Date:   Thu, 8 Sep 2016 10:06:45 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Stephen Boyd <stephen.boyd@...aro.org>
Cc:     "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        lkml <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Peter Chen <peter.chen@....com>,
        "Ivan T. Ivanov" <iivanov.xz@...il.com>,
        devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: Re: [PATCH v4 00/22] Support qcom's HSIC USB and rewrite USB2 HS support

On Thu, Sep 8, 2016 at 5:34 AM, Stephen Boyd <stephen.boyd@...aro.org> wrote:
> The state of USB ChipIdea support on Qualcomm's platforms is not great.
> The DT description of these devices requires up to three different nodes
> for what amounts to be the same hardware block, when there should really
> only be one. Furthermore, the "phy" driver that is in mainline (phy-msm-usb.c)
> duplicates the OTG state machine and touches the ci controller wrapper
> registers when it should really be focused on the phy and the ULPI accesses
> needed to get the phy working. There's also a slimmed down phy driver for
> the msm8916 platform, but really the phy hardware is the same as other MSMs,
> so we have two drivers doing pretty much the same thing. This leads to a
> situtaion where we have the chipidea core driver, the "phy" driver, and
> sometimes the ehci-msm.c driver operating the same device all at the same
> time with very little coordination. This just isn't very safe and is
> confusing from a driver perspective when trying to figure out who does what.
> Finally, there isn't any HSIC support on platforms like apq8074 so we
> should add that.
>
> This patch series updates the ChipIdea driver and the MSM wrapper
> (ci_hdrc_msm.c) to properly handle the PHY and wrapper bits at the right
> times in the right places. To get there, we update the ChipIdea core to
> have support for the ULPI phy bus introduced by Heikki. Along the way
> we fix bugs with the extcon handling for peripheral and OTG mode controllers
> and move the parts of phy-usb-msm.c that are touching the CI controller
> wrapper into the wrapper driver (ci_hdrc_msm.c). Finally we add support
> for the HSIC phy based on the ULPI bus and rewrite the HS phy driver
> (phy-usb-msm.c) as a standard ULPI phy driver.
>
> Once this series is accepted, we should be able to delete the phy-usb-msm.c,
> phy-qcom-8x16-usb.c, and ehci-msm.c drivers from the tree and use the ULPI
> based phy driver (which also lives in drivers/phy/ instead of drivers/usb/phy/)
> and the chipidea host core instead.
>
> I've also sent separate patches for other minor pieces to make this
> all work. The full tree can be found here[3], hacks and all to get
> things working. I've tested this on the db410c, apq8074 dragonboard,
> and ifc6410 with configfs gadgets and otg cables.
>
> Patches based on v4.8-rc1
>
> Changes from v3:
>
>  * Picked up Acks from Peter
>
>  * Updated extcon consolidation patch per Peter's comments
>
>  * Folded in simplification from Heikki for ULPI DT matching
>

I find the kbuild dependency error when compile your series, I remembered
someone met it before, would you have a solution:

  GEN     ./Makefile
scripts/kconfig/conf  --silentoldconfig Kconfig
drivers/usb/Kconfig:39:error: recursive dependency detected!
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/usb/Kconfig:39: symbol USB is selected by MOUSE_APPLETOUCH
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/input/mouse/Kconfig:187: symbol MOUSE_APPLETOUCH depends on INPUT
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/input/Kconfig:8: symbol INPUT is selected by VT
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/tty/Kconfig:12: symbol VT is selected by FB_STI
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/video/fbdev/Kconfig:674: symbol FB_STI depends on FB
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/video/fbdev/Kconfig:5: symbol FB is selected by DRM_KMS_FB_HELPER
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/Kconfig:42: symbol DRM_KMS_FB_HELPER is selected by
DRM_KMS_CMA_HELPER
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/Kconfig:98: symbol DRM_KMS_CMA_HELPER is selected by DRM_IMX
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/gpu/drm/imx/Kconfig:1: symbol DRM_IMX depends on IMX_IPUV3_CORE
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/gpu/ipu-v3/Kconfig:1: symbol IMX_IPUV3_CORE depends on RESET_CONTROLLER
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/reset/Kconfig:4: symbol RESET_CONTROLLER is selected by USB_CHIPIDEA
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/usb/chipidea/Kconfig:1: symbol USB_CHIPIDEA depends on USB_EHCI_HCD
For a resolution refer to Documentation/kbuild/kconfig-language.txt
subsection "Kconfig recursive dependency limitations"
drivers/usb/host/Kconfig:84: symbol USB_EHCI_HCD depends on USB
#

Peter

> Changes from v2:
>
>  * Added SoC specific compatibles in phy bindings
>
>  * Dropped AVVIS patch for OTG statemachine
>
>  * New patch to consolidate extcon handlers
>
>  * Picked up Acks from Peter
>
>  * Rebased onto v4.8-rc1
>
>  * Reworked ULPI OF code to look at vid == 0 instead of pid == 0
>
>  * Dropped ULPI bindings for vid and pid overrides
>
> Changes from v1:
>
>  * Reworked ULPI device probing to keep using vendor/product ids that
>    come from DT if needed and falls back to OF style match when product id
>    is 0
>
>  * PHY init later patch was rejected so that moved to a quirk flag and
>    the msm wrapper started managing the phy on/off
>
>  * Updated clk requirements for HSIC phy in binding doc
>
>  * Added optional clk in wrapper for "housekeeping" found on older qcom
>    platforms
>
>  * Bug fix to OTGSC polling function
>
>  * Changed runtime PM patch to set as active instead of get/put
>
> TODO:
>  * DMA fails on arm64 so we need something like [1] to make it work.
>
>  * The db410c needs a driver to toggle the onboard switch to connect
>    the usb hub instead of micro port when the usb cable is disconnected
>
>  * apq8064 platforms need a vbus regulator to really use otg and I haven't
>    tried out the RPM based regulators yet
>
>  * The HSIC phy on the apq8074 dragonboard is connected to a usb4604
>    device which requires the i2c driver to probe and send an i2c
>    sequence before the HSIC controller enumerates or HSIC doesn't work.
>    Right now I have a hack to force the controller to probe defer
>    once so that usb4604 probes first. This needs a more proper solution
>    like having the DT describe a linkage between the controller and
>    the usb device so we can enforce probe ordering.
>
>  * OTG support requires a working VBUS supply on apq8074 dragonboard
>    and that requires changes to the smbb_charger driver to support
>    the OTG OVP switch as a regulator[2]. This series needs revival
>    on the list so that OTG works properly on that board.
>
> [1] https://lkml.org/lkml/2016/2/22/7
> [2] http://lkml.kernel.org/g/1449621618-11900-1-git-send-email-tim.bird@sonymobile.com
> [3] https://git.linaro.org/people/stephen.boyd/linux.git/shortlog/refs/heads/usb-hsic-8074
>
>
> Stephen Boyd (22):
>   of: device: Support loading a module with OF based modalias
>   of: device: Export of_device_{get_modalias,uvent_modalias} to modules
>   usb: ulpi: Support device discovery via DT
>   usb: chipidea: Only read/write OTGSC from one place
>   usb: chipidea: Handle extcon events properly
>   usb: chipidea: Add platform flag for wrapper phy management
>   usb: chipidea: Notify events when switching host mode
>   usb: chipidea: Remove locking in ci_udc_start()
>   usb: chipidea: Add support for ULPI PHY bus
>   usb: chipidea: Consolidate extcon notifiers
>   usb: chipidea: msm: Mark device as runtime pm active
>   usb: chipidea: msm: Rely on core to override AHBBURST
>   usb: chipidea: msm: Use hw_write_id_reg() instead of writel
>   usb: chipidea: msm: Add proper clk and reset support
>   usb: chipidea: msm: Mux over secondary phy at the right time
>   usb: chipidea: msm: Restore wrapper settings after reset
>   usb: chipidea: msm: Make platform data driver local instead of global
>   usb: chipidea: msm: Add reset controller for PHY POR bit
>   usb: chipidea: msm: Handle phy power states
>   usb: chipidea: msm: Be silent on probe defer errors
>   phy: Add support for Qualcomm's USB HSIC phy
>   phy: Add support for Qualcomm's USB HS phy
>
>  .../devicetree/bindings/phy/qcom,usb-hs-phy.txt    |  83 ++++++
>  .../devicetree/bindings/phy/qcom,usb-hsic-phy.txt  |  65 +++++
>  Documentation/devicetree/bindings/usb/ulpi.txt     |  20 ++
>  drivers/of/device.c                                |  25 ++
>  drivers/phy/Kconfig                                |  15 ++
>  drivers/phy/Makefile                               |   2 +
>  drivers/phy/phy-qcom-usb-hs.c                      | 289 +++++++++++++++++++++
>  drivers/phy/phy-qcom-usb-hsic.c                    | 160 ++++++++++++
>  drivers/usb/chipidea/Kconfig                       |   8 +
>  drivers/usb/chipidea/Makefile                      |   1 +
>  drivers/usb/chipidea/ci.h                          |  22 +-
>  drivers/usb/chipidea/ci_hdrc_msm.c                 | 280 +++++++++++++++++---
>  drivers/usb/chipidea/core.c                        | 122 ++++-----
>  drivers/usb/chipidea/host.c                        |  10 +
>  drivers/usb/chipidea/otg.c                         |  86 +++++-
>  drivers/usb/chipidea/udc.c                         |   3 -
>  drivers/usb/chipidea/ulpi.c                        | 113 ++++++++
>  drivers/usb/common/ulpi.c                          |  77 +++++-
>  include/linux/of_device.h                          |   6 +
>  include/linux/usb/chipidea.h                       |   9 +-
>  20 files changed, 1259 insertions(+), 137 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt
>  create mode 100644 Documentation/devicetree/bindings/phy/qcom,usb-hsic-phy.txt
>  create mode 100644 Documentation/devicetree/bindings/usb/ulpi.txt
>  create mode 100644 drivers/phy/phy-qcom-usb-hs.c
>  create mode 100644 drivers/phy/phy-qcom-usb-hsic.c
>  create mode 100644 drivers/usb/chipidea/ulpi.c
>
> --
> 2.9.0.rc2.8.ga28705d
>
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