linux-kernel - [PATCH AUTOSEL for 4.9 068/219] usb: dwc3: make sure UX_EXIT

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Date:   Sat, 3 Mar 2018 22:28:35 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.9 068/219] usb: dwc3: make sure UX_EXIT_PX is
 cleared

From: Felipe Balbi <felipe.balbi@...ux.intel.com>

[ Upstream commit 1966b8657d058ecb95031809b607bf3fd1e01c10 ]

This bit is only supposed to be used with known
buggy PHYs, however some platforms might erroneously
set it. In order to avoid it, let's make sure this
bit is always cleared. If some PHY needs this, we
will need to add a quirk flag.

Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/usb/dwc3/core.c | 6 ++++++
 drivers/usb/dwc3/core.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fea446900cad..a0c2b8b6edd0 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -463,6 +463,12 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 
 	reg = dwc3_readl(dwc->regs, DWC3_GUSB3PIPECTL(0));
 
+	/*
+	 * Make sure UX_EXIT_PX is cleared as that causes issues with some
+	 * PHYs. Also, this bit is not supposed to be used in normal operation.
+	 */
+	reg &= ~DWC3_GUSB3PIPECTL_UX_EXIT_PX;
+
 	/*
 	 * Above 1.94a, it is recommended to set DWC3_GUSB3PIPECTL_SUSPHY
 	 * to '0' during coreConsultant configuration. So default value
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 884c43714456..bc3678e9dcb1 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -223,6 +223,7 @@
 #define DWC3_GUSB3PIPECTL_PHYSOFTRST	(1 << 31)
 #define DWC3_GUSB3PIPECTL_U2SSINP3OK	(1 << 29)
 #define DWC3_GUSB3PIPECTL_DISRXDETINP3	(1 << 28)
+#define DWC3_GUSB3PIPECTL_UX_EXIT_PX	(1 << 27)
 #define DWC3_GUSB3PIPECTL_REQP1P2P3	(1 << 24)
 #define DWC3_GUSB3PIPECTL_DEP1P2P3(n)	((n) << 19)
 #define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK	DWC3_GUSB3PIPECTL_DEP1P2P3(7)
-- 
2.14.1