From: Felipe Balbi <balbi@ti.com>
Date: Wed, 25 Feb 2015 20:30:55 +0000 (-0600)
Subject: usb: musb: core: remove unnecessary reg access from resume IRQ
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=46571889ec435f1bf29d9094f062948b26630723;p=openwrt%2Fstaging%2Fblogic.git

usb: musb: core: remove unnecessary reg access from resume IRQ

when musb is operating as host and a remote wakeup
fires up, a resume interrupt will be raised. At that
point SUSPENDM bit is automatically cleared and
RESUME bit is automatically set.

Remove those two from IRQ handler.

Tested-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---

diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c
index b5dfe83dce76..3fb7d6e032f1 100644
--- a/drivers/usb/musb/musb_core.c
+++ b/drivers/usb/musb/musb_core.c
@@ -538,27 +538,12 @@ static irqreturn_t musb_stage0_irq(struct musb *musb, u8 int_usb,
 				usb_otg_state_string(musb->xceiv->otg->state));
 
 		if (devctl & MUSB_DEVCTL_HM) {
-			void __iomem *mbase = musb->mregs;
-			u8 power;
-
 			switch (musb->xceiv->otg->state) {
 			case OTG_STATE_A_SUSPEND:
 				/* remote wakeup?  later, GetPortStatus
 				 * will stop RESUME signaling
 				 */
 
-				power = musb_readb(musb->mregs, MUSB_POWER);
-				if (power & MUSB_POWER_SUSPENDM) {
-					/* spurious */
-					musb->int_usb &= ~MUSB_INTR_SUSPEND;
-					dev_dbg(musb->controller, "Spurious SUSPENDM\n");
-					break;
-				}
-
-				power &= ~MUSB_POWER_SUSPENDM;
-				musb_writeb(mbase, MUSB_POWER,
-						power | MUSB_POWER_RESUME);
-
 				musb->port1_status |=
 						(USB_PORT_STAT_C_SUSPEND << 16)
 						| MUSB_PORT_STAT_RESUME;