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<anarsoul>
kevery: mmind00: is it safe to assume that i2c0 clock and pinctrl is always configured if we're using rk808?
<kevery>
both clock and pinctrl are configured in dts and handled by clock/pinctrl driver framwork, isn't it?
<anarsoul>
not in ATF
<anarsoul>
mainline kernel can't power off any rk3399-based board with rk808 PMU
<anarsoul>
because it tries to power it off via PSCI which provides power off function
<anarsoul>
but ATF doesn't implement it
<anarsoul>
well, it's implemented as while (1) {}
<anarsoul>
so I'm working on i2c driver for ATF
<kevery>
we never have rk808 driver in ATF, we always power off the rk808 in kernel side.
<kevery>
Do you know how other soc implement this power off feature with psci enable?
<anarsoul>
kevery: A64 implements it in ATF
<anarsoul>
allwinner A64
<kevery>
We don't want to add too much driver in ATF
<anarsoul>
so does pretty much any other allwinner-based soc supported by ATF
<anarsoul>
kevery: well, then talk to upstream on how to handle that
<anarsoul>
I'm 99% sure that they'll recommend to implement it in ATF just like everyone else does
<anarsoul>
kevery: google boards actually can power off properly via PSCI since they don't use rk808 and they have some GPIOs for reset and power off
<anarsoul>
kevery: do you want me to start mail thread?
<anarsoul>
kevery: btw, i2c-rk3x driver in linux doesn't have atomic xfer function so it's not safe to use it for poweroff either
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<kevery>
I'm not expert at pmic/i2c, but I can sync with my colleague,
<anarsoul>
please do
<anarsoul>
power off is currently broken and it would be nice to fix it
<anarsoul>
(btw reboot is also broken for me but I don't know why yet)
<kevery>
The mainline kernel is not out main platform now, so not sure if they can spend much time on it :(
<kevery>
I think reboot is always work...
<anarsoul>
kevery: again it's done through PSCI, so likely something's broken in ATF
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<phh>
anarsoul: so this i2c bus must be dedicated to pmic? what's the idea for non trivial pmic? like multiple dcdc channel, 32kHz output, pmic GPIO for power button, etc.? recode all features in ATF and have a passthrough from Linux to ATF?
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<mmind00>
phh: I think it's only about the pweroff function of the i2c-connected pmic ...
<mearon_>
Has anybody been able to adjust the speaker volume via alsa on kevin?
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<sigmaris>
anarsoul: This might be of interest - reboot wasn't working for me with ATF master, though it did work with ATF v2.1
<sigmaris>
there's a part of ATF code which treats a NULL return value from plat_get_rockchip_gpio_reset() as indicating that GPIO reset shouldn't be used
<sigmaris>
but after that commit, plat_get_rockchip_gpio_reset() returns a valid pointer even if GPIO isn't meant to be used for reset
<sigmaris>
so ATF always tries to reset using GPIO, even on e.g. rockpro64 where it should just reset using CRU
<fALSO>
ix
<phh>
mmind00: so i2c bus is shared between linux and atf?
<mmind00>
phh: in that special case the kernel will be already finished with the i2c bus when it calls into psci to shutdown
<mmind00>
phh: if more pmic handling is necessary this will probably not work though
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<robmur01>
the worst case is when an emergency shutdown triggers while the I2C bus is wedged and the controller is halfway through a transfer to a different chip and the world is on fire etc.
<robmur01>
the potential complexity of getting things back to a known good state is the main argument for keeping it out of ATF
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<anarsoul>
robmur01: OK, any suggestions how to fix power off without adding i2c and rk808 drivers to ATF?
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<robmur01>
anarsoul: sadly, no :(
<robmur01>
I've just got used to holding down the button for however long
<anarsoul>
*sigh*
<anarsoul>
add DT property to rk808 to indicate that it's preferred power off method and override pm_power_off regardless of whether it's set or not?
<anarsoul>
sigmaris: thanks, I'll look into it
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<robmur01>
hmm, shouldn't ATF be able to shutdown by yanking NRESPWRON?
<robmur01>
I know it does the equivalent for RK805 with RK3328
<robmur01>
(although Linux is currently missing the ability to switch the configuration between suspend and poweroff as appropriate)
<anarsoul>
it's not wired to gpio
<robmur01>
ah, OK, well ultimately that's just a busted board design
<robmur01>
complicated workarounds ahoy!
<anarsoul>
we have what we have :)
<robmur01>
hmm, actually it looks like the RK808 SLEEP pin might be able to do double-duty as on RK805
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<robmur01>
no, scratch that, I'm completely misreading things :(
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