Thanks, Kevin. On Thu, Jan 20, 2011 at 5:54 PM, Kevin Hilman <khilman@xxxxxx> wrote: > Luke Gong <lukejgong@xxxxxxxxx> writes: > >> I have a beagle board with OMAP3530. I ported linux-omap-pm2.6.32 to >> this board. When I want to let it suspend to ram, > > This is an old kernel. Any reason you're not using a newer kernel? I have Angstrom7 with kernel 2.6.32 running on this board. So I selected this old version to test. I might try the latest one. > >> it fails and I get >> the message "Class driver suspend failed for cpu0" > > This is the CPUfreq driver failing to suspend, probably because there is > no CPUfreq driver implemented in your kernel. Try disabling CPU_FREQ in > your kernel config. It seems can suspend to ram after disabling CPU_FREQ. Here is the log: 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) (use no_console_suspend to debug) ************************************************************* Once I hit the keyboard, I get: 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) (use no_console_suspend to debug) omapfb omapfb: timeout waiting for FRAME DONE Powerdomain (core_pwrdm) didn't enter target state 1 Powerdomain (cam_pwrdm) didn't enter target state 1 Powerdomain (per_pwrdm) didn't enter target state 1 Could not enter target state in pm_suspend Restarting tasks ... done. root@beagleboard:~# *************************************************** I am just curious why the powerdomain didn't enter target state 1. Another issue is about CPU frequency scaling. Using the original Angstrom7, I can scale CPU frequency. But with the linux-omap-pm kernel, I cannot do it even though I enable this feature in the config file. Is there any solution to support both cpu frequency scaling and suspend to ram? Thanks again for your help. > > Kevin > >> . Here is the log: >> >> 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) (use no_console_suspend to debug) >> omapfb omapfb: timeout waiting for FRAME DONE >> Class driver suspend failed for cpu0 >> Restarting tasks ... done. >> >> ********************************************* >> >> Is there any idea to fix this problem? Thanks. > -- Luke -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
