[Bug 30812] New: radeon module fails to initialize with modeset=1 on PPC32 with RV280

[Bug 30812] New: radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812

           Summary: radeon module fails to initialize with modeset=1 on
                    PPC32 with RV280
           Product: Drivers
           Version: 2.5
    Kernel Version: 2.6.35 to 2.6.38-rc6
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: bugzilla_kernel_org@nguyen.vg
        Regression: No


Created an attachment (id=50462)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50462)
output of dmesg after boot (radeon as module, modeset=0) and rmmod of radeon

Hardware: MacMini G4 (ppc-32).
Graphic adaptor: Radeon 9200 (RV280) probably a 'mac' version.
Symptoms:

with modprobe radeon modeset=0, everything works fine. Machine boots normally,
X works, xrandr and Xv too.

with modeset=1, modeprobe never returns and gets stucked durring
initialization.
More specifically, the call to radeon_fence_wait in r100_ib_test (r100.c) loops
endlessly (or at least for several hours). I'm attaching dmesg of a modified
driver with more printk.

I have tried several combination of putting AGPART/FBCON/RADEON in kernel or as
modules, tried with and without OFFB and so on, same results. Also attaching
output of lspci and .config used for the dmesg trace and output of radeontool
regs '*'.

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #1 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 13:59:27 ---
Created an attachment (id=50472)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50472)
dmesg of modified module after insmod radeon.ko modeset=1

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #2 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 13:59:54 ---
Created an attachment (id=50482)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50482)
output of radeontool regs '*'

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #3 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 14:00:22 ---
Created an attachment (id=50492)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50492)
output of lspci -vvv

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #4 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 14:01:06 ---
Created an attachment (id=50502)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50502)
.config used for dmesg

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #5 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 14:13:38 ---
Created an attachment (id=50512)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50512)
modified radeon_fence.c with additional DRM_INFO added.

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #6 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 14:28:03 ---
Actually after trying again with 2.6.35 I get an oops after modprobe radeon
modeset=1 which does is not present in 2.6.36 and after. dmesg attached.

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

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https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #7 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 14:29:08 ---
Created an attachment (id=50522)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=50522)
dmsg after segfault of modprobe radeon modeset=1 on 2.6.35

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

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https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #8 from Michel Dänzer <michel@daenzer.net>  2011-03-09 14:42:27 ---
Have you tried radeon.agpmode=1 or radeon.agpmode=-1? There's a uninorth AGP
driver issue which prevents higher AGP transfer rates from working reliably
with KMS.

Actually, I see you mentioned on IRC that you tried radeon.agpmode=-1 but it
didn't help. Can you provide the corresponding dmesg output? Maybe for =1 as
well.

One thing that seems special about your card is that the PCI aperture is larger
than VRAM. Maybe there's a problem related to that, e.g. a mixup or incorrect
handling of the various *_vram_size fields.

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

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https://bugzilla.kernel.org/show_bug.cgi?id=30812





--- Comment #9 from Kim Nguyen <bugzilla_kernel_org@nguyen.vg>  2011-03-09 15:32:53 ---
radeon.agpmode=1 works! Seems X is happy too, glxinfo shows direct rendering.
actually agpmode=-1 or agpmode > 1 both trigger the bug.

Would it be easy to default to 1 if uninorth agp is detected ? (maybe not worth
it, there are not so many ppc32 configs out there. So it might just be enough
to advertise on the radeon faq/howto page that agpmode=1 is recommended for
uninorth agp).

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[Bug 30812] radeon module fails to initialize with modeset=1 on PPC32 with RV280

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https://bugzilla.kernel.org/show_bug.cgi?id=30812


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|                            |OBSOLETE




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