usb: dwc3: gadget: Track connected SSP rate and lane count

Track the number of connected lanes and speed in corresponding enum
usb_ssp_rate for SuperSpeed Plus capable device.
Signed-off-by: NThinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/2389592188d2e37a2ee45edaf04d942b19f3af82.1611106162.git.Thinh.Nguyen@synopsys.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/dwc3/core.h

@@ -461,6 +461,8 @@
 #define DWC3_DEVTEN_USBRSTEN		BIT(1)
 #define DWC3_DEVTEN_DISCONNEVTEN	BIT(0)
 
+#define DWC3_DSTS_CONNLANES(n)		(((n) >> 30) & 0x3) /* DWC_usb32 only */
+
 /* Device Status Register */
 #define DWC3_DSTS_DCNRD			BIT(29)
 

drivers/usb/dwc3/gadget.c

@@ -2120,6 +2120,12 @@ static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
 				reg |= DWC3_DCFG_SUPERSPEED_PLUS;
 		}
 	}
+
+	if (DWC3_IP_IS(DWC32) &&
+	    dwc->gadget_max_speed > USB_SPEED_UNKNOWN &&
+	    dwc->gadget_max_speed < USB_SPEED_SUPER_PLUS)
+		reg &= ~DWC3_DCFG_NUMLANES(~0);
+
 	dwc3_writel(dwc->regs, DWC3_DCFG, reg);
 }
 
@@ -3369,12 +3375,18 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 	struct dwc3_ep		*dep;
 	int			ret;
 	u32			reg;
+	u8			lanes = 1;
 	u8			speed;
 
 	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 	speed = reg & DWC3_DSTS_CONNECTSPD;
 	dwc->speed = speed;
 
+	if (DWC3_IP_IS(DWC32))
+		lanes = DWC3_DSTS_CONNLANES(reg) + 1;
+
+	dwc->gadget->ssp_rate = USB_SSP_GEN_UNKNOWN;
+
 	/*
 	 * RAMClkSel is reset to 0 after USB reset, so it must be reprogrammed
 	 * each time on Connect Done.
@@ -3389,6 +3401,11 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
 		dwc->gadget->ep0->maxpacket = 512;
 		dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
+
+		if (lanes > 1)
+			dwc->gadget->ssp_rate = USB_SSP_GEN_2x2;
+		else
+			dwc->gadget->ssp_rate = USB_SSP_GEN_2x1;
 		break;
 	case DWC3_DSTS_SUPERSPEED:
 		/*
@@ -3410,6 +3427,11 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc)
 		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(512);
 		dwc->gadget->ep0->maxpacket = 512;
 		dwc->gadget->speed = USB_SPEED_SUPER;
+
+		if (lanes > 1) {
+			dwc->gadget->speed = USB_SPEED_SUPER_PLUS;
+			dwc->gadget->ssp_rate = USB_SSP_GEN_1x2;
+		}
 		break;
 	case DWC3_DSTS_HIGHSPEED:
 		dwc3_gadget_ep0_desc.wMaxPacketSize = cpu_to_le16(64);
@@ -3904,6 +3926,7 @@ int dwc3_gadget_init(struct dwc3 *dwc)
 	dev->platform_data		= dwc;
 	dwc->gadget->ops		= &dwc3_gadget_ops;
 	dwc->gadget->speed		= USB_SPEED_UNKNOWN;
+	dwc->gadget->ssp_rate		= USB_SSP_GEN_UNKNOWN;
 	dwc->gadget->sg_supported	= true;
 	dwc->gadget->name		= "dwc3-gadget";
 	dwc->gadget->lpm_capable	= true;