Jesse Barnes a écrit : >> Forgive my lack of global understanding of the whole issue but my >> conclusion is that we just can't disable vbl interrupt on hardware >> which lack vbl count in hardware, right ? >> > > That's one option, yes. > > The other option is to calculate how many vblank interrupts have > occurred between off and on periods. You could do this by recording > the time when interrupts were disabled, figuring out how much time has > passed between then and when they become enabled again, then dividing > by the refresh rate. That should work in theory, but I don't think > anyone's tried to do this in practice yet. > > Doing the latter will keep interrupts off more of the time, so it should > save more power. > That sound great but another harder to met criteria is for the drm layer to be able to keep track if the refresh rates change during an irq off period, right ?
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