Hi Tomi,
On 03/20/2015 02:20 PM, Tomi Valkeinen wrote:
> On 25/02/15 19:03, grygorii.strashko@xxxxxxxxxx wrote:
>> From: Grygorii Strashko <Grygorii.Strashko@xxxxxxxxxx>
>>
>> Add handling of missed events in omap_dss_pm_notif which are
>> needed to support hibernation (suspend to disk).
>>
>> Signed-off-by: Grygorii Strashko <Grygorii.Strashko@xxxxxxxxxx>
>> ---
>> drivers/video/fbdev/omap2/dss/core.c | 4 ++++
>> 1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/video/fbdev/omap2/dss/core.c b/drivers/video/fbdev/omap2/dss/core.c
>> index 6b74f73..e60976a 100644
>> --- a/drivers/video/fbdev/omap2/dss/core.c
>> +++ b/drivers/video/fbdev/omap2/dss/core.c
>> @@ -178,11 +178,15 @@ static int omap_dss_pm_notif(struct notifier_block *b, unsigned long v, void *d)
>> DSSDBG("pm notif %lu\n", v);
>>
>> switch (v) {
>> + case PM_HIBERNATION_PREPARE:
>> case PM_SUSPEND_PREPARE:
>> + case PM_RESTORE_PREPARE:
>> DSSDBG("suspending displays\n");
>> return dss_suspend_all_devices();
>>
>> case PM_POST_SUSPEND:
>> + case PM_POST_HIBERNATION:
>> + case PM_POST_RESTORE:
>> DSSDBG("resuming displays\n");
>> return dss_resume_all_devices();
>>
>
> Why suspend displays when PM_RESTORE_PREPARE happens? Why resume when
> PM_POST_RESTORE happens?
We have following sequence when system is restored from hibernation:
- original kernel booted;
- late_initcall_sync(software_resume);
- pm_notifier_call_chain(PM_RESTORE_PREPARE);
- freeze_processes
- check & read hibernation image
- suspend all devices (.freeze())
- jump to stored kernel
- restore devices
...
So, all devices should be in frozen/suspended state when we will jump to stored kernel
(device's state should be the same as before creating hib image).
Without this patch I can see a lot of log messages like below:
[ 3.642499] Freezing user space processes ...
[ 3.647029] mmcblk1boot1: unknown partition table
[ 3.647043] (elapsed 0.000 seconds) done.
[ 3.686414] mmcblk1boot0: unknown partition table
[ 3.714552] PM: Using 1 thread(s) for decompression.
[ 3.714552] PM: Loading and decompressing image data (144641 pages)...
[ 4.520388] PM: Image loading progress: 0%
[ 5.153715] PM: Image loading progress: 10%
[ 5.847731] PM: Image loading progress: 20%
[ 6.622024] PM: Image loading progress: 30%
[ 7.023830] PM: Image loading progress: 40%
[ 7.455959] PM: Image loading progress: 50%
[ 8.137186] PM: Image loading progress: 60%
[ 8.567899] PM: Image loading progress: 70%
[ 9.670371] PM: Image loading progress: 80%
[ 10.130646] PM: Image loading progress: 90%
[ 10.525035] PM: Image loading progress: 100%
[ 10.529565] PM: Image loading done.
[ 10.533262] PM: Read 578564 kbytes in 6.80 seconds (85.08 MB/s)
[ 10.545313] Suspending console(s) (use no_console_suspend to debug)
[ 193.721284] PM: freeze of devices complete after 7.891 msecs
[ 193.722618] PM: late freeze of devices complete after 1.325 msecs
[ 193.723969] PM: noirq freeze of devices complete after 1.343 msecs
[ 193.724133] Disabling non-boot CPUs ...
[ 193.724792] CPU1: shutdown
[ 193.725387] PM: Creating hibernation image:
[ 193.725387] PM: Need to copy 144499 pages
[ 193.725439] Enabling non-boot CPUs ...
[ 193.725783] CPU1: smp_ops.cpu_die() returned, trying to resuscitate
[ 193.725790] CPU1: Booted secondary processor
[ 193.726069] CPU1 is up
[ 193.743772] PM: noirq restore of devices complete after 17.693 msecs
[ 193.744691] PM: early restore of devices complete after 0.634 msecs
[ 193.951382] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951389] [drm:omap_plane_error_irq] *ERROR* gfx: errors: 00000040
[ 193.951402] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951413] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951424] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951435] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951445] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951455] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951465] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951475] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951484] [drm:omap_crtc_error_irq] *ERROR* tv: errors: 00008000
[ 193.951567] omap_l3_noc 44000000.ocp: L3 application error: target 2 mod:1 (unclearable)
[ 193.951605] omap_l3_noc 44000000.ocp: L3 debug error: target 2 mod:1 (unclearable)
[ 194.293226] ata1: SATA link down (SStatus 0 SControl 300)
[ 194.560684] PM: restore of devices complete after 610.740 msecs
--
regards,
-grygorii
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