[PATCH V2 0/4] mmc: sdhci-pci: Respect PM flags when enabling card detect GPIO IRQ wakeup

[PATCH V2 0/4] mmc: sdhci-pci: Respect PM flags when enabling card detect GPIO IRQ wakeup

[Adrian Hunter]

Hi

Commit 03dbaa04a2e5 ("mmc: slot-gpio: Add support to enable irq wake on
cd_irq") enabled wakeup irrespective of the host controller's PM flags.
However, users also want to control it from sysfs power/wakeup attribute.
That means the driver needs to check the PM flags before enabling it in the
suspend callback.  Patch 4 adds support for that in sdhci-pci, which is the
only driver presently using the MMC_CAP_CD_WAKE flag.  Patches 1 - 1 tidy
up aspects of sdhci and sdhci-pci wakeup handling, and patch 3 adds a
helper function to make it easy for drivers.

There are 2 contentious aspects to this patch set:

1) An existing problem with the SDIO API which does not let the host
controller driver know that the SDIO function driver has requested SDIO
card interrupt wakeup until the suspend callback - which results in the
host controller driver having to enable or disable wakeup in the suspend
callback.  Fixing the SDIO API is a separate issue IMHO.

2) In order to use the sysfs power/wakeup attribute, the driver must set the
device as wake capable even when it is really a GPIO that wakes the system.


Changes in V2:

      mmc: sdhci-pci: Stop calling sdhci_enable_irq_wakeups()
      mmc: sdhci-pci: Use device wakeup capability to determine MMC_PM_WAKE_SDIO_IRQ capability
      mmc: sdhci: Stop exporting sdhci_enable_irq_wakeups()
      mmc: sdhci: Handle failure of enable_irq_wake()
      mmc: sdhci: Rework sdhci_enable_irq_wakeups()
	Dropped because they have been appled already
      mmc: slot-gpio: Add a function to enable/disable card detect IRQ wakeup
	Re-based


Adrian Hunter (4):
      mmc: sdhci: Do not unnecessarily enable wakeup for card detect interrupt
      mmc: sdhci: Do not unnecessarily enable wakeup for SDIO card interrupt
      mmc: slot-gpio: Add a function to enable/disable card detect IRQ wakeup
      mmc: sdhci-pci: Respect PM flags when enabling card detect GPIO IRQ wakeup

 drivers/mmc/core/core.c           |  3 +--
 drivers/mmc/core/slot-gpio.c      | 25 +++++++++++++++++++++++--
 drivers/mmc/host/sdhci-pci-core.c | 18 ++++++++++++++----
 drivers/mmc/host/sdhci.c          | 23 ++++++++++++++++++++---
 include/linux/mmc/slot-gpio.h     |  1 +
 5 files changed, 59 insertions(+), 11 deletions(-)


Regards
Adrian

[PATCH V2 1/4] mmc: sdhci: Do not unnecessarily enable wakeup for card detect interrupt

[Adrian Hunter]

Do not unnecessarily enable card detect wakeup in the cases that the card
is not removable or a GPIO is used for card detect.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 2020e57ffa7e..c2653347bb5e 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2899,6 +2899,14 @@ static irqreturn_t sdhci_thread_irq(int irq, void *dev_id)
 \*****************************************************************************/
 
 #ifdef CONFIG_PM
+
+static bool sdhci_cd_irq_can_wakeup(struct sdhci_host *host)
+{
+	return mmc_card_is_removable(host->mmc) &&
+	       !(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION) &&
+	       host->mmc->slot.cd_irq < 0;
+}
+
 /*
  * To enable wakeup events, the corresponding events have to be enabled in
  * the Interrupt Status Enable register too. See 'Table 1-6: Wakeup Signal
@@ -2915,7 +2923,7 @@ static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
 	u8 wake_val = 0;
 	u8 val;
 
-	if (!(host->quirks & SDHCI_QUIRK_BROKEN_CARD_DETECTION)) {
+	if (sdhci_cd_irq_can_wakeup(host)) {
 		wake_val |= SDHCI_WAKE_ON_INSERT | SDHCI_WAKE_ON_REMOVE;
 		irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
 	}
-- 
1.9.1

[PATCH V2 2/4] mmc: sdhci: Do not unnecessarily enable wakeup for SDIO card interrupt

[Adrian Hunter]

Do not enable wakeup for SDIO card interrupt unless the SDIO function
driver has requested it which is indicated by mmc_card_wake_sdio_irq().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index c2653347bb5e..565d24ccb2f2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2928,8 +2928,13 @@ static bool sdhci_enable_irq_wakeups(struct sdhci_host *host)
 		irq_val |= SDHCI_INT_CARD_INSERT | SDHCI_INT_CARD_REMOVE;
 	}
 
-	wake_val |= SDHCI_WAKE_ON_INT;
-	irq_val |= SDHCI_INT_CARD_INT;
+	if (mmc_card_wake_sdio_irq(host->mmc)) {
+		wake_val |= SDHCI_WAKE_ON_INT;
+		irq_val |= SDHCI_INT_CARD_INT;
+	}
+
+	if (!irq_val)
+		return false;
 
 	val = sdhci_readb(host, SDHCI_WAKE_UP_CONTROL);
 	val &= ~mask;
-- 
1.9.1

[PATCH V2 3/4] mmc: slot-gpio: Add a function to enable/disable card detect IRQ wakeup

[Adrian Hunter]

Commit 03dbaa04a2e5 ("mmc: slot-gpio: Add support to enable irq wake on
cd_irq") enabled wakeup irrespective of the host controller's PM flags.
However, users also want to control it from sysfs power/wakeup attribute.
That means the driver needs to check the PM flags before enabling it in the
suspend callback. Add helper function mmc_gpio_set_cd_wake() to make it
easy for drivers to do that.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/core.c       |  3 +--
 drivers/mmc/core/slot-gpio.c  | 23 +++++++++++++++++++++++
 include/linux/mmc/slot-gpio.h |  1 +
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index c0ba6d8823b7..7bed23c877de 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -2655,8 +2655,7 @@ void mmc_start_host(struct mmc_host *host)
 void mmc_stop_host(struct mmc_host *host)
 {
 	if (host->slot.cd_irq >= 0) {
-		if (host->slot.cd_wake_enabled)
-			disable_irq_wake(host->slot.cd_irq);
+		mmc_gpio_set_cd_wake(host, false);
 		disable_irq(host->slot.cd_irq);
 	}
 
diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 3698b0576009..817d668aae34 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -154,6 +154,29 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
 }
 EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
 
+int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on)
+{
+	int ret = 0;
+
+	if (!(host->caps & MMC_CAP_CD_WAKE) ||
+	    host->slot.cd_irq < 0 ||
+	    on == host->slot.cd_wake_enabled)
+		return 0;
+
+	if (on) {
+		if (device_may_wakeup(mmc_dev(host))) {
+			ret = enable_irq_wake(host->slot.cd_irq);
+			host->slot.cd_wake_enabled = !ret;
+		}
+	} else {
+		disable_irq_wake(host->slot.cd_irq);
+		host->slot.cd_wake_enabled = false;
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(mmc_gpio_set_cd_wake);
+
 /* Register an alternate interrupt service routine for
  * the card-detect GPIO.
  */
diff --git a/include/linux/mmc/slot-gpio.h b/include/linux/mmc/slot-gpio.h
index 91f1ba0663c8..06607c59c4d0 100644
--- a/include/linux/mmc/slot-gpio.h
+++ b/include/linux/mmc/slot-gpio.h
@@ -31,6 +31,7 @@ int mmc_gpiod_request_ro(struct mmc_host *host, const char *con_id,
 			 unsigned int debounce, bool *gpio_invert);
 void mmc_gpio_set_cd_isr(struct mmc_host *host,
 			 irqreturn_t (*isr)(int irq, void *dev_id));
+int mmc_gpio_set_cd_wake(struct mmc_host *host, bool on);
 void mmc_gpiod_request_cd_irq(struct mmc_host *host);
 bool mmc_can_gpio_cd(struct mmc_host *host);
 bool mmc_can_gpio_ro(struct mmc_host *host);
-- 
1.9.1

[PATCH V2 4/4] mmc: sdhci-pci: Respect PM flags when enabling card detect GPIO IRQ wakeup

[Adrian Hunter]

Commit 03dbaa04a2e5 ("mmc: slot-gpio: Add support to enable irq wake on
cd_irq") enabled wakeup irrespective of the host controller's PM flags.
However, users also want to control it from sysfs power/wakeup attribute.
That means the driver needs to check the PM flags before enabling it in the
suspend callback. Add support for that in sdhci-pci, which is the only
driver presently using the MMC_CAP_CD_WAKE flag, and remove the enabling in
mmc_gpiod_request_cd_irq().

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/core/slot-gpio.c      |  2 --
 drivers/mmc/host/sdhci-pci-core.c | 18 ++++++++++++++----
 drivers/mmc/host/sdhci.c          |  4 ++++
 3 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/core/slot-gpio.c b/drivers/mmc/core/slot-gpio.c
index 817d668aae34..02d5dd815099 100644
--- a/drivers/mmc/core/slot-gpio.c
+++ b/drivers/mmc/core/slot-gpio.c
@@ -149,8 +149,6 @@ void mmc_gpiod_request_cd_irq(struct mmc_host *host)
 
 	if (irq < 0)
 		host->caps |= MMC_CAP_NEEDS_POLL;
-	else if ((host->caps & MMC_CAP_CD_WAKE) && !enable_irq_wake(irq))
-		host->slot.cd_wake_enabled = true;
 }
 EXPORT_SYMBOL(mmc_gpiod_request_cd_irq);
 
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index ce21d86a8141..bd6ee968bcd9 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -41,18 +41,25 @@
 static int sdhci_pci_init_wakeup(struct sdhci_pci_chip *chip)
 {
 	mmc_pm_flag_t pm_flags = 0;
+	bool cap_cd_wake = false;
 	int i;
 
 	for (i = 0; i < chip->num_slots; i++) {
 		struct sdhci_pci_slot *slot = chip->slots[i];
 
-		if (slot)
+		if (slot) {
 			pm_flags |= slot->host->mmc->pm_flags;
+			if (slot->host->mmc->caps & MMC_CAP_CD_WAKE)
+				cap_cd_wake = true;
+		}
 	}
 
-	return device_set_wakeup_enable(&chip->pdev->dev,
-					(pm_flags & MMC_PM_KEEP_POWER) &&
-					(pm_flags & MMC_PM_WAKE_SDIO_IRQ));
+	if ((pm_flags & MMC_PM_KEEP_POWER) && (pm_flags & MMC_PM_WAKE_SDIO_IRQ))
+		return device_wakeup_enable(&chip->pdev->dev);
+	else if (!cap_cd_wake)
+		return device_wakeup_disable(&chip->pdev->dev);
+
+	return 0;
 }
 
 static int sdhci_pci_suspend_host(struct sdhci_pci_chip *chip)
@@ -1698,6 +1705,9 @@ static struct sdhci_pci_slot *sdhci_pci_probe_slot(
 	if (device_can_wakeup(&pdev->dev))
 		host->mmc->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
 
+	if (host->mmc->caps & MMC_CAP_CD_WAKE)
+		device_init_wakeup(&pdev->dev, true);
+
 	if (slot->cd_idx >= 0) {
 		ret = mmc_gpiod_request_cd(host->mmc, NULL, slot->cd_idx,
 					   slot->cd_override_level, 0, NULL);
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 565d24ccb2f2..511a9a51b1c7 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2977,6 +2977,8 @@ int sdhci_suspend_host(struct sdhci_host *host)
 		free_irq(host->irq, host);
 	}
 
+	mmc_gpio_set_cd_wake(host->mmc, true);
+
 	return 0;
 }
 
@@ -3004,6 +3006,8 @@ int sdhci_resume_host(struct sdhci_host *host)
 		mmiowb();
 	}
 
+	mmc_gpio_set_cd_wake(host->mmc, false);
+
 	if (host->irq_wake_enabled) {
 		sdhci_disable_irq_wakeups(host);
 	} else {
-- 
1.9.1