Re: [PATCH V2 2/2] efi/fb: Convert PCI bus address to resource if translated by the bridge
From: Ard Biesheuvel
Date: Wed Jun 13 2018 - 11:06:16 EST
On 13 June 2018 at 16:22, Sinan Kaya <okaya@xxxxxxxxxxxxxx> wrote:
> Hi Ard,
> On 5/18/2018 10:17 AM, Sinan Kaya wrote:
>> A host bridge is allowed to remap BAR addresses using _TRA attribute in
>> _CRS windows.
>> pci_bus 0000:00: root bus resource [mem 0x80100100000-0x8011fffffff window] (bus address [0x00100000-0x1fffffff])
>> pci 0000:02:00.0: reg 0x10: [mem 0x8011e000000-0x8011effffff]
>> When a VGA device is behind such a host bridge and the resource is
>> translated efifb driver is trying to do ioremap against bus address
>> rather than the resource address and is failing to probe.
>> efifb: probing for efifb
>> efifb: cannot reserve video memory at 0x1e000000
>> efifb: framebuffer at 0x1e000000, using 1920k, total 1875k
>> efifb: mode is 800x600x32, linelength=3200, pages=1
>> efifb: scrolling: redraw
>> efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
>> Use the host bridge offset information to convert bus address to
>> resource address in the fixup.
>> Signed-off-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
> I didn't see any messages about these getting picked up for 4.18.
> Are they queued on your own branch?
No, you never cc'ed me on them until now.