[PATCH V3 0/2] Suspend for gpio-vbus

[PATCH V3 0/2] Suspend for gpio-vbus

[Dmitry Eremin-Solenikov]

V1 version of these patches generated quite a lot of comments.
Now I'd like to present an updated version of this patchset.

Changes since V2:
* Really include all promised features. Blaming git format-patch :(

Changes since V1:
* Switch to using dev_pm_ops instead of platform_driver hooks
* Move suspend/resume to _noirq (LATE) to be sure that otg transceiver
 suspends after the main UDC driver.

Dmitry Eremin-Solenikov (2):
      gpio-vbus: support disabling D+ pullup on suspend
      mioa701: move gpio-pullup functionality to gpio-vbus

 arch/arm/mach-pxa/mioa701.c   |    8 +-----
 drivers/usb/otg/gpio_vbus.c   |   42 +++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/gpio_vbus.h |    1 +
 3 files changed, 45 insertions(+), 6 deletions(-)

[PATCH V3 1/2] gpio-vbus: support disabling D+ pullup on suspend

[Dmitry Eremin-Solenikov]

Some platforms would like to disable D+ pullup on suspend, to drain as
low power, as possible. E.g. this was requested by mioa701 board
maintainers.

Suspend/resume is done in _noirq path, to force handling of pullup after
the main UDC driver suspend/before resume.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
---
 drivers/usb/otg/gpio_vbus.c   |   42 +++++++++++++++++++++++++++++++++++++++++
 include/linux/usb/gpio_vbus.h |    1 +
 2 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/otg/gpio_vbus.c b/drivers/usb/otg/gpio_vbus.c
index 52733d9..0754445 100644
--- a/drivers/usb/otg/gpio_vbus.c
+++ b/drivers/usb/otg/gpio_vbus.c
@@ -327,6 +327,47 @@ static int __exit gpio_vbus_remove(struct platform_device *pdev)
 	return 0;
 }
 
+#ifdef CONFIG_PM
+static int gpio_vbus_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+	struct gpio_vbus_mach_info *pdata = gpio_vbus->dev->platform_data;
+
+	if (gpio_vbus->otg.gadget && pdata->disconnect_on_suspend) {
+		/* optionally disable D+ pullup */
+		if (gpio_is_valid(pdata->gpio_pullup))
+			gpio_set_value(pdata->gpio_pullup,
+					pdata->gpio_pullup_inverted);
+
+		set_vbus_draw(gpio_vbus, 0);
+	}
+	return 0;
+}
+
+static int gpio_vbus_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct gpio_vbus_data *gpio_vbus = platform_get_drvdata(pdev);
+
+	if (gpio_vbus->otg.gadget)
+		schedule_work(&gpio_vbus->work);
+
+	return 0;
+}
+static const struct dev_pm_ops gpio_vbus_pm_ops = {
+	.suspend_noirq = gpio_vbus_suspend,
+	.resume_noirq = gpio_vbus_resume,
+	.freeze_noirq = gpio_vbus_suspend,
+	.thaw_noirq = gpio_vbus_resume,
+	.poweroff_noirq = gpio_vbus_suspend,
+	.restore_noirq = gpio_vbus_resume,
+};
+#define GPIO_VBUS_PM_OPS &gpio_vbus_pm_ops
+#else
+#define GPIO_VBUS_PM_OPS NULL
+#endif
+
 /* NOTE:  the gpio-vbus device may *NOT* be hotplugged */
 
 MODULE_ALIAS("platform:gpio-vbus");
@@ -335,6 +376,7 @@ static struct platform_driver gpio_vbus_driver = {
 	.driver = {
 		.name  = "gpio-vbus",
 		.owner = THIS_MODULE,
+		.pm = GPIO_VBUS_PM_OPS,
 	},
 	.remove  = __exit_p(gpio_vbus_remove),
 };
diff --git a/include/linux/usb/gpio_vbus.h b/include/linux/usb/gpio_vbus.h
index d9f03cc..2faa38d 100644
--- a/include/linux/usb/gpio_vbus.h
+++ b/include/linux/usb/gpio_vbus.h
@@ -27,4 +27,5 @@ struct gpio_vbus_mach_info {
 	int gpio_pullup;
 	bool gpio_vbus_inverted;
 	bool gpio_pullup_inverted;
+	bool disconnect_on_suspend;
 };
-- 
1.7.5.4

[PATCH V3 2/2] mioa701: move gpio-pullup functionality to gpio-vbus

[Dmitry Eremin-Solenikov]

gpio-vbus can (and should?) handle D+ pullup gpio for us. Move
gpio-pullup handling to gpio-vbus and stop providing udc_info as it's
empty now. Also tell gpio-vbus that it should disable D+ pullup on
suspend, as did pxa27x_udc driver.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
---
 arch/arm/mach-pxa/mioa701.c |    8 ++------
 1 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-pxa/mioa701.c b/arch/arm/mach-pxa/mioa701.c
index bcbd359..2039a53 100644
--- a/arch/arm/mach-pxa/mioa701.c
+++ b/arch/arm/mach-pxa/mioa701.c
@@ -402,14 +402,11 @@ static void gsm_exit(void)
 /*
  * USB UDC
  */
-static struct pxa2xx_udc_mach_info mioa701_udc_info = {
-	.gpio_pullup	  = GPIO22_USB_ENABLE,
-};
-
 struct gpio_vbus_mach_info gpio_vbus_data = {
 	.gpio_vbus = GPIO13_nUSB_DETECT,
 	.gpio_vbus_inverted = 1,
-	.gpio_pullup = -1,
+	.gpio_pullup = GPIO22_USB_ENABLE,
+	.disconnect_on_suspend = 1,
 };
 
 /*
@@ -770,7 +767,6 @@ static void __init mioa701_machine_init(void)
 	pxa_set_fb_info(NULL, &mioa701_pxafb_info);
 	pxa_set_mci_info(&mioa701_mci_info);
 	pxa_set_keypad_info(&mioa701_keypad_info);
-	pxa_set_udc_info(&mioa701_udc_info);
 	pxa_set_ac97_info(&mioa701_ac97_info);
 	pm_power_off = mioa701_poweroff;
 	arm_pm_restart = mioa701_restart;
-- 
1.7.5.4