[PATCH] imx6: fix pcie enumeration

[Koen Vandeputte]

On 2018-01-09 14:48, Niklas Cassel wrote:
> <snip>

>>       /* setup bus numbers */
>>       val = dw_pcie_readl_rc(pp, PCI_PRIMARY_BUS);
>>       val &= 0xff000000;
>> -    val |= 0x00010100;
>> +    val |= 0x00ff0100;
>>       dw_pcie_writel_rc(pp, PCI_PRIMARY_BUS, val);
>>
>>       /* setup command register */
>>
>>
>> Above version logically fixes it for all dwc devices using a bridge after the RC, not only imx6.
>> If this is fine, I would submit the patch above and drop the current one.
> I can confirm that commit a20c7f36bd3d ("PCI: Do not allocate more buses than
> available in parent") broke enumerating PCIe devices behind a PCIe switch
> on ARTPEC-6 (which uses the DWC IP).
> (FTR, arch/arm/boot/dts/artpec6.dtsi specifies bus-range = <0x00 0xff>).
>
> This patch resolves the problem.
> (I verified on linux-next: next-20180109).
>
> However, note that I had to patch the file
> drivers/pci/dwc/pcie-designware-host.c
> rather than
> drivers/pci/host/pcie-designware.c,
> which this patch suggests.
Above internally used example patch is based on kernel 4.9.74, where 
this file hasn't moved/renamed yet to dwc subfolder
I'll post a proper one shortly for the upstream tree.

Thanks for testing,

Koen
> Please feel free to submit a new patch with:
>
> Tested-by: Niklas Cassel <niklas.cassel at axis.com>
>