Request for Info: Designware PCIe Root Complex support in ARM64

Request for Info: Designware PCIe Root Complex support in ARM64

[Joao Pinto]

Hi Liviu, Catalin and Bjorn,

I am currently working on the PCIe Root Complex based on the Designware Core
(/pci/host/pcie-desigware.c). I have noticed that currently building a solution
based on the previous for an ARM64 CPU is problematic and demands some tweaking
in the ARM64 arch (like adding some functions in the pcibios, etc.).

I would like to know if any specific work is being planned for this matter and
in what I could contribute to make it happen.

Thanks,
Joao Pinto

Re: Request for Info: Designware PCIe Root Complex support in ARM64

[Liviu Dudau]

On Fri, Mar 11, 2016 at 11:33:12AM +0000, Joao Pinto wrote:
> Hi Liviu, Catalin and Bjorn,

Adding Lorenzo as he has been taking over the PCIe side from me for a while now.

Best regards,
Liviu

> 
> I am currently working on the PCIe Root Complex based on the Designware Core
> (/pci/host/pcie-desigware.c). I have noticed that currently building a solution
> based on the previous for an ARM64 CPU is problematic and demands some tweaking
> in the ARM64 arch (like adding some functions in the pcibios, etc.).
> 
> I would like to know if any specific work is being planned for this matter and
> in what I could contribute to make it happen.
> 
> Thanks,
> Joao Pinto
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯

Re: Request for Info: Designware PCIe Root Complex support in ARM64

[Bjorn Helgaas]

[+cc Lorenzo]

On Fri, Mar 11, 2016 at 11:33:12AM +0000, Joao Pinto wrote:
> Hi Liviu, Catalin and Bjorn,
> 
> I am currently working on the PCIe Root Complex based on the Designware Core
> (/pci/host/pcie-desigware.c). I have noticed that currently building a solution
> based on the previous for an ARM64 CPU is problematic and demands some tweaking
> in the ARM64 arch (like adding some functions in the pcibios, etc.).

If I understand you correctly, you're saying that pcie-designware.c
doesn't build on arm64.  It would be helpful to know exactly what
problem you're seeing (what kernel version, what config, what the
error are, etc.)

PCI_LAYERSCAPE, PCI_HISI, and PCIE_QCOM can all be enabled on arm64,
and it looks like they all depend on pcie-designware.c.  I can't build
those drivers personally, but I assume they work.

Bjorn

Re: Request for Info: Designware PCIe Root Complex support in ARM64

[Lorenzo Pieralisi]

On Fri, Mar 11, 2016 at 01:46:00PM -0600, Bjorn Helgaas wrote:
> [+cc Lorenzo]
> 
> On Fri, Mar 11, 2016 at 11:33:12AM +0000, Joao Pinto wrote:
> > Hi Liviu, Catalin and Bjorn,
> > 
> > I am currently working on the PCIe Root Complex based on the Designware Core
> > (/pci/host/pcie-desigware.c). I have noticed that currently building a solution
> > based on the previous for an ARM64 CPU is problematic and demands some tweaking
> > in the ARM64 arch (like adding some functions in the pcibios, etc.).
> 
> If I understand you correctly, you're saying that pcie-designware.c
> doesn't build on arm64.  It would be helpful to know exactly what
> problem you're seeing (what kernel version, what config, what the
> error are, etc.)

Yes, I am not sure I understand what Joao is referring to so I would
be grateful if he can provide us with additional details.

Thanks,
Lorenzo

Re: Request for Info: Designware PCIe Root Complex support in ARM64

[Joao Pinto]

Hi!
Just built the linux-next for ARM64 and built beautifully so there is no issue.
I was having an issue using 3.18, but with this new kernel no issues were found.
Thanks for all your inputs!

Joao


On 3/14/2016 12:15 PM, Lorenzo Pieralisi wrote:
> On Fri, Mar 11, 2016 at 01:46:00PM -0600, Bjorn Helgaas wrote:
>> [+cc Lorenzo]
>>
>> On Fri, Mar 11, 2016 at 11:33:12AM +0000, Joao Pinto wrote:
>>> Hi Liviu, Catalin and Bjorn,
>>>
>>> I am currently working on the PCIe Root Complex based on the Designware Core
>>> (/pci/host/pcie-desigware.c). I have noticed that currently building a solution
>>> based on the previous for an ARM64 CPU is problematic and demands some tweaking
>>> in the ARM64 arch (like adding some functions in the pcibios, etc.).
>>
>> If I understand you correctly, you're saying that pcie-designware.c
>> doesn't build on arm64.  It would be helpful to know exactly what
>> problem you're seeing (what kernel version, what config, what the
>> error are, etc.)
> 
> Yes, I am not sure I understand what Joao is referring to so I would
> be grateful if he can provide us with additional details.
> 
> Thanks,
> Lorenzo
>