Hello Richard, please see this comment from Mark, https://lore.kernel.org/all/YXaGve1ZJq0DGZ9l@xxxxxxxxxxxxx/. Francesco On Fri, Oct 22, 2021 at 03:12:26PM +0800, Richard Zhu 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 ]--- > > Link: https://lore.kernel.org/r/20201105211159.1814485-11-robh@xxxxxxxxxx > Fixes: 886a9c134755 ("PCI: dwc: Move link handling into common code") > Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx> > --- > drivers/pci/controller/dwc/pci-imx6.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 3372775834a2..39a485bfc676 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -1180,8 +1180,12 @@ static int imx6_pcie_probe(struct platform_device *pdev) > return ret; > > ret = dw_pcie_host_init(&pci->pp); > - if (ret < 0) > + if (ret < 0) { > + if (imx6_pcie->vpcie > + && regulator_is_enabled(imx6_pcie->vpcie) > 0) > + regulator_disable(imx6_pcie->vpcie); > return ret; > + } > > if (pci_msi_enabled()) { > u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_MSI); > -- > 2.25.1 > > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
