linux-kernel - [ 54/68] usb: gadget: pch_udc: Reduce redundant interrupt

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Message-Id: <20120419210823.250456008@linuxfoundation.org>
Date:	Thu, 19 Apr 2012 14:09:12 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Tomoya MORINAGA <tomoya.rohm@...il.com>,
	Felipe Balbi <balbi@...com>
Subject: [ 54/68] usb: gadget: pch_udc: Reduce redundant interrupt

3.2-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tomoya MORINAGA <tomoya.rohm@...il.com>

commit 833310402c54ad9b676b465fc53ad276b13d36be upstream.

ISSUE:
USB Suspend interrupts occur frequently.

CAUSE:
When it is called pch_udc_reconnect() in USB Suspend, it repeats reset and
Suspend.

SOLUTION:
pch_udc_reconnect() does not enable all interrupts.  When an enumeration event
occurred the driver enables all interrupts.

Signed-off-by: Tomoya MORINAGA <tomoya.rohm@...il.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/gadget/pch_udc.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/usb/gadget/pch_udc.c
+++ b/drivers/usb/gadget/pch_udc.c
@@ -568,9 +568,7 @@ static void pch_udc_reconnect(struct pch
 	/* enable device interrupts */
 	/* pch_udc_enable_interrupts() */
 	pch_udc_bit_clr(dev, UDC_DEVIRQMSK_ADDR,
-			UDC_DEVINT_UR | UDC_DEVINT_US |
-			UDC_DEVINT_ENUM |
-			UDC_DEVINT_SI | UDC_DEVINT_SC);
+			UDC_DEVINT_UR | UDC_DEVINT_ENUM);
 
 	/* Clear the disconnect */
 	pch_udc_bit_set(dev, UDC_DEVCTL_ADDR, UDC_DEVCTL_RES);
@@ -2419,6 +2417,11 @@ static void pch_udc_svc_enum_interrupt(s
 	pch_udc_set_dma(dev, DMA_DIR_TX);
 	pch_udc_set_dma(dev, DMA_DIR_RX);
 	pch_udc_ep_set_rrdy(&(dev->ep[UDC_EP0OUT_IDX]));
+
+	/* enable device interrupts */
+	pch_udc_enable_interrupts(dev, UDC_DEVINT_UR | UDC_DEVINT_US |
+					UDC_DEVINT_ES | UDC_DEVINT_ENUM |
+					UDC_DEVINT_SI | UDC_DEVINT_SC);
 }
 
 /**


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