linux-kernel - [PATCH v2 09/12] soc: mediatek: pm-domains: Allow bus protection to ignore clear ack

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Message-Id: <20201001160154.3587848-10-enric.balletbo@collabora.com>
Date:   Thu,  1 Oct 2020 18:01:51 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     linux-kernel@...r.kernel.org
Cc:     Collabora Kernel ML <kernel@...labora.com>, fparent@...libre.com,
        matthias.bgg@...il.com, drinkcat@...omium.org, hsinyi@...omium.org,
        weiyi.lu@...iatek.com, Matthias Brugger <mbrugger@...e.com>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: [PATCH v2 09/12] soc: mediatek: pm-domains: Allow bus protection to ignore clear ack

From: Matthias Brugger <mbrugger@...e.com>

In some cases the hardware does not create an acknowledgment of the
bus protection clearing. Add a flag to the bus protection indicating
that a clear event will be ignored.

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

Changes in v2: None

 drivers/soc/mediatek/mtk-pm-domains.c | 26 +++++++++++++++++---------
 1 file changed, 17 insertions(+), 9 deletions(-)

diff --git a/drivers/soc/mediatek/mtk-pm-domains.c b/drivers/soc/mediatek/mtk-pm-domains.c
index 2075072f16da..0222be12d0df 100644
--- a/drivers/soc/mediatek/mtk-pm-domains.c
+++ b/drivers/soc/mediatek/mtk-pm-domains.c
@@ -60,19 +60,23 @@
 
 #define SPM_MAX_BUS_PROT_DATA		3
 
-#define _BUS_PROT(_mask, _set, _clr, _sta, _update) {	\
-		.bus_prot_mask = (_mask),		\
-		.bus_prot_set = _set,			\
-		.bus_prot_clr = _clr,			\
-		.bus_prot_sta = _sta,			\
-		.bus_prot_reg_update = _update,		\
+#define _BUS_PROT(_mask, _set, _clr, _sta, _update, _ignore) {	\
+		.bus_prot_mask = (_mask),			\
+		.bus_prot_set = _set,				\
+		.bus_prot_clr = _clr,				\
+		.bus_prot_sta = _sta,				\
+		.bus_prot_reg_update = _update,			\
+		.ignore_clr_ack = _ignore,			\
 	}
 
-#define BUS_PROT_WR(_mask, _set, _clr, _sta)		\
-		_BUS_PROT(_mask, _set, _clr, _sta, false)
+#define BUS_PROT_WR(_mask, _set, _clr, _sta)			\
+		_BUS_PROT(_mask, _set, _clr, _sta, false, false)
+
+#define BUS_PROT_WR_IGN(_mask, _set, _clr, _sta)		\
+		_BUS_PROT(_mask, _set, _clr, _sta, false, true)
 
 #define BUS_PROT_UPDATE(_mask, _set, _clr, _sta)		\
-		_BUS_PROT(_mask, _set, _clr, _sta, true)
+		_BUS_PROT(_mask, _set, _clr, _sta, true, false)
 
 struct scpsys_bus_prot_data {
 	u32 bus_prot_mask;
@@ -80,6 +84,7 @@ struct scpsys_bus_prot_data {
 	u32 bus_prot_clr;
 	u32 bus_prot_sta;
 	bool bus_prot_reg_update;
+	bool ignore_clr_ack;
 };
 
 #define MAX_SUBSYS_CLKS 10
@@ -267,6 +272,9 @@ static int _scpsys_bus_protect_disable(const struct scpsys_bus_prot_data *bpd,
 		else
 			regmap_write(regmap, bpd[i].bus_prot_clr, mask);
 
+		if (bpd[i].ignore_clr_ack)
+			continue;
+
 		ret = regmap_read_poll_timeout(regmap, bpd[i].bus_prot_sta,
 					       val, !(val & mask),
 					       MTK_POLL_DELAY_US, MTK_POLL_TIMEOUT);
-- 
2.28.0