Hi Kevin / Paul, I have tested this on beagle board as well as on OMAP3630 based propriatory phone using SDTI serial trace interface. Also you can test it by just observing the CM_EMU (48005100) clkstctrl register 48 => 00000001 Across MPU OFF alone [root@beagleboard /]# echo 0 > /sys/kernel/debug/pm_debug/neon_pwrdm/suspend [root@beagleboard /]# echo 0 > /sys/kernel/debug/pm_debug/mpu_pwrdm/suspend [root@beagleboard /]# echo 1 > /sys/kernel/debug/pm_debug/core_pwrdm/suspend [root@beagleboard /]# echo 1 > /sys/kernel/debug/pm_debug/per_pwrdm/suspend [root@beagleboard /]# echo mem >/sys/power/state [ 59.694671] PM: Syncing filesystems ... done. [ 59.758209] Freezing user space processes ... (elapsed 0.02 seconds) done. [ 59.789947] Freezing remaining freezable tasks ... (elapsed 0.02 seconds) done. [ 59.820709] Suspending console(s) (use no_console_suspend to debug) [ 60.055816] PM: suspend of devices complete after 212.493 msecs [ 60.059661] PM: late suspend of devices complete after 3.784 msecs [ 60.059753] Disabling non-boot CPUs ... [ 64.299865] Successfully put all powerdomains to target state [ 64.302551] PM: early resume of devices complete after 2.319 msecs [ 64.636444] PM: resume of devices complete after 332.336 msecs [ 64.688446] Restarting tasks ... done. [root@beagleboard /]# And then print again the CM_EMU (48005100) clkstctrl register offset 48 this will have the reset value and PRM_EMU (48307100) offset e4 => 00000100 register confirms the domain wakeup reset from OFF. At this moment the SDTI serial trace interface looses connection. With my patch applied the CM_EMU (48005100) clkstctrl register restores it initial setting across MPU OFF. Thanks Gowda -----Original Message----- From: Kevin Hilman [mailto:khilman@xxxxxx] Sent: 20 February 2012 17:30 To: Gowda Madhusudhan; Paul Walmsley Cc: linux-omap@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; tony@xxxxxxxxxxx Subject: Re: [GIT PULL] OMAP PM EMU fix for v3.3 +Paul Paul maintains the CM core code and should take this patch if he's OK with it. Also, it is most helpful if you describe what platforms it was tested on and exactly how you tested it. Thanks, Kevin <Madhusudhan.Gowda@xxxxxxxxxxxxxx> writes: > Hi Kevin, > > I think you have missed my last mail. Could you please ACK the pull > request and pull the same. > > Best Regards > Gowda > > > -----Original Message----- > From: linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx > [mailto:linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of > linux-arm-kernel-bounces+madhusudhan.gowda=elektrobit.com@lists.infrad > linux-arm-kernel-bounces+ea > d.org > Sent: 28 January 2012 09:58 > To: tony@xxxxxxxxxxx; khilman@xxxxxx > Cc: linux-omap@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Subject: RE: [GIT PULL] OMAP PM EMU fix for v3.3 > > Thanks Tony > > Hi Kevin > Please do the needful and pull the same. > > Best Regards > Gowda > > > -----Original Message----- > From: linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx > [mailto:linux-arm-kernel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of > Tony Lindgren > Sent: 27 January 2012 21:03 > To: Gowda Madhusudhan > Cc: Kevin Hilman; linux-omap@xxxxxxxxxxxxxxx; > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > Subject: Re: [GIT PULL] OMAP PM EMU fix for v3.3 > > Hi, > > * Madhusudhan.Gowda@xxxxxxxxxxxxxx <Madhusudhan.Gowda@xxxxxxxxxxxxxx> > [120127 10:25]: >> Hi Tony, >> >> Please pull the PM EMU off mode fix for v3.3 > > It's best that Kevin queues this as it affects PM. Or it at least > needs an ack from Kevin. > > Regards, > > Tony > >> Thanks >> Gowda >> >> The following changes since commit >> 1c6ece3c23e58d0dbc687407d606f3560ded582a: >> >> Merge branch 'omap_fixes_a_3.3rc' of git://git.pwsan.com/linux-2.6 >> (2012-01-26 16:48:37 -0800) >> >> are available in the git repository at: >> >> git://github.com/elektrobit/linux.git linux-omap-emu-fix >> >> Madhusudhan Gowda (1): >> ARM: OMAP3 PM:Save and restore EMU context across MPU OFF >> >> arch/arm/mach-omap2/cm2xxx_3xxx.c | 16 ++++++++++++---- >> arch/arm/mach-omap2/cm2xxx_3xxx.h | 2 ++ >> arch/arm/mach-omap2/pm34xx.c | 8 ++++++++ >> 3 files changed, 22 insertions(+), 4 deletions(-) >> >> >> ---------------------------------------------------------------- >> Please note: This e-mail may contain confidential information >> intended > >> solely for the addressee. If you have received this e-mail in error, >> please do not disclose it to anyone, notify the sender promptly, and >> delete the message from your system. >> Thank you. >> > > _______________________________________________ > linux-arm-kernel mailing list > linux-arm-kernel@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > > ---------------------------------------------------------------- > Please note: This e-mail may contain confidential information intended > solely for the addressee. 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