linux-kernel - [PATCH v2 12/15] usb: dwc2: Add hibernation exiting flow by system resume

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Message-Id: <20210416124819.A3B26A005C@mailhost.synopsys.com>
Date:   Fri, 16 Apr 2021 16:48:18 +0400
From:   Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Minas Harutyunyan <Minas.Harutyunyan@...opsys.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     John Youn <John.Youn@...opsys.com>,
        Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
Subject: [PATCH v2 12/15] usb: dwc2: Add hibernation exiting flow by system resume

Adds a new flow of exiting hibernation when PC is resumed
from suspend state.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@...opsys.com>
---
 Changes in v2:
 - None

 drivers/usb/dwc2/hcd.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 92848629cc61..035d4911a3c3 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4470,6 +4470,16 @@ static int _dwc2_hcd_resume(struct usb_hcd *hcd)
 		set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 		break;
 	case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+		ret = dwc2_exit_hibernation(hsotg, 0, 0, 1);
+		if (ret)
+			dev_err(hsotg->dev, "exit hibernation failed.\n");
+
+		/*
+		 * Set HW accessible bit before powering on the controller
+		 * since an interrupt may rise.
+		 */
+		set_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+		break;
 	case DWC2_POWER_DOWN_PARAM_NONE:
 		/*
 		 * If not hibernation nor partial power down are supported,
-- 
2.25.1