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 driver is having difficulty locating the base address from BAR address when
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@codeaurora.org --- drivers/video/fbdev/efifb.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/video/fbdev/efifb.c b/drivers/video/fbdev/efifb.c index 46a4484..ea68d5c 100644 --- a/drivers/video/fbdev/efifb.c +++ b/drivers/video/fbdev/efifb.c @@ -428,6 +428,8 @@ static void efifb_fixup_resources(struct pci_dev *dev) { u64 base = screen_info.lfb_base; u64 size = screen_info.lfb_size; + struct pci_bus_region region; + struct resource res; int i;
if (efifb_pci_dev || screen_info.orig_video_isVGA != VIDEO_TYPE_EFI) @@ -439,6 +441,14 @@ static void efifb_fixup_resources(struct pci_dev *dev) if (!base) return;
+ region.start = base; + region.end = base + size - 1; + res.start = 0; + res.flags = IORESOURCE_MEM; + pcibios_bus_to_resource(dev->bus, &res, ®ion); + if (res.start) + base = res.start; + for (i = 0; i <= PCI_STD_RESOURCE_END; i++) { struct resource *res = &dev->resource[i];