imx-gpu-viv-demos: differences between linux-imx and linux-fslc-imx kernels

[blemouzy]

Hello,

I'm working with Yocto Kirkstone on i.MX6 CPU (i.MX6D rev1.3 at 792MHz).

meta-freescale imx-gpu-viv recipe provides imx-gpu-viv-demos package which can be used to test the GPU. The script /unit_tests/GPU/gpu.sh run the following tests:

• /opt/viv_samples/vdk/tutorial3 -f 100
• /opt/viv_samples/vdk/tutorial4_es20 -f 100
• /opt/viv_samples/tiger/tiger

With linux-imx kernel:

• tutorial3 runs fine
• tutorial4_es20 runs fine with the following output:

  Rendered 100 frames in 659 milliseconds: 151.75 fps

• tiger runs fine with the following output:

  id=23, a,b,g,r=0,8,8,8, d,s=16,0, AA=0,openvgbit=79
  frames:100 -- fps:99.206345

  

But with linux-fslc-imx kernel:

• tutorial3 runs fine
• tutorial4_es20 runs fine with the following output:

  Rendered 100 frames in 1697 milliseconds: 58.93 fps

• tiger doesn't run fine (wrong display) with the following output:

  id=23, a,b,g,r=0,8,8,8, d,s=16,0, AA=0,openvgbit=79
  frames:100 -- fps:58.411217

Do you know:

• Why FPS are lower on linux-fslc-imx kernel than on linux-imx?
• What tiger test does that can explain wrong display with linux-fslc-imx kernel? (closed source code)

[blemouzy]

tiger test doesn't work due to missing libOpenVG.so link.

The link is located in the -dev package:

$ oe-pkgdata-util find-path /usr/lib/libOpenVG.3d.so.1.1.0
libopenvg-imx: /usr/lib/libOpenVG.3d.so.1.1.0

$ oe-pkgdata-util find-path /usr/lib/libOpenVG.so
libopenvg-imx-dev: /usr/lib/libOpenVG.so

But I still don't understand the low FPS issue.

[blemouzy]

And the low FPS issue is due to a different environment variable between our BSP (FB_MULTI_BUFFER=2). Unset it leads to same result between linux-fslc-imx and linux-imx.