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soc: renesas: rcar-sysc: Make PM domain initialization more robust 

The quirk for R-Car E3 ES1.0 added in commit 086b399965 ("soc:
renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}") makes the 3DG-A
PM domain a subdomain of the 3DG-B PM domain.  However, registering
3DG-A with its parent fails silently, as the 3DG-B PM domain hasn't been
registered yet, and such failures are never reported.

Fix this by:
  1. Splitting PM Domain initialization in two steps, so all PM domains
     are registered before any child-parent links are established,
  2. Reporting any failures in establishing child-parent relations.

Check for and report pm_genpd_init() failures, too, as that function
gained a return value in commit 7eb231c337 ("PM / Domains: Convert
pm_genpd_init() to return an error code").

Fixes: 086b399965 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven 2018-06-05 17:05:15 +02:00 committed by Simon Horman
parent 086b399965
commit 977d5ba450
1 changed files with 29 additions and 6 deletions
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35
drivers/soc/renesas/rcar-sysc.c
View File

@ -194,11 +194,12 @@ static int rcar_sysc_pd_power_on(struct generic_pm_domain *genpd)
static bool has_cpg_mstp;
static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
static int __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
{
struct generic_pm_domain *genpd = &pd->genpd;
const char *name = pd->genpd.name;
struct dev_power_governor *gov = &simple_qos_governor;
int error;
if (pd->flags & PD_CPU) {
/*
@ -251,7 +252,11 @@ static void __init rcar_sysc_pd_setup(struct rcar_sysc_pd *pd)
rcar_sysc_power_up(&pd->ch);
finalize:
pm_genpd_init(genpd, gov, false);
error = pm_genpd_init(genpd, gov, false);
if (error)
pr_err("Failed to init PM domain %s: %d\n", name, error);
return error;
}
static const struct of_device_id rcar_sysc_matches[] __initconst = {
@ -375,6 +380,9 @@ static int __init rcar_sysc_pd_init(void)
pr_debug("%pOF: syscier = 0x%08x\n", np, syscier);
iowrite32(syscier, base + SYSCIER);
/*
* First, create all PM domains
*/
for (i = 0; i < info->num_areas; i++) {
const struct rcar_sysc_area *area = &info->areas[i];
struct rcar_sysc_pd *pd;
@ -397,14 +405,29 @@ static int __init rcar_sysc_pd_init(void)
pd->ch.isr_bit = area->isr_bit;
pd->flags = area->flags;
rcar_sysc_pd_setup(pd);
if (area->parent >= 0)
pm_genpd_add_subdomain(domains->domains[area->parent],
&pd->genpd);
error = rcar_sysc_pd_setup(pd);
if (error)
goto out_put;
domains->domains[area->isr_bit] = &pd->genpd;
}
/*
* Second, link all PM domains to their parents
*/
for (i = 0; i < info->num_areas; i++) {
const struct rcar_sysc_area *area = &info->areas[i];
if (!area->name || area->parent < 0)
continue;
error = pm_genpd_add_subdomain(domains->domains[area->parent],
domains->domains[area->isr_bit]);
if (error)
pr_warn("Failed to add PM subdomain %s to parent %u\n",
area->name, area->parent);
}
error = of_genpd_add_provider_onecell(np, &domains->onecell_data);
out_put: