Op 20 nov 2008, om 18:38 heeft Kevin Hilman het volgende geschreven:
"Peter Reid" <ppeter.reid@xxxxxxxxx> writes:Hello kevin, Here is what i did to put it to suspend, which fails. [root@beagleboard]# echo mem > /sys/power/state PM: Syncing filesystems ... done. Freezing user space processes ... (elapsed 0.00 seconds) done. Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done. Suspending console(s) Class driver suspend failed for cpu0 PM: Some devices failed to power downHi Peter, Thanks for testing on Beagle. Do you mind sharing your .config? And, would you mind testing with the attached config? This PM branch will currently only work with a minimal set of drivers. Many of the current drivers will still prevent retention and OFF mode. Do you have CPUfreq enabled? I saw this 'class driver suspend' problem when I had CPUfreq enabled. This branch doesn't currently have CPUfreq support, so you can leave that disabled. I've also noticed problems on ES2 Beagle as well that I haven't figured out yet. Namely, I think the bootloader is leaving certain modules (namely DSS and IVA) in a state that is preventing hitting retention. Immediately after boot, the DSS powerdomain is still ON and it should be in retention, same for IVA but I haven't debugged this further on Beagle. The same kernel works on 3430SDP so that's why my hunch points to the u-boot. The kernel needs a way to ensure that after booting all the unused modules are in a state where they are not preventing idle. Even with disabled clocks, certain modules can prevent idle. Paul Walmsley has written the 'omapdev' layer which will now make it easier to do this boot-time init, but it is currently not there. We currently have to rely on bootloaders doing the right thing. The beagle bootloader does all sorts of stuff with DSS, MMC, audio etc. so it is a likely candidate.
Only the TI version does that, you'd be better of using the 'omap3' branch of the u-boot arm git, or Steve Sakomans git tree (which is where the upstream patches originate from). I don't know if that version fixed DSS and IVA, but it is a lot cleaner and saves a considerable amount of boot time :) A binary is located at:
http://www.angstrom-distribution.org/demo/beagleboard/u-boot.binThat binary also contains a fix for the 'l1neon' problem where the optimized version of ffmpeg or mplayer would crash under heavy load.
regards, Koen
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