This is an adoption of U-Boot commit bbc6f06c0031249bf1983b875e54cb7549bafe60:
| commit bbc6f06c0031249bf1983b875e54cb7549bafe60
| Author: Bin Meng <bmeng...@gmail.com>
| Date: Wed Jul 19 21:51:13 2017 +0800
|
| usb: hub: Support 'set hub depth' request for USB 3.0 hubs
|
| USB 3.0 hub uses a hub depth value multiplied by four as an offset
| into the 'route string' to locate the bits it uses to determine the
| downstream port number. We shall set the hub depth value of a USB
| 3.0 hub after it is configured.
|
| Signed-off-by: Bin Meng <bmeng...@gmail.com>
| Reviewed-by: Simon Glass <s...@chromium.org>
In this patch we also support recording the depth of a hub in
struct usb_device.
Signed-off-by: Sascha Hauer <s.ha...@pengutronix.de>
---
drivers/usb/core/hub.c | 46 +++++++++++++++++++++++++++++++++++++++++-
drivers/usb/core/usb.c | 3 +++
include/usb/usb.h | 3 +++
3 files changed, 51 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7c7a325291..2e702e5954 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -43,11 +43,38 @@ struct usb_device_scan {
static LIST_HEAD(usb_scan_list);
+static bool usb_hub_is_superspeed(struct usb_device *hdev)
+{
+ return hdev->descriptor->bDeviceProtocol == 3;
+}
+
+bool usb_hub_is_root_hub(struct usb_device *hdev)
+{
+ return hdev->level == 0;
+}
+
+static int usb_set_hub_depth(struct usb_device *dev, int depth)
+{
+ dev_dbg(&dev->dev, "set hub depth to %d\n", dev->level);
+
+ if (depth < 0 || depth > 4)
+ return -EINVAL;
+
+ return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
+ HUB_SET_DEPTH, USB_DIR_OUT | USB_RT_HUB,
+ depth, 0, NULL, 0, USB_CNTL_TIMEOUT);
+}
+
static int usb_get_hub_descriptor(struct usb_device *dev, void *data, int size)
{
+ unsigned short dtype = USB_DT_HUB;
+
+ if (usb_hub_is_superspeed(dev))
+ dtype = USB_DT_SS_HUB;
+
return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
- USB_DT_HUB << 8, 0, data, size, USB_CNTL_TIMEOUT);
+ dtype << 8, 0, data, size, USB_CNTL_TIMEOUT);
}
static int usb_clear_port_feature(struct usb_device *dev, int port, int
feature)
@@ -550,6 +577,23 @@ static int usb_hub_configure(struct usb_device *dev)
dev_dbg(&dev->dev, "%sover-current condition exists\n",
(le16_to_cpu(hubsts->wHubStatus) & HUB_STATUS_OVERCURRENT) ? \
"" : "no ");
+
+ if (!usb_hub_is_root_hub(dev) && usb_hub_is_superspeed(dev)) {
+ int ret;
+
+ /*
+ * This request sets the value that the hub uses to
+ * determine the index into the 'route string index'
+ * for this hub.
+ */
+ ret = usb_set_hub_depth(dev, dev->level - 1);
+ if (ret < 0) {
+ dev_dbg(&dev->dev, "failed to set hub depth
(0x%08lx)\n",
+ dev->status);
+ return ret;
+ }
+ }
+
usb_hub_power_on(hub);
return 0;
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 06087d2df6..b94f7978a3 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -350,6 +350,9 @@ int usb_new_device(struct usb_device *dev)
dev->epmaxpacketin[0] = 64;
dev->epmaxpacketout[0] = 64;
+ if (parent)
+ dev->level = parent->level + 1;
+
err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, desc, 64);
if (err < 0) {
dev_dbg(&dev->dev, "%s: usb_get_descriptor() failed with %d\n",
__func__, err);
diff --git a/include/usb/usb.h b/include/usb/usb.h
index 94506fa525..5de9e25863 100644
--- a/include/usb/usb.h
+++ b/include/usb/usb.h
@@ -108,6 +108,7 @@ struct usb_device {
int act_len; /* transfered bytes */
int maxchild; /* Number of ports if hub */
int portnr;
+ int level;
struct usb_device *parent;
struct usb_device *children[USB_MAXCHILDREN];
@@ -460,4 +461,6 @@ int usb_register_otg_device(struct device_d *parent,
extern struct list_head usb_device_list;
+bool usb_hub_is_root_hub(struct usb_device *hdev);
+
#endif /*_USB_H_ */
--
2.26.0.rc2
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