linux-kernel - [PATCH v4 15/16] soc: mediatek: pm-domains: Add default power off flag

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Message-Id: <20201030113622.201188-16-enric.balletbo@collabora.com>
Date:   Fri, 30 Oct 2020 12:36:21 +0100
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     matthias.bgg@...il.com, drinkcat@...omium.org, hsinyi@...omium.org,
        Collabora Kernel ML <kernel@...labora.com>,
        weiyi.lu@...iatek.com, fparent@...libre.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v4 15/16] soc: mediatek: pm-domains: Add default power off flag

From: Weiyi Lu <weiyi.lu@...iatek.com>

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>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---

Changes in v4:
- Check via scpsys_domain_is_on() if a power domain is on when removing.

Changes in v3: None
Changes in v2: None

 drivers/soc/mediatek/mtk-pm-domains.c | 25 ++++++++++++++++++-------
 drivers/soc/mediatek/mtk-pm-domains.h |  1 +
 2 files changed, 19 insertions(+), 7 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 8703d50cd2b7..c3b85b69f2f7 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -377,10 +377,16 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 	 * software.  The unused domains will be switched off during
 	 * late_init time.
 	 */
-	ret = scpsys_power_on(&pd->genpd);
-	if (ret < 0) {
-		dev_err(scpsys->dev, "%pOF: failed to power on domain: %d\n", node, ret);
-		goto err_unprepare_clocks;
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF)) {
+		if (scpsys_domain_is_on(pd))
+			dev_warn(scpsys->dev,
+				 "%pOF: A default off power domain has been ON\n", node);
+	} else {
+		ret = scpsys_power_on(&pd->genpd);
+		if (ret < 0) {
+			dev_err(scpsys->dev, "%pOF: failed to power on domain: %d\n", node, ret);
+			goto err_unprepare_clocks;
+		}
 	}
 
 	if (scpsys->domains[id]) {
@@ -394,7 +400,11 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 	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 scpsys->pd_data.domains[id];
@@ -467,6 +477,9 @@ static void scpsys_remove_one_domain(struct scpsys_domain *pd)
 {
 	int ret;
 
+	if (scpsys_domain_is_on(pd))
+		scpsys_power_off(&pd->genpd);
+
 	/*
 	 * We're in the error cleanup already, so we only complain,
 	 * but won't emit another error on top of the original one.
@@ -477,8 +490,6 @@ 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);
-
 	clk_bulk_unprepare(pd->num_clks, pd->clks);
 	clk_bulk_put(pd->num_clks, pd->clks);
 
diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
index 2c745f11b422..a2f4d8f97e05 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.h
+++ b/drivers/soc/mediatek/mtk-pm-domains.h
@@ -6,6 +6,7 @@
 #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
-- 
2.28.0