linux-kernel - [PATCH v3] soc: mediatek: add scpsys support active

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Date:	Wed, 26 Aug 2015 15:14:41 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Matthias Brugger <matthias.bgg@...il.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Daniel Kurtz <djkurtz@...omium.org>
CC:	Chunfeng Yun <chunfeng.yun@...iatek.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <srv_heupstream@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>
Subject: [PATCH v3] soc: mediatek: add scpsys support active_wakeup

Register gpd_dev_ops.active_wakeup function to support keep power
during suspend state. And add flag to each power domain to
decide whether keep power during suspend or not.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
Signed-off-by: Eddie Huang <eddie.huang@...iatek.com>
Acked-by: Sascha Hauer <s.hauer@...gutronix.de>
Reviewed-by: Daniel Kurtz <djkurtz@...omium.org>

---
Change in v3:
Remove check dev->power_domain NULL or ERR. This will not happen
when call scpsys_active_wakeup function

Change in v2:
Drop .active_wakeup = false lines in scp_domain_data[] array
---
 drivers/soc/mediatek/mtk-scpsys.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-scpsys.c b/drivers/soc/mediatek/mtk-scpsys.c
index 43a79ed..3a00975 100644
--- a/drivers/soc/mediatek/mtk-scpsys.c
+++ b/drivers/soc/mediatek/mtk-scpsys.c
@@ -67,6 +67,7 @@ struct scp_domain_data {
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
 	enum clk_id clk_id;
+	bool active_wakeup;
 };
 
 static const struct scp_domain_data scp_domain_data[] __initconst = {
@@ -127,6 +128,7 @@ static const struct scp_domain_data scp_domain_data[] __initconst = {
 		.sram_pdn_bits = GENMASK(11, 8),
 		.sram_pdn_ack_bits = GENMASK(15, 12),
 		.clk_id = MT8173_CLK_NONE,
+		.active_wakeup = true,
 	},
 	[MT8173_POWER_DOMAIN_MFG_ASYNC] = {
 		.name = "mfg_async",
@@ -171,6 +173,7 @@ struct scp_domain {
 	u32 sram_pdn_bits;
 	u32 sram_pdn_ack_bits;
 	u32 bus_prot_mask;
+	bool active_wakeup;
 };
 
 struct scp {
@@ -370,6 +373,17 @@ out:
 	return ret;
 }
 
+static bool scpsys_active_wakeup(struct device *dev)
+{
+	struct generic_pm_domain *genpd;
+	struct scp_domain *scpd;
+
+	genpd = pd_to_genpd(dev->pm_domain);
+	scpd = container_of(genpd, struct scp_domain, genpd);
+
+	return scpd->active_wakeup;
+}
+
 static int __init scpsys_probe(struct platform_device *pdev)
 {
 	struct genpd_onecell_data *pd_data;
@@ -427,12 +441,14 @@ static int __init scpsys_probe(struct platform_device *pdev)
 		scpd->sram_pdn_bits = data->sram_pdn_bits;
 		scpd->sram_pdn_ack_bits = data->sram_pdn_ack_bits;
 		scpd->bus_prot_mask = data->bus_prot_mask;
+		scpd->active_wakeup = data->active_wakeup;
 		if (data->clk_id != MT8173_CLK_NONE)
 			scpd->clk = clk[data->clk_id];
 
 		genpd->name = data->name;
 		genpd->power_off = scpsys_power_off;
 		genpd->power_on = scpsys_power_on;
+		genpd->dev_ops.active_wakeup = scpsys_active_wakeup;
 
 		/*
 		 * Initially turn on all domains to make the domains usable
-- 
1.9.1

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