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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Felipe Balbi <felipe.balbi@linux.intel.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.9 066/241] usb: dwc3: make sure UX_EXIT_PX is cleared
Date:   Mon, 19 Mar 2018 19:05:31 +0100
Message-Id: <20180319180753.935840605@linuxfoundation.org>
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4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Felipe Balbi <felipe.balbi@linux.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@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/dwc3/core.c |    6 ++++++
 drivers/usb/dwc3/core.h |    1 +
 2 files changed, 7 insertions(+)

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -464,6 +464,12 @@ static int dwc3_phy_setup(struct dwc3 *d
 	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
 	 * will be '0' when the core is reset. Application needs to set it
--- 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)