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authorMarek Szyprowski <m.szyprowski@samsung.com>2012-07-12 17:29:54 +0900
committerKukjin Kim <kgene.kim@samsung.com>2012-07-12 17:29:54 +0900
commit76eb5567afd18aa0a61fd31cd80fb80b616aaba4 (patch)
treed340e70ceb523306a5c9fdefe9e240a81216cd1b
parentbd0a521e88aa7a06ae7aabaed7ae196ed4ad867a (diff)
ARM: EXYNOS: read initial state of power domain from hw registers
Some bootloaders disable unused power domains to reduce power consuption. Power domain driver can easily read the actual state from the hardware registers instead of assuming that their initial state is always 'on'. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
-rw-r--r--arch/arm/mach-exynos/pm_domains.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/arch/arm/mach-exynos/pm_domains.c b/arch/arm/mach-exynos/pm_domains.c
index e9fafcf163de..0a952a5c45bd 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -151,9 +151,12 @@ static __init int exynos4_pm_init_power_domain(void)
if (of_have_populated_dt())
return exynos_pm_dt_parse_domains();
- for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++)
- pm_genpd_init(&exynos4_pm_domains[idx]->pd, NULL,
- exynos4_pm_domains[idx]->is_off);
+ for (idx = 0; idx < ARRAY_SIZE(exynos4_pm_domains); idx++) {
+ struct exynos_pm_domain *pd = exynos4_pm_domains[idx];
+ int on = __raw_readl(pd->base + 0x4) & S5P_INT_LOCAL_PWR_EN;
+
+ pm_genpd_init(&pd->pd, NULL, !on);
+ }
#ifdef CONFIG_S5P_DEV_FIMD0
exynos_pm_add_dev_to_genpd(&s5p_device_fimd0, &exynos4_pd_lcd0);