i.MX Processors中的主题 Re: Configure LVDS display timings at runtime

Configure LVDS display timings at runtime

alexv — Fri, 09 Aug 2019 11:13:25 GMT

Hi!

I have a several LVDS Display to my i.MX6 board. Each display has a different timings and resolutions.

To not have multiple definition of displays in the device tree, I use the fbset command to define the resolution and timings in runtime.

I would like to make sure that the timings are set correctly but searching the datasheet I can't find any registers related to the timings.

Is this timing data stored in a register or is it stored by S.O.?

Re: Configure LVDS display timings at runtime

igorpadykov — Fri, 09 Aug 2019 23:13:21 GMT

Hi Alex

in i.MX6Q lvds timings are provided by IPU module, so

one can check its registers and description in i.MX 6Dual/6Quad Applications Processor Reference Manual

and linux driver in documentation provided on

i.MX Software | NXP

Best regards
igor
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Re: Configure LVDS display timings at runtime

alexv — Wed, 21 Aug 2019 14:59:39 GMT

Hi, Igor!

Thanks for the links.

I've been checking records for a couple of days but there are so many records for the IPU that I can't find the ones I need.
The only thing I need to check is that the timings match the ones in the device tree. Ex:

clock-frequency = <51200000>;
hactive = <1024>;
vactive = <600>;
hback-porch = <140>;
hfront-porch = <140>;
vback-porch = <25>;
vfront-porch = <16>;
hsync-len = <45>;
vsync-len = <4>;

Do you have any idea what they might be?

Re: Configure LVDS display timings at runtime

igorpadykov — Wed, 21 Aug 2019 15:18:54 GMT

Hi Alex

one can look on

Display Output, Resolution and Timings (Linux)

display-timing.txt\panel\display\bindings\devicetree\Documentation - linux-imx - i.MX Linux kernel

Best regards
igor