Hardware 3D acceleration doesn't work anymore with the latest git kernel

[Christian Zigotzky <chzigotzky@xenosoft.de>]

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Hi All,

I tested the latest Git kernel version [1] on my Varisys Nemo board with 
a 64-bit dual-core PWRficient PA6T-1682M PowerPC CPU (A-EON AmigaOne 
X1000) [2] today. Unfortunately hardware 3D acceleration doesn't work 
anymore. It works without any problems with the kernel 4.14.0 [3].

Error messages:

dmesg | grep -i radeon

[    0.720715] [drm] radeon kernel modesetting enabled.
[    0.720832] radeon 0000:01:00.0: runtime IRQ mapping not provided by arch
[    0.894456] radeon 0000:01:00.0: VRAM: 1024M 0x0000000000000000 - 
0x000000003FFFFFFF (1024M used)
[    0.894468] radeon 0000:01:00.0: GTT: 1024M 0x0000000040000000 - 
0x000000007FFFFFFF
[    0.894617] [drm] radeon: 1024M of VRAM memory ready
[    0.894624] [drm] radeon: 1024M of GTT memory ready.
[    0.899823] [drm] radeon: dpm initialized
[    0.933524] radeon 0000:01:00.0: (-12) create WB bo failed
[    0.933532] radeon 0000:01:00.0: disabling GPU acceleration
[    0.938686] [drm] Radeon Display Connectors
[    1.447790] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[    1.448338] [drm] Initialized radeon 2.50.0 20080528 for 0000:01:00.0 
on minor 0
[   39.299034] radeon_dp_aux_transfer_native: 158 callbacks suppressed
[   70.924054] radeon_dp_aux_transfer_native: 158 callbacks suppressed
[  683.732444] radeon_dp_aux_transfer_native: 410 callbacks suppressed
[ 1049.062659] radeon_dp_aux_transfer_native: 74 callbacks suppressed

Problem:

[ 0.933524] radeon 0000:01:00.0: (-12) create WB bo failed
[ 0.933532] radeon 0000:01:00.0: disabling GPU acceleration

I was able to revert the first DRM updates [4]. This solved the problem 
with the hardware 3D acceleration on my Varisys Nemo board. That means 
the bug is somewhere in the first DRM updates [4].

Please find attached the DRM revert log.

Cheers,
Christian


[1] http://www.xenosoft.de/vmlinux-4.15-alpha3-AmigaOne_X1000_X5000.tar.gz
[2] https://en.wikipedia.org/wiki/AmigaOne_X1000
[3] http://www.xenosoft.de/vmlinux-4.14-AmigaOne_X1000_X5000.tar.gz
[4] 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=e60e1ee60630cafef5e430c2ae364877e061d980




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git revert e60e1ee60630cafef5e430c2ae364877e061d980 -m 1

Output:

[master c0fd66d] Revert "Merge tag 'drm-for-v4.15' of git://people.freedesktop.org/~airlied/linux"
 Committer: christian <christian@AmigaoneX1000.lan>
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You can suppress this message by setting them explicitly. Run the
following command and follow the instructions in your editor to edit
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    git config --global --edit

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    git commit --amend --reset-author

1039 files changed, 49563 insertions(+), 69996 deletions(-)
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