linux-kernel - [PATCH v2 2/4] soc: mediatek: pm-domains: Add default power off flag

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Message-ID: <1603370857-30646-3-git-send-email-weiyi.lu@mediatek.com>
Date:   Thu, 22 Oct 2020 20:47:35 +0800
From:   Weiyi Lu <weiyi.lu@...iatek.com>
To:     Enric Balletbo Serra <eballetbo@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Nicolas Boichat <drinkcat@...omium.org>,
        Rob Herring <robh@...nel.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, Weiyi Lu <weiyi.lu@...iatek.com>
Subject: [PATCH v2 2/4] soc: mediatek: pm-domains: Add default power off flag

For some power domain, like conn on MT8192, it should be default OFF.
Because the power on/off control relies the function of connectivity chip
and its firmware. And if project choose other chip vendor solution,
those necessary connectivity functions will not provided.

Signed-off-by: Weiyi Lu <weiyi.lu@...iatek.com>
---
 drivers/soc/mediatek/mtk-pm-domains.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index b7ccf94..50a7ae1 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -24,6 +24,7 @@
 #define MTK_SCPD_ACTIVE_WAKEUP		BIT(0)
 #define MTK_SCPD_FWAIT_SRAM		BIT(1)
 #define MTK_SCPD_SRAM_ISO		BIT(2)
+#define MTK_SCPD_KEEP_DEFAULT_OFF	BIT(3)
 #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data->caps & (_x))
 
 #define SPM_VDE_PWR_CON			0x0210
@@ -506,17 +507,26 @@ static int scpsys_add_one_domain(struct scpsys *scpsys, struct device_node *node
 	 * software.  The unused domains will be switched off during
 	 * late_init time.
 	 */
-	ret = scpsys_power_on(&pd->genpd);
-	if (ret < 0) {
-		dev_err_probe(scpsys->dev, ret, "failed to power on domain %pOFN\n", node);
-		goto err_unprepare_clocks;
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) {
+		if (scpsys_domain_is_on(pd))
+			dev_warn(scpsys->dev,
+				 "A default off power domain %pOFN has been ON\n", node);
+	} else {
+		ret = scpsys_power_on(&pd->genpd);
+		if (ret < 0) {
+			dev_err_probe(scpsys->dev, ret, "failed to power on domain %pOFN\n", node);
+			goto err_unprepare_clocks;
+		}
 	}
 
 	pd->genpd.name = node->name;
 	pd->genpd.power_off = scpsys_power_off;
 	pd->genpd.power_on = scpsys_power_on;
 
-	pm_genpd_init(&pd->genpd, NULL, false);
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
+		pm_genpd_init(&pd->genpd, NULL, true);
+	else
+		pm_genpd_init(&pd->genpd, NULL, false);
 
 	scpsys->domains[id] = &pd->genpd;
 	return 0;
@@ -603,7 +613,8 @@ static void scpsys_remove_one_domain(struct scpsys_domain *pd)
 			"failed to remove domain '%s' : %d - state may be inconsistent\n",
 			pd->genpd.name, ret);
 
-	scpsys_power_off(&pd->genpd);
+	if (!MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
+		scpsys_power_off(&pd->genpd);
 
 	clk_bulk_unprepare(pd->num_clks, pd->clks);
 	clk_bulk_put(pd->num_clks, pd->clks);
-- 
1.8.1.1.dirty