +2920,31 @@ 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 +2954,25 @@ 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 +2986,13 @@ 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

[RESEND v3 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 | 125 +++++++++++++++++++++++++++++++++++---
 1 file changed, 117 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..cbdbcce99fd9 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 +2469,50 @@ 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);
+	unsigned long flags;
+
+	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 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 +2683,23 @@ static int msdc_drv_probe(struct platform_device *pdev)
 		goto host_free;
 	}
 
+	if (!(mmc->caps2 & MMC_CAP2_NO_SDIO)) {
+		/* 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 +2791,16 @@ 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 +2920,31 @@ 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 +2954,25 @@ 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 +2986,13 @@ 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


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Linux-mediatek@lists.infradead.org
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[RESEND v3 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 | 125 +++++++++++++++++++++++++++++++++++---
 1 file changed, 117 insertions(+), 8 deletions(-)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 65037e1d7723..cbdbcce99fd9 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 +2469,50 @@ 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);
+	unsigned long flags;
+
+	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 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 +2683,23 @@ static int msdc_drv_probe(struct platform_device *pdev)
 		goto host_free;
 	}
 
+	if (!(mmc->caps2 & MMC_CAP2_NO_SDIO)) {
+		/* 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 +2791,16 @@ 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 +2920,31 @@ 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 +2954,25 @@ 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 +2986,13 @@ 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


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Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Mon, Jan 17, 2022 at 7:33 PM 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";
>                 ...
>                 pinctrl-2 = <&mmc2_pins_eint>;
>                 pinctrl-3 = <&mmc2_pins_dat1>;
>                 ...
>                 cap-sdio-async-irq;
>                 ...
>         };

...

> +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);

> +       unsigned long flags;

Same Q as per v2. Why do you need this?

Yes, you did the first step to the answer, but I want you to go deeper
and tell me why you need the spin_lock_irqsave() variant.

> +       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;
> +}

-- 
With Best Regards,
Andy Shevchenko

Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Mon, Jan 17, 2022 at 7:33 PM 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";
>                 ...
>                 pinctrl-2 = <&mmc2_pins_eint>;
>                 pinctrl-3 = <&mmc2_pins_dat1>;
>                 ...
>                 cap-sdio-async-irq;
>                 ...
>         };

...

> +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);

> +       unsigned long flags;

Same Q as per v2. Why do you need this?

Yes, you did the first step to the answer, but I want you to go deeper
and tell me why you need the spin_lock_irqsave() variant.

> +       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;
> +}

-- 
With Best Regards,
Andy Shevchenko

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Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Andy Shevchenko]

On Mon, Jan 17, 2022 at 7:33 PM 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";
>                 ...
>                 pinctrl-2 = <&mmc2_pins_eint>;
>                 pinctrl-3 = <&mmc2_pins_dat1>;
>                 ...
>                 cap-sdio-async-irq;
>                 ...
>         };

...

> +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);

> +       unsigned long flags;

Same Q as per v2. Why do you need this?

Yes, you did the first step to the answer, but I want you to go deeper
and tell me why you need the spin_lock_irqsave() variant.

> +       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;
> +}

-- 
With Best Regards,
Andy Shevchenko

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Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

On Tue, 2022-01-18 at 11:18 +0200, Andy Shevchenko wrote:
> On Mon, Jan 17, 2022 at 7:33 PM 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";
> >                 ...
> >                 pinctrl-2 = <&mmc2_pins_eint>;
> >                 pinctrl-3 = <&mmc2_pins_dat1>;
> >                 ...
> >                 cap-sdio-async-irq;
> >                 ...
> >         };
> 
> ...
> 
> > +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);
> > +       unsigned long flags;
> 
> Same Q as per v2. Why do you need this?
> 
> Yes, you did the first step to the answer, but I want you to go
> deeper
> and tell me why you need the spin_lock_irqsave() variant.

You are right, no need to save/restore flags in irq handler.
Will fix it in new version.
Thanks.

> 
> > +       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;
> > +}
> 
> 

Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

On Tue, 2022-01-18 at 11:18 +0200, Andy Shevchenko wrote:
> On Mon, Jan 17, 2022 at 7:33 PM 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";
> >                 ...
> >                 pinctrl-2 = <&mmc2_pins_eint>;
> >                 pinctrl-3 = <&mmc2_pins_dat1>;
> >                 ...
> >                 cap-sdio-async-irq;
> >                 ...
> >         };
> 
> ...
> 
> > +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);
> > +       unsigned long flags;
> 
> Same Q as per v2. Why do you need this?
> 
> Yes, you did the first step to the answer, but I want you to go
> deeper
> and tell me why you need the spin_lock_irqsave() variant.

You are right, no need to save/restore flags in irq handler.
Will fix it in new version.
Thanks.

> 
> > +       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;
> > +}
> 
> 
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Re: [RESEND v3 3/3] mmc: mediatek: add support for SDIO eint IRQ

[Axe Yang]

On Tue, 2022-01-18 at 11:18 +0200, Andy Shevchenko wrote:
> On Mon, Jan 17, 2022 at 7:33 PM 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";
> >                 ...
> >                 pinctrl-2 = <&mmc2_pins_eint>;
> >                 pinctrl-3 = <&mmc2_pins_dat1>;
> >                 ...
> >                 cap-sdio-async-irq;
> >                 ...
> >         };
> 
> ...
> 
> > +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);
> > +       unsigned long flags;
> 
> Same Q as per v2. Why do you need this?
> 
> Yes, you did the first step to the answer, but I want you to go
> deeper
> and tell me why you need the spin_lock_irqsave() variant.

You are right, no need to save/restore flags in irq handler.
Will fix it in new version.
Thanks.

> 
> > +       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;
> > +}
> 
> 
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