[U-Boot] [PATCH 14/14] drivers:usb:xhci:fsl: Implement Erratum A-010151 for FSL USB3 controller

[yinbo.zhu]

From: Sriram Dash <sriram.dash at nxp.com>

Currently the controller by default enables the Receive Detect feature in P3
mode in USB 3.0 PHY. However, USB 3.0 PHY does not reliably support receive
detection in P3 mode.
Enabling the USB3 controller to configure USB in P2 mode whenever the Receive
Detect feature is required.

Signed-off-by: Sriram Dash <sriram.dash at nxp.com>
Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
Signed-off-by: yinbo.zhu <yinbo.zhu at nxp.com>
---
 drivers/usb/host/xhci-dwc3.c | 5 +++++
 drivers/usb/host/xhci-fsl.c  | 7 +++++++
 include/linux/usb/dwc3.h     | 1 +
 3 files changed, 13 insertions(+)

diff --git a/drivers/usb/host/xhci-dwc3.c b/drivers/usb/host/xhci-dwc3.c
index 33961cd..adbd9b5 100644
--- a/drivers/usb/host/xhci-dwc3.c
+++ b/drivers/usb/host/xhci-dwc3.c
@@ -97,3 +97,8 @@ void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
 	setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
 			GFLADJ_30MHZ(val));
 }
+
+void dwc3_set_rxdetect_power_mode(struct dwc3 *dwc3_reg, u32 val)
+{
+	setbits_le32(&dwc3_reg->g_usb3pipectl[0], val);
+}
diff --git a/drivers/usb/host/xhci-fsl.c b/drivers/usb/host/xhci-fsl.c
index 3a16624..e8e90fa 100644
--- a/drivers/usb/host/xhci-fsl.c
+++ b/drivers/usb/host/xhci-fsl.c
@@ -86,6 +86,13 @@ static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci)
 	fsl_xhci_set_beat_burst_length(fsl_xhci->dwc3_reg);
 
 	/*
+	* A-010151: USB controller to configure USB in P2 mode
+	* whenever the Receive Detect feature is required
+	*/
+	dwc3_set_rxdetect_power_mode(fsl_xhci->dwc3_reg,
+				     DWC3_GUSB3PIPECTL_DISRXDETP3);
+
+	/*
 	 * A-010151: The dwc3 phy TSMC 28-nm HPM 0.9/1.8 V does not
 	 * reliably support Rx Detect in P3 mode(P3 is the default
 	 * setting). Therefore, some USB3.0 devices may not be detected
diff --git a/include/linux/usb/dwc3.h b/include/linux/usb/dwc3.h
index c1b23b2..873b4db 100644
--- a/include/linux/usb/dwc3.h
+++ b/include/linux/usb/dwc3.h
@@ -220,5 +220,6 @@ void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode);
 void dwc3_core_soft_reset(struct dwc3 *dwc3_reg);
 int dwc3_core_init(struct dwc3 *dwc3_reg);
 void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val);
+void dwc3_set_rxdetect_power_mode(struct dwc3 *dwc3_reg, u32 val);
 #endif
 #endif /* __DWC3_H_ */
-- 
2.1.0.27.g96db324