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Commit dc6e69e6 authored by Marek Szyprowski's avatar Marek Szyprowski Committed by Felipe Balbi
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usb: dwc2: gadget: rework suspend/resume code to correctly restore gadget state 



Suspend/resume code assumed that the gadget was always started and
enabled to connect to usb bus. This means that the actual state of the
gadget (started/stopped or connected/disconnected) was not correctly
preserved on suspend/resume cycle. This patch fixes this issue.

Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 7ad8096e

drivers/usb/dwc2/core.h

+2 −1
Original line number Diff line number Diff line
@@ -688,8 +688,9 @@ struct dwc2_hsotg { 
	u8 ctrl_buff[8];



	struct usb_gadget gadget;

	unsigned int enabled:1;

	unsigned int connected:1;

	unsigned int setup;

	unsigned int setup:1;

	unsigned long last_rst;

	struct s3c_hsotg_ep *eps;

#endif /* CONFIG_USB_DWC2_PERIPHERAL || CONFIG_USB_DWC2_DUAL_ROLE */

drivers/usb/dwc2/gadget.c

+22 −17
Original line number Diff line number Diff line
@@ -2889,6 +2889,7 @@ static int s3c_hsotg_udc_start(struct usb_gadget *gadget, 
	spin_lock_irqsave(&hsotg->lock, flags);

	s3c_hsotg_init(hsotg);

	s3c_hsotg_core_init_disconnected(hsotg);

	hsotg->enabled = 0;

	spin_unlock_irqrestore(&hsotg->lock, flags);



	dev_info(hsotg->dev, "bound driver %s\n", driver->driver.name);
@@ -2929,6 +2930,7 @@ static int s3c_hsotg_udc_stop(struct usb_gadget *gadget) 


	hsotg->driver = NULL;

	hsotg->gadget.speed = USB_SPEED_UNKNOWN;

	hsotg->enabled = 0;



	spin_unlock_irqrestore(&hsotg->lock, flags);
@@ -2972,9 +2974,11 @@ static int s3c_hsotg_pullup(struct usb_gadget *gadget, int is_on) 
	spin_lock_irqsave(&hsotg->lock, flags);

	if (is_on) {

		clk_enable(hsotg->clk);

		hsotg->enabled = 1;

		s3c_hsotg_core_connect(hsotg);

	} else {

		s3c_hsotg_core_disconnect(hsotg);

		hsotg->enabled = 0;

		clk_disable(hsotg->clk);

	}
@@ -3585,11 +3589,14 @@ int s3c_hsotg_suspend(struct dwc2_hsotg *hsotg) 


	mutex_lock(&hsotg->init_mutex);



	if (hsotg->driver)

	if (hsotg->driver) {

		int ep;



		dev_info(hsotg->dev, "suspending usb gadget %s\n",

			 hsotg->driver->driver.name);



		spin_lock_irqsave(&hsotg->lock, flags);

		if (hsotg->enabled)

			s3c_hsotg_core_disconnect(hsotg);

		s3c_hsotg_disconnect(hsotg);

		hsotg->gadget.speed = USB_SPEED_UNKNOWN;
@@ -3597,8 +3604,6 @@ int s3c_hsotg_suspend(struct dwc2_hsotg *hsotg) 


		s3c_hsotg_phy_disable(hsotg);



	if (hsotg->driver) {

		int ep;

		for (ep = 0; ep < hsotg->num_of_eps; ep++)

			s3c_hsotg_ep_disable(&hsotg->eps[ep].ep);
@@ -3627,15 +3632,15 @@ int s3c_hsotg_resume(struct dwc2_hsotg *hsotg) 
		clk_enable(hsotg->clk);

		ret = regulator_bulk_enable(ARRAY_SIZE(hsotg->supplies),

					    hsotg->supplies);

	}



		s3c_hsotg_phy_enable(hsotg);



		spin_lock_irqsave(&hsotg->lock, flags);

		s3c_hsotg_core_init_disconnected(hsotg);

		if (hsotg->enabled)

			s3c_hsotg_core_connect(hsotg);

		spin_unlock_irqrestore(&hsotg->lock, flags);



	}

	mutex_unlock(&hsotg->init_mutex);



	return ret;