linux-kernel - [PATCH V4 3/6] USB: OHCI: Properly handle ohci-s3c2410 suspend

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Message-Id: <1382365136-24472-4-git-send-email-csmanjuvijay@gmail.com>
Date:	Mon, 21 Oct 2013 19:48:53 +0530
From:	Majunath Goudar <csmanjuvijay@...il.com>
To:	csmanjuvijay@...il.com
Cc:	Greg KH <greg@...ah.com>, Ben Dooks <ben-linux@...ff.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org
Subject: [PATCH V4 3/6]  USB: OHCI: Properly handle ohci-s3c2410 suspend

Suspend scenario in case of ohci-s3c2410 glue was not
properly handled as it was not suspending generic part
of ohci controller. Alan Stern suggested, properly handle
ohci-s3c2410 suspend scenario.

Calling explicitly the ohci_suspend()
routine in ohci_hcd_s3c2410_drv_suspend() will ensure
proper handling of suspend scenario.

Signed-off-by: Manjunath Goudar <csmanjuvijay@...il.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Cc: Greg KH <greg@...ah.com>
Cc: Ben Dooks <ben-linux@...ff.org>
Cc: Kukjin Kim <kgene.kim@...sung.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-samsung-soc@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
Cc: linux-usb@...r.kernel.org
---
V3->V4:
      -No changes, only added Alan Acked-by.

V2->V3:
      -No changes.
      As a build failure on "ep93xx proper suspend patch" and Linaro
      id bounced. Rewrote this patch on top of latest Greg usb-next
      branch. This patch not gives any build error. Patch is required
      for ohci-s3c2410 proper suspending as Alan mentioned.

      Initially when I wrote this patch I was working in Linaro, now
      I am not part of Linaro that is why Linaro id is bouncing. Sending
      this patch from personal mail id.

V1->V2:
      -No changes.
       Due to the build failure on ep93xx reverted this patch.
       This patch is needed as Alan Stern suggestion.

 drivers/usb/host/ohci-s3c2410.c |   21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index be3429e..b5bf9b7 100644
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -426,28 +426,15 @@ static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
 static int ohci_hcd_s3c2410_drv_suspend(struct device *dev)
 {
 	struct usb_hcd *hcd = dev_get_drvdata(dev);
-	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 	struct platform_device *pdev = to_platform_device(dev);
-	unsigned long flags;
+	bool do_wakeup = device_may_wakeup(dev);
 	int rc = 0;
 
-	/*
-	 * Root hub was already suspended. Disable irq emission and
-	 * mark HW unaccessible, bail out if RH has been resumed. Use
-	 * the spinlock to properly synchronize with possible pending
-	 * RH suspend or resume activity.
-	 */
-	spin_lock_irqsave(&ohci->lock, flags);
-	if (ohci->rh_state != OHCI_RH_SUSPENDED) {
-		rc = -EINVAL;
-		goto bail;
-	}
-
-	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	rc = ohci_suspend(hcd, do_wakeup);
+	if (rc)
+		return rc;
 
 	s3c2410_stop_hc(pdev);
-bail:
-	spin_unlock_irqrestore(&ohci->lock, flags);
 
 	return rc;
 }
-- 
1.7.9.5

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