Since Exynos5420 there are async-bridges (ASB) between different IPs. These
bridges must be operational during power domain on/off, ie. clocks used
by these bridges should be enabled.
This patch enabled these clocks during domain on/off.
Signed-off-by: Andrzej Hajda <a.ha...@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
Tested-by: Javier Martinez Canillas <javier.marti...@collabora.co.uk>
Reviewed-by: Sylwester Nawrocki <s.nawro...@samsung.com>
---
arch/arm/mach-exynos/pm_domains.c | 27 +++++++++++++++++++++++----
1 file changed, 23 insertions(+), 4 deletions(-)
diff --git a/arch/arm/mach-exynos/pm_domains.c
b/arch/arm/mach-exynos/pm_domains.c
index 37266a8..507dad0 100644
--- a/arch/arm/mach-exynos/pm_domains.c
+++ b/arch/arm/mach-exynos/pm_domains.c
@@ -37,6 +37,7 @@ struct exynos_pm_domain {
struct clk *oscclk;
struct clk *clk[MAX_CLK_PER_DOMAIN];
struct clk *pclk[MAX_CLK_PER_DOMAIN];
+ struct clk *asb_clk[MAX_CLK_PER_DOMAIN];
};
static int exynos_pd_power(struct generic_pm_domain *domain, bool power_on)
@@ -45,14 +46,19 @@ static int exynos_pd_power(struct generic_pm_domain
*domain, bool power_on)
void __iomem *base;
u32 timeout, pwr;
char *op;
+ int i;
pd = container_of(domain, struct exynos_pm_domain, pd);
base = pd->base;
+ for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+ if (IS_ERR(pd->asb_clk[i]))
+ break;
+ clk_prepare_enable(pd->asb_clk[i]);
+ }
+
/* Set oscclk before powering off a domain*/
if (!power_on) {
- int i;
-
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
if (IS_ERR(pd->clk[i]))
break;
@@ -81,8 +87,6 @@ static int exynos_pd_power(struct generic_pm_domain *domain,
bool power_on)
/* Restore clocks after powering on a domain*/
if (power_on) {
- int i;
-
for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
if (IS_ERR(pd->clk[i]))
break;
@@ -92,6 +96,12 @@ static int exynos_pd_power(struct generic_pm_domain *domain,
bool power_on)
}
}
+ for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+ if (IS_ERR(pd->asb_clk[i]))
+ break;
+ clk_disable_unprepare(pd->asb_clk[i]);
+ }
+
return 0;
}
@@ -131,6 +141,15 @@ static __init int exynos4_pm_init_power_domain(void)
pd->pd.power_off = exynos_pd_power_off;
pd->pd.power_on = exynos_pd_power_on;
+ for (i = 0; i < MAX_CLK_PER_DOMAIN; i++) {
+ char clk_name[8];
+
+ snprintf(clk_name, sizeof(clk_name), "asb%d", i);
+ pd->asb_clk[i] = clk_get(dev, clk_name);
+ if (IS_ERR(pd->asb_clk[i]))
+ break;
+ }
+
pd->oscclk = clk_get(dev, "oscclk");
if (IS_ERR(pd->oscclk))
goto no_clk;
--
1.9.1
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