| Message ID | 20200326134507.4808-1-narmstrong@baylibre.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | usb: dwc3: meson: add OTG support for GXL/GXM | expand |
Hi, Neil Armstrong <narmstrong@baylibre.com> writes: > The USB support was initialy done with a set of PHYs and dwc3-of-simple > because the architecture of the USB complex was not understood correctly > at the time (and proper documentation was missing...). > > But with the G12A family, the USB complex was correctly understood and > implemented correctly. > But seems the G12A architecture was derived for the GXL USB architecture, > with minor differences and looks we can share most of the USB DWC3 glue > driver. > > This patchset refactors and adds callbacks to handle the architecture > difference while keeping the main code shared. > > The main difference is that on GXL/GXM the USB2 PHY control registers > are mixed with the PHY registers (we already handle correctly), and > the GLUE registers are allmost (99%) the same as G12A. > > But, the GXL/GXM HW is buggy, here are the quirks : > - for the DWC2 controller to reset correctly, the GLUE mux must be switched > to peripheral when the DWC2 controller probes. For now it's handled by simply > switching to device when probing the subnodes, but it may be not enough > - when manually switching from Host to Device when the USB port is not > populated (should not happen with proper Micro-USB/USB-C OTG switch), it > makes the DWC3 to crash. The only way to avoid that is to use the Host > Disconnect bit to disconnect the DWC3 controller from the port, but we can't > recover the Host functionnality unless resetting the DWC3 controller. > This bit is set when only manual switch is done, and a warning is printed > on manual switching. > > The patches 1-9 should be applied first, then either waiting the next release > or if the usb maintainer can provide us a stable tag, we can use it to merge > the DT and bindings. > > Changes since v1 at [1]: > - Fixed DT bindings to take in account usb2-phy2 on GXM > - Added comment in patch2 > - Fixed patch 5 and moved fix out > - Collected tags > - Lower DT patch changes, switch p20x-q20x port B as OTG by default patches 1-6 are applied to my testing/next
On 29/03/2020 12:36, Felipe Balbi wrote: > > Hi, > > Neil Armstrong <narmstrong@baylibre.com> writes: >> The USB support was initialy done with a set of PHYs and dwc3-of-simple >> because the architecture of the USB complex was not understood correctly >> at the time (and proper documentation was missing...). >> >> But with the G12A family, the USB complex was correctly understood and >> implemented correctly. >> But seems the G12A architecture was derived for the GXL USB architecture, >> with minor differences and looks we can share most of the USB DWC3 glue >> driver. >> >> This patchset refactors and adds callbacks to handle the architecture >> difference while keeping the main code shared. >> >> The main difference is that on GXL/GXM the USB2 PHY control registers >> are mixed with the PHY registers (we already handle correctly), and >> the GLUE registers are allmost (99%) the same as G12A. >> >> But, the GXL/GXM HW is buggy, here are the quirks : >> - for the DWC2 controller to reset correctly, the GLUE mux must be switched >> to peripheral when the DWC2 controller probes. For now it's handled by simply >> switching to device when probing the subnodes, but it may be not enough >> - when manually switching from Host to Device when the USB port is not >> populated (should not happen with proper Micro-USB/USB-C OTG switch), it >> makes the DWC3 to crash. The only way to avoid that is to use the Host >> Disconnect bit to disconnect the DWC3 controller from the port, but we can't >> recover the Host functionnality unless resetting the DWC3 controller. >> This bit is set when only manual switch is done, and a warning is printed >> on manual switching. >> >> The patches 1-9 should be applied first, then either waiting the next release >> or if the usb maintainer can provide us a stable tag, we can use it to merge >> the DT and bindings. >> >> Changes since v1 at [1]: >> - Fixed DT bindings to take in account usb2-phy2 on GXM >> - Added comment in patch2 >> - Fixed patch 5 and moved fix out >> - Collected tags >> - Lower DT patch changes, switch p20x-q20x port B as OTG by default > > patches 1-6 are applied to my testing/next > Thanks ! Neil
The USB support was initialy done with a set of PHYs and dwc3-of-simple because the architecture of the USB complex was not understood correctly at the time (and proper documentation was missing...). But with the G12A family, the USB complex was correctly understood and implemented correctly. But seems the G12A architecture was derived for the GXL USB architecture, with minor differences and looks we can share most of the USB DWC3 glue driver. This patchset refactors and adds callbacks to handle the architecture difference while keeping the main code shared. The main difference is that on GXL/GXM the USB2 PHY control registers are mixed with the PHY registers (we already handle correctly), and the GLUE registers are allmost (99%) the same as G12A. But, the GXL/GXM HW is buggy, here are the quirks : - for the DWC2 controller to reset correctly, the GLUE mux must be switched to peripheral when the DWC2 controller probes. For now it's handled by simply switching to device when probing the subnodes, but it may be not enough - when manually switching from Host to Device when the USB port is not populated (should not happen with proper Micro-USB/USB-C OTG switch), it makes the DWC3 to crash. The only way to avoid that is to use the Host Disconnect bit to disconnect the DWC3 controller from the port, but we can't recover the Host functionnality unless resetting the DWC3 controller. This bit is set when only manual switch is done, and a warning is printed on manual switching. The patches 1-9 should be applied first, then either waiting the next release or if the usb maintainer can provide us a stable tag, we can use it to merge the DT and bindings. Changes since v1 at [1]: - Fixed DT bindings to take in account usb2-phy2 on GXM - Added comment in patch2 - Fixed patch 5 and moved fix out - Collected tags - Lower DT patch changes, switch p20x-q20x port B as OTG by default [1] http://lkml.kernel.org/r/20200324102030.31000-1-narmstrong@baylibre.com Martin Blumenstingl (4): arm64: dts: amlogic: use the new USB control driver for GXL and GXM phy: amlogic: meson-gxl-usb3: remove code for non-existing PHY usb: dwc3: of-simple: remove Amlogic GXL and AXG compatibles dt-bindings: usb: dwc3: remove old DWC3 wrapper Neil Armstrong (10): dt-bindings: usb: amlogic,meson-g12a-usb-ctrl: add the Amlogic GXL and GXM Families USB Glue Bindings usb: dwc3: meson-g12a: specify phy names in soc data usb: dwc3: meson-g12a: handle the phy and glue registers separately usb: dwc3: meson-g12a: get the reset as shared usb: dwc3: meson-g12a: check return of dwc3_meson_g12a_usb_init usb: dwc3: meson-g12a: refactor usb2 phy init usb: dwc3: meson-g12a: refactor usb init usb: dwc3: meson-g12a: support the GXL/GXM DWC3 host phy disconnect usb: dwc3: meson-g12a: add support for GXL and GXM SoCs doc: dt: bindings: usb: dwc3: remove amlogic compatible entries .../bindings/phy/meson-gxl-usb3-phy.txt | 31 -- .../devicetree/bindings/usb/amlogic,dwc3.txt | 42 -- .../usb/amlogic,meson-g12a-usb-ctrl.yaml | 73 ++- .../devicetree/bindings/usb/dwc3.txt | 2 - .../dts/amlogic/meson-gx-libretech-pc.dtsi | 3 +- .../boot/dts/amlogic/meson-gx-p23x-q20x.dtsi | 3 +- .../amlogic/meson-gxl-s805x-libretech-ac.dts | 3 +- .../boot/dts/amlogic/meson-gxl-s805x-p241.dts | 3 +- .../amlogic/meson-gxl-s905d-phicomm-n1.dts | 4 + .../boot/dts/amlogic/meson-gxl-s905w-p281.dts | 4 + .../dts/amlogic/meson-gxl-s905w-tx3-mini.dts | 4 + .../amlogic/meson-gxl-s905x-khadas-vim.dts | 4 + .../amlogic/meson-gxl-s905x-libretech-cc.dts | 3 +- .../amlogic/meson-gxl-s905x-nexbox-a95x.dts | 3 +- .../dts/amlogic/meson-gxl-s905x-p212.dtsi | 3 +- arch/arm64/boot/dts/amlogic/meson-gxl.dtsi | 45 +- .../dts/amlogic/meson-gxm-khadas-vim2.dts | 3 +- .../boot/dts/amlogic/meson-gxm-nexbox-a1.dts | 3 +- .../boot/dts/amlogic/meson-gxm-vega-s96.dts | 4 + arch/arm64/boot/dts/amlogic/meson-gxm.dtsi | 7 +- drivers/phy/amlogic/Kconfig | 12 - drivers/phy/amlogic/Makefile | 1 - drivers/phy/amlogic/phy-meson-gxl-usb3.c | 283 ------------ drivers/usb/dwc3/dwc3-meson-g12a.c | 415 ++++++++++++++---- drivers/usb/dwc3/dwc3-of-simple.c | 30 +- 25 files changed, 477 insertions(+), 511 deletions(-) delete mode 100644 Documentation/devicetree/bindings/phy/meson-gxl-usb3-phy.txt delete mode 100644 Documentation/devicetree/bindings/usb/amlogic,dwc3.txt delete mode 100644 drivers/phy/amlogic/phy-meson-gxl-usb3.c