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i.MX6Q - LDB clock's parent selection

Question asked by Abdul Raseeth Ansari on May 19, 2015
Latest reply on Jun 2, 2015 by alejandrolozano

Hi,

 

We are using imx6Q custom platform for our development which is based on sabresd platform.

We are using Linux 3.14.28_1.0.0-GA BSP for our development. But initially we used Linux 3.10.53_1.0.0-GA BSP.

 

From Linux 3.10.53_1.0.0-GA BSP, we have referred the below Linux kernel clock file.

          ~/linux-imx/arch/arm/mach-imx/clk-imx6q.c

We understood that the below function will set the LDB clock parent and the default LDB clock parent is "pll2_pfd0_352m".

"init_ldb_clks"

 

But In Linux 3.14.28_1.0.0-GA BSP, we couldn't identify the parent clock of LDB clock.   Please help us to understand

 

In our custom board, we are having LVDS0 800x480 display which is working with Linux 3.10.53_1.0.0-GA BSP.

The issue we are facing is, 

In Linux 3.14.28_1.0.0-GA BSP,  we have modified the corresponding lvds0 timing parameters in device tree. Now we are not getting the LVDS0 display. 

But if we keep the clock frequency as 65Mhz (as used in ~/linux-imx/arch/arm/boot/dts/imx6qdl-sabresd.dtsi) then we are able to get the display.

Please note that, we have changed only clock frequency value and other timing parameters are kept for 800x480 resolution.

 

We believe, the LDB clock's parent is the problem for our above issue.

 

Please help us to resolve the issue.

 

Thank You,

Regards,

Ansari

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