Question, i.MX6DQ display rotation 180 degrees

[Aemj]

Dear Community,

I would like to ask about display rotation 180 degrees on i.MX6.

My customer is trying to rotate LCD display 180 degrees on i.MX6 with Freescale LinuxBSP.

He modified CPMEM parameter for IDMA currently contained in LinuxBSP as below.

VF(Vertical flip) bit =1 and HF(Horizontal flip) bit = 1.

As the result, vertical flip did work but horizontal flip does not work.

In my understanding,

The horizontal flip can work only when the IDMA is to transfer data from/to IRT.

Because the CPMEM parameter he modified is not the one for transferring data from/to IRT, horizontal flip does not work.

To achieve horizontal flip, one has to add new IDMA data transfer from/to IRT and has to set HF bit in its CPMEM parameter.

Am I correct?

BR,

Miyamoto

[YixingKong]

Miyamoto

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help please feel free to contact Freescale.

Thanks,
Yixing

[Aemj]

Hi Yixing,

Please let me clarify my understanding again.

The horizontal flip can work only when the IDMA is to transfer data from/to IRT.

Am I correct?

And,

In your LinuxBSP, IDMA is used for transfer from FB to DI.

To achieve FB rotation including horizontal flip, user has to add IDMA transfer between IRT.

Correct?

Miyamoto

[YixingKong]

Avnet Japan FAE

This discussion is closed since no action is needed. If you still need help, please feel free to reply with an update to this discussion, or create another discussion.

Thanks,

Yixing

[rogerio_silva]

Hi Miyamoto,

You're right. To perform rotation other than vertical flip, you'll have to use the IRT block.

Rgds,

Rogerio

[YixingKong]

rogeriopimentel, could you comfirm the customer's two questions?

Thanks,

Yixing

[SergioSolis]

Hello Miyamoto san

Perhaps, these 2 posts can help you:

Re: 90 degree or 270 degree rotation not working using fb0 rotate?

i.mx6 rotate screen 180