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Date: Tue, 08 Sep 2020 14:50:41 +0300
From: Felipe Balbi <balbi@...nel.org>
To: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linuxarm@...wei.com, mauro.chehab@...wei.com,
John Stultz <john.stultz@...aro.org>,
Manivannan Sadhasivam <mani@...nel.org>,
Philipp Zabel <p.zabel@...gutronix.de>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dwc3-of-simple: add support for Hikey 970
Hi,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org> writes:
>> Mauro Carvalho Chehab <mchehab+huawei@...nel.org> writes:
>> > This binding driver is needed for Hikey 970 to work,
>> > as otherwise a Serror is produced:
>>
>> you mentioned Serror doesn't happen anymore...
>>
>> > [ 1.837458] SError Interrupt on CPU0, code 0xbf000002 -- SError
>> > [ 1.837462] CPU: 0 PID: 74 Comm: kworker/0:1 Not tainted 5.8.0+ #205
>> > [ 1.837463] Hardware name: HiKey970 (DT)
>> > [ 1.837465] Workqueue: events deferred_probe_work_func
>> > [ 1.837467] pstate: 20000005 (nzCv daif -PAN -UAO BTYPE=--)
>> > [ 1.837468] pc : _raw_spin_unlock_irqrestore+0x18/0x50
>> > [ 1.837469] lr : regmap_unlock_spinlock+0x14/0x20
>> > [ 1.837470] sp : ffff8000124dba60
>> > [ 1.837471] x29: ffff8000124dba60 x28: 0000000000000000
>> > [ 1.837474] x27: ffff0001b7e854c8 x26: ffff80001204ea18
>> > [ 1.837476] x25: 0000000000000005 x24: ffff800011f918f8
>> > [ 1.837479] x23: ffff800011fbb588 x22: ffff0001b7e40e00
>> > [ 1.837481] x21: 0000000000000100 x20: 0000000000000000
>> > [ 1.837483] x19: ffff0001b767ec00 x18: 00000000ff10c000
>> > [ 1.837485] x17: 0000000000000002 x16: 0000b0740fdb9950
>> > [ 1.837488] x15: ffff8000116c1198 x14: ffffffffffffffff
>> > [ 1.837490] x13: 0000000000000030 x12: 0101010101010101
>> > [ 1.837493] x11: 0000000000000020 x10: ffff0001bf17d130
>> > [ 1.837495] x9 : 0000000000000000 x8 : ffff0001b6938080
>> > [ 1.837497] x7 : 0000000000000000 x6 : 000000000000003f
>> > [ 1.837500] x5 : 0000000000000000 x4 : 0000000000000000
>> > [ 1.837502] x3 : ffff80001096a880 x2 : 0000000000000000
>> > [ 1.837505] x1 : ffff0001b7e40e00 x0 : 0000000100000001
>> > [ 1.837507] Kernel panic - not syncing: Asynchronous SError Interrupt
>> > [ 1.837509] CPU: 0 PID: 74 Comm: kworker/0:1 Not tainted 5.8.0+ #205
>> > [ 1.837510] Hardware name: HiKey970 (DT)
>> > [ 1.837511] Workqueue: events deferred_probe_work_func
>> > [ 1.837513] Call trace:
>> > [ 1.837514] dump_backtrace+0x0/0x1e0
>> > [ 1.837515] show_stack+0x18/0x24
>> > [ 1.837516] dump_stack+0xc0/0x11c
>> > [ 1.837517] panic+0x15c/0x324
>> > [ 1.837518] nmi_panic+0x8c/0x90
>> > [ 1.837519] arm64_serror_panic+0x78/0x84
>> > [ 1.837520] do_serror+0x158/0x15c
>> > [ 1.837521] el1_error+0x84/0x100
>> > [ 1.837522] _raw_spin_unlock_irqrestore+0x18/0x50
>> > [ 1.837523] regmap_write+0x58/0x80
>> > [ 1.837524] hi3660_reset_deassert+0x28/0x34
>> > [ 1.837526] reset_control_deassert+0x50/0x260
>> > [ 1.837527] reset_control_deassert+0xf4/0x260
>> > [ 1.837528] dwc3_probe+0x5dc/0xe6c
>> > [ 1.837529] platform_drv_probe+0x54/0xb0
>> > [ 1.837530] really_probe+0xe0/0x490
>> > [ 1.837531] driver_probe_device+0xf4/0x160
>> > [ 1.837532] __device_attach_driver+0x8c/0x114
>> > [ 1.837533] bus_for_each_drv+0x78/0xcc
>> > [ 1.837534] __device_attach+0x108/0x1a0
>> > [ 1.837535] device_initial_probe+0x14/0x20
>> > [ 1.837537] bus_probe_device+0x98/0xa0
>> > [ 1.837538] deferred_probe_work_func+0x88/0xe0
>> > [ 1.837539] process_one_work+0x1cc/0x350
>> > [ 1.837540] worker_thread+0x2c0/0x470
>> > [ 1.837541] kthread+0x154/0x160
>> > [ 1.837542] ret_from_fork+0x10/0x30
>> > [ 1.837569] SMP: stopping secondary CPUs
>> > [ 1.837570] Kernel Offset: 0x1d0000 from 0xffff800010000000
>> > [ 1.837571] PHYS_OFFSET: 0x0
>> > [ 1.837572] CPU features: 0x240002,20882004
>> > [ 1.837573] Memory Limit: none
>>
>> is this splat still valid?
>
> What I tried to say, is that, if the dwc3 is described this way at the
> DT bindings:
>
>
> / {
> dwc3: dwc3@...00000 {
> compatible = "snps,dwc3";
> reg = <0x0 0xff100000 0x0 0x100000>;
> clocks = <&crg_ctrl HI3670_CLK_GATE_ABB_USB>,
> <&crg_ctrl HI3670_HCLK_GATE_USB3OTG>,
> <&crg_ctrl HI3670_CLK_GATE_USB3OTG_REF>,
> <&crg_ctrl HI3670_ACLK_GATE_USB3DVFS>;
> ...
>
> The panic occurs, with the logs posted at the patch.
>
> The fix is to use dwc3-of-simple to initialize the clocks earlier,
> e. g., using this binding:
>
> / {
> usb3: hisi_dwc3 {
> compatible = "hisilicon,kirin970-dwc3";
> #address-cells = <2>;
> #size-cells = <2>;
> ranges;
>
> clocks = <&crg_ctrl HI3670_CLK_GATE_ABB_USB>,
> <&crg_ctrl HI3670_HCLK_GATE_USB3OTG>,
> <&crg_ctrl HI3670_CLK_GATE_USB3OTG_REF>,
> <&crg_ctrl HI3670_ACLK_GATE_USB3DVFS>;
>
>
> dwc3: dwc3@...00000 {
> compatible = "snps,dwc3";
> teg = <0x0 0xff100000 0x0 0x100000>;
> ...
now it's clear, I'll apply as is :-)
--
balbi
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