Bug 55449

Summary: [NV15] Problems identifying card on PPC big endian
Product: xorg Reporter: Dmitry Eremin-Solenikov <dbaryshkov>
Component: Driver/nouveauAssignee: Nouveau Project <nouveau>
Status: RESOLVED INVALID QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: PowerPC   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Dmitry Eremin-Solenikov 2012-09-29 12:28:28 UTC 
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.
Comment 1 Ilia Mirkin 2013-08-19 15:59:55 UTC 
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?
Comment 2 Ilia Mirkin 2013-09-21 17:39:06 UTC 
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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