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133 lines
3.7 KiB
133 lines
3.7 KiB
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ChipIdea Highspeed Dual Role Controller Driver |
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1. How to test OTG FSM(HNP and SRP) |
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----------------------------------- |
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To show how to demo OTG HNP and SRP functions via sys input files |
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with 2 Freescale i.MX6Q sabre SD boards. |
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1.1 How to enable OTG FSM |
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------------------------- |
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1.1.1 Select CONFIG_USB_OTG_FSM in menuconfig, rebuild kernel |
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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Image and modules. If you want to check some internal |
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variables for otg fsm, mount debugfs, there are 2 files |
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which can show otg fsm variables and some controller registers value:: |
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cat /sys/kernel/debug/ci_hdrc.0/otg |
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cat /sys/kernel/debug/ci_hdrc.0/registers |
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1.1.2 Add below entries in your dts file for your controller node |
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
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:: |
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otg-rev = <0x0200>; |
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adp-disable; |
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1.2 Test operations |
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------------------- |
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1) Power up 2 Freescale i.MX6Q sabre SD boards with gadget class driver loaded |
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(e.g. g_mass_storage). |
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2) Connect 2 boards with usb cable with one end is micro A plug, the other end |
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is micro B plug. |
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The A-device(with micro A plug inserted) should enumerate B-device. |
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3) Role switch |
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On B-device:: |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req |
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B-device should take host role and enumerate A-device. |
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4) A-device switch back to host. |
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On B-device:: |
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echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req |
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or, by introducing HNP polling, B-Host can know when A-peripheral wish |
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to be host role, so this role switch also can be trigged in A-peripheral |
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side by answering the polling from B-Host, this can be done on A-device:: |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req |
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A-device should switch back to host and enumerate B-device. |
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5) Remove B-device(unplug micro B plug) and insert again in 10 seconds, |
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A-device should enumerate B-device again. |
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6) Remove B-device(unplug micro B plug) and insert again after 10 seconds, |
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A-device should NOT enumerate B-device. |
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if A-device wants to use bus: |
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On A-device:: |
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echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req |
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if B-device wants to use bus: |
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On B-device:: |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req |
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7) A-device power down the bus. |
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On A-device:: |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop |
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A-device should disconnect with B-device and power down the bus. |
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8) B-device does data pulse for SRP. |
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On B-device:: |
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echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req |
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A-device should resume usb bus and enumerate B-device. |
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1.3 Reference document |
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---------------------- |
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"On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification |
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July 27, 2012 Revision 2.0 version 1.1a" |
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2. How to enable USB as system wakeup source |
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-------------------------------------------- |
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Below is the example for how to enable USB as system wakeup source |
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at imx6 platform. |
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2.1 Enable core's wakeup:: |
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echo enabled > /sys/bus/platform/devices/ci_hdrc.0/power/wakeup |
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2.2 Enable glue layer's wakeup:: |
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echo enabled > /sys/bus/platform/devices/2184000.usb/power/wakeup |
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2.3 Enable PHY's wakeup (optional):: |
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echo enabled > /sys/bus/platform/devices/20c9000.usbphy/power/wakeup |
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2.4 Enable roothub's wakeup:: |
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echo enabled > /sys/bus/usb/devices/usb1/power/wakeup |
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2.5 Enable related device's wakeup:: |
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echo enabled > /sys/bus/usb/devices/1-1/power/wakeup |
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If the system has only one usb port, and you want usb wakeup at this port, you |
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can use below script to enable usb wakeup:: |
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for i in $(find /sys -name wakeup | grep usb);do echo enabled > $i;done;
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