linux-kernel - [ 11/77] usb: dwc3: Enable usb2 LPM only when connected as usb2.0

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Date:	Fri,  1 Mar 2013 11:43:56 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Paul Zimmerman <paulz@...opsys.com>,
	Pratyush Anand <pratyush.anand@...com>,
	Felipe Balbi <balbi@...com>
Subject: [ 11/77] usb: dwc3: Enable usb2 LPM only when connected as usb2.0

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

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

From: Pratyush Anand <pratyush.anand@...com>

commit 2b758350af19db9a5c98241cf222c2e211d7a912 upstream.

Synopsys says:
The HIRD Threshold field must be set to ‘0’ when the device core is
operating in super speed mode.

This patch implements above statement.

Acked-by: Paul Zimmerman <paulz@...opsys.com>
Signed-off-by: Pratyush Anand <pratyush.anand@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/dwc3/gadget.c |   31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2157,6 +2157,23 @@ static void dwc3_gadget_conndone_interru
 		break;
 	}
 
+	/* Enable USB2 LPM Capability */
+
+	if ((dwc->revision > DWC3_REVISION_194A)
+			&& (speed != DWC3_DCFG_SUPERSPEED)) {
+		reg = dwc3_readl(dwc->regs, DWC3_DCFG);
+		reg |= DWC3_DCFG_LPM_CAP;
+		dwc3_writel(dwc->regs, DWC3_DCFG, reg);
+
+		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
+		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
+
+		/* TODO: This should be configurable */
+		reg |= DWC3_DCTL_HIRD_THRES(28);
+
+		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+	}
+
 	/* Recent versions support automatic phy suspend and don't need this */
 	if (dwc->revision < DWC3_REVISION_194A) {
 		/* Suspend unneeded PHY */
@@ -2463,20 +2480,8 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 			DWC3_DEVTEN_DISCONNEVTEN);
 	dwc3_writel(dwc->regs, DWC3_DEVTEN, reg);
 
-	/* Enable USB2 LPM and automatic phy suspend only on recent versions */
+	/* automatic phy suspend only on recent versions */
 	if (dwc->revision >= DWC3_REVISION_194A) {
-		reg = dwc3_readl(dwc->regs, DWC3_DCFG);
-		reg |= DWC3_DCFG_LPM_CAP;
-		dwc3_writel(dwc->regs, DWC3_DCFG, reg);
-
-		reg = dwc3_readl(dwc->regs, DWC3_DCTL);
-		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);
-
-		/* TODO: This should be configurable */
-		reg |= DWC3_DCTL_HIRD_THRES(28);
-
-		dwc3_writel(dwc->regs, DWC3_DCTL, reg);
-
 		dwc3_gadget_usb2_phy_suspend(dwc, false);
 		dwc3_gadget_usb3_phy_suspend(dwc, false);
 	}


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