Re: [PATCH 00/30] drm/sun4i: Refactor layer code for proper DE33 support

["Ryan Walklin" <ryan@testtoast.com>]

On Mon, 13 Oct 2025, at 8:23 AM, Jernej Skrabec wrote:
> Current DE33 support in sun4i-drm driver is based on my PoC code. It was
> written with *a lot* of hacks, because it was never meant to be upstreamed.
> Fortunately, DT parts were never merged which give us a chance to do it
> right.
>
> This is first of three series with proper DE33 support for H616 SoC. It's
> the longest, since it prepares terrain for new drivers in remaining series.
> Point of this work is to completely decouple mixer and layer code. Till
> DE3, mixer and layers were intimately connected. However, from DE33
> onwards, this is no longer the case. DE33 and upcoming DE35 planes are
> shared comodity between all mixers and can be assigned in any way driver
> (or user) prefers. This requires planes code to be completely independent
> from mixer. The only exception is mixer clock frequency which is used in
> VI scaler, but in that case mixer pointer is obtained through currently
> assigned CRTC.
>
> Second series will introduce separate driver for DE33 planes and adjust
> mixer code to new DT bindings. Third series will introduce TCON(-TOP)
> adjustments, HDMI PHY and finally, DT updates for several boards.
>
> Current WIP code for remaining two series can be found at [1]. Code has
> been tested on Tanix TX6, which has DE3, for any regressions and on Myir
> MYD-YT507H board [2], which has DE33, with HDMI and LVDS panel outputs
> running simultaneously and independently. This confirms that plane code
> is properly decoupled.
>
> Please review.

Thanks Jernej, can confirm that this patch series, when overlaid with the remaining out-of-tree patches and my previous LCD DT patch series, allows simultaneous HDMI and LCD output with separate framebuffers on the Anbernic RG35XX series of devices with the Allwinner H700.

> Best regards,
> Jernej
>

Tested-by: Ryan Walklin <ryan@testtoast.com>

Regards,

Ryan