[RFC/PATCH] mmc: omap_hsmmc: introduce omap_hsmmc_prepare/complete

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Venkat, do you think the patch below makes sense ?

cheers

 drivers/mmc/host/omap_hsmmc.c | 45 ++++++++++++++++++++++++-------------------
 1 file changed, 25 insertions(+), 20 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 54bfd0c..4c8b41e 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c

@@ -2022,6 +2022,26 @@ static int __devexit omap_hsmmc_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
+static int omap_hsmmc_prepare(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->suspend)
+		return host->pdata->suspend(dev, host->slot_id);
+
+	return 0;
+}
+
+static int omap_hsmmc_complete(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->resume)
+		return host->pdata->resume(dev, host->slot_id);
+
+	return 0;
+}
+
 static int omap_hsmmc_suspend(struct device *dev)
 {
 	int ret = 0;

@@ -2035,23 +2055,10 @@ static int omap_hsmmc_suspend(struct device *dev)
 
 	pm_runtime_get_sync(host->dev);
 	host->suspended = 1;
-	if (host->pdata->suspend) {
-		ret = host->pdata->suspend(dev, host->slot_id);
-		if (ret) {
-			dev_dbg(dev, "Unable to handle MMC board"
-					" level suspend\n");
-			host->suspended = 0;
-			return ret;
-		}
-	}
 	ret = mmc_suspend_host(host->mmc);
 
 	if (ret) {
 		host->suspended = 0;
-		if (host->pdata->resume) {
-			if (host->pdata->resume(dev, host->slot_id))
-				dev_dbg(dev, "Unmask interrupt failed\n");
-		}
 		goto err;
 	}
 

@@ -2088,12 +2095,6 @@ static int omap_hsmmc_resume(struct device *dev)
 	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
 		omap_hsmmc_conf_bus_power(host);
 
-	if (host->pdata->resume) {
-		ret = host->pdata->resume(dev, host->slot_id);
-		if (ret)
-			dev_dbg(dev, "Unmask interrupt failed\n");
-	}
-
 	omap_hsmmc_protect_card(host);
 
 	/* Notify the core to resume the host */

@@ -2109,8 +2110,10 @@ static int omap_hsmmc_resume(struct device *dev)
 }
 
 #else
+#define omap_hsmmc_prepare	NULL
+#define omap_hsmmc_complete	NULL
 #define omap_hsmmc_suspend	NULL
-#define omap_hsmmc_resume		NULL
+#define omap_hsmmc_resume	NULL
 #endif
 
 static int omap_hsmmc_runtime_suspend(struct device *dev)

@@ -2138,6 +2141,8 @@ static int omap_hsmmc_runtime_resume(struct device *dev)
 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
 	.suspend	= omap_hsmmc_suspend,
 	.resume		= omap_hsmmc_resume,
+	.prepare	= omap_hsmmc_prepare,
+	.complete	= omap_hsmmc_complete,
 	.runtime_suspend = omap_hsmmc_runtime_suspend,
 	.runtime_resume = omap_hsmmc_runtime_resume,
 };

-- 
1.8.0.rc0

On Mon, Oct 22, 2012 at 03:59:28PM +0300, Felipe Balbi wrote:

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Venkat, do you think the patch below makes sense ?

btw, just checked suspend to ram with beagle and panda. We still have
our filesystem after waking up.

ps: you will [1] to test it:

[1] http://marc.info/?l=linux-arm-kernel&m=135090724817604&w=2

-- 
balbi
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Hi,

On Mon, Oct 22, 2012 at 04:27:08PM +0300, Felipe Balbi wrote:

On Mon, Oct 22, 2012 at 03:59:28PM +0300, Felipe Balbi wrote:

quoted

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Venkat, do you think the patch below makes sense ?

btw, just checked suspend to ram with beagle and panda. We still have
our filesystem after waking up.

ps: you will [1] to test it:

[1] http://marc.info/?l=linux-arm-kernel&m=135090724817604&w=2

ping

quoted

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 54bfd0c..4c8b41e 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c

@@ -2022,6 +2022,26 @@ static int __devexit omap_hsmmc_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
+static int omap_hsmmc_prepare(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->suspend)
+		return host->pdata->suspend(dev, host->slot_id);
+
+	return 0;
+}
+
+static int omap_hsmmc_complete(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->resume)
+		return host->pdata->resume(dev, host->slot_id);
+
+	return 0;
+}
+
 static int omap_hsmmc_suspend(struct device *dev)
 {
 	int ret = 0;

@@ -2035,23 +2055,10 @@ static int omap_hsmmc_suspend(struct device *dev)
 
 	pm_runtime_get_sync(host->dev);
 	host->suspended = 1;
-	if (host->pdata->suspend) {
-		ret = host->pdata->suspend(dev, host->slot_id);
-		if (ret) {
-			dev_dbg(dev, "Unable to handle MMC board"
-					" level suspend\n");
-			host->suspended = 0;
-			return ret;
-		}
-	}
 	ret = mmc_suspend_host(host->mmc);
 
 	if (ret) {
 		host->suspended = 0;
-		if (host->pdata->resume) {
-			if (host->pdata->resume(dev, host->slot_id))
-				dev_dbg(dev, "Unmask interrupt failed\n");
-		}
 		goto err;
 	}
 

@@ -2088,12 +2095,6 @@ static int omap_hsmmc_resume(struct device *dev)
 	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
 		omap_hsmmc_conf_bus_power(host);
 
-	if (host->pdata->resume) {
-		ret = host->pdata->resume(dev, host->slot_id);
-		if (ret)
-			dev_dbg(dev, "Unmask interrupt failed\n");
-	}
-
 	omap_hsmmc_protect_card(host);
 
 	/* Notify the core to resume the host */

@@ -2109,8 +2110,10 @@ static int omap_hsmmc_resume(struct device *dev)
 }
 
 #else
+#define omap_hsmmc_prepare	NULL
+#define omap_hsmmc_complete	NULL
 #define omap_hsmmc_suspend	NULL
-#define omap_hsmmc_resume		NULL
+#define omap_hsmmc_resume	NULL
 #endif
 
 static int omap_hsmmc_runtime_suspend(struct device *dev)

@@ -2138,6 +2141,8 @@ static int omap_hsmmc_runtime_resume(struct device *dev)
 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
 	.suspend	= omap_hsmmc_suspend,
 	.resume		= omap_hsmmc_resume,
+	.prepare	= omap_hsmmc_prepare,
+	.complete	= omap_hsmmc_complete,
 	.runtime_suspend = omap_hsmmc_runtime_suspend,
 	.runtime_resume = omap_hsmmc_runtime_resume,
 };

-- 
1.8.0.rc0

-- 
balbi
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On Thursday 25 October 2012 11:34 PM, Felipe Balbi wrote:

Hi,

On Mon, Oct 22, 2012 at 04:27:08PM +0300, Felipe Balbi wrote:

quoted

On Mon, Oct 22, 2012 at 03:59:28PM +0300, Felipe Balbi wrote:

quoted

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Venkat, do you think the patch below makes sense ?

btw, just checked suspend to ram with beagle and panda. We still have
our filesystem after waking up.

ps: you will [1] to test it:

[1] http://marc.info/?l=linux-arm-kernel&m=135090724817604&w=2

ping

I've been off for the past 3 days. Will test this on Monday once I'm 
back in office.

On Mon, Oct 22, 2012 at 6:29 PM, Felipe Balbi [off-list ref] wrote:

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Venkat, do you think the patch below makes sense ?

Except for the minor nit mentioned below, it works well.
I'll include it in my patch series.

The .complete() function prototype requires to return void.
This one emits a compilation warning.

prepare() is supposed to prevent new children from
being registered. On the MMC subsystem, children
(new cards) registration starts with the card
detect IRQ.

Move card detect IRQ disabling to prepare() so that
no new cards will be registered while we're trying
to suspend.

Likewise, move card detect IRQ enabling to complete()
so we only try to register new children after our MMC
IP is back up.

Signed-off-by: Felipe Balbi <redacted>
---

Fixed ->complete() prototype.

 drivers/mmc/host/omap_hsmmc.c | 43 +++++++++++++++++++++++--------------------
 1 file changed, 23 insertions(+), 20 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 54bfd0c..d2d6a56 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c

@@ -2022,6 +2022,24 @@ static int __devexit omap_hsmmc_remove(struct platform_device *pdev)
 }
 
 #ifdef CONFIG_PM
+static int omap_hsmmc_prepare(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->suspend)
+		return host->pdata->suspend(dev, host->slot_id);
+
+	return 0;
+}
+
+static void omap_hsmmc_complete(struct device *dev)
+{
+	struct omap_hsmmc_host *host = dev_get_drvdata(dev);
+
+	if (host->pdata->resume)
+		host->pdata->resume(dev, host->slot_id);
+}
+
 static int omap_hsmmc_suspend(struct device *dev)
 {
 	int ret = 0;

@@ -2035,23 +2053,10 @@ static int omap_hsmmc_suspend(struct device *dev)
 
 	pm_runtime_get_sync(host->dev);
 	host->suspended = 1;
-	if (host->pdata->suspend) {
-		ret = host->pdata->suspend(dev, host->slot_id);
-		if (ret) {
-			dev_dbg(dev, "Unable to handle MMC board"
-					" level suspend\n");
-			host->suspended = 0;
-			return ret;
-		}
-	}
 	ret = mmc_suspend_host(host->mmc);
 
 	if (ret) {
 		host->suspended = 0;
-		if (host->pdata->resume) {
-			if (host->pdata->resume(dev, host->slot_id))
-				dev_dbg(dev, "Unmask interrupt failed\n");
-		}
 		goto err;
 	}
 

@@ -2088,12 +2093,6 @@ static int omap_hsmmc_resume(struct device *dev)
 	if (!(host->mmc->pm_flags & MMC_PM_KEEP_POWER))
 		omap_hsmmc_conf_bus_power(host);
 
-	if (host->pdata->resume) {
-		ret = host->pdata->resume(dev, host->slot_id);
-		if (ret)
-			dev_dbg(dev, "Unmask interrupt failed\n");
-	}
-
 	omap_hsmmc_protect_card(host);
 
 	/* Notify the core to resume the host */

@@ -2109,8 +2108,10 @@ static int omap_hsmmc_resume(struct device *dev)
 }
 
 #else
+#define omap_hsmmc_prepare	NULL
+#define omap_hsmmc_complete	NULL
 #define omap_hsmmc_suspend	NULL
-#define omap_hsmmc_resume		NULL
+#define omap_hsmmc_resume	NULL
 #endif
 
 static int omap_hsmmc_runtime_suspend(struct device *dev)

@@ -2138,6 +2139,8 @@ static int omap_hsmmc_runtime_resume(struct device *dev)
 static struct dev_pm_ops omap_hsmmc_dev_pm_ops = {
 	.suspend	= omap_hsmmc_suspend,
 	.resume		= omap_hsmmc_resume,
+	.prepare	= omap_hsmmc_prepare,
+	.complete	= omap_hsmmc_complete,
 	.runtime_suspend = omap_hsmmc_runtime_suspend,
 	.runtime_resume = omap_hsmmc_runtime_resume,
 };

-- 
1.8.0