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| author | Sascha Hauer <s.hauer@pengutronix.de> | 2020-02-28 10:29:32 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2020-03-20 10:07:16 +0100 |
| commit | 891b0a02566c477e4b48cece3fbdae1fd3029a5c (patch) | |
| tree | 030e7dfd001ec160a9b1091b16e3e4b5dfac1446 /drivers/usb/core | |
| parent | 5b17d93e75795413bc66b0b20ee4f3960ddce316 (diff) | |
| download | barebox-891b0a02566c477e4b48cece3fbdae1fd3029a5c.tar.gz barebox-891b0a02566c477e4b48cece3fbdae1fd3029a5c.tar.xz | |
usb: hub: Parse and save TT details from device descriptor
Adoption of U-Boot commit 5624dfd5aa91c244519ec60b40b4a42b4d9a43ca:
| commit 5624dfd5aa91c244519ec60b40b4a42b4d9a43ca
| Author: Bin Meng <bmeng.cn@gmail.com>
| Date: Wed Jul 19 21:51:16 2017 +0800
|
| usb: hub: Parse and save TT details from device descriptor
|
| A high speed hub has a special responsibility to handle full speed/
| low speed devices connected on downstream ports. In this case, the
| hub must isolate the high speed signaling environment from the full
| speed/low speed signaling environment with the help of Transaction
| Translator (TT). TT details are provided by hub descriptors and we
| parse and save it to hub uclass_priv for later use.
|
| Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
| Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/usb/core')
| -rw-r--r-- | drivers/usb/core/hub.c | 52 |
1 files changed, 51 insertions, 1 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c index 6d664e80bb..7c7a325291 100644 --- a/drivers/usb/core/hub.c +++ b/drivers/usb/core/hub.c @@ -388,7 +388,7 @@ static int usb_hub_configure(struct usb_device *dev) unsigned char buffer[USB_BUFSIZ], *bitmap; struct usb_hub_descriptor *descriptor; struct usb_hub_status *hubsts; - int i; + int i, ret; struct usb_hub_device *hub; hub = xzalloc(sizeof (*hub)); @@ -468,6 +468,56 @@ 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: + dev_dbg(&dev->dev, "Single TT\n"); + break; + case USB_HUB_PR_HS_MULTI_TT: + ret = usb_set_interface(dev, 0, 1); + if (ret == 0) { + dev_dbg(&dev->dev, "TT per port\n"); + hub->tt.multi = true; + } else { + dev_dbg(&dev->dev, "Using single TT (err %d)\n", ret); + } + break; + case USB_HUB_PR_SS: + /* USB 3.0 hubs don't have a TT */ + break; + default: + dev_dbg(&dev->dev, "Unrecognized hub protocol %d\n", + dev->descriptor->bDeviceProtocol); + break; + } + + /* Note 8 FS bit times == (8 bits / 12000000 bps) ~= 666ns */ + switch (hub->desc.wHubCharacteristics & HUB_CHAR_TTTT) { + case HUB_TTTT_8_BITS: + if (dev->descriptor->bDeviceProtocol != 0) { + hub->tt.think_time = 666; + dev_dbg(&dev->dev, "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; + dev_dbg(&dev->dev, "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; + dev_dbg(&dev->dev, "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; + dev_dbg(&dev->dev, "TT requires at most %d FS bit times (%d ns)\n", + 32, hub->tt.think_time); + break; + } + dev_dbg(&dev->dev, "power on to power good time: %dms\n", descriptor->bPwrOn2PwrGood * 2); dev_dbg(&dev->dev, "hub controller current requirement: %dmA\n", |