soc: mediatek: pm-domains: Allow bus protection to ignore clear ack

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@suse.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Link: https://lore.kernel.org/r/20201030113622.201188-10-enric.balletbo@collabora.comSigned-off-by: Matthias Brugger <matthias.bgg@gmail.com>

drivers/soc/mediatek/mtk-pm-domains.c

@@ -161,6 +161,9 @@ 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);

drivers/soc/mediatek/mtk-pm-domains.h

@@ -35,19 +35,23 @@
 
 #define SPM_MAX_BUS_PROT_DATA		5
 
-#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)
 
 #define BUS_PROT_UPDATE_TOPAXI(_mask)				\
 		BUS_PROT_UPDATE(_mask,				\
@@ -61,6 +65,7 @@ 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