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| spiiroin | eduardas_m: only suspend-to-ram is used; from sfos pov it is all driven by policy that is: suspend unless blocked from doing so (due to display being on / having active cpu-keepalive clients) | 11:18 |
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| spiiroin | eduardas_m: well, the act-dead mode has also: auto-power-off unless charging or alarms in the next couple of minutes | 11:18 |
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| eduardas_m | spiiroin: thank you, that is useful information... still, it is unclear to me how a Qt GUI application is supposed to properly initiate a suspend-to-ram, for example | 11:43 |
| eduardas_m | spiiroin: is everything done via systemd or is there some other daemon/component? | 11:43 |
| eduardas_m | spiiroin: also, I am not aware of how one distinguishes an active cpu-keepalive client from other running processes | 11:44 |
| eduardas_m | spiiroin: I am asking this because I am in the process of developing a handheld embedded Linux device using Yocto project/Open Embedded tools and wish to take inspiration from mer project and Sailfish OS on how to accomplish proper power management | 11:48 |
| spiiroin | eduardas_m: we basically want to suspend all the time i.e. applications can't initiate suspend - but they might need to block suspend (background processing while display is off kind of situations) | 11:53 |
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| spiiroin | eduardas_m: the policy is implemented in mce service. "cpu-keepalive" is basically dbus interface that applications can use to signal "I have things to do, do not suspend yet" | 11:55 |
| spiiroin | eduardas_m: from app programming pov nemo-keepalive library might be interesting place to take a peek https://git.merproject.org/mer-core/nemo-keepalive | 11:56 |
| spiiroin | eduardas_m: = convenience wrappers for libiphb (used for scheduling wakeups from suspend) and the keepalive stuff provided by mce via dbus | 11:57 |
| eduardas_m | spiiroin: mce is a mer-specific daemon, I suppose? also, I do not seem to find any mer core-specific documentation... is only Sailfish OS documentation available? | 11:57 |
| spiiroin | eduardas_m: yes, mce is at https://git.merproject.org/mer-core/mce/ - but this stuff is not really documented (it all happened via gradual evolution from maemo/meego display state policy -> take android style auto suspend with wakelocks into account too) | 12:00 |
| eduardas_m | spiiroin: is there at least a basic document on mer core architecture itself? i.e. components and their interoperation | 12:04 |
| eduardas_m | spiiroin: is it enough to just port mce, libphb and nemo-keepalive to my platform to implement mer-like suspend behaviour? | 12:08 |
| eduardas_m | I wonder just how bolted-together this stuff is... would I be better off with just taking inspiration from this code and re-implementing the basic idea? | 12:09 |
| spiiroin | eduardas_m: iphb is actually served by plugin run by dsme service, and suspend policy depends on availability of composer service which basically is either lipstick or act dead charging ui, etc | 12:13 |
| spiiroin | this topic just is something that is affecting/affected by lots of parts of mer/sfos, but | 12:16 |
| spiiroin | cutting corners & deactivating logic: mce is enough for suspend / resume due to hw triggers; dsme/iphb would add ability to wakeup from suspend via sw | 12:17 |
| spiiroin | since it still revolves around display state, either having a compositor (even a fake on) might be easier than trying to disable stuff | 12:19 |
| spiiroin | atm compositor in sfos is basically either lipstick or act-dead-charging-ui, and such thing is needed to negotiate orderly display power up/down - which needs to happen before autosuspend can be enabled | 12:20 |
| eduardas_m | spiiroin: this aspect is slightly different for me since I only have one Qt application using the eglfs backend, i.e. running without compositor | 12:20 |
| spiiroin | eduardas_m: from mce pov it is more about having party with whom to synchronize display power up/down rather than how display rendering is actually done | 12:22 |
| spiiroin | i.e. basically it just needs to implement compositor dbus interface that serves setUpdatesEnabled(bool) method calls | 12:23 |
| spiiroin | and take that in to account so that no rendering happens while updates are not enabled, rendering is ceased before replying disable method calls, and assuming rendering is disabled on startup | 12:24 |
| spiiroin | (some devices get kernel crashes if draw ops are made while autosuspend is enabled) | 12:25 |
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| eduardas_m | spiiroin: Thank you. Those are really valuable insights. Still, i'd like to ask a few last questions today: what is the best way to learn about inner workings of mer core? As far as I understand there is no mer core documentation website. Am I correct? | 13:15 |
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| spiiroin | eduardas_m: for the most part any docs you find about mer based stuff like sailfishos, asteroidos, glacier, ... are applicable to some degree. for example https://www.slideshare.net/FlorentRevest/asteroidos-architecture-of-a-foss-smartwatch-platform or https://sailfishos.org/wiki/SailfishOS | 13:46 |
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| eduardas_m | spiiroin: that is useful to know. thank you | 14:09 |
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