linux-kernel - Re: [PATCH v3 6/9] usb: xhci: Add NVIDIA Tegra xHCI host-controller driver

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Date:	Wed, 03 Sep 2014 10:17:27 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Bresticker <abrestic@...omium.org>,
	Thierry Reding <thierry.reding@...il.com>,
	linux-tegra@...r.kernel.org
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>,
	Kishon Vijay Abraham I <kishon@...com>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-usb@...r.kernel.org
Subject: Re: [PATCH v3 6/9] usb: xhci: Add NVIDIA Tegra xHCI host-controller
 driver

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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