linux-kernel - Re: [PATCH] PCI: dwc: layerscape: convert to builtin_platform

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Message-ID: <2495e985839f3b05ef5e00b58a05ecb7@walle.cc>
Date:   Wed, 20 Jan 2021 15:34:54 +0100
From:   Michael Walle <michael@...le.cc>
To:     Rob Herring <robh@...nel.org>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        PCI <linux-pci@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel@...r.kernel.org,
        Minghuan Lian <minghuan.Lian@....com>,
        Mingkai Hu <mingkai.hu@....com>, Roy Zang <roy.zang@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Saravana Kannan <saravanak@...gle.com>
Subject: Re: [PATCH] PCI: dwc: layerscape: convert to
 builtin_platform_driver()

Am 2021-01-20 15:23, schrieb Rob Herring:
> On Wed, Jan 20, 2021 at 4:53 AM Michael Walle <michael@...le.cc> wrote:
>> 
>> fw_devlink will defer the probe until all suppliers are ready. We 
>> can't
>> use builtin_platform_driver_probe() because it doesn't retry after 
>> probe
>> deferral. Convert it to builtin_platform_driver().
> 
> If builtin_platform_driver_probe() doesn't work with fw_devlink, then
> shouldn't it be fixed or removed? Then we're not fixing drivers later
> when folks start caring about deferred probe and devlink.
> 
> I'd really prefer if we convert this to a module instead. (And all the
> other PCI host drivers.)

I briefly looked into adding a remove() op. But I don't know what will
have to be undo of the ls_pcie_host_init(). That would be up to the
maintainers of this driver.

_But_ I'd really like to see PCI working on my board again ;) At
least until the end of this development cycle.

-michael

>> Fixes: e590474768f1 ("driver core: Set fw_devlink=on by default")
> 
> This happened!?
> 
>> Signed-off-by: Michael Walle <michael@...le.cc>
>> ---
>>  drivers/pci/controller/dwc/pci-layerscape.c | 5 +++--
>>  1 file changed, 3 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/pci/controller/dwc/pci-layerscape.c 
>> b/drivers/pci/controller/dwc/pci-layerscape.c
>> index 44ad34cdc3bc..5b9c625df7b8 100644
>> --- a/drivers/pci/controller/dwc/pci-layerscape.c
>> +++ b/drivers/pci/controller/dwc/pci-layerscape.c
>> @@ -232,7 +232,7 @@ static const struct of_device_id 
>> ls_pcie_of_match[] = {
>>         { },
>>  };
>> 
>> -static int __init ls_pcie_probe(struct platform_device *pdev)
>> +static int ls_pcie_probe(struct platform_device *pdev)
>>  {
>>         struct device *dev = &pdev->dev;
>>         struct dw_pcie *pci;
>> @@ -271,10 +271,11 @@ static int __init ls_pcie_probe(struct 
>> platform_device *pdev)
>>  }
>> 
>>  static struct platform_driver ls_pcie_driver = {
>> +       .probe = ls_pcie_probe,
>>         .driver = {
>>                 .name = "layerscape-pcie",
>>                 .of_match_table = ls_pcie_of_match,
>>                 .suppress_bind_attrs = true,
>>         },
>>  };
>> -builtin_platform_driver_probe(ls_pcie_driver, ls_pcie_probe);
>> +builtin_platform_driver(ls_pcie_driver);
>> --
>> 2.20.1
>>