linux-kernel - [PATCH 2/2] soc: mediatek: pm-domains: Add buck isolation setting in power domain

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Message-ID: <20230117032640.13504-3-allen-kh.cheng@mediatek.com>
Date:   Tue, 17 Jan 2023 11:26:40 +0800
From:   Allen-KH Cheng <allen-kh.cheng@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>
CC:     <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <angelogioacchino.delregno@...labora.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>,
        Allen-KH Cheng <allen-kh.cheng@...iatek.com>
Subject: [PATCH 2/2] soc: mediatek: pm-domains: Add buck isolation setting in power domain

In some chipsets, we need to disable EXT_BUCK_ISO before turning on the
specific power pm-domains (mtcmos), such as ADSP in MT8192 and CAM_VCORE
in MT8188.

Add the MTK_SCPD_EXT_BUCK_ISO flag to control the buck isolation setting
in the mediatek power domain driver.

Fixes: 59b644b01cf4 ("soc: mediatek: Add MediaTek SCPSYS power domains")
Signed-off-by: Allen-KH Cheng <allen-kh.cheng@...iatek.com>
---
 drivers/soc/mediatek/mtk-pm-domains.c | 8 ++++++++
 drivers/soc/mediatek/mtk-pm-domains.h | 1 +
 2 files changed, 9 insertions(+)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 474b272f9b02..be972e35b26e 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -218,6 +218,10 @@ static int scpsys_power_on(struct generic_pm_domain *genpd)
 	if (ret)
 		goto err_reg;
 
+	if (pd->data->ext_buck_iso_offs && MTK_SCPD_CAPS(pd, MTK_SCPD_EXT_BUCK_ISO))
+		regmap_clear_bits(scpsys->base, pd->data->ext_buck_iso_offs,
+				  pd->data->ext_buck_iso_mask);
+
 	/* subsys power on */
 	regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_BIT);
 	regmap_set_bits(scpsys->base, pd->data->ctl_offs, PWR_ON_2ND_BIT);
@@ -272,6 +276,10 @@ static int scpsys_power_off(struct generic_pm_domain *genpd)
 	if (ret < 0)
 		return ret;
 
+	if (pd->data->ext_buck_iso_offs && MTK_SCPD_CAPS(pd, MTK_SCPD_EXT_BUCK_ISO))
+		regmap_set_bits(scpsys->base, pd->data->ext_buck_iso_offs,
+				pd->data->ext_buck_iso_mask);
+
 	clk_bulk_disable_unprepare(pd->num_subsys_clks, pd->subsys_clks);
 
 	/* subsys power off */
diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
index a5f24c58e35a..5ec53ee073c4 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.h
+++ b/drivers/soc/mediatek/mtk-pm-domains.h
@@ -10,6 +10,7 @@
 #define MTK_SCPD_DOMAIN_SUPPLY		BIT(4)
 /* can't set MTK_SCPD_KEEP_DEFAULT_OFF at the same time */
 #define MTK_SCPD_ALWAYS_ON		BIT(5)
+#define MTK_SCPD_EXT_BUCK_ISO		BIT(6)
 #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data->caps & (_x))
 
 #define SPM_VDE_PWR_CON			0x0210
-- 
2.18.0