Hi, i currently experiment with suspend to idle on the Raspberry Pi 3 A+. Supend & resume works expected as long as no USB device is connected to the board. If i connect a USB hub to the Pi, the resume phase is significantly delayed and the kernel disabled IRQ 66 which belongs to DWC2. Here are the steps to trigger this issue: - build kernel with multi_v7_defconfig - make sure necessary kernel options are enabled ( CONFIG_PM_DEBUG, CONFIG_PM_ADVANCED_DEBUG ) - make sure a USB hub is connected to Raspberry Pi 3 A Plus - Add "no_console_suspend" to cmdline.txt and reboot - Connect via Debug UART: echo 1 > /sys/power/pm_debug_messages echo platform > /sys/power/pm_test echo freeze > /sys/power/state Here is the relevant kernel log: [ 1108.402522] usb 1-1: new high-speed USB device number 2 using dwc2 [ 1108.655864] hub 1-1:1.0: USB hub found [ 1108.656029] hub 1-1:1.0: 4 ports detected [ 1117.932573] rpi_firmware_set_power: Set HDMI to 1 [ 1117.932709] rpi_firmware_set_power: Set HDMI to 0 [ 1123.282825] PM: suspend entry (s2idle) [ 1124.429959] Filesystems sync: 1.147 seconds [ 1124.442720] Freezing user space processes [ 1124.444205] Freezing user space processes completed (elapsed 0.001 seconds) [ 1124.444227] OOM killer disabled. [ 1124.444236] Freezing remaining freezable tasks [ 1124.445409] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) [ 1125.487258] ieee80211 phy1: brcmf_fil_cmd_data: bus is down. we have nothing to do. [ 1125.487284] ieee80211 phy1: brcmf_cfg80211_get_tx_power: error (-5) [ 1126.105119] PM: suspend of devices complete after 1658.658 msecs [ 1126.105147] PM: start suspend of devices complete after 1659.719 msecs [ 1126.106814] PM: late suspend of devices complete after 1.650 msecs [ 1126.107207] rpi_firmware_set_power: Set VEC to 0 [ 1126.107279] rpi_firmware_set_power: Set V3D to 0 [ 1126.108303] PM: noirq suspend of devices complete after 1.340 msecs [ 1126.108321] PM: suspend debug: Waiting for 5 second(s). [ 1131.109573] rpi_firmware_set_power: Set V3D to 1 [ 1131.109636] rpi_firmware_set_power: Set HDMI to 1 [ 1131.109692] rpi_firmware_set_power: Set VEC to 1 [ 1131.109745] rpi_firmware_set_power: Set USB to 1 [ 1131.109996] PM: noirq resume of devices complete after 1.273 msecs [ 1131.111208] PM: early resume of devices complete after 1.051 msecs [ 1131.230277] brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac43455-sdio for chip BCM4345/6 [ 1131.458687] irq 66: nobody cared (try booting with the "irqpoll" option) [ 1131.458714] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G W 6.10.0-rc3-g7fd4227d1bd5-dirty #49 [ 1131.458734] Hardware name: BCM2835 [ 1131.458744] Call trace: [ 1131.458757] unwind_backtrace from show_stack+0x10/0x14 [ 1131.458796] show_stack from dump_stack_lvl+0x50/0x64 [ 1131.458822] dump_stack_lvl from __report_bad_irq+0x38/0xc0 [ 1131.458848] __report_bad_irq from note_interrupt+0x2ac/0x2f4 [ 1131.458877] note_interrupt from handle_irq_event+0x88/0x8c [ 1131.458900] handle_irq_event from handle_level_irq+0xb4/0x1ac [ 1131.458923] handle_level_irq from generic_handle_domain_irq+0x24/0x34 [ 1131.458957] generic_handle_domain_irq from bcm2836_chained_handle_irq+0x24/0x28 [ 1131.458992] bcm2836_chained_handle_irq from generic_handle_domain_irq+0x24/0x34 [ 1131.459024] generic_handle_domain_irq from generic_handle_arch_irq+0x34/0x44 [ 1131.459056] generic_handle_arch_irq from __irq_svc+0x88/0xb0 [ 1131.459079] Exception stack(0xc1b01f20 to 0xc1b01f68) [ 1131.459100] 1f20: 0005c0d4 00000001 00000000 00000000 c1b09780 c1d6b32c c1b04e54 c1a5eae8 [ 1131.459118] 1f40: c1b04e90 00000000 00000000 00000000 c1d6a8a0 c1b01f70 c11d2da8 c11d4160 [ 1131.459130] 1f60: 60000013 ffffffff [ 1131.459142] __irq_svc from default_idle_call+0x1c/0xb0 [ 1131.459167] default_idle_call from do_idle+0x21c/0x284 [ 1131.459202] do_idle from cpu_startup_entry+0x28/0x2c [ 1131.459239] cpu_startup_entry from kernel_init+0x0/0x12c [ 1131.459271] handlers: [ 1131.459279] [<f539e0f4>] dwc2_handle_common_intr [ 1131.459308] [<75cd278b>] usb_hcd_irq [ 1131.459329] Disabling IRQ #66 [ 1131.487617] brcmfmac: brcmf_c_process_txcap_blob: no txcap_blob available (err=-2) [ 1131.488107] brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4345/6 wl0: Nov 1 2021 00:37:25 version 7.45.241 (1a2f2fa CY) FWID 01-703fd60 [ 1136.552601] usb 1-1: reset high-speed USB device number 2 using dwc2 [ 1141.832522] usb 1-1: device descriptor read/64, error -110 [ 1157.272527] usb 1-1: device descriptor read/64, error -110 [ 1157.612516] usb 1-1: reset high-speed USB device number 2 using dwc2 [ 1162.872518] usb 1-1: device descriptor read/64, error -110 [ 1178.312517] usb 1-1: device descriptor read/64, error -110 [ 1178.652516] usb 1-1: reset high-speed USB device number 2 using dwc2 [ 1189.192506] usb 1-1: device not accepting address 2, error -110 [ 1189.412512] usb 1-1: reset high-speed USB device number 2 using dwc2 [ 1199.992511] usb 1-1: device not accepting address 2, error -110 [ 1199.992768] PM: resume of devices complete after 68881.537 msecs [ 1199.994145] OOM killer enabled. [ 1199.994155] Restarting tasks ... [ 1199.994833] rpi_firmware_set_power: Set HDMI to 0 [ 1199.994892] usb 1-1: USB disconnect, device number 2 [ 1199.996456] done. [ 1199.996518] random: crng reseeded on system resumption [ 1200.014632] PM: suspend exit An ideas what causing this issue?
