Date:	Wed, 25 Feb 2015 17:01:14 +0100
From:	Thierry Reding <thierry.reding@...il.com>
To:	Andrew Bresticker <abrestic@...omium.org>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	Alexandre Courbot <gnurou@...il.com>,
	linux-tegra@...r.kernel.org, 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>,
	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>, Olof Johansson <olof@...om.net>,
	Kishon Vijay Abraham I <kishon@...com>,
	Felipe Balbi <balbi@...com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-usb@...r.kernel.org
Subject: Re: [PATCH V6 00/12] Tegra xHCI support

On Mon, Nov 24, 2014 at 04:17:12PM -0800, Andrew Bresticker wrote:
> This series adds support for xHCI on NVIDIA Tegra SoCs.  This includes:
>  - patches 1, 2, and 3: minor cleanups for mailbox framework and xHCI,
>  - patches 4 and 5: adding a driver for the mailbox used to communicate
>    with the xHCI controller's firmware,
>  - patches 6 and 7: extending the XUSB pad controller driver to support
>    the USB PHY types (UTMI, HSIC, and USB3),
>  - patches 8 and 9: adding a xHCI host-controller driver, and
>  - patches 10, 11, and 12: updating the relevant DT files.
> 
> The mailbox driver (patch 5) has a compile-time dependency on patch 2 and
> a run-time dependency on patch 3.  Both the PHY (patch 7) and host (patch 9)
> drivers have compile-time dependencies on the mailbox driver.  The host
> driver also has a run-time dependency on patch 1.  Because of this, this
> entire series should probably go through the Tegra tree.  Patches 11 and 12
> should probably not be merged until the controller firmware [0] lands in
> linux-firmware since they disable the EHCI controllers.
> 
> Tested on Venice2, Jetson TK1, and Big with a variety of USB2.0 and
> USB3.0 memory sticks and ethernet dongles.  This has also been tested,
> with additional out-of-tree patches, on a Tegra132-based board.
> 
> Based on v3.18-rc6.  A branch with the entire series is available at:
>   https://github.com/abrestic/linux/tree/tegra-xhci-v6
> 
> Notes:
>  - HSIC support is mostly untested and I think there are still some issues
>    to work out there.  I do have a Tegra124 board with a HSIC hub so I'll
>    try to sort those out later.
>  - The XUSB padctl driver doesn't play nice with the existing Tegra USB2.0
>    PHY driver, so all ports should be assigned to the XHCI controller.
> 
> Based on work by:
>   a lot of people, but from what I can tell from the L4T tree [1], the
>   original authors of the Tegra xHCI driver are:
>     Ajay Gupta <ajayg@...dia.com>
>     Bharath Yadav <byadav@...dia.com>
> 
> [0] https://patchwork.ozlabs.org/patch/400110/
> [1] git://nv-tegra.nvidia.com/linux-3.10.git
> 
> Changes from v5:
>  - Addressed review comments from Jassi and Felipe.
> 
> Changes from v4:
>  - Made USB support optional in padctl driver.
>  - Made usb3-port a pinconfig property again.
>  - Cleaned up mbox_request_channel() error handling and allowed it to defer
>    probing (patch 3).
>  - Minor xHCI (patch 1) and mailbox framework (patch 2) cleanups suggested
>    by Thierry.
>  - Addressed Thierry's review comments.
> 
> Changes from v3:
>  - Fixed USB2.0 flakiness on Jetson-TK1.
>  - Switched to 32-bit DMA mask for host.
>  - Addressed Stephen's review comments.
> 
> Chagnes from v2:
>  - Dropped mailbox channel specifier.  The mailbox driver allocates virtual
>    channels backed by the single physical channel.
>  - Added support for HS_CURR_LEVEL adjustment pinconfig property, which
>    will be required for the Blaze board.
>  - Addressed Stephen's review comments.
> 
> Changes from v1:
>  - Converted mailbox driver to use the common mailbox framework.
>  - Fixed up host driver so that it can now be built and used as a module.
>  - Addressed Stephen's review comments.
>  - Misc. cleanups.
> 
> Andrew Bresticker (11):
>   xhci: Set shared HCD's hcd_priv in xhci_gen_setup
>   mailbox: Make struct mbox_controller's ops field const
>   of: Add NVIDIA Tegra XUSB mailbox binding
>   mailbox: Add NVIDIA Tegra XUSB mailbox driver
>   of: Update Tegra XUSB pad controller binding for USB
>   pinctrl: tegra-xusb: Add USB PHY support
>   of: Add NVIDIA Tegra xHCI controller binding
>   usb: xhci: Add NVIDIA Tegra xHCI host-controller driver
>   ARM: tegra: jetson-tk1: Add xHCI support
>   ARM: tegra: Add Tegra124 XUSB mailbox and xHCI controller
>   ARM: tegra: venice2: Add xHCI support
> 
> Benson Leung (1):
>   mailbox: Fix up error handling in mbox_request_channel()
> 
>  .../bindings/mailbox/nvidia,tegra124-xusb-mbox.txt |   32 +
>  .../pinctrl/nvidia,tegra124-xusb-padctl.txt        |   63 +-
>  .../bindings/usb/nvidia,tegra124-xhci.txt          |  104 ++
>  arch/arm/boot/dts/tegra124-jetson-tk1.dts          |   46 +-
>  arch/arm/boot/dts/tegra124-venice2.dts             |   79 +-
>  arch/arm/boot/dts/tegra124.dtsi                    |   41 +
>  drivers/mailbox/Kconfig                            |    3 +
>  drivers/mailbox/Makefile                           |    2 +
>  drivers/mailbox/mailbox.c                          |   11 +-
>  drivers/mailbox/tegra-xusb-mailbox.c               |  278 +++++
>  drivers/pinctrl/Kconfig                            |    1 +
>  drivers/pinctrl/pinctrl-tegra-xusb.c               | 1262 +++++++++++++++++++-
>  drivers/usb/host/Kconfig                           |   10 +
>  drivers/usb/host/Makefile                          |    1 +
>  drivers/usb/host/xhci-pci.c                        |    5 -
>  drivers/usb/host/xhci-plat.c                       |    5 -
>  drivers/usb/host/xhci-tegra.c                      |  931 +++++++++++++++
>  drivers/usb/host/xhci.c                            |    6 +-
>  include/dt-bindings/pinctrl/pinctrl-tegra-xusb.h   |    7 +
>  include/linux/mailbox_controller.h                 |    2 +-
>  include/soc/tegra/xusb.h                           |   50 +
>  21 files changed, 2852 insertions(+), 87 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/nvidia,tegra124-xusb-mbox.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/nvidia,tegra124-xhci.txt
>  create mode 100644 drivers/mailbox/tegra-xusb-mailbox.c
>  create mode 100644 drivers/usb/host/xhci-tegra.c
>  create mode 100644 include/soc/tegra/xusb.h

Hi Andrew,

Sorry for taking so awfully long to look at this. I've spent some time
looking at various pieces of documentation and I concluded that
representing the port assignment as muxing options doesn't seem right
after all. Instead I've come up with an alternate proposal (attached).
Could you take a look and see if that sounds reasonable to you?

Thierry

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