linux-kernel - Re: [PATCH V2 11/23] arm64, pci: Remove useless boot time IRQ assignment when booting with DT.

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Date:	Tue, 12 Jan 2016 09:56:03 -0800
From:	David Daney <ddaney@...iumnetworks.com>
To:	Tomasz Nowicki <tn@...ihalf.com>
CC:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>, <matt@...arand.com>,
	<bhelgaas@...gle.com>, <arnd@...db.de>, <will.deacon@....com>,
	<catalin.marinas@....com>, <rjw@...ysocki.net>,
	<hanjun.guo@...aro.org>, <okaya@...eaurora.org>,
	<jiang.liu@...ux.intel.com>, <Stefano.Stabellini@...citrix.com>,
	<robert.richter@...iumnetworks.com>, <mw@...ihalf.com>,
	<Liviu.Dudau@....com>, <tglx@...utronix.de>,
	<wangyijing@...wei.com>, <Suravee.Suthikulpanit@....com>,
	<msalter@...hat.com>, <linux-pci@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linaro-acpi@...ts.linaro.org>, <jchandra@...adcom.com>,
	<jcm@...hat.com>
Subject: Re: [PATCH V2 11/23] arm64, pci: Remove useless boot time IRQ assignment
 when booting with DT.

On 01/12/2016 08:13 AM, Tomasz Nowicki wrote:
> On 12.01.2016 14:50, Lorenzo Pieralisi wrote:
>> On Wed, Dec 16, 2015 at 04:16:21PM +0100, Tomasz Nowicki wrote:
>>> In order to probe PCIe host controller when booting with DT,
>>> ARM64 is using drivers which defer IRQ assignment to device
>>> enable time. It means that boot time DT specific irq map initialization
>>> is always overridden, so lets remove that code.
>>>
>>> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
>>> ---
>>>   arch/arm64/kernel/pci.c | 10 ----------
>>>   1 file changed, 10 deletions(-)
>>>
>>> diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
>>> index 023b983..f7948f5 100644
>>> --- a/arch/arm64/kernel/pci.c
>>> +++ b/arch/arm64/kernel/pci.c
>>> @@ -51,16 +51,6 @@ int pcibios_enable_device(struct pci_dev *dev, int
>>> mask)
>>>       return pci_enable_resources(dev, mask);
>>>   }
>>>
>>> -/*
>>> - * Try to assign the IRQ number from DT when adding a new device
>>> - */
>>> -int pcibios_add_device(struct pci_dev *dev)
>>> -{
>>> -    dev->irq = of_irq_parse_and_map_pci(dev, 0, 0);
>>> -
>>> -    return 0;
>>> -}
>>> -

How was this tested?  Or in other words, what PCI devices that use 
legacy INT{A,B,C,D} interrupts were used in testing this patch?

David Daney


>>
>> Actually, this patch should be part of Matthew's series:
>>
>
> Agree.
>
> Matthew can you please add this patch to your series?
>
> Thanks,
> Tomasz