linux-3.3-rc2 and radeon kms failure on ppc32 with Radeon 9250 pci

[acrux]

On Tue, 07 Feb 2012 19:01:04 +0100
Michel Dänzer <michel at daenzer.net> wrote:

> On Son, 2012-02-05 at 00:41 +0100, acrux wrote:
> > unable to have a working radeon kms framebuffer with linux-3.3-rc2
> > on ppc video card: Radeon 9250 PCI
> 
> Is this a regression? If yes, can you bisect?
> 

not a regression, i didn't find a working kernel release


> 
> > Machine check in kernel mode.
> > Data Write PLB Error
> > Machine Check exception is imprecise
> > Oops: Machine check, sig: 7 [#1]
> > Canyonlands
> > Modules linked in:
> > NIP: c000a580 LR: c0399084 CTR: 000bfffb
> > REGS: efff7f10 TRAP: 0214   Not tainted  (3.3.0-rc2)
> > MSR: 00029000 <CE,EE,ME>  CR: 24714222  XER: 00000000
> > TASK = ef830000[1] 'swapper' THREAD: ef834000
> > GPR00: 00000000 ef835c30 ef830000 f5500000 00000000 00300000
> > ef835bd8 00000000 GPR08: ef835b38 f5500014 00000000 000c0001
> > 24714284 8500682f ef8f7800 ef17c1c0 GPR16: 00000020 c05f0000
> > c06105de 00000000 ef835d08 c0610351 c056a6f0 c0610600 GPR24:
> > fffffff4 ef8ca47c ef9ffe00 ef9fff38 ef9e7c00 ef835cb8 ef8ea000
> > ef8ca400 NIP [c000a580] _memset_io+0x54/0x90 LR [c0399084]
> > radeon_fb_find_or_create_single+0x234/0x42c Call Trace:
> > [ef835c30] [c0399068] radeon_fb_find_or_create_single+0x218/0x42c
> > (unreliable)
> 
> Again looks like the problem occurs when first accessing VRAM, in this
> case for clearing the visible framebuffer contents. 
> 
> I wonder if we're missing something to handle device memory access
> properly on your machine(s)... Is ioremap_wc() working on them with
> other drivers? 
> 
> 

i got a kernel panic also with the legacy radeon framebuffer


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