Hi Kevin, On 11/07/2013 06:02 PM, Kevin Hilman wrote: > Daniel Mack <zon...@gmail.com> writes: [..] >> + .resume_noirq = edma_pm_resume, >> +}; > > Also, I believe it was already suggested by Nishanth, but the late/early > callbacks are probably more appropriate here than the noirq callbacks. > Unless there's a *really* good reason to use the noirq callbacks, they > should be avoided. > > That being said, I wonder if the whole approach here is the right one. > I know you're basing your stuff on some TI tree, but that doesn't make > it the right way (usually, it's the opposite, but I digress...) ;) > > IMO, EDMA should be done like we currently do I2C and not implement > suspend/resume at all. Instead, the driver should do runtime PM done on
But a potential problem with this is powering edma on or off between xfers may slow things down quite a bit because xfers happen so much often and there is some overhead in the pm_runtime calls which adds up overtime when dealing with something as frequent as EDMA. Also we would lose the global EDMA context right so we'd have to restore the context every time during runtime PM (?). I had a patch that also made AES driver not pm_runtime_get/put specially when the next crypto request was imminent. But instead adopted a softer approach where the pm_runtime_put call would happen at a time when we are sure we're at the end of all requests. This resulted in quite a speed up. thanks, -Joel -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
