[PATCH mt76 3/6] wifi: mt76: mt7996: update WFSYS reset flow for MT7990 chipsets

[Shayne Chen]

From: Peter Chiu <chui-hao.chiu at mediatek.com>

Skip WFSYS reset during bootup for MT7990 chipsets; only reset if L0.5
recovery is triggered.
Without this fix, the following kernel error may occur:
Internal error: synchronous external abort.

Signed-off-by: Peter Chiu <chui-hao.chiu at mediatek.com>
Signed-off-by: Shayne Chen <shayne.chen at mediatek.com>
---
 .../net/wireless/mediatek/mt76/mt7996/init.c  | 29 +++++++++++++++++--
 .../net/wireless/mediatek/mt76/mt7996/regs.h  |  8 +++++
 2 files changed, 34 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/init.c b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
index f3239f530aea..8dfb81eabc9a 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/init.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/init.c
@@ -791,11 +791,34 @@ static void mt7996_init_work(struct work_struct *work)
 
 void mt7996_wfsys_reset(struct mt7996_dev *dev)
 {
-	mt76_set(dev, MT_WF_SUBSYS_RST, 0x1);
-	msleep(20);
+	if (!is_mt7990(&dev->mt76)) {
+		mt76_set(dev, MT_WF_SUBSYS_RST, 0x1);
+		msleep(20);
+
+		mt76_clear(dev, MT_WF_SUBSYS_RST, 0x1);
+		msleep(20);
+
+		return;
+	}
 
-	mt76_clear(dev, MT_WF_SUBSYS_RST, 0x1);
+	if (!dev->recovery.hw_full_reset)
+		return;
+
+	mt76_set(dev, MT_WF_SUBSYS_RST,
+		 MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT |
+		 MT_WF_SUBSYS_RST_BYPASS_WFDMA_SLP_PROT |
+		 MT_WF_SUBSYS_RST_BYPASS_WFDMA2_SLP_PROT);
+	mt76_rmw(dev, MT_WF_SUBSYS_RST,
+		 MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE,
+		 u32_encode_bits(0x20, MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE));
+	mt76_clear(dev, MT_WF_L05_RST, MT_WF_L05_RST_WF_RST_MASK);
+	mt76_set(dev, MT_WF_SUBSYS_RST, MT_WF_SUBSYS_RST_WHOLE_PATH_RST);
 	msleep(20);
+
+	if (mt76_poll(dev, MT_WF_L05_RST, MT_WF_L05_RST_WF_RST_MASK, 0x1a, 1000))
+		return;
+
+	dev_err(dev->mt76.dev, "wfsys reset fail\n");
 }
 
 static void mt7996_rro_hw_init_v3(struct mt7996_dev *dev)
diff --git a/drivers/net/wireless/mediatek/mt76/mt7996/regs.h b/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
index 393faae2d52b..c6379933b6c3 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7996/regs.h
@@ -736,7 +736,15 @@ enum offs_rev {
 #define MT_HW_REV				0x70010204
 #define MT_HW_REV1				0x8a00
 
+#define MT_WF_L05_RST				0x70028550
+#define MT_WF_L05_RST_WF_RST_MASK		GENMASK(4, 0)
+
 #define MT_WF_SUBSYS_RST			0x70028600
+#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST		BIT(0)
+#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT	BIT(5)
+#define MT_WF_SUBSYS_RST_BYPASS_WFDMA_SLP_PROT	BIT(6)
+#define MT_WF_SUBSYS_RST_BYPASS_WFDMA2_SLP_PROT	BIT(16)
+#define MT_WF_SUBSYS_RST_WHOLE_PATH_RST_REVERT_CYCLE	GENMASK(15, 8)
 
 /* PCIE MAC */
 #define MT_PCIE_MAC_BASE			0x74030000
-- 
2.51.0