Date:   Fri, 3 Feb 2017 16:46:18 +0800
From:   Peter Chen <hzpeterchen@...il.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Stephen Boyd <stephen.boyd@...aro.org>,
        Peter Chen <peter.chen@....com>,
        Felipe Balbi <balbi@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Neil Armstrong <narmstrong@...libre.com>,
        linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andy Gross <andy.gross@...aro.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v8 0/3] Support qcom's HSIC USB and rewrite USB2 HS
 support

On Thu, Jan 26, 2017 at 08:54:12PM +0530, Kishon Vijay Abraham I wrote:
> 
> 
> On Thursday 26 January 2017 04:02 AM, Stephen Boyd wrote:
> > This patch series continues the usb chipidea rewrite for 
> > Qualcommm platforms. I've dropped the patches that were applied
> > to Peter's tree for chipidea. Now the phy drivers are left,
> > along with the patch to call phy_set_mode() at the right place.
> > 
> > I've left the HSIC phy driver here, because it wasn't merged in
> > the last round. Nothing has changed in that driver, so I believe
> > it is ready to be merged now. The chipidea patch is independent and
> > can be merged without causing any dependency with the phy tree.
> 
> merged the phy patches. Please send a patch updating the MAINTAINERS for the
> phy driver.
> 
> Thanks
> Kishon
> > 
> > Patches based on v4.10-rc1 + first 22 patches from v5. Full
> > branch is here[1].
> > 
> > Changes from v7:
> >  * Dropped set_vbus() callback (Kishon)
> >  * Made phy_set_mode() generic and moved into ci_platform_configure() (Peter)
> > 
> > Changes from v6:
> >  * Dropped first 22 applied patches
> >  * Rewrote phy_set_mode() patch to be msm specific
> >  * New set_vbus() callback in phy framework
> >  * Updated HS phy driver for set_vbus() callback
> > 
> > Changes from v5:
> >  * Replaced "Emulate OTGSC interrupt enable path" patch with a patch
> >    from Peter
> >  * Updated HS phy driver to support set_mode callback to handle pullup
> >  * New patch to set the mode to device or host in chipidea udc pullup
> >    function to toggle the pullup for HS mode
> >  * New patch to drop lock around event_notify callback to avoid lockdep
> >    issues
> >  * Removal of extcon usage from HS phy driver
> >  * Picked up acks from Heikki and Peter on ULPI core patch
> > 
> > Changes from v4:
> >  * Picked up Acks from Rob
> >  * Updated HS phy init sequence DT property to restrict it to offsets
> > 
> > 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
> > 
> > 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 [2] to make it work.

It will be fixed after [1] has merged, but I have not found them either
at Greg's linus tree or next tree.

[1] http://www.spinics.net/lists/linux-usb/msg152375.html

Peter

> >  * 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.
> >    I've sent a patch set for this[3], which needs some further
> >    discussion/development. The current plan is to reintroduce the usb
> >    mux framework.
> >  * 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. My current plan
> >    is to use DT graphs/endpoints for this.
> > 
> > [1] https://git.linaro.org/people/stephen.boyd/linux.git/log/?h=usb-hsic-8074
> > [2] https://patchwork.kernel.org/patch/9319527/
> > [3] https://lkml.kernel.org/r/20160914014246.31847-1-stephen.boyd@linaro.org
> > 
> > Stephen Boyd (3):
> >   usb: chipidea: Configure phy for appropriate mode
> >   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    |  84 ++++++
> >  .../devicetree/bindings/phy/qcom,usb-hsic-phy.txt  |  65 +++++
> >  drivers/phy/Kconfig                                |  15 ++
> >  drivers/phy/Makefile                               |   2 +
> >  drivers/phy/phy-qcom-usb-hs.c                      | 296 +++++++++++++++++++++
> >  drivers/phy/phy-qcom-usb-hsic.c                    | 160 +++++++++++
> >  drivers/usb/chipidea/core.c                        |  20 +-
> >  7 files changed, 636 insertions(+), 6 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 drivers/phy/phy-qcom-usb-hs.c
> >  create mode 100644 drivers/phy/phy-qcom-usb-hsic.c
> > 
> 
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-- 

Best Regards,
Peter Chen

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