linux-kernel - Re: [PATCH] PCI: dwc: Add map irq callback

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Date:   Wed, 14 Aug 2019 16:31:14 +0800
From:   Dilip Kota <eswara.kota@...ux.intel.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        andriy.shevchenko@...el.com
Subject: Re: [PATCH] PCI: dwc: Add map irq callback

Hi Christoph Hellwig,

On 8/14/2019 3:36 PM, Christoph Hellwig wrote:
> On Wed, Aug 14, 2019 at 02:56:49PM +0800, Dilip Kota wrote:
>> Certain platforms like Intel need to configure
>> registers to enable the interrupts.
>> Map Irq callback helps to perform platform specific
>> configurations while assigning or enabling the interrupts.
> This seems to miss the hunk that actually assigns the map_irq
> callback.
pp->map_irq() must assign the callback along with the platform specific 
configuration.
In Intel PCIe driver pp->map_irq() does the same. (Driver is not yet 
present in mainline, i will submit for review once this change is approved).
>> diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>> index f93252d0da5b..5880d2b72ef8 100644
>> --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>> +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>> @@ -470,7 +470,7 @@ int dw_pcie_host_init(struct pcie_port *pp)
>>   	bridge->sysdata = pp;
>>   	bridge->busnr = pp->root_bus_nr;
>>   	bridge->ops = &dw_pcie_ops;
>> -	bridge->map_irq = of_irq_parse_and_map_pci;
>> +	bridge->map_irq = pp->map_irq ? pp->map_irq : of_irq_parse_and_map_pci;
> Pleae just use a classic if / else to make the code a little easier
> to read.

Noted, will update it.

--Dilip