Nouveau - Sep 2012 - [Bug 55449] New: Problems identifying card

https://bugs.freedesktop.org/show_bug.cgi?id=55449

          Priority: medium
            Bug ID: 55449
          Assignee: nouveau at lists.freedesktop.org
           Summary: Problems identifying card
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: dbaryshkov at gmail.com
          Hardware: PowerPC
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

I'm trying to bootstrap nouveau on the NV15 (Geforce 2 GTS / Asus V7700 TVR)
card on my PowerPC board. System hangs early if the driver is made builtin into
the kernel. I tried building the  driver as module and here is the log:


nouveau 0000:f0:10.0: enabling device (0000 -> 0002)
nouveau 0000:f0:10.0: enabling bus mastering
[drm] nouveau 0000:f0:10.0: Detected an NV30 generation card (0xa3005001)
[drm] nouveau 0000:f0:10.0: Unable to get the OF node
[drm] nouveau 0000:f0:10.0: Checking PRAMIN for VBIOS
[drm] nouveau 0000:f0:10.0: ... BIOS signature not found
[drm] nouveau 0000:f0:10.0: Checking PROM for VBIOS
[drm] nouveau 0000:f0:10.0: ... appears to be valid
[drm] nouveau 0000:f0:10.0: Using VBIOS from PROM
[drm] nouveau 0000:f0:10.0: BMP BIOS found
[drm] nouveau 0000:f0:10.0: BMP version 5.6
[drm] nouveau 0000:f0:10.0: Bios version 02.15.01.14
[drm] nouveau 0000:f0:10.0: No useful DCB data in VBIOS
[drm] nouveau 0000:f0:10.0: MXM: no VBIOS data, nothing to do
[drm] nouveau 0000:f0:10.0: Adaptor not initialised, running VBIOS init tables.
[drm] nouveau 0000:f0:10.0: PTIMER: unknown input clock freq
[TTM] Zone  kernel: Available graphics memory: 501592 kiB
[TTM] Initializing pool allocator
[TTM] Initializing DMA pool allocator
[drm] nouveau 0000:f0:10.0: Detected 0MiB VRAM (SDRAM)
[drm] nouveau 0000:f0:10.0: 128 MiB GART (aperture)
[drm:drm_mm_takedown] *ERROR* Memory manager not clean. Delaying takedown
[drm:drm_mm_takedown] *ERROR* Memory manager not clean. Delaying takedown
[TTM] Finalizing pool allocator
[TTM] Finalizing DMA pool allocator
[TTM] Zone  kernel: Used memory at exit: 9 kiB
nouveau: probe of 0000:f0:10.0 failed with error -22


System information: PowerPC 970FX, Linux v3.6-rc7. AGP GART support is disabled
as AGP is not working properly on this system.

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--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
OK, so the fundamental problem is that it's being detected as a NV30 card
instead of NV15 due to a lack of byteswapping when reading in the the PMC.ID
register (which should have come out as 0x015000a3). Once that goes wrong, all
bets are off.

I know that another user was pretty close to getting a NV4x card to work (benh,
the ppc maintainer), which would largely go through the same init paths (at
least as far as mmio reads/writes are concerned). Could you test a more recent
kernel (like 3.10 or 3.11) and see if this particular issue is still there?

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|Problems identifying card   |[NV15] Problems identifying
                   |                            |card on PPC big endian

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
No retest in a month, closing as invalid.

Note that NV15 did not have built-in big endian support for at least some
stuff, not sure if nouveau handles that. But at least I thought that for basic
MMIO stuff, it was supposed to work...

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