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From: Andrzej Hajda <a.hajda@samsung.com>
To: linux-samsung-soc@vger.kernel.org
Cc: Andrzej Hajda <a.hajda@samsung.com>,
	Marek Szyprowski <m.szyprowski@samsung.com>,
	Kyungmin Park <kyungmin.park@samsung.com>,
	Kukjin Kim <kgene@kernel.org>,
	javier.martinez@collabora.co.uk, Liquid.Acid@gmx.net,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org
Subject: [RFC PATCH 2/3] arm/exynos/pm_domains: add support for async-bridge clocks
Date: Thu, 05 Feb 2015 13:35:38 +0100	[thread overview]
Message-ID: <1423139739-19881-3-git-send-email-a.hajda@samsung.com> (raw)
In-Reply-To: <1423139739-19881-1-git-send-email-a.hajda@samsung.com>

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.hajda@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 0e2bc36..ecff522 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;
 }
 
@@ -137,6 +147,15 @@ 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


  parent reply	other threads:[~2015-02-05 12:36 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-05 12:35 [RFC PATCH 0/3] Fix power domains handling on exynos542x Andrzej Hajda
2015-02-05 12:35 ` [RFC PATCH 1/3] arm/exynos: add asynchronous bridge clock bindings Andrzej Hajda
2015-02-05 12:35 ` Andrzej Hajda [this message]
2015-03-12 13:05   ` [RFC PATCH 2/3] arm/exynos/pm_domains: add support for async-bridge clocks Sylwester Nawrocki
2015-02-05 12:35 ` [RFC PATCH 3/3] ARM: dts: exynos5420: add async-bridge clock to disp1 power domain Andrzej Hajda
2015-02-05 14:45 ` [RFC PATCH 0/3] Fix power domains handling on exynos542x Javier Martinez Canillas
2015-02-06  5:27   ` Joonyoung Shim
2015-02-06  9:18     ` Javier Martinez Canillas
2015-02-06 10:55       ` [RFC PATCH v2 3/3] ARM: dts: exynos5420: add async-bridge clocks to disp1 power domain Andrzej Hajda
2015-02-06 11:27         ` Javier Martinez Canillas
2015-03-03  8:12           ` Javier Martinez Canillas
2015-03-12 13:00         ` Sylwester Nawrocki
2015-03-10  9:48   ` [RFC PATCH 0/3] Fix power domains handling on exynos542x Javier Martinez Canillas

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