On 09/02/2014 03:34 PM, Andrew Bresticker wrote:
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 also supports device mode
as well as powergating of the SuperSpeed and host-controller logic
when not in use, but support for these is not yet implemented.
diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
+static bool is_host_mbox_message(u32 cmd)
+{
+ switch (cmd) {
+ case MBOX_CMD_INC_SSPI_CLOCK:
+ case MBOX_CMD_DEC_SSPI_CLOCK:
+ case MBOX_CMD_INC_FALC_CLOCK:
+ case MBOX_CMD_DEC_FALC_CLOCK:
+ return true;
+ case MBOX_CMD_SET_BW:
+ /*
+ * TODO: Request bandwidth once EMC scaling is supported.
+ * Ignore for now since ACK/NAK is not required for SET_BW
+ * messages.
+ */
I think that TODO belongs inside tegra_xhci_mbox_work() where the
message would actually be handled, if implemented.
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