linux-kernel - [PATCH V3 5/6] USB: OHCI: Properly handle ohci-exynos suspend

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Date:	Fri, 18 Oct 2013 16:36:15 +0530
From:	Majunath Goudar <csmanjuvijay@...il.com>
To:	csmanjuvijay@...il.com
Cc:	Arnd Bergmann <arnd@...db.de>, Greg KH <greg@...ah.com>,
	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 V3 5/6] USB: OHCI: Properly handle ohci-exynos suspend

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

Calling explicitly the ohci_suspend() routine in
exynos_ohci_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: Arnd Bergmann <arnd@...db.de>
Cc: Greg KH <greg@...ah.com>
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
---
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-exynos 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-exynos.c |   22 ++++++----------------
 1 file changed, 6 insertions(+), 16 deletions(-)

diff --git a/drivers/usb/host/ohci-exynos.c b/drivers/usb/host/ohci-exynos.c
index a87baed..4b5c8bd 100644
--- a/drivers/usb/host/ohci-exynos.c
+++ b/drivers/usb/host/ohci-exynos.c
@@ -192,23 +192,14 @@ static int exynos_ohci_suspend(struct device *dev)
 	struct exynos_ohci_hcd *exynos_ohci = to_exynos_ohci(hcd);
 	struct ohci_hcd *ohci = hcd_to_ohci(hcd);
 	struct platform_device *pdev = to_platform_device(dev);
+	bool do_wakeup = device_may_wakeup(dev);
 	unsigned long flags;
-	int rc = 0;
+	int rc = ohci_suspend(hcd, do_wakeup);
 
-	/*
-	 * 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 &&
-			ohci->rh_state != OHCI_RH_HALTED) {
-		rc = -EINVAL;
-		goto fail;
-	}
+	if (rc)
+		return rc;
 
-	clear_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags);
+	spin_lock_irqsave(&ohci->lock, flags);
 
 	if (exynos_ohci->otg)
 		exynos_ohci->otg->set_host(exynos_ohci->otg, &hcd->self);
@@ -217,10 +208,9 @@ static int exynos_ohci_suspend(struct device *dev)
 
 	clk_disable_unprepare(exynos_ohci->clk);
 
-fail:
 	spin_unlock_irqrestore(&ohci->lock, flags);
 
-	return rc;
+	return 0;
 }
 
 static int exynos_ohci_resume(struct device *dev)
-- 
1.7.9.5

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