Hello, I was a bit surprised to see that hot-plugging USB devices on Amlogic Meson8b (for example: Odroid-C1) is broken. to be fair: I *think* it worked before, but I cannot guarantee it nor can I say when it broke all examples below are from an Odroid-C1 board with Amlogic Meson8b (S805) SoC. this connects a (fixed, soldered down) 4-port USB hub to the dwc2 controller (which is in "host" mode) during boot I see: [ 1.651687] dwc2 c90c0000.usb: c90c0000.usb supply vusb_d not found, using dummy regulator [ 1.654434] dwc2 c90c0000.usb: c90c0000.usb supply vusb_a not found, using dummy regulator [ 1.732374] dwc2 c90c0000.usb: dwc2_check_params: Invalid parameter lpm=1 [ 1.733526] dwc2 c90c0000.usb: dwc2_check_params: Invalid parameter lpm_clock_gating=1 [ 1.741427] dwc2 c90c0000.usb: dwc2_check_params: Invalid parameter besl=1 [ 1.748305] dwc2 c90c0000.usb: dwc2_check_params: Invalid parameter hird_threshold_en=1 [ 1.756491] dwc2 c90c0000.usb: DWC OTG Controller [ 1.760993] dwc2 c90c0000.usb: new USB bus registered, assigned bus number 1 [ 1.768046] dwc2 c90c0000.usb: irq 24, io mem 0xc90c0000 [ 1.773947] hub 1-0:1.0: USB hub found [ 1.777063] hub 1-0:1.0: 1 port detected ... [ 2.212432] usb 1-1: new high-speed USB device number 2 using dwc2 [ 2.464742] hub 1-1:1.0: USB hub found [ 2.465118] hub 1-1:1.0: 4 ports detected if a USB device is plugged into one of the four USB ports during boot then it is detected automatically. if I plug in devices later they are not detected automatically (I have to run "lsusb -v" due to some reason, then hot-plugged devices are being detected) un-plugging USB devices is recognized instantly (no "lsusb" trickery is required) is this a known issue? how can I help debugging? any help is appreciated! below is the output of all dwc2 debugfs files. Regards Martin [rootodroidc1 c90c0000.usb]# cat dr_mode host [rootodroidc1 c90c0000.usb]# cat fifo Non-periodic FIFOs: RXFIFO: Size 0 NPTXFIFO: Size 0, Start 0x00000000 Periodic TXFIFOs: [rootodroidc1 c90c0000.usb]# cat hw_params op_mode : 5 arch : 2 dma_desc_enable : 1 enable_dynamic_fifo : 1 en_multiple_tx_fifo : 0 rx_fifo_size : 2048 host_nperio_tx_fifo_size : 2048 dev_nperio_tx_fifo_size : 0 host_perio_tx_fifo_size : 2048 nperio_tx_q_depth : 4 host_perio_tx_q_depth : 4 dev_token_q_depth : 8 max_transfer_size : 524287 max_packet_count : 1023 host_channels : 16 hs_phy_type : 1 fs_phy_type : 0 i2c_enable : 0 num_dev_ep : 2 num_dev_perio_in_ep : 0 total_fifo_size : 1984 power_optimized : 1 utmi_phy_data_width : 1 snpsid : 0x4f54310a dev_ep_dirs : 0x0 [rootodroidc1 c90c0000.usb]# cat params otg_cap : 2 dma_desc_enable : 0 dma_desc_fs_enable : 0 speed : 0 enable_dynamic_fifo : 1 en_multiple_tx_fifo : 0 host_rx_fifo_size : 512 host_nperio_tx_fifo_size : 500 host_perio_tx_fifo_size : 500 max_transfer_size : 524287 max_packet_count : 1023 host_channels : 16 phy_type : 1 phy_utmi_width : 16 phy_ulpi_ddr : 0 phy_ulpi_ext_vbus : 0 i2c_enable : 0 ulpi_fs_ls : 0 host_support_fs_ls_low_power : 0 host_ls_low_power_phy_clk : 0 ts_dline : 0 reload_ctl : 1 ahbcfg : 0xa uframe_sched : 0 external_id_pin_ctl : 0 power_down : 1 lpm : 0 lpm_clock_gating : 0 besl : 0 hird_threshold_en : 0 hird_threshold : 4 host_dma : 1 g_dma : 0 g_dma_desc : 0 g_rx_fifo_size : 0 g_np_tx_fifo_size : 0 g_tx_fifo_size[0] : 0 g_tx_fifo_size[1] : 0 g_tx_fifo_size[2] : 0 g_tx_fifo_size[3] : 0 g_tx_fifo_size[4] : 0 g_tx_fifo_size[5] : 0 g_tx_fifo_size[6] : 0 g_tx_fifo_size[7] : 0 g_tx_fifo_size[8] : 0 g_tx_fifo_size[9] : 0 g_tx_fifo_size[10] : 0 g_tx_fifo_size[11] : 0 g_tx_fifo_size[12] : 0 g_tx_fifo_size[13] : 0 g_tx_fifo_size[14] : 0 g_tx_fifo_size[15] : 0 [rootodroidc1 c90c0000.usb]# cat state DCFG=0x00000000, DCTL=0x00000000, DSTS=0x00000000 DIEPMSK=0x00000000, DOEPMASK=0x00000000 GINTMSK=0xf0000000, GINTSTS=0x00000001 DAINTMSK=0x00000000, DAINT=0x00000000 GNPTXSTS=0x00000000, GRXSTSR=00000000 Endpoint status: [rootodroidc1 c90c0000.usb]# cat testmode no test [rootodroidc1 c90c0000.usb]# cat regdump <system hangs> -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
