[PATCHv6 4/4] drm/omap: add support for manually updated displays

[Tony Lindgren]

* Sebastian Reichel <sebastian.reichel at collabora.com> [190403 20:14]:
> This adds the required infrastructure for manually updated displays,
> such as DSI command mode panels. While those panels often support
> partial updates we currently always do a full refresh.
> 
> The display will be refreshed when something calls the dirty callback,
> such as libdrm's drmModeDirtyFB(). This is currently being done at least
> by the kernel console and Xorg (with modesetting driver) in their
> default configuration. Weston does not implement this and the fbdev
> backend does not work (display will not update). Weston's DRM backend
> uses double buffering and the page flip will also trigger a display
> refresh.

I've tested this with Linux next and the latest lm3532
patches and it works fine as long as we leave out the
backlight = <&lcd_backlight> entry from dts like I
replied in the lm3532 tread. So as far as I'm concerned,
we're good to go:

Tested-by: Tony Lindgren <tony at atomide.com>