On 11/24/16 11:43, Tomi Valkeinen wrote: > What is the difference? If mode changes, you need to disable and enable > the crtc, right? What other cases there are to enable the display? After > blank? Then the display has been off, and I presume palette has to be > loaded. At the moment the palette or register values do not appear to vanish ever. But that is probably due to PM not doing much to optimize the LCDC power consumption. Anyway, if simple enable is enough to turn on the display - all video timings, frame buffer dma addresses etc. are already in the registers - then I think it is safe to assume that the palette is still in there too. Then it is a different issue, that I should probably put the same functionality into PM runtime_suspend() and runtime_resume() callbacks, that is currently in suspend() and resume() callbacks, to be ready if PM ever does anything more for LCDC that it does today. I could of course add a test if the registers are still intact before doing a restore. BR, Jyri
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