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Renesas ARM Based SoC Fixes for v4.18 

Make PM domain initialization more robust in Renesas R-Car SYSC driver.
 This resolves a regression due to re-parenting of PM domains by
 086b399965 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}").
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Merge tag 'renesas-fixes-for-v4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas into fixes

Renesas ARM Based SoC Fixes for v4.18

Make PM domain initialization more robust in Renesas R-Car SYSC driver.
This resolves a regression due to re-parenting of PM domains by
086b399965 ("soc: renesas: r8a77990-sysc: Add workaround for 3DG-{A,B}").

* tag 'renesas-fixes-for-v4.18' of https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas:
  soc: renesas: rcar-sysc: Make PM domain initialization more robust

Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Olof Johansson 2018-06-23 10:16:55 -07:00
parent a514338b94 977d5ba450
commit cb04a79445
1 changed files with 29 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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: