From 18b2b37c59e1bcd5a61716731ec5549fb5bb0203 Mon Sep 17 00:00:00 2001 From: Gregory Herrero Date: Wed, 29 Apr 2015 22:09:09 +0200 Subject: [PATCH] usb: dwc2: gadget: powerup controller if needed During vbus session, usb controller needs to exit hibernation if it was previously in suspend state. Since controller will be resetted and configured, there is no need to restore registers. Moreover, set lx_state to L0 on B session. vbus_session callback may not be used by all platforms. Thus, controller software state needs to be set to L0 if the controller detects a valid B session. Otherwise, lx_state will remain L2 and prevent any request submission. Acked-by: John Youn Signed-off-by: Gregory Herrero Signed-off-by: Felipe Balbi --- drivers/usb/dwc2/gadget.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 732761f..56a08ac 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -2515,6 +2515,7 @@ irq_retry: kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET); + hsotg->lx_state = DWC2_L0; s3c_hsotg_core_init_disconnected(hsotg, true); } } @@ -3205,6 +3206,14 @@ static int s3c_hsotg_vbus_session(struct usb_gadget *gadget, int is_active) spin_lock_irqsave(&hsotg->lock, flags); if (is_active) { + /* + * If controller is hibernated, it must exit from hibernation + * before being initialized + */ + if (hsotg->lx_state == DWC2_L2) { + dwc2_exit_hibernation(hsotg, false); + hsotg->lx_state = DWC2_L0; + } /* Kill any ep0 requests as controller will be reinitialized */ kill_all_requests(hsotg, hsotg->eps_out[0], -ECONNRESET); s3c_hsotg_core_init_disconnected(hsotg, false); -- 2.7.4