usb: hub: Parse and save TT details from device descriptor

[oweals/u-boot.git] / common / usb_hub.c

diff --git a/common/usb_hub.c b/common/usb_hub.c
index 18c366ab7e0b800850c2efdab1447c2ec7758d7e..bbb1155089644f24379c947ef86844dc16f5486a 100644 (file)
--- a/common/usb_hub.c
+++ b/common/usb_hub.c
@@ -700,6 +700,56 @@ static int usb_hub_configure(struct usb_device *dev)
                break;
        }
 
+       switch (dev->descriptor.bDeviceProtocol) {
+       case USB_HUB_PR_FS:
+               break;
+       case USB_HUB_PR_HS_SINGLE_TT:
+               debug("Single TT\n");
+               break;
+       case USB_HUB_PR_HS_MULTI_TT:
+               ret = usb_set_interface(dev, 0, 1);
+               if (ret == 0) {
+                       debug("TT per port\n");
+                       hub->tt.multi = true;
+               } else {
+                       debug("Using single TT (err %d)\n", ret);
+               }
+               break;
+       case USB_HUB_PR_SS:
+               /* USB 3.0 hubs don't have a TT */
+               break;
+       default:
+               debug("Unrecognized hub protocol %d\n",
+                     dev->descriptor.bDeviceProtocol);
+               break;
+       }
+
+       /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */
+       switch (hubCharacteristics & HUB_CHAR_TTTT) {
+       case HUB_TTTT_8_BITS:
+               if (dev->descriptor.bDeviceProtocol != 0) {
+                       hub->tt.think_time = 666;
+                       debug("TT requires at most %d FS bit times (%d ns)\n",
+                             8, hub->tt.think_time);
+               }
+               break;
+       case HUB_TTTT_16_BITS:
+               hub->tt.think_time = 666 * 2;
+               debug("TT requires at most %d FS bit times (%d ns)\n",
+                     16, hub->tt.think_time);
+               break;
+       case HUB_TTTT_24_BITS:
+               hub->tt.think_time = 666 * 3;
+               debug("TT requires at most %d FS bit times (%d ns)\n",
+                     24, hub->tt.think_time);
+               break;
+       case HUB_TTTT_32_BITS:
+               hub->tt.think_time = 666 * 4;
+               debug("TT requires at most %d FS bit times (%d ns)\n",
+                     32, hub->tt.think_time);
+               break;
+       }
+
        debug("power on to power good time: %dms\n",
              descriptor->bPwrOn2PwrGood * 2);
        debug("hub controller current requirement: %dmA\n",