diff mbox series

[v3,09/14] usb: dwc2: Add part. power down exit from dwc2_conn_id_status_change().

Message ID 20210408094534.4AA7AA022E@mailhost.synopsys.com (mailing list archive)
State Accepted
Commit 4d4d99afa2b0fc53dc55f0c3ed215cdecd1197c5
Headers show
Series usb: dwc2: Fix Partial Power down issues. | expand

Commit Message

Artur Petrosyan April 8, 2021, 9:45 a.m. UTC 
Before changing to connector B exiting from Partial
Power Down is required.

- Added exiting from Partial Power Down mode when
  connector ID status changes to "connId B".
  Because if connector ID status changed to B connector
  while core was in partial power down mode, HANG would
  accrue from a soft reset.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Acked-by: Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>
---
 drivers/usb/dwc2/hcd.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 7c7496719152..9529e9839961 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -3206,6 +3206,15 @@  static void dwc2_conn_id_status_change(struct work_struct *work)
 		if (count > 250)
 			dev_err(hsotg->dev,
 				"Connection id status change timed out\n");
+
+		/*
+		 * Exit Partial Power Down without restoring registers.
+		 * No need to check the return value as registers
+		 * are not being restored.
+		 */
+		if (hsotg->in_ppd && hsotg->lx_state == DWC2_L2)
+			dwc2_exit_partial_power_down(hsotg, 0, false);
+
 		hsotg->op_state = OTG_STATE_B_PERIPHERAL;
 		dwc2_core_init(hsotg, false);
 		dwc2_enable_global_interrupts(hsotg);