recipes-wifi/linux-mt76/files/patches/0006-wifi-mt76-mt7915-rework-mmio-access-flow.patch

From 441383b3fc8140bdff89d50861fd753b56154cba Mon Sep 17 00:00:00 2001
From: Shayne Chen <shayne.chen@mediatek.com>
Date: Tue, 15 Aug 2023 17:28:30 +0800
Subject: [PATCH 6/7] wifi: mt76: mt7915: rework mmio access flow

Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Peter Chiu <chui-hao.chiu@mediatek.com>
---
 mt7915/mmio.c   | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
 mt7915/mt7915.h |  1 +
 2 files changed, 45 insertions(+), 5 deletions(-)

diff --git a/mt7915/mmio.c b/mt7915/mmio.c
index fc7ace6..5509661 100644
--- a/mt7915/mmio.c
+++ b/mt7915/mmio.c
@@ -490,6 +490,11 @@ static u32 __mt7915_reg_addr(struct mt7915_dev *dev, u32 addr)
 		return dev->reg.map[i].maps + ofs;
 	}
 
+	return 0;
+}
+
+static u32 __mt7915_reg_remap_addr(struct mt7915_dev *dev, u32 addr)
+{
 	if ((addr >= MT_INFRA_BASE && addr < MT_WFSYS0_PHY_START) ||
 	    (addr >= MT_WFSYS0_PHY_START && addr < MT_WFSYS1_PHY_START) ||
 	    (addr >= MT_WFSYS1_PHY_START && addr <= MT_WFSYS1_PHY_END))
@@ -513,32 +518,65 @@ void mt7915_memcpy_fromio(struct mt7915_dev *dev, void *buf, u32 offset,
 			  size_t len)
 {
 	u32 addr = __mt7915_reg_addr(dev, offset);
+	unsigned long flags;
 
-	memcpy_fromio(buf, dev->mt76.mmio.regs + addr, len);
+	if (addr) {
+		memcpy_fromio(buf, dev->mt76.mmio.regs + addr, len);
+		return;
+	}
+
+	spin_lock_irqsave(&dev->reg_lock, flags);
+	memcpy_fromio(buf, dev->mt76.mmio.regs +
+			   __mt7915_reg_remap_addr(dev, offset), len);
+	spin_unlock_irqrestore(&dev->reg_lock, flags);
 }
 
 static u32 mt7915_rr(struct mt76_dev *mdev, u32 offset)
 {
 	struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
-	u32 addr = __mt7915_reg_addr(dev, offset);
+	u32 addr = __mt7915_reg_addr(dev, offset), val;
+	unsigned long flags;
 
-	return dev->bus_ops->rr(mdev, addr);
+	if (addr)
+		return dev->bus_ops->rr(mdev, addr);
+
+	spin_lock_irqsave(&dev->reg_lock, flags);
+	val = dev->bus_ops->rr(mdev, __mt7915_reg_remap_addr(dev, offset));
+	spin_unlock_irqrestore(&dev->reg_lock, flags);
+
+	return val;
 }
 
 static void mt7915_wr(struct mt76_dev *mdev, u32 offset, u32 val)
 {
 	struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
 	u32 addr = __mt7915_reg_addr(dev, offset);
+	unsigned long flags;
 
-	dev->bus_ops->wr(mdev, addr, val);
+	if (addr) {
+		dev->bus_ops->wr(mdev, addr, val);
+		return;
+	}
+
+	spin_lock_irqsave(&dev->reg_lock, flags);
+	dev->bus_ops->wr(mdev, __mt7915_reg_remap_addr(dev, offset), val);
+	spin_unlock_irqrestore(&dev->reg_lock, flags);
 }
 
 static u32 mt7915_rmw(struct mt76_dev *mdev, u32 offset, u32 mask, u32 val)
 {
 	struct mt7915_dev *dev = container_of(mdev, struct mt7915_dev, mt76);
 	u32 addr = __mt7915_reg_addr(dev, offset);
+	unsigned long flags;
+
+	if (addr)
+		return dev->bus_ops->rmw(mdev, addr, mask, val);
+
+	spin_lock_irqsave(&dev->reg_lock, flags);
+	val = dev->bus_ops->rmw(mdev, __mt7915_reg_remap_addr(dev, offset), mask, val);
+	spin_unlock_irqrestore(&dev->reg_lock, flags);
 
-	return dev->bus_ops->rmw(mdev, addr, mask, val);
+	return val;
 }
 
 #ifdef CONFIG_NET_MEDIATEK_SOC_WED
@@ -813,6 +851,7 @@ static int mt7915_mmio_init(struct mt76_dev *mdev,
 
 	dev = container_of(mdev, struct mt7915_dev, mt76);
 	mt76_mmio_init(&dev->mt76, mem_base);
+	spin_lock_init(&dev->reg_lock);
 
 	switch (device_id) {
 	case 0x7915:
diff --git a/mt7915/mt7915.h b/mt7915/mt7915.h
index 4293385..35458ec 100644
--- a/mt7915/mt7915.h
+++ b/mt7915/mt7915.h
@@ -292,6 +292,7 @@ struct mt7915_dev {
 
 	struct list_head sta_rc_list;
 	struct list_head twt_list;
+	spinlock_t reg_lock;
 
 	u32 hw_pattern;
 
-- 
2.18.0