i.MX ProcessorsのトピックRe: imx6D Kernel display flicker

imx6D Kernel display flicker

jiujinhong — Tue, 10 Jul 2018 09:38:51 GMT

Hi,

Hardware support 2 LVDS Display, BSP support them adaptively. But one of them flicker in Linux kernel stage. If reboot through reboot cmd(WDOG1), it will not flicker.

I suspect that this is consistence issue which generate by U-boot/Kernel IPU/Clock settings?

BSP:

Linux 4.1.15 (Original BSP, not apply any patch)

U-boot 2015.4 (have applied U-boot patch from https://community.nxp.com/docs/DOC-98109 ).

Re: imx6D Kernel display flicker

igorpadykov — Tue, 10 Jul 2018 10:27:31 GMT

Hi jiu

one can check that both lvds clocks are enabled using procedure described in

EB821 LDB Clock Switch Procedure & i.MX6 Asynchronous Clock Switching Guidelines

https://www.nxp.com/docs/en/engineering-bulletin/EB821.pdf

Also one can check if lvds clock was not used by other module, as for example below

https://community.nxp.com/thread/465848

Best regards
igor
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Re: imx6D Kernel display flicker

jiujinhong — Wed, 11 Jul 2018 06:02:54 GMT

Hi Igor,

I have checked both, there are init_ldb_clocks in clk-imx6q.c which do you mentioned, and there are no other use LDB clock.

WHY the other display is good without flicker?