Hi Rafael, Ulf, Kevin,
If a device in a Renesas ARM SoC is part of a Clock Domain, and it is
used as a wakeup source, it must be kept active during system suspend.
Currently this is handled in device-specific drivers by explicitly
increasing the use count of the module clock when the device is
configured as a wakeup source, or if it is part of the wakeup path.
However, this is merely a workaround. The proper way to prevent the
device from being stopped is to inform this requirement to the genpd
core, using the new GENPD_FLAG_ACTIVE_WAKEUP flag introduced in commit
95a20ef6f7e54c6a ("PM / Domains: Allow genpd users to specify default
active wakeup behavior").
Hence this series does that for PM Domain drivers used on R-Car, RZ/A1,
RZ/G1 SoCs, mimicking what is already done succesfully on SH/R-Mobile
SoCs. This will allow for the workarounds can be removed later.
This series was extracted from "[PATCH 00/10] PM / Domain: renesas: Fix
active wakeup behavior", and retains only fixes for Renesas PM Domain
drivers.
Changes compared to v1:
- Integrate follow-up patches to use GENPD_FLAG_ACTIVE_WAKEUP instead
of adding an "always true" callback.
As GENPD_FLAG_ACTIVE_WAKEUP exists in pm/linux-next only, and this
series is a dependency for the removal of workarounds in drivers of
multiple subsystems (net, irqchip, and gpio), I think it is a good idea
to still queue this for v4.15 in the PM tree, if possible.
This has been tested on r8a73a4/ape6evm, r8a7740/armadillo,
r8a7791/koelsch, r8a7795/salvator-x and -xs, r8a7795/salvator-x, and
sh73a0/kzm9g.
Thanks for applying!
Geert Uytterhoeven (3):
clk: renesas: mstp: Keep wakeup sources active during system suspend
clk: renesas: cpg-mssr: Keep wakeup sources active during system
suspend
soc: renesas: rcar-sysc: Keep wakeup sources active during system
suspend
drivers/clk/renesas/clk-mstp.c | 2 +-
drivers/clk/renesas/renesas-cpg-mssr.c | 2 +-
drivers/soc/renesas/rcar-sysc.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)
--
2.7.4
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
