diff options
| author | Yunzhi Li <lyz@rock-chips.com> | 2015-07-02 15:28:11 +0800 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-07-16 22:39:59 +0200 |
| commit | ebd3da7dba7d72b0d7a4fa50ffbad61259562447 (patch) | |
| tree | 715a8a4873f22173fad0c73cbf311d3ca1081a96 /payloads/libpayload/drivers/usb/usb.c | |
| parent | ae3d71a4d10b28bb5da1b3399358988acdcf1ace (diff) | |
| download | coreboot-ebd3da7dba7d72b0d7a4fa50ffbad61259562447.tar.xz | |
libpayload: usb: dwc2: support split transaction
With split transaction, dwc2 host controller can handle full- and
low-speed devices on hub in high-speed mode. This commit adds support
for split control and interrupt transfers
BUG=None
TEST=Connect usb keyboard through hub, usb keyboard can work
BRANCH=None
Change-Id: If7a00db21c8ad4c635f39581382b877603075d1a
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 4fb514b7f7f7e414fa94bfce05420957b1c57019
Original-Change-Id: I07e64064c6182d33905ae4efb13712645de7cf93
Original-Signed-off-by: Yunzhi Li <lyz@rock-chips.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/283282
Original-Tested-by: Lin Huang <hl@rock-chips.com>
Original-Commit-Queue: Lin Huang <hl@rock-chips.com>
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/10956
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'payloads/libpayload/drivers/usb/usb.c')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usb.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usb.c b/payloads/libpayload/drivers/usb/usb.c index 6174d639d2..e00d92f00a 100644 --- a/payloads/libpayload/drivers/usb/usb.c +++ b/payloads/libpayload/drivers/usb/usb.c @@ -653,3 +653,29 @@ usb_generic_init (usbdev_t *dev) usb_detach_device(dev->controller, dev->address); } } + +/* + * returns the address of the closest USB2.0 hub, which is responsible for + * split transactions, along with the number of the used downstream port + */ +int closest_usb2_hub(const usbdev_t *dev, int *const addr, int *const port) +{ + const usbdev_t *usb1dev; + + do { + usb1dev = dev; + if ((dev->hub >= 0) && (dev->hub < 128)) + dev = dev->controller->devices[dev->hub]; + else + dev = NULL; + } while (dev && (dev->speed < 2)); + + if (dev) { + *addr = usb1dev->hub; + *port = usb1dev->port; + return 0; + } + + usb_debug("Couldn't find closest USB2.0 hub.\n"); + return 1; +} |