[PATCH v2 6/9] usb: xhci: Add NVIDIA Tegra xHCI host-controller driver

On Sat, Aug 30, 2014 at 2:15 PM, Greg Kroah-Hartman
[off-list ref] wrote:

On Mon, Aug 18, 2014 at 10:08:22AM -0700, Andrew Bresticker wrote:

quoted

Add support for the on-chip xHCI host controller present on Tegra SoCs.

The driver is currently very basic: it loads the controller with its
firmware, starts the controller, and is able to service messages sent
by the controller's firmware.  The hardware supports device mode as
well as lower-power operating modes, but support for these is not yet
implemented here.

So you are saying the device doesn't really work?  Can it handle USB
transactions properly?

Huh?  It's just as functional as any other xHCI platform host.
Perhaps I should have been more clear about "lower-power operating
modes": this refers to the runtime powergating of the controller's
SuperSpeed and host-controller logic and has nothing to do with USB
link/hub/device power management.

I have a jetson board here, is this the controller for that hardware?
Can I test this series on that platform, or is it for something else?

Yup, that's the platform I primarily used for testing this series.

quoted

+static const struct tegra_xhci_soc_config tegra124_soc_config = {
+     .firmware_file = "nvidia/tegra124/xusb.bin",
+};
+MODULE_FIRMWARE("nvidia/tegra124/xusb.bin");

Has this file been submitted to the linux-firmware tree?

It has been posted, see https://patchwork.ozlabs.org/patch/384013/