[PATCH v7 0/8] drm: sun8i: Add DE2 HDMI video support

[Jernej Skrabec]

Hi Maxime,

Dne torek, 29. november 2016 22.37.03 UTC+1 je oseba Maxime Ripard napisala:
>
> On Tue, Nov 29, 2016 at 11:18:35AM +0100, Jean-Francois Moine wrote: 
> > This patchset series adds HDMI video support to the Allwinner 
> > sun8i SoCs which include the display engine 2 (DE2). 
> > The driver contains the code for the A83T and H3 SoCs, and 
> > some H3 boards, but it could be used/extended for other SoCs 
> > (A64, H2, H5) and boards (Banana PIs, Orange PIs). 
>
> Honestly, I'm getting a bit worried by the fact that you ignore 
> reviews. 
>
> On the important reviews that you got that are to be seen as major 
> issues that block the inclusion, we have: 
>   - The fact that the HDMI driver is actually just a designware IP, 
>     and while you should use the driver that already exists, you just 
>     duplicated all that code. 
>
>  
That might be hard thing to do. A83T fits perfectly, but H3 and newer SoCs 
do
not. They are using completely different HDMI phy. Decoupling controller and
phy code means rewritting a good portion of the code, unless some tricks are
applied, like calling phy function pointers, if they are defined.

Register addresses also differ, but that can be easily solved by using
undocumented magic value to restore them.
 

>   - The fact that you ignored Rob (v6) and I (v5) comment on using OF 
>     graph to model the connection between the display engine and the 
>     TCON. Something that Laurent also pointed out in this version. 
>
>   - The fact that you ignored that you needed an HDMI connector node 
>     as a child of the HDMI controller. This has been reported by Rob 
>     (v6) and yet again in this version by Laurent. 
>
>   - And finally the fact that we can't have several display engine in 
>     parallel, if needs be. This has happened in the past already on 
>     Allwinner SoCs, so it's definitely something we should consider in 
>     the DT bindings, since we can't break them. 
>
> Until those are fixed, I cannot see how this driver can be merged, 
> unfortunately. 
>
> Maxime 
>
> -- 
> Maxime Ripard, Free Electrons 
> Embedded Linux and Kernel engineering 
> http://free-electrons.com


Best regards,
Jernej Škrabec 
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