Messages in this thread | | | Date | Thu, 19 May 2022 18:04:33 +0800 | Subject | Re: [PATCH v4 0/2] ARM: sun8i-r40: Enable usb otg support | From | qianfan <> |
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在 2022/5/18 18:17, qianfanguijin@163.com 写道: > From: qianfan Zhao <qianfanguijin@163.com> > > History: > ======= > > v4(2022-05-18): > - Enable both musb and OHCI/EHCI support > > Tests: > ====== > > All test cases were tested on bananapi-m2-ultra. > > 1. USB DEVICE(ping test) > > Enable usb gadget rndis network, ping m2u on ubuntu host: > > ➜ ~ ping 192.168.200.2 > PING 192.168.200.2 (192.168.200.2) 56(84) bytes of data. > 64 bytes from 192.168.200.2: icmp_seq=1 ttl=64 time=0.544 ms > 64 bytes from 192.168.200.2: icmp_seq=2 ttl=64 time=0.269 ms > 64 bytes from 192.168.200.2: icmp_seq=3 ttl=64 time=0.300 ms > 64 bytes from 192.168.200.2: icmp_seq=4 ttl=64 time=0.295 ms > 64 bytes from 192.168.200.2: icmp_seq=5 ttl=64 time=0.283 ms > 64 bytes from 192.168.200.2: icmp_seq=6 ttl=64 time=0.226 ms > 64 bytes from 192.168.200.2: icmp_seq=7 ttl=64 time=0.246 ms > 64 bytes from 192.168.200.2: icmp_seq=8 ttl=64 time=0.204 ms > 64 bytes from 192.168.200.2: icmp_seq=9 ttl=64 time=0.302 ms > 64 bytes from 192.168.200.2: icmp_seq=10 ttl=64 time=0.249 ms > 64 bytes from 192.168.200.2: icmp_seq=11 ttl=64 time=0.459 ms > 64 bytes from 192.168.200.2: icmp_seq=12 ttl=64 time=0.232 ms > 64 bytes from 192.168.200.2: icmp_seq=13 ttl=64 time=0.275 ms > 64 bytes from 192.168.200.2: icmp_seq=14 ttl=64 time=0.243 ms > > 2. USB HOST(OHCI) > > Connect an usb serial port on OTG port, nex t is the kernel log: > > [ 27.824137] usb 2-1: new full-speed USB device number 2 using ohci-platform > [ 28.865504] cdc_acm 2-1:1.0: ttyACM0: USB ACM device > [ 29.565509] cdc_acm 2-1:1.2: ttyACM1: USB ACM device > > 3. USB HOST(EHCI) > > Connect an usb storage on OTG port, next is the kernel log: > > [ 17.754147] usb 1-1: new high-speed USB device number 2 using ehci-platform > [ 17.955995] usb-storage 1-1:1.0: USB Mass Storage device detected > [ 18.024497] scsi host1: usb-storage 1-1:1.0 > [ 19.035091] scsi 1:0:0:0: Direct-Access General USB Flash Disk 1.0 PQ: 0 ANSI: 2 > [ 19.049717] sd 1:0:0:0: [sda] 7831552 512-byte logical blocks: (4.01 GB/3.73 GiB) > [ 19.060873] sd 1:0:0:0: [sda] Write Protect is off > [ 19.071018] sd 1:0:0:0: [sda] No Caching mode page found > [ 19.076437] sd 1:0:0:0: [sda] Assuming drive cache: write through > [ 19.093566] sda: sda1 > [ 19.103492] sd 1:0:0:0: [sda] Attached SCSI removable disk > > issues: > ======= > > The system power often turned off when I plugged an usb device into the OTG port. > It's not clear why. It is not caused by software.
According to the schematic of M2U, there is a 100uF capacitor on the USBVBUS, but noting on ACIN. The board is powered by ACIN when I test usb otg, plugged an usb storage into the otg port, USB0 enter host mode and will enable the USBVBUS power supply through N_VBUSEN. At this time due to the limits of ACIN, the input voltage dropped and AXP enter shutdown protection state.
This problem was sloved when I mounted a large capacitor on ACIN. Both usb device and host stack can work fine now. > > qianfan Zhao (2): > ARM: dts: sun8i-r40: Add USB0_OTG/HOST support > ARM: dts: bananapi-m2-ultra: Enable USB0_OTG and HOST support > > .../boot/dts/sun8i-r40-bananapi-m2-ultra.dts | 39 +++++++++++++++++++ > arch/arm/boot/dts/sun8i-r40.dtsi | 34 ++++++++++++++++ > 2 files changed, 73 insertions(+) >
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