linux-kernel - [PATCH] USB: ohci: da8xx: Balance ochi_disable with ohci

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Message-Id: <20161123183202.9246-1-ahaslam@baylibre.com>
Date:   Wed, 23 Nov 2016 19:32:02 +0100
From:   Axel Haslam <ahaslam@...libre.com>
To:     gregkh@...uxfoundation.org, nsekhar@...com, khilman@...libre.com,
        david@...hnology.com, ptitiano@...libre.com
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        Axel Haslam <ahaslam@...libre.com>
Subject: [PATCH] USB: ohci: da8xx: Balance ochi_disable with ohci_enable in resume.

On resume from suspend a failure with -ESHUTDOWN is returned
from ohci_bus_resume, and the usb is inoperable.

This happens because ohci_suspend disables the master interrupt
and sets an hcd flag to say that the hw is no longer accessible.

Calling ohci_resume reverts the steps taken on ohci_suspend
and flags the HW as "accessible" again, resume completes
successfully and usb is working after a suspend/resume sequence.

While we are here, remove setting device power_state,
as this is no longer needed and scheduled for removal.

Signed-off-by: Axel Haslam <ahaslam@...libre.com>
---
 drivers/usb/host/ohci-da8xx.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/usb/host/ohci-da8xx.c b/drivers/usb/host/ohci-da8xx.c
index b3de8bc..a598bd8 100644
--- a/drivers/usb/host/ohci-da8xx.c
+++ b/drivers/usb/host/ohci-da8xx.c
@@ -340,8 +340,7 @@ static int ohci_da8xx_resume(struct platform_device *dev)
 	if (ret)
 		return ret;

-	dev->dev.power.power_state = PMSG_ON;
-	usb_hcd_resume_root_hub(hcd);
+	ohci_resume(hcd, false);

 	return 0;
 }
-- 
2.9.3