From 337fc7e665a20bd0c23da233ffb9e8469d999e72 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Wed, 19 Jul 2017 21:50:00 +0800
Subject: usb: hub: Change USB hub descriptor to match USB 3.0 hubs

USB 3.0 hubs have a slightly different hub descriptor than USB 2.0
hubs, with a fixed (rather than variable length) size. Change the
host controller drivers that access those last two fields
(DeviceRemovable and PortPowerCtrlMask) to use the union.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>

diff --git a/common/usb_hub.c b/common/usb_hub.c
index 83c6767..a46d26a 100644
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -583,17 +583,19 @@ static int usb_hub_configure(struct usb_device *dev)
 			&descriptor->wHubCharacteristics)),
 			&hub->desc.wHubCharacteristics);
 	/* set the bitmap */
-	bitmap = (unsigned char *)&hub->desc.DeviceRemovable[0];
+	bitmap = (unsigned char *)&hub->desc.u.hs.DeviceRemovable[0];
 	/* devices not removable by default */
 	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8);
-	bitmap = (unsigned char *)&hub->desc.PortPowerCtrlMask[0];
+	bitmap = (unsigned char *)&hub->desc.u.hs.PortPowerCtrlMask[0];
 	memset(bitmap, 0xff, (USB_MAXCHILDREN+1+7)/8); /* PowerMask = 1B */
 
 	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
-		hub->desc.DeviceRemovable[i] = descriptor->DeviceRemovable[i];
+		hub->desc.u.hs.DeviceRemovable[i] =
+			descriptor->u.hs.DeviceRemovable[i];
 
 	for (i = 0; i < ((hub->desc.bNbrPorts + 1 + 7)/8); i++)
-		hub->desc.PortPowerCtrlMask[i] = descriptor->PortPowerCtrlMask[i];
+		hub->desc.u.hs.PortPowerCtrlMask[i] =
+			descriptor->u.hs.PortPowerCtrlMask[i];
 
 	dev->maxchild = descriptor->bNbrPorts;
 	debug("%d ports detected\n", dev->maxchild);
@@ -637,7 +639,7 @@ static int usb_hub_configure(struct usb_device *dev)
 
 	for (i = 0; i < dev->maxchild; i++)
 		debug("port %d is%s removable\n", i + 1,
-		      hub->desc.DeviceRemovable[(i + 1) / 8] & \
+		      hub->desc.u.hs.DeviceRemovable[(i + 1) / 8] & \
 		      (1 << ((i + 1) % 8)) ? " not" : "");
 
 	if (sizeof(struct usb_hub_status) > USB_BUFSIZ) {
diff --git a/drivers/usb/emul/sandbox_hub.c b/drivers/usb/emul/sandbox_hub.c
index 9ffda9c..1432858 100644
--- a/drivers/usb/emul/sandbox_hub.c
+++ b/drivers/usb/emul/sandbox_hub.c
@@ -96,7 +96,12 @@ static struct usb_hub_descriptor hub_desc = {
 								1 << 7),
 	.bPwrOn2PwrGood		= 2,
 	.bHubContrCurrent	= 5,
-	.DeviceRemovable	= {0, 0xff}, /* all ports removeable */
+	{
+		{
+			/* all ports removeable */
+			.DeviceRemovable	= {0, 0xff}
+		}
+	}
 #if SANDBOX_NUM_PORTS > 8
 #error "This code sets up an incorrect mask"
 #endif
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index f08709d..40ac3a6 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -52,8 +52,8 @@ static struct descriptor {
 		0,		/* wHubCharacteristics */
 		10,		/* bPwrOn2PwrGood */
 		0,		/* bHubCntrCurrent */
-		{},		/* Device removable */
-		{}		/* at most 7 ports! XXX */
+		{		/* Device removable */
+		}		/* at most 7 ports! XXX */
 	},
 	{
 		0x12,		/* bLength */
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 59ee476..d5a1b34 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -50,8 +50,8 @@ static struct descriptor {
 		cpu_to_le16(0x8), /* wHubCharacteristics */
 		10,		/* bPwrOn2PwrGood */
 		0,		/* bHubCntrCurrent */
-		{},		/* Device removable */
-		{}		/* at most 7 ports! XXX */
+		{		/* Device removable */
+		}		/* at most 7 ports! XXX */
 	},
 	{
 		0x12,		/* bLength */
diff --git a/include/usb.h b/include/usb.h
index 62f051f..eb82cc2 100644
--- a/include/usb.h
+++ b/include/usb.h
@@ -546,10 +546,20 @@ struct usb_hub_descriptor {
 	unsigned short wHubCharacteristics;
 	unsigned char  bPwrOn2PwrGood;
 	unsigned char  bHubContrCurrent;
-	unsigned char  DeviceRemovable[(USB_MAXCHILDREN+1+7)/8];
-	unsigned char  PortPowerCtrlMask[(USB_MAXCHILDREN+1+7)/8];
-	/* DeviceRemovable and PortPwrCtrlMask want to be variable-length
-	   bitmaps that hold max 255 entries. (bit0 is ignored) */
+	/* 2.0 and 3.0 hubs differ here */
+	union {
+		struct {
+			/* add 1 bit for hub status change; round to bytes */
+			__u8 DeviceRemovable[(USB_MAXCHILDREN + 1 + 7) / 8];
+			__u8 PortPowerCtrlMask[(USB_MAXCHILDREN + 1 + 7) / 8];
+		} __attribute__ ((packed)) hs;
+
+		struct {
+			__u8 bHubHdrDecLat;
+			__le16 wHubDelay;
+			__le16 DeviceRemovable;
+		} __attribute__ ((packed)) ss;
+	} u;
 } __attribute__ ((packed));
 
 
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