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From:   Fabio Estevam <festevam@gmail.com>
Date:   Fri, 15 Oct 2021 15:34:45 -0300
Message-ID: <CAOMZO5DD9mouiBvYE0JwHEAJKENC3Af=j3tQbCsUfWCi8Ji8ug@mail.gmail.com>
Subject: Re: [RESEND v2 3/5] PCI: imx6: Fix the regulator dump when link never
 came up
To:     Richard Zhu <hongxing.zhu@nxp.com>
Cc:     Lucas Stach <l.stach@pengutronix.de>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        linux-pci@vger.kernel.org, NXP Linux Team <linux-imx@nxp.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Sascha Hauer <kernel@pengutronix.de>
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Precedence: bulk

Hi Richard,

On Fri, Oct 15, 2021 at 3:32 AM Richard Zhu <hongxing.zhu@nxp.com> wrote:
>
> When PCIe PHY link never came up and vpcie regulator is present, there
> would be following dump when try to put the regulator.
> Disable this regulator to fix this dump when link never came up.
>
>   imx6q-pcie 33800000.pcie: Phy link never came up
>   imx6q-pcie: probe of 33800000.pcie failed with error -110
>   ------------[ cut here ]------------
>   WARNING: CPU: 3 PID: 119 at drivers/regulator/core.c:2256 _regulator_put.part.0+0x14c/0x158
>   Modules linked in:
>   CPU: 3 PID: 119 Comm: kworker/u8:2 Not tainted 5.13.0-rc7-next-20210625-94710-ge4e92b2588a3 #10
>   Hardware name: FSL i.MX8MM EVK board (DT)
>   Workqueue: events_unbound async_run_entry_fn
>   pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--)
>   pc : _regulator_put.part.0+0x14c/0x158
>   lr : regulator_put+0x34/0x48
>   sp : ffff8000122ebb30
>   x29: ffff8000122ebb30 x28: ffff800011be7000 x27: 0000000000000000
>   x26: 0000000000000000 x25: 0000000000000000 x24: ffff00000025f2bc
>   x23: ffff00000025f2c0 x22: ffff00000025f010 x21: ffff8000122ebc18
>   x20: ffff800011e3fa60 x19: ffff00000375fd80 x18: 0000000000000010
>   x17: 000000040044ffff x16: 00400032b5503510 x15: 0000000000000108
>   x14: ffff0000003cc938 x13: 00000000ffffffea x12: 0000000000000000
>   x11: 0000000000000000 x10: ffff80001076ba88 x9 : ffff80001076a540
>   x8 : ffff00000025f2c0 x7 : ffff0000001f4450 x6 : ffff000000176cd8
>   x5 : ffff000003857880 x4 : 0000000000000000 x3 : ffff800011e3fe30
>   x2 : ffff0000003cc4c0 x1 : 0000000000000000 x0 : 0000000000000001
>   Call trace:
>    _regulator_put.part.0+0x14c/0x158
>    regulator_put+0x34/0x48
>    devm_regulator_release+0x10/0x18
>    release_nodes+0x38/0x60
>    devres_release_all+0x88/0xd0
>    really_probe+0xd0/0x2e8
>    __driver_probe_device+0x74/0xd8
>    driver_probe_device+0x7c/0x108
>    __device_attach_driver+0x8c/0xd0
>    bus_for_each_drv+0x74/0xc0
>    __device_attach_async_helper+0xb4/0xd8
>    async_run_entry_fn+0x30/0x100
>    process_one_work+0x19c/0x320
>    worker_thread+0x48/0x418
>    kthread+0x14c/0x158
>    ret_from_fork+0x10/0x18
>   ---[ end trace 3664ca4a50ce849b ]---
>
> Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>

I am seeing this on imx6 too. When you send a v2, after addressing
Lucas' comments, please add a Fixes tag/