RE: [RESEND v2 3/5] PCI: imx6: Fix the regulator dump when link never came up

From: Richard Zhu <hongxing.zhu@nxp.com>
To: Fabio Estevam <festevam@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	dl-linux-imx <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>
Subject: RE: [RESEND v2 3/5] PCI: imx6: Fix the regulator dump when link never came up
Date: Tue, 19 Oct 2021 07:44:12 +0000	[thread overview]
Message-ID: <AS8PR04MB8676FD8266E1E9883251024E8CBD9@AS8PR04MB8676.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <CAOMZO5DD9mouiBvYE0JwHEAJKENC3Af=j3tQbCsUfWCi8Ji8ug@mail.gmail.com>


> -----Original Message-----
> From: Fabio Estevam <festevam@gmail.com>
> Sent: Saturday, October 16, 2021 2:35 AM
> 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; dl-linux-imx <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>
> Subject: Re: [RESEND v2 3/5] PCI: imx6: Fix the regulator dump when link
> never came up
> 
> 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/
[Richard Zhu] Okay, no problem. Thanks.
BR
Richard