From: Sriram Dash sriram.dash@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@nxp.com Signed-off-by: Rajesh Bhagat rajesh.bhagat@nxp.com Signed-off-by: yinbo.zhu yinbo.zhu@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..ffb2242 100644 --- a/drivers/usb/host/xhci-fsl.c +++ b/drivers/usb/host/xhci-fsl.c @@ -85,6 +85,13 @@ static int fsl_xhci_core_init(struct fsl_xhci *fsl_xhci) /* Change beat burst and outstanding pipelined transfers requests */ 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 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_ */