linux-kernel - [PATCH] usb: dwc3: add disable receiver detection in P3 quirk

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Date:	Mon, 14 Mar 2016 09:59:53 +0530
From:	Rajesh Bhagat <rajesh.bhagat@....com>
To:	<balbi@...com>
CC:	<gregkh@...uxfoundation.org>, <linux-usb@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<sriram.dash@....com>, Rajesh Bhagat <rajesh.bhagat@....com>
Subject: [PATCH] usb: dwc3: add disable receiver detection in P3 quirk

Some freescale QorIQ platforms require to disable receiver detection
in P3 for correct detection of USB devices. If GUSB3PIPECTL(DISRXDETINP3)
is set, Core will change PHY power state to P2 and then perform receiver 
detection. After receiver detection, Core will change PHY power state to 
P3. Same quirk would be added in dts file in future patches. 

Signed-off-by: Sriram Dash <sriram.dash@....com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat@....com>
---
 drivers/usb/dwc3/core.c          |    6 ++++++
 drivers/usb/dwc3/core.h          |    2 ++
 drivers/usb/dwc3/platform_data.h |    1 +
 3 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index de5e01f..b2f2b08 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -446,6 +446,9 @@ static int dwc3_phy_setup(struct dwc3 *dwc)
 	if (dwc->u2ss_inp3_quirk)
 		reg |= DWC3_GUSB3PIPECTL_U2SSINP3OK;
 
+	if (dwc->dis_rxdet_inp3_quirk)
+		reg |= DWC3_GUSB3PIPECTL_DISRXDETINP3;
+
 	if (dwc->req_p1p2p3_quirk)
 		reg |= DWC3_GUSB3PIPECTL_REQP1P2P3;
 
@@ -903,6 +906,8 @@ static int dwc3_probe(struct platform_device *pdev)
 				"snps,u2exit_lfps_quirk");
 	dwc->u2ss_inp3_quirk = device_property_read_bool(dev,
 				"snps,u2ss_inp3_quirk");
+	dwc->dis_rxdet_inp3_quirk = device_property_read_bool(dev,
+				"snps,dis_rxdet_inp3_quirk");
 	dwc->req_p1p2p3_quirk = device_property_read_bool(dev,
 				"snps,req_p1p2p3_quirk");
 	dwc->del_p1p2p3_quirk = device_property_read_bool(dev,
@@ -945,6 +950,7 @@ static int dwc3_probe(struct platform_device *pdev)
 		dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
 		dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;
 		dwc->u2ss_inp3_quirk = pdata->u2ss_inp3_quirk;
+		dwc->dis_rxdet_inp3_quirk = pdata->dis_rxdet_inp3_quirk;
 		dwc->req_p1p2p3_quirk = pdata->req_p1p2p3_quirk;
 		dwc->del_p1p2p3_quirk = pdata->del_p1p2p3_quirk;
 		dwc->del_phy_power_chg_quirk = pdata->del_phy_power_chg_quirk;
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index e4f8b90..41cc22c 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -193,6 +193,7 @@
 /* Global USB3 PIPE Control Register */
 #define DWC3_GUSB3PIPECTL_PHYSOFTRST	(1 << 31)
 #define DWC3_GUSB3PIPECTL_U2SSINP3OK	(1 << 29)
+#define DWC3_GUSB3PIPECTL_DISRXDETINP3	(1 << 28)
 #define DWC3_GUSB3PIPECTL_REQP1P2P3	(1 << 24)
 #define DWC3_GUSB3PIPECTL_DEP1P2P3(n)	((n) << 19)
 #define DWC3_GUSB3PIPECTL_DEP1P2P3_MASK	DWC3_GUSB3PIPECTL_DEP1P2P3(7)
@@ -873,6 +874,7 @@ struct dwc3 {
 
 	unsigned		tx_de_emphasis_quirk:1;
 	unsigned		tx_de_emphasis:2;
+	unsigned		dis_rxdet_inp3_quirk:1;
 };
 
 /* -------------------------------------------------------------------------- */
diff --git a/drivers/usb/dwc3/platform_data.h b/drivers/usb/dwc3/platform_data.h
index 2bb4d3a..9df1dfb 100644
--- a/drivers/usb/dwc3/platform_data.h
+++ b/drivers/usb/dwc3/platform_data.h
@@ -46,6 +46,7 @@ struct dwc3_platform_data {
 
 	unsigned tx_de_emphasis_quirk:1;
 	unsigned tx_de_emphasis:2;
+	unsigned dis_rxdet_inp3_quirk:1;
 
 	u32 fladj_value;
 
-- 
1.7.7.4