usb peripheral 驱动 - cable connect/disconnect

PD 在 APPS： PD ==> dwc3
PD 在 ADSP： PD ==> ucsi ==> dwc3

1. usb cable disconnect

代码流程：

== dwc3_msm_vbus_notifier();
	queue_work(mdwc->dwc3_wq, &mdwc->resume_work);
	== dwc3_resume_work();
		== dwc3_ext_event_notify();
			queue_delayed_work(mdwc->sm_usb_wq, &mdwc->sm_work, 0);
			== dwc3_otg_sm_work();
				== dwc3_otg_start_peripheral(mdwc, 0);		// case DRD_STATE_PERIPHERA
					== usb_gadget_vbus_disconnect(&dwc->gadget);
						== dwc3_gadget_vbus_session();
							== dwc3_gadget_run_stop(dwc, 0, false);
								== dwc3_gadget_disable_irq(dwc);
								== __dwc3_gadget_ep_disable();
								== dwc3_stop_active_transfers(dwc);
						== usb_phy_notify_disconnect();
						== dwc3_usb3_phy_suspend();
				== pm_runtime_put_sync_suspend(mdwc->dev);
					== dwc3_msm_runtime_suspend();
						== dwc3_msm_suspend();
							queue_delayed_work(mdwc->sm_usb_wq, &mdwc->sm_work, 0);
							== dwc3_otg_sm_work();
								== dwc3_msm_gadget_vbus_draw(mdwc, 0);		// case DRD_STATE_IDLE

ipc log：

console:/ #cat /sys/kernel/debug/ipc_logging/a600000.dwc3/log 
[   405.795877897 ] FF extcon idx                   0 ?			// extcon ctrl
[   405.797294095 ] FF peripheral                   0 ?			// usb 拔出前的模式
[   405.797326074 ] FF StrtGdgt gsync               2 ?			// dwc3_otg_start_peripheral
[   405.797381647 ] FF VbusSess                     0 ?
[   405.797398522 ] FF run_stop                     0 ?
[   405.797404512 ] FF MaskINT                      0 ?
[   405.797414199 ] dwc3_remove_requests: START for ep0out(0)
[   405.797418209 ] dwc3_remove_requests: DONE for ep0out(0)
[   405.797630553 ] dwc3_stop_active_transfers: DONE
[   405.797636334 ] dwc3_gadget_run_stop: remaining EVNTCOUNT(0)=16
[   405.797654720 ] dwc3_msm_notify_event: remaining EVNTCOUNT(1)=0
[   405.797669928 ] FF DISCONNECT INT               0 ?			// dwc3_gadget_disconnect_interrupt
[   405.797689147 ] FF DISCONNECT                   0 ?
[   405.798761647 ] FF StopGdgt psync               1 ?			// dwc3_otg_start_peripheral
[   405.798788730 ] FF RT Sus                       0 ?			// dwc3_msm_runtime_suspend
[   405.799793730 ] FF bus_vote_start               0 ?
[   405.803440605 ] FF bus_vote_end                 0 ?
[   405.803487116 ] FF Ctl Sus                      1 ?			// dwc3_msm_suspend
[   405.803566126 ] FF !BSV psync                   0 ?
[   405.803687480 ] FF idle                         0 ?
[   407.924288164 ] FF PM Sus                       0 ?			// dwc3_msm_pm_suspend 系统休眠调用

dmesg log：

console:/ # dmesg -c
[  405.795638] usbpd usbpd0: USB Type-C disconnect		// usb/pd/policy_engine 通知
[  405.795898] msm-dwc3 a600000.ssusb: vbus:0 event received	// dwc3_msm_vbus_notifier(vbus event表示作为peripheral)
[  405.797144] msm-dwc3 a600000.ssusb: dwc3_resume_work: dwc3 resume work
[  405.797167] msm-dwc3 a600000.ssusb: XCVR: ID set
[  405.797178] msm-dwc3 a600000.ssusb: XCVR: BSV clear
[  405.797188] msm-dwc3 a600000.ssusb: XCVR: SUSP clear
[  405.797285] msm-dwc3 a600000.ssusb: peripheral state
[  405.797308] msm-dwc3 a600000.ssusb: !id || !bsv
[  405.797336] msm-dwc3 a600000.ssusb: dwc3_otg_start_peripheral: turn off gadget dwc3-gadget
[  405.797646] msm-dwc3 a600000.ssusb: DWC3_GSI_EVT_BUF_CLEAR
[  405.797662] msm-dwc3 a600000.ssusb: msm_dwc3_pwr_irq received
[  405.797672] msm-dwc3 a600000.ssusb: dwc3_pwr_event_handler irq_stat=28000C
[  405.797677] msm-dwc3 a600000.ssusb: DWC3_CONTROLLER_NOTIFY_OTG_EVENT received
[  405.797680] msm-dwc3 a600000.ssusb: dwc3_pwr_event_handler link state = 0x0004
[  405.797686] msm-dwc3 a600000.ssusb: dwc3_pwr_event_handler: unexpected PWR_EVNT, irq_stat=280000
[  405.797748] diag: USB channel diag: Received Disconnect event
[  405.798498] android_work: sent uevent USB_STATE=DISCONNECTED
[  405.798782] msm-dwc3 a600000.ssusb: DWC3-msm runtime suspend		// dwc3_msm_runtime_suspend
[  405.799543] msm-dwc3 a600000.ssusb: dwc3_msm_suspend: power collapse
[  405.799787] msm-dwc3 a600000.ssusb: IOMMU detached
[  405.803477] msm-dwc3 a600000.ssusb: DWC3 in low power mode
[  405.803594] msm-dwc3 a600000.ssusb: idle state
[  405.803701] msm-dwc3 a600000.ssusb: Cable disconnected