[PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if translated by the bridge

[Ard Biesheuvel]

On 25 June 2018 at 19:28, Sinan Kaya <okaya at codeaurora.org> wrote:
> On 6/25/2018 11:52 AM, okaya at codeaurora.org wrote:
>>> Note that this is not the only MMIO translation related change made by
>>> Heyi Guo to the generic PCI host bridge and bus drivers, but given
>>> that those did not support MMIO translation at all, I take it your
>>> affected platforms will already have their own changes to accommodate
>>> this.
>>
>> Platform has been doing mmio translation for quite a while. Because all accesses go through pci io protocol, the rest of the UEFI never needed to be aware of bar address or do direct access.
>>
>> This is the first time I hear of direct access. Maybe, GOP is a special case.
>>
>> I started copying your response to the bios vendor.
>>
>> They are probably missing that patch. I will pass it along.
>
> I was informed that they fixed the issue in BIOS by presenting CPU physical
> address instead of PCI bus address in FrameBufferBase of the AST GOP UEFI driver.
>
> We can drop this patch now.
>

Excellent! Thanks for following up with the vendor ...