Hi Jean-François,

Dne petek, 25. november 2016 11.22.20 UTC+1 je oseba Jean-François Moine 
napisala:
>
> On Fri, 25 Nov 2016 17:41:51 +0800 
> Icenowy Zheng <ice...-ymACFijhrKM@public.gmane.org <javascript:>> wrote: 
>
> > After removing CLK_PLL_DE's assigned-clock, the kernel passes 
> compilation. 
>
> The 'pll-de' and 'de' must have a fixed rate. Otherwise, if you do not 
> use the legacy u-boot, I don't know which can be the rate of the DE. 
>
> > However, it cannot recognize any HDMI screen... 
> > 
> > (My board is Orange Pi One, and I manually added status="okay"; to 
> &lcd0, &de, &hdmi) 
> > 
> > [   16.507802] sun8i-de2 1000000.de-controller: bound 
> 1c0c000.lcd-controller (ops de2_lcd_ops [sun8i_de2_drm]) 
> > [   16.675948] sun8i-de2 1000000.de-controller: bound 1ee0000.hdmi (ops 
> de2_hdmi_fini [sun8i_de2_hdmi]) 
> > [   16.685120] [drm] Supports vblank timestamp caching Rev 2 
> (21.10.2013). 
> > [   16.695876] [drm] No driver support for vblank timestamp query. 
> > [   16.701862] sun8i-de2 1000000.de-controller: No connectors reported 
> connected with modes 
> > [   16.713061] [drm] Cannot find any crtc or sizes - going 1024x768 
> > [   16.734214] Console: switching to colour frame buffer device 128x48 
> > [   16.751022] sun8i-de2 1000000.de-controller: fb0:  frame buffer 
> device 
>
> I put a 'pr_warn' message is case the EDID cannot be read. 
> Have you this message? 
>
> Anyway, there is a problem with the EDID: 
> - my Orange Pi 2 (H3) randomly fails to read it. But this succeeds after 
>   rebooting once or twice. 
>

My U-Boot driver never exhibited a problem with reading EDID on OPi2. 
However,
I'm reusing code from Rockchip HDMI U-Boot driver for this (with some 
Allwinner
adjustments).
 

> - my Banana Pi M2+ (H3) reads it correctly each time. 
> - my Banana Pi M3 (A83T) can never read it. 
>
> BTW, on first tries, I was forcing a CEA mode thru the kernel command 
> line. This was working with the OPi2 and BPiM3, but there was no sound. 
> In the last version, I use a EDID in edid_firmware for having sound 
> with the BPiM3. This works fine. 
> But, forcing a CEA mode is no more possible, so, when the OPi2 cannot 
> read the EDID, the system switches to a VGA mode (default 1024x768) 
> which is not supported. It seems that this is your case. 
>
> So, in brief, if your board cannot read the EDID, put a EDID somewhere 
> and its path in /sys/module/drm_kms_helper/parameters/edid_firmware. 
> There will be no console, but X11 will work correctly. 
>
> -- 
> Ken ar c'hentañ        |              ** Breizh ha Linux atav! ** 
> Jef                |                http://moinejf.free.fr/


Best regards,
Jernej Škrabec 

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