Re: awindebe and awintcon [Was: Re: A20-Olinuxino-Lime2 + "internal" LCD question]

[Jared McNeill <jmcneill%invisible.ca@localhost>]

I seem to remember someone else having issues with 1680x1050. Can you try 
this change, which should force the display to 640x480?

--- awin_hdmi.c	17 Nov 2014 10:00:14 -0000	1.15
+++ awin_hdmi.c	8 Apr 2015 11:26:46 -0000
@@ -531,8 +531,10 @@ awin_hdmi_read_edid(struct awin_hdmi_sof
 	    sizeof(sc->sc_display_product));
 	sc->sc_current_display_mode = display_mode;

+#if 0
 	mode = ei.edid_preferred_mode;
 	if (mode == NULL)
+#endif
 		mode = pick_mode_by_ref(640, 480, 60);

 	if (mode != NULL) {



On Wed, 8 Apr 2015, Adrien Auzanneau wrote:

> Hi Jared,
> I am coming back on this topic as I am stuck and I can't get my head around 
> the right next step to make progress.
> I've seen recent support added for:
> awindebe(4)
> Add support for Allwinner A20/A31 Display engine backend (DE-BE). [jmcneill 
> 20141110]
> awintcon(4)
> Add support for Allwinner A20/A31 TV/LCD controller. [jmcneill 20141110]
>
> Which is OK from the dmesg output:
> awindebe0 at awinio0 port 0: Display Engine Backend (BE0)
> awintcon0 at awinio0 port 0: LCD/TV timing controller (TCON0)
> awinhdmi0 at awinio0: HDMI 1.3
> awinhdmi0: display connected
> awinhdmi0: DVI mode (auto-detected)
> genfb0 at awindebe0: switching to framebuffer console
> genfb0: framebuffer at 0xca000000, size 1680x1050, depth 32, stride 6720
> wsdisplay0 at genfb0 kbdmux 1: console (default, vt100 emulation)
> wsmux1: connecting to wsdisplay0
> wsdisplay0: screen 1-3 added (default, vt100 emulation)
>
>
> So it feels like it's recognized. I am using a bin generated from a .fex 
> setup for this specific 7" screen (from the script provided by olimex for 
> debian)
> fex is here: 
> http://packages.netbsdfr.org/HEAD/current/evbarm/olimex/a20-olinuxino-lime2/fex/a20olinuxinolime2-lcd7.fex
>
> For some reason I keep thinking it's the uEnv who's not passing the right 
> output...but I can't find the right way to set this up.
> Olimex aren't the only one to have these LCD screens, Odroid has one as well 
> for his C1. Is there a draft doc on how to get these to work?
>
> Any help appreciated.
> Thanks,
> -- ada