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1 | ============================================== |
2 | ChipIdea Highspeed Dual Role Controller Driver | |
3 | ============================================== | |
4 | ||
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5 | 1. How to test OTG FSM(HNP and SRP) |
6 | ----------------------------------- | |
d80b5005 | 7 | |
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8 | To show how to demo OTG HNP and SRP functions via sys input files |
9 | with 2 Freescale i.MX6Q sabre SD boards. | |
10 | ||
764763f0 | 11 | 1.1 How to enable OTG FSM |
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12 | ------------------------- |
13 | ||
764763f0 | 14 | 1.1.1 Select CONFIG_USB_OTG_FSM in menuconfig, rebuild kernel |
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15 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
16 | ||
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17 | Image and modules. If you want to check some internal |
18 | variables for otg fsm, mount debugfs, there are 2 files | |
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19 | which can show otg fsm variables and some controller registers value:: |
20 | ||
21 | cat /sys/kernel/debug/ci_hdrc.0/otg | |
22 | cat /sys/kernel/debug/ci_hdrc.0/registers | |
23 | ||
764763f0 | 24 | 1.1.2 Add below entries in your dts file for your controller node |
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25 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ |
26 | ||
27 | :: | |
28 | ||
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29 | otg-rev = <0x0200>; |
30 | adp-disable; | |
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31 | |
32 | 1.2 Test operations | |
33 | ------------------- | |
d80b5005 | 34 | |
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35 | 1) Power up 2 Freescale i.MX6Q sabre SD boards with gadget class driver loaded |
36 | (e.g. g_mass_storage). | |
37 | ||
38 | 2) Connect 2 boards with usb cable with one end is micro A plug, the other end | |
39 | is micro B plug. | |
40 | ||
aa73f28e | 41 | The A-device(with micro A plug inserted) should enumerate B-device. |
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42 | |
43 | 3) Role switch | |
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44 | |
45 | On B-device:: | |
46 | ||
47 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
9159e049 | 48 | |
aa73f28e | 49 | B-device should take host role and enumerate A-device. |
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50 | |
51 | 4) A-device switch back to host. | |
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52 | |
53 | On B-device:: | |
54 | ||
55 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
9159e049 | 56 | |
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57 | or, by introducing HNP polling, B-Host can know when A-peripheral wish |
58 | to be host role, so this role switch also can be trigged in A-peripheral | |
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59 | side by answering the polling from B-Host, this can be done on A-device:: |
60 | ||
61 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
dfbae330 | 62 | |
aa73f28e | 63 | A-device should switch back to host and enumerate B-device. |
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64 | |
65 | 5) Remove B-device(unplug micro B plug) and insert again in 10 seconds, | |
aa73f28e | 66 | A-device should enumerate B-device again. |
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67 | |
68 | 6) Remove B-device(unplug micro B plug) and insert again after 10 seconds, | |
aa73f28e | 69 | A-device should NOT enumerate B-device. |
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70 | |
71 | if A-device wants to use bus: | |
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72 | |
73 | On A-device:: | |
74 | ||
75 | echo 0 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
76 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_req | |
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77 | |
78 | if B-device wants to use bus: | |
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79 | |
80 | On B-device:: | |
81 | ||
82 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
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83 | |
84 | 7) A-device power down the bus. | |
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85 | |
86 | On A-device:: | |
87 | ||
88 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/a_bus_drop | |
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89 | |
90 | A-device should disconnect with B-device and power down the bus. | |
91 | ||
92 | 8) B-device does data pulse for SRP. | |
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93 | |
94 | On B-device:: | |
95 | ||
96 | echo 1 > /sys/bus/platform/devices/ci_hdrc.0/inputs/b_bus_req | |
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aa73f28e | 98 | A-device should resume usb bus and enumerate B-device. |
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99 | |
100 | 1.3 Reference document | |
101 | ---------------------- | |
102 | "On-The-Go and Embedded Host Supplement to the USB Revision 2.0 Specification | |
103 | July 27, 2012 Revision 2.0 version 1.1a" | |
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104 | |
105 | 2. How to enable USB as system wakeup source | |
d80b5005 | 106 | -------------------------------------------- |
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107 | Below is the example for how to enable USB as system wakeup source |
108 | at imx6 platform. | |
109 | ||
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110 | 2.1 Enable core's wakeup:: |
111 | ||
112 | echo enabled > /sys/bus/platform/devices/ci_hdrc.0/power/wakeup | |
113 | ||
114 | 2.2 Enable glue layer's wakeup:: | |
115 | ||
116 | echo enabled > /sys/bus/platform/devices/2184000.usb/power/wakeup | |
117 | ||
118 | 2.3 Enable PHY's wakeup (optional):: | |
119 | ||
120 | echo enabled > /sys/bus/platform/devices/20c9000.usbphy/power/wakeup | |
121 | ||
122 | 2.4 Enable roothub's wakeup:: | |
123 | ||
124 | echo enabled > /sys/bus/usb/devices/usb1/power/wakeup | |
125 | ||
126 | 2.5 Enable related device's wakeup:: | |
127 | ||
128 | echo enabled > /sys/bus/usb/devices/1-1/power/wakeup | |
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129 | |
130 | If the system has only one usb port, and you want usb wakeup at this port, you | |
d80b5005 | 131 | can use below script to enable usb wakeup:: |
01e3ad86 | 132 | |
d80b5005 | 133 | for i in $(find /sys -name wakeup | grep usb);do echo enabled > $i;done; |