Message-ID: <1613993809.2331.12.camel@realtek.com>
Date:   Mon, 22 Feb 2021 11:36:51 +0000
From:   Pkshih <pkshih@...ltek.com>
To:     "kvalo@...eaurora.org" <kvalo@...eaurora.org>,
        "chenhaoa@...ontech.com" <chenhaoa@...ontech.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tony0620emma@...il.com" <tony0620emma@...il.com>,
        Timlee <timlee@...ltek.com>,
        "zhanjun@...ontech.com" <zhanjun@...ontech.com>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "arnd@...db.de" <arnd@...db.de>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
Subject: Re: [PATCH v2] rtw88: 8822ce: fix wifi disconnect after S3/S4 on HONOR laptop

On Mon, 2021-02-22 at 12:29 +0200, Kalle Valo wrote:
> Hao Chen <chenhaoa@...ontech.com> writes:
> 
> > The laptop's wifi disconnect after the laptop HONOR MagicBook 14
> > sleep to S3/S4 and wake up.
> >
> > The dmesg of kernel report:
> > "[   99.990168] pcieport 0000:00:01.2: can't change power state from D3hot
> > to D0 (config space inaccessible)
> > [   99.990176] ACPI: EC: interrupt unblocked
> > [   99.993334] rtw_pci 0000:01:00.0: can't change power state from D3hot
> > to D0 (config space inaccessible)
> > ......
> > [  102.133500] rtw_pci 0000:01:00.0: mac power on failed
> > [  102.133503] rtw_pci 0000:01:00.0: failed to power on mac
> > [  102.133505] ------------[ cut here ]------------
> > [  102.133506] Hardware became unavailable upon resume. This could be a
> > software issue prior to suspend or a hardware issue.
> > [  102.133569] WARNING: CPU: 4 PID: 5612 at net/mac80211/util.c:2232
> > ieee80211_reconfig+0x9b/0x1490 [mac80211]
> > [  102.133570] Modules linked in: ccm rfcomm uvcvideo videobuf2_vmalloc
> > videobuf2_memops videobuf2_v4l2 videobuf2_common videodev mc cmac bnep 
> > btusb btrtl btbcm btintel edac_mce_amd bluetooth kvm_amd ecdh_generic 
> > ecc kvm nls_iso8859_1 rtwpci rtw88 crct10dif_pclmul crc32_pclmul mac80211 
> > ghash_clmulni_intel aesni_intel snd_hda_codec_realtek crypto_simd huawei_wmi
> > snd_hda_codec_generic cryptd cfg80211 wmi_bmof serio_raw sparse_keymap
> > ledtrig_audio sp5100_tco glue_helper joydev snd_hda_codec_hdmi snd_hda_intel
> > snd_intel_dspcfg wdat_wdt snd_hda_codec snd_hda_core pcspkr snd_hwdep snd_pcm
> > efi_pstore snd_timer libarc4 k10temp snd soundcore snd_pci_acp3x ccp mac_hid
> > binfmt_misc ip_tables x_tables autofs4 amdgpu amd_iommu_v2 gpu_sched 
> > i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops
> > usbmouse cec nvme hid_generic i2c_piix4 usbhid nvme_core drm wmi video
> > [  102.133617] CPU: 4 PID: 5612 Comm: kworker/u32:16 Not tainted 5.7.7-amd64-desktop-8822 #3
> > [  102.133618] Hardware name: HUAWEI NBLL-WXX9/NBLL-WXX9-PCB, BIOS 1.06 09/29/2020
> > [  102.133623] Workqueue: events_unbound async_run_entry_fn
> > [  102.133651] RIP: 0010:ieee80211_reconfig+0x9b/0x1490 [mac80211]
> > [  102.133654] Code: 31 db e8 e8 fb 27 c2 41 c6 85 34 05 00 00 00 4c 89 ef e8 38
> > 56 fc ff 89 45 b8 85 c0 74 4c 48 c7 c7 d0 0c 09 c1 e8 01 e0 25 c2 <0f> 0b 4c
> > 89 ef e8 2b d1 ff ff e9 02 03 00 00 80 7d 9f 00 0f 85 1d
> > [  102.133655] RSP: 0018:ffffbe52c059fd08 EFLAGS: 00010286
> > [  102.133657] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000007
> > [  102.133658] RDX: 0000000000000007 RSI: 0000000000000096 RDI: ffff9d573f519cc0
> > [  102.133659] RBP: ffffbe52c059fd80 R08: ffffffffffd96245 R09: 000000000002cb80
> > [  102.133660] R10: 000000016989e54c R11: 000000000002a360 R12: ffff9d5731f50300
> > [  102.133661] R13: ffff9d5731f50800 R14: ffff9d5731f504c8 R15: ffffffff8463fbef
> > [  102.133664] FS:  0000000000000000(0000) GS:ffff9d573f500000(0000) knlGS:0000000000000000
> > [  102.133665] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [  102.133666] CR2: 0000000000000000 CR3: 000000033320a000 CR4: 0000000000340ee0
> > [  102.133667] Call Trace:
> > [  102.133673]  ? enqueue_entity+0xe3/0x680
> > [  102.133705]  ieee80211_resume+0x55/0x70 [mac80211]
> > [  102.133729]  wiphy_resume+0x84/0x130 [cfg80211]
> > [  102.133752]  ? addresses_show+0xa0/0xa0 [cfg80211]
> > [  102.133757]  dpm_run_callback+0x5b/0x150
> > [  102.133760]  device_resume+0xad/0x1f0
> > [  102.133762]  async_resume+0x1d/0x30
> > [  102.133764]  async_run_entry_fn+0x3e/0x170
> > [  102.133768]  process_one_work+0x1ab/0x380
> > [  102.133771]  worker_thread+0x37/0x3b0
> > [  102.133774]  kthread+0x120/0x140
> > [  102.133776]  ? create_worker+0x1b0/0x1b0
> > [  102.133778]  ? kthread_park+0x90/0x90
> > [  102.133782]  ret_from_fork+0x22/0x40
> > [  102.133785] ---[ end trace 46229bfd3a4273be ]---
> > [  102.134137] ------------[ cut here ]------------
> > [  102.134141] wlp1s0:  Failed check-sdata-in-driver check, flags: 0x0
> > [  102.134195] WARNING: CPU: 0 PID: 5612 at net/mac80211/driver-ops.h:19
> > drv_remove_interface+0xfe/0x110 [mac80211]"
> >
> > When try to pointer the driver.pm to NULL, the problem is fixed.
> > It makes the sleep and wake procedure expected when pm's ops not NULL.
> >
> > By `git blame` command, I know that the assignment of .driver.pm =
> > RTW_PM_OPS was in commit 44bc17f7f5b3 ("rtw88: support wowlan feature for
> > 8822c"), and another
> > commit 7dc7c41607d1 ("rtw88: avoid unused function warnings")
> > pointed out rtw_pci_resume() and rtw_pci_suspend() are not used at
> > all.
> >
> > So I think it's safe to remove them.
> >
> > Fixes: 7dc7c41607d1 ("rtw88: avoid unused function warnings")
> > Fixes: 44bc17f7f5b3 ("rtw88: support wowlan feature for 8822c")
> >
> > Signed-off-by: Hao Chen <chenhaoa@...ontech.com>
> > ---
> >  drivers/net/wireless/realtek/rtw88/rtw8822ce.c | 1 -
> >  1 file changed, 1 deletion(-)
> >
> > diff --git a/drivers/net/wireless/realtek/rtw88/rtw8822ce.c b/drivers/net/wireless/realtek/rtw88/rtw8822ce.c
> > index 3845b1333dc3..4c063192f801 100644
> > --- a/drivers/net/wireless/realtek/rtw88/rtw8822ce.c
> > +++ b/drivers/net/wireless/realtek/rtw88/rtw8822ce.c
> > @@ -25,7 +25,6 @@ static struct pci_driver rtw_8822ce_driver = {
> >  	.id_table = rtw_8822ce_id_table,
> >  	.probe = rtw_pci_probe,
> >  	.remove = rtw_pci_remove,
> > -	.driver.pm = &rtw_pm_ops,
> 
> Why just 8822ce? Why not remove rtw_pm_ops entirely if it just creates
> problems?
> 

I think we can't remove rtw_pm_ops, because wowlan will not work.
We need to find out why the target platform can't properly resume with
this declaration.

--
Ping-Ke

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