linux-kernel - [RFC PATCH] soc: mediatek: Add support always on flag

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Date:   Tue, 2 Nov 2021 15:20:58 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>,
        Chun-Jie Chen <chun-jie.chen@...iatek.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Subject: [RFC PATCH] soc: mediatek: Add support always on flag

There is a t-phy shared by PCIe and USB3 on mt8195, if the t-phy is
used by PCIe, when power off its mtcmos, need software reset it
(workaround way, usually hardware do it, but has an issue on mt8195),
but it has side effect to USB2 phy(works with USB3 phy to support
USB3.2 Gen1), so add support GENPD_FLAG_ALWAYS_ON flag, and make its
power always on;
Another reason is that USB3.2 Gen1/2 need keep power always on when
support runtime-pm due to hardware limitation until now;

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/soc/mediatek/mt8195-pm-domains.h | 2 +-
 drivers/soc/mediatek/mtk-pm-domains.c    | 2 ++
 drivers/soc/mediatek/mtk-pm-domains.h    | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/mediatek/mt8195-pm-domains.h b/drivers/soc/mediatek/mt8195-pm-domains.h
index 1379aa39bf16..b6949874c72b 100644
--- a/drivers/soc/mediatek/mt8195-pm-domains.h
+++ b/drivers/soc/mediatek/mt8195-pm-domains.h
@@ -67,7 +67,7 @@ static const struct scpsys_domain_data scpsys_domain_data_mt8195[] = {
 		.ctl_offs = 0x334,
 		.pwr_sta_offs = 0x174,
 		.pwr_sta2nd_offs = 0x178,
-		.caps = MTK_SCPD_ACTIVE_WAKEUP,
+		.caps = MTK_SCPD_ALWAYS_ON,
 	},
 	[MT8195_POWER_DOMAIN_CSI_RX_TOP] = {
 		.name = "csi_rx_top",
diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 61973a306e97..b89e5e3e3363 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -446,6 +446,8 @@ generic_pm_domain *scpsys_add_one_domain(struct scpsys *scpsys, struct device_no
 
 	if (MTK_SCPD_CAPS(pd, MTK_SCPD_ACTIVE_WAKEUP))
 		pd->genpd.flags |= GENPD_FLAG_ACTIVE_WAKEUP;
+	if (MTK_SCPD_CAPS(pd, MTK_SCPD_ALWAYS_ON))
+		pd->genpd.flags |= GENPD_FLAG_ALWAYS_ON;
 
 	if (MTK_SCPD_CAPS(pd, MTK_SCPD_KEEP_DEFAULT_OFF))
 		pm_genpd_init(&pd->genpd, NULL, true);
diff --git a/drivers/soc/mediatek/mtk-pm-domains.h b/drivers/soc/mediatek/mtk-pm-domains.h
index daa24e890dd4..419d23d5e394 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.h
+++ b/drivers/soc/mediatek/mtk-pm-domains.h
@@ -8,6 +8,7 @@
 #define MTK_SCPD_SRAM_ISO		BIT(2)
 #define MTK_SCPD_KEEP_DEFAULT_OFF	BIT(3)
 #define MTK_SCPD_DOMAIN_SUPPLY		BIT(4)
+#define MTK_SCPD_ALWAYS_ON		BIT(5)
 #define MTK_SCPD_CAPS(_scpd, _x)	((_scpd)->data->caps & (_x))
 
 #define SPM_VDE_PWR_CON			0x0210
-- 
2.25.1