i.MX6 IPU DI display clock generation.

[satoshishimoda]

Hi community,

I have two questions about i.MX6SDL IPU display clock generation.

Please see my questions below.

[Q1]

Please see chapter 38.1.10.3 in IMX6SDLRM.

It says "The DI clock can be derived from IPU's clock (HSP_CLK) or from an external source (via the DIn_DISP_CLK - ipp_di_#_ext_clk pin)".

Next, please see chapter 38.5.194.

The discription explains about display clock generation only mede from HSP_CLK.

But I think I can generate display clock from external source by setting this field if I select external source by di0_clk_ext in chapter 38.5.193.

[Q2]

I want to confirm how to set the fractional part of dix_disp_clk_period in chapter 38.5.194.

I understand display clock will be" HSP_CLK / (1 + 1/16)" if I set dix_disp_clk_period = 0x011.

And it will be "HSP_CLK / (1+ 1/2)" if I set dix_disp_clk_period = 0x018.

Is my understanding correct?

Best Regards,

Satoshi Shimoda

[Yuri · Accepted solution]

You are right :
1.
It is possible to use "display clock from external source by setting this field if I select external source by di0_clk_ext in chapter 38.5.193."

2.
Correct.