Hi Peter,
thank you a lot for your answere. This problem gives me headache for about 2 weeks now.
I have to admit that I'm not very experienced in working with embedded devices and it took me about one day to find ways to answere your questions. :)
I hope I've answered them. If not, please let me know. Maybe give some hint then about how to find out what you want to know. :)
On 24 February 2018 4:25 AM, Peter Chen <hzpeterchen@xxxxxxxxx> wrote:
> Ok, your problem is probably some powers are off and affect the USB vbus
> or dp/dm signals, and these powers are only off at mem state. Would you
> please check if LDO_2P5 is here
> - LDO_2P5, it affects vbus comparator
> - VBUS: please make sure vbus is there for ci_hdrc.1 port, since I see
> there is a device on the port, maybe a hub?
I think (but am not 100% sure) the VDO_2P5 is here:
find / -name '*2p5*'
/sys/kernel/debug/regulator/20c8000.anatop:regulator-2p5-vdd2p5
/sys/devices/soc0/soc/2000000.aips-bus/20c8000.anatop/20c8000.anatop:regulator-2p5
/sys/firmware/devicetree/base/soc/aips-bus@02000000/anatop@020c8000/regulator-2p5
/sys/bus/platform/devices/20c8000.anatop:regulator-2p5
/sys/bus/platform/drivers/anatop_regulator/20c8000.anatop:regulator-2p5
pwd
/sys/kernel/debug/regulator/20c8000.anatop:regulator-2p5-vdd2p5
ls -l
-r--r--r-- 1 root root 0 Jan 1 1970 bypass_count
-r--r--r-- 1 root root 0 Jan 1 1970 open_count
-r--r--r-- 1 root root 0 Jan 1 1970 use_count
cat *
0
0
0
pwd
/sys/devices/soc0/soc/2000000.aips-bus/20c8000.anatop/20c8000.anatop:regulator-2p5
ls -l
lrwxrwxrwx 1 root root 0 Feb 26 17:16 driver -> ../../../../../../bus/platform/drivers/anatop_regulator
-rw-r--r-- 1 root root 4096 Feb 26 17:16 driver_override
-r--r--r-- 1 root root 4096 Feb 26 17:16 modalias
lrwxrwxrwx 1 root root 0 Feb 26 17:16 of_node -> ../../../../../../firmware/devicetree/base/soc/aips-bus@02000000/anatop@020c8000/regulator-2p5
drwxr-xr-x 2 root root 0 Feb 26 17:16 power
drwxr-xr-x 3 root root 0 Feb 26 14:16 regulator
lrwxrwxrwx 1 root root 0 Feb 26 17:16 subsystem -> ../../../../../../bus/platform
-rw-r--r-- 1 root root 4096 Feb 26 14:16 uevent
/sys/devices/soc0/soc/2000000.aips-bus/20c8000.anatop/20c8000.anatop:regulator-2p5/regulator/regulator.3/max_microvolts: 2750000
/sys/devices/soc0/soc/2000000.aips-bus/20c8000.anatop/20c8000.anatop:regulator-2p5/regulator/regulator.3/microvolts: 2400000
And the nice tool devregs returns:
0x020c8130=0x00021073
0x020c8134=0x00021073
0x020c8138=0x00021073
0x020c813c=0x00021073
If I interpret this correct (and LSB is Bit no. 0), I think the register also says that the VDO_2P5 is here:
"0" "ENABLE_LINREG" "Control bit to enable the regulator output." [1, p4525f]
But I'm confused a little because Bit17=1:
"17" "OK_VDD2P5" "Status bit that signals when the regulator output is ok. 1 = regulator output > brownout target"
Now about the VBUS:
I think it is missing because I can only find it in dummy directories for 2184200.
find / -name '*vbus*'
/sys/kernel/debug/regulator/reg-dummy-regulator-dummy/2184200.usb-vbus
/sys/devices/platform/reg-dummy/regulator/regulator.0/2184200.usb-vbus
/sys/devices/soc0/supplies/supplies:otgvbus
/sys/firmware/devicetree/base/soc/aips-bus@02100000/usb@02184000/vbus-supply
/sys/firmware/devicetree/base/supplies/otgvbus
/sys/bus/platform/devices/supplies:otgvbus
/sys/bus/platform/drivers/reg-fixed-voltage/supplies:otgvbus
I hope this is the correct way of checking whether VBUS is here for ci_hdrc.1.
And about the device on the port:
Plugging in a device creates a folder in /sys/devices/soc0/soc/2100000.aips-bus/2184200.usb/ci_hdrc.1/usb1/1-1/
called 1-1.1, 1-1.2 or 1-1.3 (for USB-Ports 1, 2 and 3).
I think our board supplier attached an usb hub to the cpu's usb interface located at 2184200.
(And the carrier board's manual confirms this: "All USB Host interfaces are driven by a 4-port USB Hub which is located on the Avari." [2, p13])
Is this a problem for the wakeup? There is a 4th port I've never used, because it's Mini-USB.
> Would you please show me your kernel version?
Of course.
uname --all
Linux emtrion-mx6 4.9.7emtrion-mx6 #1 SMP PREEMPT Fri Jan 26 18:33:35 CET 2018 armv7l GNU/Linux
Best regards,
Ralf
[1] i.MX 6Solo/6DualLite Applications Processor Reference Manual, Rev. 3, 09/2017 (IMX6SDLRM.pdf) (https://imxdev.gitlab.io/imxdoc/reference-manual-imx6/)
[2] emCON_Avari, emCON compliant baseboard, Hardware Description, Rev3 / 25.10.2016 (emCON_Avari_HW_v003en.pdf) (https://www.emtrion.de/de/details_products-accessoires/emcon-mx6-57.html)
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