linux-kernel - Re: [PATCH v1] phy: tegra: xusb: Fix usb

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Date:   Thu, 26 Nov 2020 16:31:11 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     JC Kuo <jckuo@...dia.com>
Cc:     kishon@...com, vkoul@...nel.org, gregkh@...uxfoundation.org,
        jonathanh@...dia.com, linux-kernel@...r.kernel.org,
        linux-tegra@...r.kernel.org, nkristam@...dia.com
Subject: Re: [PATCH v1] phy: tegra: xusb: Fix usb_phy device driver field

On Tue, Nov 17, 2020 at 04:38:03PM +0800, JC Kuo wrote:
> In commit "phy: tegra: xusb: Add usb-phy support", an OTG capable PHY
> device, such as phy-usb2.0 device of Jetson-TX1 platform, will be
> bound to the tegra-xusb-padctl driver by the following line in
> tegra_xusb_setup_usb_role_switch().
> 
> 	port->usb_phy.dev->driver = port->padctl->dev->driver;
> 
> With this, dev_pm_ops set of tegra-xusb-padctl driver will be invoked
> for the OTG capable PHY incorrectly as below logs show.
> 
> This commit fixes the issue by assigning an empty driver to it.
> 
> [  153.451108] tegra-xusb-padctl phy-usb2.0: > tegra_xusb_padctl_suspend_noirq(dev=ffff000080917000)
> [  153.460353] tegra-xusb-padctl phy-usb2.0:   driver: ffff8000114453e0 (tegra_xusb_padctl_driver)
> [  153.469245] tegra-xusb-padctl phy-usb2.0:   padctl: ffff0000829f6480
> [  153.475772] tegra-xusb-padctl phy-usb2.0:     soc: ef7bdd7fffffffff (0xef7bdd7fffffffff)
> [  153.484061] Unable to handle kernel paging request at virtual address 007bdd800000004f
> [  153.492132] Mem abort info:
> [  153.495083]   ESR = 0x96000004
> [  153.498308]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  153.503771]   SET = 0, FnV = 0
> [  153.506979]   EA = 0, S1PTW = 0
> [  153.510260] Data abort info:
> [  153.513200]   ISV = 0, ISS = 0x00000004
> [  153.517181]   CM = 0, WnR = 0
> [  153.520302] [007bdd800000004f] address between user and kernel address ranges
> [  153.527600] Internal error: Oops: 96000004 [#1] PREEMPT SMP
> [  153.533231] Modules linked in: nouveau panel_simple tegra_video(C) tegra_drm drm_ttm_helper videobuf2_dma_contig ttm videobuf2_memops cec videobuf2_v4l2 videobuf2_common drm_kms_helper v4l2_fwnode videodev drm mc snd_hda_codec_hdmi cdc_ether usbnet snd_hda_tegra r8152 crct10dif_ce snd_hda_codec snd_hda_core tegra_xudc host1x lp855x_bl at24 ip_tables x_tables ipv6
> [  153.566417] CPU: 0 PID: 300 Comm: systemd-sleep Tainted: G         C        5.10.0-rc3-next-20201113-00019-g5c064d5372b0-dirty #624
> [  153.578283] Hardware name: NVIDIA Jetson TX1 Developer Kit (DT)
> [  153.584281] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)
> [  153.590381] pc : tegra_xusb_padctl_suspend_noirq+0x88/0x100
> [  153.596016] lr : tegra_xusb_padctl_suspend_noirq+0x80/0x100
> [  153.601632] sp : ffff8000120dbb60
> [  153.604999] x29: ffff8000120dbb60 x28: ffff000080a1df00
> [  153.610430] x27: 0000000000000002 x26: ffff8000106f8540
> [  153.615858] x25: ffff8000113ac4a4 x24: ffff80001148c198
> [  153.621277] x23: ffff800010c4538c x22: 0000000000000002
> [  153.626692] x21: ffff800010ccde80 x20: ffff0000829f6480
> [  153.632107] x19: ffff000080917000 x18: 0000000000000030
> [  153.637521] x17: 0000000000000000 x16: 0000000000000000
> [  153.642933] x15: ffff000080a1e380 x14: 74636461702d6273
> [  153.648346] x13: ffff8000113ad058 x12: 0000000000000f39
> [  153.653759] x11: 0000000000000513 x10: ffff800011405058
> [  153.659176] x9 : 00000000fffff000 x8 : ffff8000113ad058
> [  153.664590] x7 : ffff800011405058 x6 : 0000000000000000
> [  153.670002] x5 : 0000000000000000 x4 : ffff0000fe908bc0
> [  153.675414] x3 : ffff0000fe910228 x2 : 162ef67e0581e700
> [  153.680826] x1 : 162ef67e0581e700 x0 : ef7bdd7fffffffff
> [  153.686241] Call trace:
> [  153.688769]  tegra_xusb_padctl_suspend_noirq+0x88/0x100
> [  153.694077]  __device_suspend_noirq+0x68/0x1cc
> [  153.698594]  dpm_noirq_suspend_devices+0x10c/0x1d0
> [  153.703456]  dpm_suspend_noirq+0x28/0xa0
> [  153.707461]  suspend_devices_and_enter+0x234/0x4bc
> [  153.712314]  pm_suspend+0x1e4/0x270
> [  153.715868]  state_store+0x8c/0x110
> [  153.719440]  kobj_attr_store+0x1c/0x30
> [  153.723259]  sysfs_kf_write+0x4c/0x7c
> [  153.726981]  kernfs_fop_write+0x124/0x240
> [  153.731065]  vfs_write+0xe4/0x204
> [  153.734449]  ksys_write+0x6c/0x100
> [  153.737925]  __arm64_sys_write+0x20/0x30
> [  153.741931]  el0_svc_common.constprop.0+0x78/0x1a0
> [  153.746789]  do_el0_svc+0x24/0x90
> [  153.750181]  el0_sync_handler+0x254/0x260
> [  153.754251]  el0_sync+0x174/0x180
> [  153.757663] Code: aa0303e2 94000f64 f9405680 b40000e0 (f9402803)
> [  153.763826] ---[ end trace 81543a3394cb409d ]---
> 
> Fixes: e8f7d2f409a1 ("phy: tegra: xusb: Add usb-phy support")
> 
> Signed-off-by: JC Kuo <jckuo@...dia.com>
> ---
>  drivers/phy/tegra/xusb.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Acked-by: Thierry Reding <treding@...dia.com>

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