LCD shield with upstream kernel?

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fvolk
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LCD shield with upstream kernel?

Post by fvolk »

I currently run the LCD shield with an old Odroid image on a C2.

Almost all of my other C2s and C4s run 5.7.7 currently, so thinking of an upgrade,
before I try it myself, maybe someone can comment whether an upgrade to
a C2 or even C4 with a current kernel will work?

Or alternatively, what patches/how many patches I have to apply to get a text console with framebuffer for a status display, X support is not needed.

Thank you for an estimate :-)

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Re: LCD shield with upstream kernel?

Post by odroid »

I don't think upstream kernel support the 3.5inch LCD shield.
You might need to port the flexfb driver with hktft35 configuration.
https://wiki.odroid.com/accessory/displ ... uch_driver

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Re: LCD shield with upstream kernel?

Post by fvolk »

There's now a bunch of "tiny lcd" drivers in 5.8 - does this help in any way?
linux58.png
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Re: LCD shield with upstream kernel?

Post by mad_ady »

My c2 with 3.5" is still on 18.04. Haven't had the courage to try to upgrade it yet. Would love to see it supported on mainline

brad
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Re: LCD shield with upstream kernel?

Post by brad »

I'm going to try viewtopic.php?p=309332#p309332 and report back

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Re: LCD shield with upstream kernel?

Post by brad »

I have taken a good look at the LCD schematics and the proposed kernel driver for the display ili9488 https://patchwork.kernel.org/project/dr ... gmail.com/

As the driver is for 4 wire spi but I think the 3.5" shield is hardwired for MIPI DBI only we will need a different driver or add MIPI DBI support to the linked patch above. I was hoping to be able to communicate to the Shield via SPI but it appears this is not possible unless some of the unused pins on the shield link to the ili9488 spi interface pins.

When I have some more time will see if I can try to port hardkernel driver to mainline for MIPI-DBI interface integration.

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