On Wed, Dec 28, 2016 at 02:56:46PM -0800, Stephen Boyd 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[1], 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 v4.10-rc1 > > 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 > Hi Stephen, I have pushed your first 22 patches to my ci-for-usb-next, fixed the conflict for patch 10, and dropped your patch 23. Peter > 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. > * 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. > * 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. > > [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@xxxxxxxxxx > > Peter Chen (1): > usb: chipidea: vbus event may exist before starting gadget > > Stephen Boyd (24): > 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 > usb: chipidea: Drop lock across event_notify during gadget stop > usb: chipidea: Pullup D+ in device mode via phy APIs > 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 | 78 ++++++ > .../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 | 243 ++++++++++++++++++ > 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 | 126 ++++------ > drivers/usb/chipidea/host.c | 10 + > drivers/usb/chipidea/otg.c | 96 +++++-- > drivers/usb/chipidea/udc.c | 17 +- > drivers/usb/chipidea/ulpi.c | 113 +++++++++ > drivers/usb/common/ulpi.c | 79 +++++- > include/linux/of_device.h | 6 + > include/linux/usb/chipidea.h | 9 +- > 20 files changed, 1227 insertions(+), 148 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 > > -- > 2.10.0.297.gf6727b0 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
