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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 | ||
764763f0 | 6 | 1.1 How to enable OTG FSM |
9159e049 | 7 | --------------------------------------- |
764763f0 PC |
8 | 1.1.1 Select CONFIG_USB_OTG_FSM in menuconfig, rebuild kernel |
9 | Image and modules. If you want to check some internal | |
10 | variables for otg fsm, mount debugfs, there are 2 files | |
11 | which can show otg fsm variables and some controller registers value: | |
9159e049 LJ |
12 | cat /sys/kernel/debug/ci_hdrc.0/otg |
13 | cat /sys/kernel/debug/ci_hdrc.0/registers | |
764763f0 PC |
14 | 1.1.2 Add below entries in your dts file for your controller node |
15 | otg-rev = <0x0200>; | |
16 | adp-disable; | |
9159e049 LJ |
17 | |
18 | 1.2 Test operations | |
19 | ------------------- | |
20 | 1) Power up 2 Freescale i.MX6Q sabre SD boards with gadget class driver loaded | |
21 | (e.g. g_mass_storage). | |
22 | ||
23 | 2) Connect 2 boards with usb cable with one end is micro A plug, the other end | |
24 | is micro B plug. | |
25 | ||
26 | The A-device(with micro A plug inserted) should enumrate B-device. | |
27 | ||
28 | 3) Role switch | |
29 | On B-device: | |
30 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
31 | ||
9159e049 LJ |
32 | B-device should take host role and enumrate A-device. |
33 | ||
34 | 4) A-device switch back to host. | |
35 | On B-device: | |
36 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
37 | ||
dfbae330 LJ |
38 | or, by introducing HNP polling, B-Host can know when A-peripheral wish |
39 | to be host role, so this role switch also can be trigged in A-peripheral | |
40 | side by answering the polling from B-Host, this can be done on A-device: | |
41 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
42 | ||
9159e049 LJ |
43 | A-device should switch back to host and enumrate B-device. |
44 | ||
45 | 5) Remove B-device(unplug micro B plug) and insert again in 10 seconds, | |
46 | A-device should enumrate B-device again. | |
47 | ||
48 | 6) Remove B-device(unplug micro B plug) and insert again after 10 seconds, | |
49 | A-device should NOT enumrate B-device. | |
50 | ||
51 | if A-device wants to use bus: | |
52 | On A-device: | |
53 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
54 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
55 | ||
56 | if B-device wants to use bus: | |
57 | On B-device: | |
58 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
59 | ||
60 | 7) A-device power down the bus. | |
61 | On A-device: | |
62 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
63 | ||
64 | A-device should disconnect with B-device and power down the bus. | |
65 | ||
66 | 8) B-device does data pulse for SRP. | |
67 | On B-device: | |
68 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
69 | ||
70 | A-device should resume usb bus and enumrate B-device. | |
71 | ||
72 | 1.3 Reference document | |
73 | ---------------------- | |
74 | "On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification | |
75 | July 27, 2012 Revision 2.0 version 1.1a" | |
01e3ad86 PC |
76 | |
77 | 2. How to enable USB as system wakeup source | |
78 | ----------------------------------- | |
79 | Below is the example for how to enable USB as system wakeup source | |
80 | at imx6 platform. | |
81 | ||
82 | 2.1 Enable core's wakeup | |
83 | echo enabled > /sys/bus/platform/devices/ci_hdrc.0/power/wakeup | |
84 | 2.2 Enable glue layer's wakeup | |
85 | echo enabled > /sys/bus/platform/devices/2184000.usb/power/wakeup | |
86 | 2.3 Enable PHY's wakeup (optional) | |
87 | echo enabled > /sys/bus/platform/devices/20c9000.usbphy/power/wakeup | |
88 | 2.4 Enable roothub's wakeup | |
89 | echo enabled > /sys/bus/usb/devices/usb1/power/wakeup | |
90 | 2.5 Enable related device's wakeup | |
91 | echo enabled > /sys/bus/usb/devices/1-1/power/wakeup | |
92 | ||
93 | If the system has only one usb port, and you want usb wakeup at this port, you | |
94 | can use below script to enable usb wakeup. | |
95 | for i in $(find /sys -name wakeup | grep usb);do echo enabled > $i;done; | |
96 |