soc: renesas: rcar-sysc: Keep wakeup sources active during system suspend

If an R-Car SYSC slave device is part of the CPG/MSTP or CPG/MSSR Clock
Domain and to be 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.  However, the proper way to prevent the
device from being stopped is to inform this requirement to the genpd
core, by setting the GENPD_FLAG_ACTIVE_WAKEUP flag.

Note that this will only affect devices configured as wakeup sources.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/soc/renesas/rcar-sysc.c b/drivers/soc/renesas/rcar-sysc.c
index 55a47e5..52c25a5 100644 (file)
--- a/drivers/soc/renesas/rcar-sysc.c
+++ b/drivers/soc/renesas/rcar-sysc.c
@@ -224,7 +224,7 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
 
        if (!(pd->flags & (PD_CPU | PD_SCU))) {
                /* Enable Clock Domain for I/O devices */
-               genpd->flags |= GENPD_FLAG_PM_CLK;
+               genpd->flags |= GENPD_FLAG_PM_CLK | GENPD_FLAG_ACTIVE_WAKEUP;
                if (has_cpg_mstp) {
                        genpd->attach_dev = cpg_mstp_attach_dev;
                        genpd->detach_dev = cpg_mstp_detach_dev;