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Date:   Thu, 15 Apr 2021 09:40:48 +0400
Message-Id: <7ad62c0aa1831d810a8fefdfe0d417f52c4d8421.1618464534.git.Arthur.Petrosyan@synopsys.com>
In-Reply-To: <cover.1618464534.git.Arthur.Petrosyan@synopsys.com>
References: <cover.1618464534.git.Arthur.Petrosyan@synopsys.com>
From:   Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Subject: [PATCH 11/15] usb: dwc2: Add hibernation entering flow by system suspend
To:     Felipe Balbi <balbi@kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
        linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     John Youn <John.Youn@synopsys.com>,
        Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Precedence: bulk

Adds a new flow of entering hibernation when PC is
hibernated or suspended.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
---
 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 3b03b2d73aaa..db8eb1940d17 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4387,6 +4387,16 @@ static int _dwc2_hcd_suspend(struct usb_hcd *hcd)
 		clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
 		break;
 	case DWC2_POWER_DOWN_PARAM_HIBERNATION:
+		/* Enter hibernation */
+		spin_unlock_irqrestore(&hsotg->lock, flags);
+		ret = dwc2_enter_hibernation(hsotg, 1);
+		if (ret)
+			dev_err(hsotg->dev, "enter hibernation failed\n");
+		spin_lock_irqsave(&hsotg->lock, flags);
+
+		/* After entering suspend, hardware is not accessible */
+		clear_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