Hi, I'm currently working on s2idle support for Raspberry Pi 3B+ (BCM43455 SDIO). During the tests with I noticed harmless, but annoying error messages from brcmfmac like this: [ 383.186640] PM: suspend entry (s2idle) [ 383.190107] Filesystems sync: 0.003 seconds [ 383.247470] Freezing user space processes [ 383.250291] Freezing user space processes completed (elapsed 0.002 seconds) [ 383.250379] OOM killer disabled. [ 383.250385] Freezing remaining freezable tasks [ 383.251677] Freezing remaining freezable tasks completed (elapsed 0.001 seconds) [ 384.292071] ieee80211 phy0: brcmf_fil_cmd_data: bus is down. we have nothing to do. [ 384.292079] ieee80211 phy0: brcmf_cfg80211_get_tx_power: error (-5) These errors are not new and I assume they have always been there. I'm not an expert here, so I want to know is the problem here that the SDIO interface is shutdown before brcmfmac is suspended or lies the issue within brcmfmac suspend itself? Here is a calltrace for the error above: [ 384.291308] brcmf_fil_cmd_data+0xe0/0x114 [brcmfmac] (P) [ 384.291347] brcmf_fil_iovar_data_get+0xcc/0x134 [brcmfmac] (L) [ 384.291384] brcmf_fil_iovar_data_get+0xcc/0x134 [brcmfmac] [ 384.291420] brcmf_cfg80211_get_tx_power+0x58/0xd4 [brcmfmac] [ 384.291458] nl80211_send_iface+0x1e8/0x584 [cfg80211] [ 384.291549] nl80211_notify_iface+0x58/0xd4 [cfg80211] [ 384.291615] _cfg80211_unregister_wdev+0x40/0x27c [cfg80211] [ 384.291682] cfg80211_unregister_wdev+0x14/0x20 [cfg80211] [ 384.291748] brcmf_p2p_ifp_removed+0x6c/0x98 [brcmfmac] [ 384.291785] brcmf_remove_interface+0x170/0x1ec [brcmfmac] [ 384.291822] brcmf_detach+0x60/0xfc [brcmfmac] [ 384.291859] brcmf_sdio_remove+0x4c/0x188 [brcmfmac] [ 384.291896] brcmf_sdiod_remove+0x24/0xa4 [brcmfmac] [ 384.291933] brcmf_ops_sdio_suspend+0x100/0x1c8 [brcmfmac] [ 384.291971] pm_generic_suspend+0x2c/0x44 [ 384.291982] dpm_run_callback.constprop.0+0x74/0x134 [ 384.291993] device_suspend+0x110/0x3d0 [ 384.292002] async_suspend+0x24/0x3c [ 384.292012] async_run_entry_fn+0x34/0xe0 [ 384.292022] process_one_work+0x150/0x294 [ 384.292032] worker_thread+0x2dc/0x3dc [ 384.292041] kthread+0x118/0x11c [ 384.292049] ret_from_fork+0x10/0x20 Best regards
