i.MX Processors中的主题 Re: Question, i.MX6Q LDVS data length setting

Question, i.MX6Q LDVS data length setting

SLICE — Mon, 02 Oct 2017 00:23:35 GMT

Dear team,

Now my customer is using LDVS of i.MX6Q as 32bit data length.

And they want to change it into 16bit data length.

BTW they are using Linux as an OS.

Could you show me where to change for achieving their requirement?

The customer is using OpenGL(EGL), and they want to handle RGB565(16bit data).

But now they saw the accessing to memory is done by 32bit.

And they want to lower the data length into 16bit access, aiming to speed-up the accessing speed.

They have a doubt whether OpenGL(EGL) of i.MX6Q does support 16bit(RGB565) or not.

Does OpenGL(EGL) of i.MX6Q support RGB565?

Thanks,

Miyamoto

Re: Question, i.MX6Q LDVS data length setting

igorpadykov — Mon, 09 Oct 2017 23:29:42 GMT

Hi Miyamoto

>Does OpenGL(EGL) of i.MX6Q support RGB565?

yes, RGB565 format is supported by GPU according to Chapter 31,32

i.MX6DQ Reference Manual
http://cache.nxp.com/files/soft_dev_tools/doc/support_info/iMX6DQPRM.pdf

>The customer is using OpenGL(EGL), and they want to handle RGB565(16bit data).

>But now they saw the accessing to memory is done by 32bit.

>Could you show me where to change for achieving their requirement?

this is not implemented in original NXP BSP, one can use

NXP Professional Services for developing necessary customizations
http://www.nxp.com/support/nxp-professional-services:PROFESSIONAL-SERVICE

Best regards
igor
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Re: Question, i.MX6Q LDVS data length setting

SLICE — Tue, 10 Oct 2017 06:42:19 GMT

Hello igorpadykov‌

Thanks for your reply.

Is it possible for me to know how to achieve RGB565 as a general information?

Thanks,

Miyamoto

Re: Question, i.MX6Q LDVS data length setting

igorpadykov — Tue, 10 Oct 2017 07:37:32 GMT

Hi Miyamoto

one can look at implementation for CLAA WVGA LCD (uses RGB565)

described in Table 11. Common kernel boot parameters attached Release Notes

and Linux Manual with description for ipu/gpu drivers.

Best regards
igor

Re: Question, i.MX6Q LDVS data length setting

SLICE — Wed, 11 Oct 2017 07:46:00 GMT

Hi igorpadykov‌

Thanks for your support.

One quick question.

You sent me the link to the reference manual of i.MX6QuadPlus/DualPlus.

Actually, the customer is using i.MX6Quad.

Can I understand that GPU of i.MX6Quad also supports RGB565?

BR,

Miyamoto

Re: Question, i.MX6Q LDVS data length setting

igorpadykov — Wed, 11 Oct 2017 10:36:41 GMT

Hi Miyamoto

sorry for wrong link, yes GPU of i.MX6Quad also supports RGB565.

Best regards
igor