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+---- Thread: How to change DSI setting value from DTS (/showthread.php?tid=6441)
How to change DSI setting value from DTS - r.tanaka - 08-21-2018
Hi
I would like to customize DSI settings value (resolution, format, pouch etc.).
Therefore, I am planning to change the setting value from DTS.
Is there any document that describes how to change DTS and how to build it?
If it does not exist, I would like to know how to change DTS and build DTS.
The software and hardware used are as follows.
software : https://github.com/ayufan-pine64/linux-build (xenial-minimal-pine64-bspkernel-0.7.19-118.img.xz)
hardware : PINE A64+ 1GB
Thank you.
RE: How to change DSI setting value from DTS - dkryder - 08-22-2018
you want a DTC, device tree compiler, to both compile/de-compile[disassemble]
google device tree compiler
RE: How to change DSI setting value from DTS - r.tanaka - 08-22-2018
(08-22-2018, 12:22 AM)dkryder Wrote: you want a DTC, device tree compiler, to both compile/de-compile[disassemble]Hi dkryder
google device tree compiler
Thank you for answering.
I changed the DSI resolution with compile / de-compile.
Changed from default value as follows.
Then, a kernel panic will now occur on startup.
<default>
---------------------------------------------
2166 lcd_x = <0x400>;
2167 lcd_y = <0x258>;
---------------------------------------------
<modify>
---------------------------------------------
2166 lcd_x = <0x216>;
2167 lcd_y = <0x4B0>;
---------------------------------------------
However, setting it to half of the default value starts normally.
<default>
---------------------------------------------
2166 lcd_x = <0x400>;
2167 lcd_y = <0x258>;
---------------------------------------------
<modify>
---------------------------------------------
2166 lcd_x = <0x200>;
2167 lcd_y = <0x12C>;
---------------------------------------------
Is there a limit to the setting value of DSI？
Thank you.
RE: How to change DSI setting value from DTS - dkryder - 08-22-2018
you probably want to stay with accepted display resolutions of that time and for that chip. 1024x600 [default] is WSVGA. 512X300 is probably a lesser known VGA. i suggest looking at tech reference or datasheet for chips on the pine64, the A64+ allwinner and mali 400 to get an idea of what display resolutions are possible and then modify based on that info. for the most part you can not get them to do anything they were not designed to do.
RE: How to change DSI setting value from DTS - r.tanaka - 08-22-2018
(08-22-2018, 11:11 AM)dkryder Wrote: you probably want to stay with accepted display resolutions of that time and for that chip. 1024x600 [default] is WSVGA. 512X300 is probably a lesser known VGA. i suggest looking at tech reference or datasheet for chips on the pine64, the A64+ allwinner and mali 400 to get an idea of what display resolutions are possible and then modify based on that info. for the most part you can not get them to do anything they were not designed to do.
Hi dkryder
I have reviewed the following reference manual.
・http://synfare.com/599N105E/hwdocs/pine64/Allwinner_A64_User_Manual_V1.0.pdf
・http://files.pine64.org/doc/datasheet/pine64/A64_Datasheet_V1.1.pdf
・http://synfare.com/599N105E/hwdocs/pine64/index.html
There was no explanation about the resolution of DSI.
RE: How to change DSI setting value from DTS - dkryder - 08-23-2018
apparently you did not either read them or comprehend them well but the documents do explain what display resolutions are possible on the board and it is up to you to give valid resolutions in the build compile, you can not just change numbers as you please and it may occur for some reason that a valid resolution does not compile for a reason that you will have to research further.
RE: How to change DSI setting value from DTS - r.tanaka - 08-27-2018
(08-23-2018, 11:38 AM)dkryder Wrote: apparently you did not either read them or comprehend them well but the documents do explain what display resolutions are possible on the board and it is up to you to give valid resolutions in the build compile, you can not just change numbers as you please and it may occur for some reason that a valid resolution does not compile for a reason that you will have to research further.
hi dkryder
What documentation describes the supported resolutions?
Or if you know the supported resolutions, please let me know.
Thank you.
RE: How to change DSI setting value from DTS - dkryder - 08-27-2018
look at page 65
2.1.5.2 Display Output of
http://synfare.com/599N105E/hwdocs/pine64/Allwinner_A64_User_Manual_V1.0.pdf
and then actually spend the time reading the other documents listed if you need additional information.
RE: How to change DSI setting value from DTS - r.tanaka - 08-28-2018
(08-27-2018, 10:40 AM)dkryder Wrote: look at page 65
2.1.5.2 Display Output of
http://synfare.com/599N105E/hwdocs/pine64/Allwinner_A64_User_Manual_V1.0.pdf
and then actually spend the time reading the other documents listed if you need additional information.
hi dkryder
It is described as "Support 4-lanes MIPI DSI up to 1920x1200@60fps"
It can be read that there is no problem if the resolution is up to 1920x1200.
Thank you.