projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 9159e049 LJ |
1 | 1. How to test OTG FSM(HNP and SRP) |
| 2 | ----------------------------------- | |
| 3 | To show how to demo OTG HNP and SRP functions via sys input files | |
| 4 | with 2 Freescale i.MX6Q sabre SD boards. | |
| 5 | ||
| 6 | 1.1 How to enable OTG FSM in menuconfig | |
| 7 | --------------------------------------- | |
| ec447ab1 | 8 | Select CONFIG_USB_OTG_FSM, rebuild kernel Image and modules. |
| 9159e049 LJ |
9 | If you want to check some internal variables for otg fsm, |
| 10 | select CONFIG_USB_CHIPIDEA_DEBUG, there are 2 files which | |
| 11 | can show otg fsm variables and some controller registers value: | |
| 12 | cat /sys/kernel/debug/ci_hdrc.0/otg | |
| 13 | cat /sys/kernel/debug/ci_hdrc.0/registers | |
| 14 | ||
| 15 | 1.2 Test operations | |
| 16 | ------------------- | |
| 17 | 1) Power up 2 Freescale i.MX6Q sabre SD boards with gadget class driver loaded | |
| 18 | (e.g. g_mass_storage). | |
| 19 | ||
| 20 | 2) Connect 2 boards with usb cable with one end is micro A plug, the other end | |
| 21 | is micro B plug. | |
| 22 | ||
| 23 | The A-device(with micro A plug inserted) should enumrate B-device. | |
| 24 | ||
| 25 | 3) Role switch | |
| 26 | On B-device: | |
| 27 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
| 28 | ||
| 29 | if HNP polling is not supported, also need: | |
| 30 | On A-device: | |
| 31 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
| 32 | ||
| 33 | B-device should take host role and enumrate A-device. | |
| 34 | ||
| 35 | 4) A-device switch back to host. | |
| 36 | On B-device: | |
| 37 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
| 38 | ||
| 39 | A-device should switch back to host and enumrate B-device. | |
| 40 | ||
| 41 | 5) Remove B-device(unplug micro B plug) and insert again in 10 seconds, | |
| 42 | A-device should enumrate B-device again. | |
| 43 | ||
| 44 | 6) Remove B-device(unplug micro B plug) and insert again after 10 seconds, | |
| 45 | A-device should NOT enumrate B-device. | |
| 46 | ||
| 47 | if A-device wants to use bus: | |
| 48 | On A-device: | |
| 49 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
| 50 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
| 51 | ||
| 52 | if B-device wants to use bus: | |
| 53 | On B-device: | |
| 54 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
| 55 | ||
| 56 | 7) A-device power down the bus. | |
| 57 | On A-device: | |
| 58 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
| 59 | ||
| 60 | A-device should disconnect with B-device and power down the bus. | |
| 61 | ||
| 62 | 8) B-device does data pulse for SRP. | |
| 63 | On B-device: | |
| 64 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
| 65 | ||
| 66 | A-device should resume usb bus and enumrate B-device. | |
| 67 | ||
| 68 | 1.3 Reference document | |
| 69 | ---------------------- | |
| 70 | "On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification | |
| 71 | July 27, 2012 Revision 2.0 version 1.1a" | |
| 01e3ad86 PC |
72 | |
| 73 | 2. How to enable USB as system wakeup source | |
| 74 | ----------------------------------- | |
| 75 | Below is the example for how to enable USB as system wakeup source | |
| 76 | at imx6 platform. | |
| 77 | ||
| 78 | 2.1 Enable core's wakeup | |
| 79 | echo enabled > /sys/bus/platform/devices/ci_hdrc.0/power/wakeup | |
| 80 | 2.2 Enable glue layer's wakeup | |
| 81 | echo enabled > /sys/bus/platform/devices/2184000.usb/power/wakeup | |
| 82 | 2.3 Enable PHY's wakeup (optional) | |
| 83 | echo enabled > /sys/bus/platform/devices/20c9000.usbphy/power/wakeup | |
| 84 | 2.4 Enable roothub's wakeup | |
| 85 | echo enabled > /sys/bus/usb/devices/usb1/power/wakeup | |
| 86 | 2.5 Enable related device's wakeup | |
| 87 | echo enabled > /sys/bus/usb/devices/1-1/power/wakeup | |
| 88 | ||
| 89 | If the system has only one usb port, and you want usb wakeup at this port, you | |
| 90 | can use below script to enable usb wakeup. | |
| 91 | for i in $(find /sys -name wakeup | grep usb);do echo enabled > $i;done; | |
| 92 |