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Date:   Fri, 23 Jul 2021 09:59:42 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Ferry Toth <fntoth@...il.com>,
        Wesley Cheng <wcheng@...eaurora.org>,
        gregkh@...uxfoundation.org, robh+dt@...nel.org, agross@...nel.org,
        bjorn.andersson@...aro.org, frowand.list@...il.com
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        jackp@...eaurora.org, heikki.krogerus@...ux.intel.com,
        andy.shevchenko@...il.com
Subject: Re: [PATCH v10 0/6] Re-introduce TX FIFO resize for larger EP bursting


Hi,

Ferry Toth <fntoth@...il.com> writes:
>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>> kernel: dwc3 dwc3.0.auto: request 00000000fbc71244 was not queued to ep5in
>>> kernel: dwc3 dwc3.0.auto: request 00000000ad1b8c18 was not queued to ep5in
>>> kernel: dwc3 dwc3.0.auto: Fifosize(2154) > RAM size(2022) ep5in
>>> depth:115540359
>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>> kernel: configfs-gadget gadget: u_audio_start_playback:451 Error!
>>> kernel: dwc3 dwc3.0.auto: request 000000003c32dcc5 was not queued to ep5in
>>> kernel: dwc3 dwc3.0.auto: request 00000000b2512aa9 was not queued to ep5in
>>>
>>> Removing uac2 from the config makes the call trace go away, but the R/W
>>> speed does not change.
>
> I am testing with 5.14.0-rc2 and now related error appears (not in rc1). 
> Disabling uac2 solves it still. Any idea what it could be?
>
> BUG: unable to handle page fault for address: 0000000500000000
> #PF: supervisor instruction fetch in kernel mode
> #PF: error_code(0x0010) - not-present page
> PGD 0 P4D 0
> Oops: 0010 [#1] SMP PTI
> CPU: 0 PID: 494 Comm: irq/14-dwc3 Not tainted 
> 5.14.0-rc2-edison-acpi-standard #1

(cool that you're running on ACPI heh)

> Hardware name: Intel Corporation Merrifield/BODEGA BAY, BIOS 542 
> 2015.01.21:18.19.48
> RIP: 0010:0x500000000
> Code: Unable to access opcode bytes at RIP 0x4ffffffd6.
> RSP: 0018:ffffa4d00045fc28 EFLAGS: 00010046
> RAX: 0000000500000000 RBX: ffff8cd546aed200 RCX: 0000000000000000
> RDX: 0000000000000000 RSI: ffff8cd547bfcae0 RDI: ffff8cd546aed200
> RBP: ffff8cd547bfcae0 R08: 0000000000000000 R09: 0000000000000001
> R10: ffff8cd541fd28c0 R11: 0000000000000000 R12: ffff8cd547342828
> R13: ffff8cd546aed248 R14: 0000000000000000 R15: ffff8cd548b1d000
> FS:  0000000000000000(0000) GS:ffff8cd57e200000(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000500000000 CR3: 000000000311e000 CR4: 00000000001006f0
> Call Trace:
>   ? dwc3_remove_requests.constprop.0+0x14d/0x170
>   ? __dwc3_gadget_ep_disable+0x7a/0x160
>   ? dwc3_gadget_ep_disable+0x3d/0xd0
>   ? usb_ep_disable+0x1c/0x70
>   ? u_audio_stop_capture+0x79/0x120 [u_audio]
>   ? afunc_set_alt+0x73/0x80 [usb_f_uac2]
>   ? composite_setup+0x224/0x1b90 [libcomposite]
>   ? __dwc3_gadget_kick_transfer+0x160/0x400
>   ? dwc3_gadget_ep_queue+0xf3/0x1a0
>   ? configfs_composite_setup+0x6b/0x90 [libcomposite]
>   ? configfs_composite_setup+0x6b/0x90 [libcomposite]
>   ? dwc3_ep0_interrupt+0x459/0xa40
>   ? dwc3_thread_interrupt+0x8ee/0xf40
>   ? __schedule+0x235/0x6c0
>   ? disable_irq_nosync+0x10/0x10
>   ? irq_thread_fn+0x1b/0x60
>   ? irq_thread+0xc0/0x160
>   ? irq_thread_check_affinity+0x70/0x70
>   ? irq_forced_thread_fn+0x70/0x70
>   ? kthread+0x122/0x140
>   ? set_kthread_struct+0x40/0x40
>   ? ret_from_fork+0x22/0x30

Do you mind enabling dwc3 traces and collecting them? Trying to figure
out how we got here.

-- 
balbi

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