linux-kernel - Re: bug? dwc2: insufficient fifo memory

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Date:   Sat, 25 Feb 2017 00:24:23 +0000
From:   John Youn <John.Youn@...opsys.com>
To:     John Stultz <john.stultz@...aro.org>,
        John Youn <John.Youn@...opsys.com>
CC:     lkml <linux-kernel@...r.kernel.org>
Subject: Re: bug? dwc2: insufficient fifo memory

On 2/24/2017 2:46 PM, John Stultz wrote:
> Hey John,
>   So after the USB tree landed in 4.11-rc, I've been seeing the
> following warning at bootup.
>
> It seems the fifo_mem/total_fifo_size value on hikey is 1920, but I'm
> seeing the addresses zip upward quickly as the txfsz values are all
> 2048.  Not exactly sure whats wrong here.  Things still seem to work
> properly.

Thanks John.

I'm not sure what could be the problem at the moment but sounds like
something we broke with the default fifo initialization. We'll take a
look at it.

Regards,
John

>
>
> [    8.944987] dwc2 f72c0000.usb: bound driver configfs-gadget
> [    8.956651] insufficient fifo memory
> [    8.956703] ------------[ cut here ]------------
> [    8.964906] WARNING: CPU: 7 PID: 1 at drivers/usb/dwc2/gadget.c:330
> dwc2_hsotg_init_fifo+0x1a8/0x1c8
> [    8.974041]
> [    8.975536] CPU: 7 PID: 1 Comm: init Not tainted
> 4.10.0-09619-gcf8ef33-dirty #2280
> [    8.983115] Hardware name: HiKey Development Board (DT)
> [    8.988344] task: ffffffc005f38000 task.stack: ffffffc005f34000
> [    8.994283] PC is at dwc2_hsotg_init_fifo+0x1a8/0x1c8
> [    8.999341] LR is at dwc2_hsotg_init_fifo+0x1a8/0x1c8
> [    9.004408] pc : [<ffffff8008699640>] lr : [<ffffff8008699640>]
> pstate: 600001c5
> [    9.011819] sp : ffffffc005f37be0
> [    9.015138] x29: ffffffc005f37be0 x28: ffffffc005f38000
> [    9.020471] x27: ffffff8008a52000 x26: 0000000000000001
> [    9.025797] x25: ffffff8008c4d3f0 x24: ffffff8008dbdd3e
> [    9.031118] x23: 0000000008000580 x22: 0000000000000580
> [    9.036454] x21: ffffffc074ba7098 x20: ffffffc074ba7018
> [    9.041781] x19: 000000000000011c x18: 0000000000000010
> [    9.047116] x17: 0000000000000000 x16: ffffff80081d71c8
> [    9.052443] x15: ffffff8088de639f x14: 0000000000000006
> [    9.057763] x13: ffffff8008de63ad x12: ffffff8008d68820
> [    9.063084] x11: 0000000000000000 x10: ffffffc005f37be0
> [    9.068404] x9 : ffffffc005f37be0 x8 : 66696620746e6569
> [    9.073726] x7 : 6369666675736e69 x6 : 000000000000034e
> [    9.079047] x5 : 0000000000000015 x4 : 0000000000000000
> [    9.084382] x3 : 0000000000000002 x2 : 0000000000000002
> [    9.089722] x1 : 0000000000000001 x0 : 0000000000000018
> [    9.095051]
> [    9.096545] ---[ end trace 7e67e3086c7527eb ]---
> [    9.101173] Call trace:
> [    9.103641] Exception stack(0xffffffc005f37a10 to 0xffffffc005f37b40)
> [    9.110112] 7a00:
> 000000000000011c 0000008000000000
> [    9.117954] 7a20: ffffffc005f37be0 ffffff8008699640
> ffffff8008c4d3f0 0000000000000001
> [    9.125809] 7a40: ffffff8008a52000 ffffffc005f38000
> ffffffc005f37a90 0000000000000000
> [    9.133667] 7a60: ffffffc005f37be0 ffffffc005f37be0
> ffffffc005f37ba0 00000000ffffffc8
> [    9.141530] 7a80: ffffffc005f37ab0 ffffff8008105114
> ffffffc005f37be0 ffffffc005f37be0
> [    9.149390] 7aa0: ffffffc005f37ba0 00000000ffffffc8
> 0000000000000018 0000000000000001
> [    9.157252] 7ac0: 0000000000000002 0000000000000002
> 0000000000000000 0000000000000015
> [    9.165114] 7ae0: 000000000000034e 6369666675736e69
> 66696620746e6569 ffffffc005f37be0
> [    9.172957] 7b00: ffffffc005f37be0 0000000000000000
> ffffff8008d68820 ffffff8008de63ad
> [    9.180811] 7b20: 0000000000000006 ffffff8088de639f
> ffffff80081d71c8 0000000000000000
> [    9.188673] [<ffffff8008699640>] dwc2_hsotg_init_fifo+0x1a8/0x1c8
> [    9.194803] [<ffffff800869cb74>] dwc2_hsotg_core_init_disconnected+0x7c/0x3d0
> [    9.201970] [<ffffff800869d928>] dwc2_hsotg_pullup+0x90/0x100
> [    9.207751] [<ffffff80086c1aa8>] usb_udc_connect_control.isra.0+0x78/0x90
> [    9.214572] [<ffffff80086c1b84>] udc_bind_to_driver+0xc4/0xe8
> [    9.220349] [<ffffff80086c2a90>] usb_gadget_probe_driver+0xa0/0x150
> [    9.226629] [<ffffff80086c0f84>] gadget_dev_desc_UDC_store+0xdc/0xf8
> [    9.233015] [<ffffff8008255528>] configfs_write_file+0xc0/0x198
> [    9.238969] [<ffffff80081d6d94>] __vfs_write+0x1c/0x100
> [    9.244206] [<ffffff80081d7018>] vfs_write+0xa0/0x1b0
> [    9.249269] [<ffffff80081d720c>] SyS_write+0x44/0xa0
> [    9.254245] [<ffffff8008082f30>] el0_svc_naked+0x24/0x28
>