On Sat, Sep 26, 2015 at 11:01 AM, Geert Uytterhoeven <geert@xxxxxxxxxxxxxx> wrote:
> The smallest of these (udl) still counts in at ca. 2800 LoC,
Note udlfb.c, the original fbdev driver that I helped write and that the udl DRM driver was based on, is ~1800 LoC ... so we're actually talking in the ballpark of 2x (rather than 10x) between fbdev and DRM in this case. That said, the complexity difference is probably higher than the LoC difference. I know I personally have struggled in the shift from understanding fbdev to understanding DRM.
The fact that there's drivers of both types and USB hardware might make udl may be a good driver to use as a base for any additional simplification / helper work. David Airlie and David Herrmann both have this hardware. David Airlie did the port from fbdev to DRM, so he's made it an exemplary driver. And if anyone needs any hardware which works with udlfb and udl, we're happy to send free hardware to any programmers who are willing to contribute in the form of code or testing: http://plugable.com/projects/plugable-open-source-hardware-samples-program
More simplification and documentation would be great. In particular, the optimization for the connector+encoder+crtc combination others have mentioned seems like it would be worthwhile.
Cheers,
Bernie
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