On Wed, 2009-03-11 at 09:46 +0100, ext Hiremath, Vaibhav wrote: > > Thanks, > Vaibhav Hiremath > > > -----Original Message----- > > From: Tomi Valkeinen [mailto:tomi.valkeinen@xxxxxxxxx] > > Sent: Wednesday, March 11, 2009 1:23 PM > > To: Hiremath, Vaibhav > > Cc: linux-omap@xxxxxxxxxxxxxxx > > Subject: Re: Suspend/Resume support with Omap2fb > > > > Hi, > > > > On Wed, 2009-03-11 at 07:55 +0100, ext Hiremath, Vaibhav wrote: > > > Hi, > > > > > > I am using New Frame-Buffer driver which is based on DSS2 library > > submitted by Tomi, and I am trying to add full power management > > support. But things are not working out as expected, every time when > > I am issuing command "echo mem > /sys/power/state" the system > > doesn't go into off state. It always points to dss_prwdm, below are > > the steps I am following - > > > > OFF mode should work. I have verified it with DSI, DPI and SDI. > > However, > > it needs passing the get_last_off_on_transaction_id pointer in > > omap_dss_platform_data. > > > > Also, see below. > > > [Hiremath, Vaibhav] I believe this is only required when you do save and restore context right? Well, yes. But you need to save and restore context if you want OFF mode. > Actually I have modified that part of code where it doesn't expect this pointer and save/restore happens perfectly fine, which I am very will sure about, since I am hitting state5 of CPU_IDLE (Full OFF state) and it resumes back with the same state. > > Again one more data point which I missed in last mail is, I am following clk->usecount which shows me 0. That means clocks are already disabled. > > root@arago:~# cat /sys/devices/platform/omap-dss/clk > - dss - > internal clk count 0 > dss_ick 83000000 0 > dss1_alwon_fck 96000000 0 > dss2_alwon_fck 13000000 0 > dss_tv_fck 54000000 0 > dss_96m_fck 96000000 0 > - dispc - > dispc fclk source = dss1_alwon_fclk > pixel clk = 96000000 / 1 / 5 = 19200000 > root@arago:~# > > > > > - Build the kernel with CPU_IDLE > > > - Enable all the PM flags > > > > > > # echo 1 > /sys/power/sleep_while_idle > > > # echo 1 > /sys/power/clocks_off_while_idle > > > # echo 1 > /sys/power/enable_off_mode > > > > > > - From Linux prompt issue command > > > > > > # echo mem > /sys/power/state > > > > > > The log is - > > > ------------ > > > > > > root@arago:~# echo mem > /sys/power/state > > > <6>PM: Syncing filesystems ... PM: Syncing filesystems ... done. > > > done. > > > Freezing user space processes ... Freezing user space processes > > ... (elapsed 0.00 seconds) (elapsed 0.00 seconds) done. > > > done. > > > Freezing remaining freezable tasks ... Freezing remaining > > freezable tasks ... (elapsed 0.06 seconds) (elapsed 0.06 seconds) > > done.done. > > > Suspending console(s) (use no_console_suspend to debug) > > > Suspending console(s) (use no_console_suspend to debug) > > > <6>omap-backlight: suspending... > > > omapfb_suspend > > > > > > omapfb_resume > > > <6>omap-backlight: resuming... > > > omap-backlight: suspending... > > > omapfb_suspend > > > Powerdomain (core_pwrdm) didn't enter target state 0 > > > Powerdomain (dss_pwrdm) didn't enter target state 0 > > > Powerdomain (per_pwrdm) didn't enter target state 0 > > > Could not enter target state in pm_suspend > > > eth0: link down > > > omapfb_resume > > > omap-backlight: resuming... > > > Restarting tasks ... Restarting tasks ... done. > > > done. > > > > > > root@arago:~# > > > > > > > > > Some analysis which I observed during debugging this issue - > > > > > > - The root-cause is, DSS PowerDomain always shows it is in ON > > state (PWRDM_POWER_ON), and if I understand correctly this is only > > dependent on clocks. But I am making sure that DSS clocks are > > disabled. And with CPU_IDLE enabled I am going to complete OFF > > state. (/sys/devices/system/cpu/cpu0/cpuidle/state5/usage is > > incrementing). > > > > > > - If I compile out framebuffer driver and include DSS2 and > > V4L2 driver, everything works fine. I am not sure how "omapfb" is > > being tied with PowerDomain. Again I have seen references in > > arch/arm/mach-omap2/omapdev3xxx.h to the pdev_name = "omapfb", not > > sure how this is being used. > > > > You have to change it to omapdss (or omap-dss in earlier DSS2 > > versions). > > > [Hiremath, Vaibhav] I have tried this option also, didn't work out. > Tomi, > > Do you have summary or list of changes required in clock and PowerDomain related files to make it work? > > How have you tested this? > Have you also tested with "echo mem > /sys/power/state"? > Are you using Kevin's power management tree? What is default configuration of your kernel during this test? It's been some time since I tested it, but it did work on OMAP3 SDP with the pm-branch. Only changed needed were the get_last_off_on_transaction_id and omapfb -> omapdss. I also tested echo mem > .... I'll try to find time to test it again with latest trees. 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