On Tue, Mar 21, 2017 at 12:33:28PM +0100, Ingo Molnar wrote: > > * Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote: > > > xHCI debug capability (DbC) is an optional but standalone > > functionality provided by an xHCI host controller. With DbC > > hardware initialized, the system will present a debug device > > through the USB3 debug port (normally the first USB3 port). > > The debug device is fully compliant with the USB framework > > and provides the equivalent of a very high performance (USB3) > > full-duplex serial link between the debug host and target. > > The DbC functionality is independent of xHCI host. > > > > This patch set adds support for early printk functionality > > through a USB3 debug port by 1) initializing and enabling > > the DbC hardware during early boot; 2) registering a boot > > console to the system so that early printk messages can go > > through the USB3 debug port. It also includes some lines > > of changes in usb_debug driver so that it can be bound when > > a USB3 debug device is enumerated. > > > [...] > > > > Lu Baolu (5): > > x86: add simple udelay calibration > > usb: early: add driver for xhci debug capability > > x86: add support for earlyprintk via USB3 debug port > > usb: serial: add dbc debug device support to usb_debug > > usb: doc: add document for USB3 debug port usage > > > > Documentation/admin-guide/kernel-parameters.txt | 1 + > > Documentation/usb/usb3-debug-port.rst | 100 +++ > > arch/x86/Kconfig.debug | 23 + > > arch/x86/kernel/early_printk.c | 5 + > > arch/x86/kernel/setup.c | 26 + > > drivers/usb/Makefile | 2 +- > > drivers/usb/early/Makefile | 1 + > > drivers/usb/early/xhci-dbc.c | 1014 +++++++++++++++++++++++ > > drivers/usb/early/xhci-dbc.h | 211 +++++ > > drivers/usb/serial/usb_debug.c | 28 +- > > include/linux/usb/xhci-dbgp.h | 29 + > > 11 files changed, 1436 insertions(+), 4 deletions(-) > > create mode 100644 Documentation/usb/usb3-debug-port.rst > > create mode 100644 drivers/usb/early/xhci-dbc.c > > create mode 100644 drivers/usb/early/xhci-dbc.h > > create mode 100644 include/linux/usb/xhci-dbgp.h > > Ok, this has now become a high quality series with picture-perfect patches AFAICS. > > Thomas also gave his Acked-by to all the patches. > > I've applied them locally to -tip (it appears the USB maintainers are still fine > with this being carried in tip:x86/debug for a v4.12 merge, right?), and will push > them out and will propagate them to linux-next as well if they pass testing. Yes, no objection from me. thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
