When you want to scroll your display by just redrawing it all the time it is very slow (fullscreen redraws over spi are quite slow). However, the HX8357D (and others probably too) chipset supports hardware scrolling.
(horizontal wraparounf scrolling in landscape mode, or vertical in portrait)
This changeset adds a sysfs param to set the start scanline. by changing the start scanline the whole display is scrolled. You then only need to redraw the wrapped around scanlines instead of the whole screen.
When you want to scroll your display by just redrawing it all the time it is very slow (fullscreen redraws over spi are quite slow). However, the HX8357D (and others probably too) chipset supports hardware scrolling. (horizontal wraparounf scrolling in landscape mode, or vertical in portrait) This changeset adds a sysfs param to set the start scanline. by changing the start scanline the whole display is scrolled. You then only need to redraw the wrapped around scanlines instead of the whole screen.