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

[Christian Zigotzky]

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



-------------- next part --------------
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 at AmigaoneX1000.lan>
Your name and email address were configured automatically based
on your username and hostname. Please check that they are accurate.
You can suppress this message by setting them explicitly. Run the
following command and follow the instructions in your editor to edit
your configuration file:

    git config --global --edit

After doing this, you may fix the identity used for this commit with:

    git commit --amend --reset-author

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