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Date:   Thu, 13 Jun 2019 11:35:51 +0200
From:   Simon Horman <horms@verge.net.au>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Cc:     kishon@ti.com, geert+renesas@glider.be,
        linux-kernel@vger.kernel.org, linux-renesas-soc@vger.kernel.org
Subject: Re: [PATCH v3] phy: renesas: rcar-gen3-usb2: fix imbalance powered
 flag
Message-ID: <20190613093550.ytchwgeqejgrqkui@verge.net.au>
References: <1560147835-7629-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>
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On Mon, Jun 10, 2019 at 03:23:55PM +0900, Yoshihiro Shimoda wrote:
> The powered flag should be set for any other phys anyway. Also
> the flag should be locked by the channel. Otherwise, after we have
> revised the device tree for the usb phy, the following warning
> happened during a second system suspend. And if the driver doesn't
> lock the flag, an imbalance is possible when enabling the regulator
> during system resume. So, this patch fixes the issues.
> 
> < The warning >
> [   56.026531] unbalanced disables for USB20_VBUS0
> [   56.031108] WARNING: CPU: 3 PID: 513 at drivers/regulator/core.c:2593 _regula
> tor_disable+0xe0/0x1c0
> [   56.040146] Modules linked in: rcar_du_drm rcar_lvds drm_kms_helper drm drm_p
> anel_orientation_quirks vsp1 videobuf2_vmalloc videobuf2_dma_contig videobuf2_me
> mops videobuf2_v4l2 videobuf2_common videodev snd_soc_rcar renesas_usbhs snd_soc
> _audio_graph_card media snd_soc_simple_card_utils crct10dif_ce renesas_usb3 snd_
> soc_ak4613 rcar_fcp pwm_rcar usb_dmac phy_rcar_gen3_usb3 pwm_bl ipv6
> [   56.074047] CPU: 3 PID: 513 Comm: kworker/u16:19 Not tainted 5.2.0-rc3-00001-
> g5f20a19 #6
> [   56.082129] Hardware name: Renesas Salvator-X board based on r8a7795 ES2.0+ (
> DT)
> [   56.089524] Workqueue: events_unbound async_run_entry_fn
> [   56.094832] pstate: 40000005 (nZcv daif -PAN -UAO)
> [   56.099617] pc : _regulator_disable+0xe0/0x1c0
> [   56.104054] lr : _regulator_disable+0xe0/0x1c0
> [   56.108489] sp : ffff0000121c3ae0
> [   56.111796] x29: ffff0000121c3ae0 x28: 0000000000000000
> [   56.117102] x27: 0000000000000000 x26: ffff000010fe0e60
> [   56.122407] x25: 0000000000000002 x24: 0000000000000001
> [   56.127712] x23: 0000000000000002 x22: ffff8006f99d4000
> [   56.133017] x21: ffff8006f99cc000 x20: ffff8006f9846800
> [   56.138322] x19: ffff8006f9846800 x18: ffffffffffffffff
> [   56.143626] x17: 0000000000000000 x16: 0000000000000000
> [   56.148931] x15: ffff0000112f96c8 x14: ffff0000921c37f7
> [   56.154235] x13: ffff0000121c3805 x12: ffff000011312000
> [   56.159540] x11: 0000000005f5e0ff x10: ffff0000112f9f20
> [   56.164844] x9 : ffff0000112d3018 x8 : 00000000000001ad
> [   56.170149] x7 : 00000000ffffffcc x6 : ffff8006ff768180
> [   56.175453] x5 : ffff8006ff768180 x4 : 0000000000000000
> [   56.180758] x3 : ffff8006ff76ef10 x2 : ffff8006ff768180
> [   56.186062] x1 : 3d2eccbaead8fb00 x0 : 0000000000000000
> [   56.191367] Call trace:
> [   56.193808]  _regulator_disable+0xe0/0x1c0
> [   56.197899]  regulator_disable+0x40/0x78
> [   56.201820]  rcar_gen3_phy_usb2_power_off+0x3c/0x50
> [   56.206692]  phy_power_off+0x48/0xd8
> [   56.210263]  usb_phy_roothub_power_off+0x30/0x50
> [   56.214873]  usb_phy_roothub_suspend+0x1c/0x50
> [   56.219311]  hcd_bus_suspend+0x13c/0x168
> [   56.223226]  generic_suspend+0x4c/0x58
> [   56.226969]  usb_suspend_both+0x1ac/0x238
> [   56.230972]  usb_suspend+0xcc/0x170
> [   56.234455]  usb_dev_suspend+0x10/0x18
> [   56.238199]  dpm_run_callback.isra.6+0x20/0x68
> [   56.242635]  __device_suspend+0x110/0x308
> [   56.246637]  async_suspend+0x24/0xa8
> [   56.250205]  async_run_entry_fn+0x40/0xf8
> [   56.254210]  process_one_work+0x1e0/0x320
> [   56.258211]  worker_thread+0x40/0x450
> [   56.261867]  kthread+0x124/0x128
> [   56.265094]  ret_from_fork+0x10/0x18
> [   56.268661] ---[ end trace 86d7ec5de5c517af ]---
> [   56.273290] phy phy-ee080200.usb-phy.10: phy poweroff failed --> -5
> 
> Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Fixes: 549b6b55b005 ("phy: renesas: rcar-gen3-usb2: enable/disable independent irqs")
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>

Reviewed-by: Simon Horman <horms+renesas@verge.net.au>