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Linux/AM3358: Hx-8328 display driver support

william wei
Prodigy 120 points
Part Number: AM3358
Other Parts Discussed in Thread: TFP410

Tool/software: Linux

Hello,

I'm using the am335x-evm board and want to develop new display driver for a Himax Hx-8238 LCD. I replaced the primary touch screen on am335-evm board with the Hx-8238 touch screen. Without any software change, after power on the board, I can see some distorted pictures and texts displayed on the new LCD. This certifies the hardware change is good.

I searched on the e2e forum and found below post:

http://e2e.ti.com/support/arm/sitara_arm/f/791/p/655526/2407874?keyMatch=himax&tisearch=Search-EN-Everything. 

From this post I got a solution  using fbtft

https://github.com/notro/fbtft.

According to the TI Wiki http://processors.wiki.ti.com/index.php/Linux_Core_LCD_Controller_User_Guide. 

The fbdev display driver is currently obsolete (has been since ti-linux-3.14.y), and is not actively maintained any more. Please use LCDC DRM driver instead. 

I want to know whether the above fbtft driver is supported on the latest processor SDK? 

Another question is how can I use the LCDC DRM driver to develop the driver for Hx-8238 device? 

Is it possible anybody can provide me instruction or reference code for above two questions?

thanks ahead!

William

  • 0
    TI__Mastermind 22386 points
    fbtft driver is not supported on processor SDK. Please check ti-tfp410 driver in drivers\gpu\drm\bridge, tilcdc_panel and tilcdc_tfp410 in drivers\gpu\drm\tilcdc. As well check the dts file for panel settings.
  • 0 in reply to Manisha Agrawal
    TI__Mastermind 22386 points
    Hi, we don't have DRM based reference panel driver example yet. It might be available in 3Q 2018 PLSDK release.

    Please don't refer to tfp410 drivers\gpu\drm\tilcdc. Instead refer to ti-tfp410 driver in drivers\gpu\drm\bridge. If your panel doesn't need any software programming, then you can use existing tilcdc_panel.c as is in drivers\gpu\drm\tilcdc. You only need to work with program timings in dts file.