topic Re: i.MX6SL behavior if OpenVG/OpenGL ES API is issued when GPU is power gated. in i.MX Processors

i.MX6SL behavior if OpenVG/OpenGL ES API is issued when GPU is power gated.

satoshishimoda — Fri, 05 Jun 2015 09:56:05 GMT

Hi community,

Our patner have a question about i.MX6SL GPU.
You know i.MX6SL GPU is able to be disabled by power gating by REG1_TARG in PMU_REG_CORE register of IMX6SLRM Rev.1.
Then, if OpenVG or OpenGL ES API is issued even tough GPU is power gated, what is happen?
GPU returns error? System stops since unexecutable API? or CPU emulate OpenVG/OpenGL ES API?

Best Regards,
Satoshi Shimoda

Re: i.MX6SL behavior if OpenVG/OpenGL ES API is issued when GPU is power gated.

igorpadykov — Fri, 05 Jun 2015 11:02:49 GMT

Hi Satoshi

most probably arm core raise exception as access to non-existent

address memory.

Best regards

igor

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Re: i.MX6SL behavior if OpenVG/OpenGL ES API is issued when GPU is power gated.

satoshishimoda — Wed, 10 Jun 2015 10:30:18 GMT

Hi Igor,

According to your reply, GPU library released by Vivante does not check whether GPU is powered-on when Open VG or Open GL ES API is issued.

So CPU will try access to GPU memory region.

Is this correct?

Best Regards,

Satoshi Shimoda

Re: i.MX6SL behavior if OpenVG/OpenGL ES API is issued when GPU is power gated.

igorpadykov — Wed, 10 Jun 2015 11:05:43 GMT

Hi Satoshi

in my reply I never mentioned about "GPU library".

Aslo if software build is configured to use GPU, it will

also configure to power it on.

Best regards

igor