kcxtJan 21

me trying to understand linux display internals: "huh why does the display panel mode timing struct have a 'hskew' property?"

The doc-comment in the kernel:

Show threaddmi 💽 Jan 21
@cas i’m not sure i’m following - i’ve coded for at least one memory-mapped framebuffer which had each line aligned to %8, and the concept of horizontal skew makes perfect sense to me? is this something else?
Show threadkcxt
@domi that sounds like the right usecase, it's used in the qualcomm drivers so clearly it's used for something. it's just funny that whoever wrote the doc comment shared my bemusement at this being a thing for digital displays
Jan 21 at 4:40pmWeb
Show threaddmi 💽 Jan 21
@cas oh! yeah i think i’ve had the same reaction the very first time, now that i think about it
Show threadSaffron🏳️‍⚧️Jan 21
@domi @cas this and a few other things are residual from analog display technology that stuck around. proprietary implementations are usually way worse in this fashion lol
Show threaddmi 💽 Jan 21
@spinach @cas i wouldn’t call them residual, lots of those values map 1:1 to current concepts. even vblank is still a thing
Show threadSaffron🏳️‍⚧️Jan 21
@domi @cas well yeah there's a good reason they stuck around