Radeon drm: Hang with posting GPU when PCI card is primary

[Meelis Roos]

> [   10.169900] [drm] radeon kernel modesetting enabled.
> [   10.170270] radeon 0000:02:00.0: enabling device (0080 -> 0083)
> [   10.170816] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 11
> [   10.171044] radeon 0000:02:00.0: PCI INT A -> Link[LNKA] -> GSI 11 (level, low) -> IRQ 11
> [   10.172664] [drm] initializing kernel modesetting (RV100 0x1002:0x5159).
> [   10.172897] [drm] register mmio base: 0xFEAF0000
> [   10.173098] [drm] register mmio size: 65536
> [   10.273609] [drm] GPU not posted. posting now...

Hmm. Added some printk-s (POSTing combios for example) and now it did 
not hang any more but failed gracefully which is much better.

[    5.769826] [drm] radeon kernel modesetting enabled.
[    5.770181] radeon 0000:02:00.0: enabling device (0080 -> 0083)
[    5.770677] ACPI: PCI Interrupt Link [LNKA] enabled at IRQ 11
[    5.770903] radeon 0000:02:00.0: PCI INT A -> Link[LNKA] -> GSI 11 (level, low) -> IRQ 11
[    5.772142] [drm] initializing kernel modesetting (RV100 0x1002:0x5159).
[    5.772363] [drm] register mmio base: 0xFEAF0000
[    5.772529] [drm] register mmio size: 65536
[    5.914902] [drm] GPU not posted. posting now...
[    5.915086] [drm] POSTing combios
[    5.938458] agpgart-intel 0000:00:00.0: AGP 2.0 bridge
[    5.938697] agpgart: Couldn't find an AGP VGA controller.
[    5.938914] radeon 0000:02:00.0: GTT: 64M 0xF8000000 - 0xFBFFFFFF
[    5.939133] [drm] Generation 1 PCI interface in multifunction mode
[    5.939352] [drm] Limiting VRAM to one aperture
[    5.939569] radeon 0000:02:00.0: limiting VRAM to PCI aperture size
[    5.939792] radeon 0000:02:00.0: VRAM: 128M 0x00000000E8000000 - 0x00000000EFFFFFFF (128M used)
[    5.940212] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
[    5.940425] [drm] Driver supports precise vblank timestamp query.
[    5.940666] [drm] radeon: irq initialized.
[    5.941035] [drm] Detected VRAM RAM=128M, BAR=128M
[    5.941263] [drm] RAM width 64bits SDR
[    5.941607] [TTM] Zone  kernel: Available graphics memory: 257508 kiB.
[    5.941825] [TTM] Initializing pool allocator.
[    5.942111] radeon 0000:02:00.0: df650c00 pin failed
[    5.942351] radeon 0000:02:00.0: Fatal error during GPU init
[    5.942567] [drm] radeon: finishing device.
[    5.942783] [drm] radeon: cp finalized
[    5.943014] [TTM] Trying to take down uninitialized memory manager type 1
[    5.943243] [TTM] Finalizing pool allocator.
[    5.943523] [TTM] Zone  kernel: Used memory at exit: 0 kiB.
[    5.943693] [drm] radeon: ttm finalized
[    5.944380] radeon 0000:02:00.0: PCI INT A disabled
[    5.944564] radeon: probe of 0000:02:00.0 failed with error -22



-- 
Meelis Roos (mroos at ut.ee)      http://www.cs.ut.ee/~mroos/