diff --git a/fthd_drv.c b/fthd_drv.c
index 7e81521..8e1397f 100644
--- a/fthd_drv.c
+++ b/fthd_drv.c
@@ -241,7 +241,7 @@ static void fthd_irq_work(struct work_struct *work)
 
 	while(i++ < 500) {
 		spin_lock_irq(&dev_priv->io_lock);
-		pending = FTHD_ISP_REG_READ(ISP_REG_41000);
+		pending = FTHD_ISP_REG_READ(ISP_IRQ_STATUS);
 		spin_unlock_irq(&dev_priv->io_lock);
 
 		if (!(pending & 0xf0))
@@ -249,7 +249,7 @@ static void fthd_irq_work(struct work_struct *work)
 
 		pci_write_config_dword(dev_priv->pdev, 0x94, 0);
 		spin_lock_irq(&dev_priv->io_lock);
-		FTHD_ISP_REG_WRITE(pending, ISP_REG_41024);
+		FTHD_ISP_REG_WRITE(pending, ISP_IRQ_CLEAR);
 		spin_unlock_irq(&dev_priv->io_lock);
 		pci_write_config_dword(dev_priv->pdev, 0x90, 0x200);
 
@@ -278,7 +278,7 @@ static irqreturn_t fthd_irq_handler(int irq, void *arg)
 	unsigned long flags;
 
 	spin_lock_irqsave(&dev_priv->io_lock, flags);
-	pending = FTHD_ISP_REG_READ(ISP_REG_41000);
+	pending = FTHD_ISP_REG_READ(ISP_IRQ_STATUS);
 	spin_unlock_irqrestore(&dev_priv->io_lock, flags);
 
 	if (!(pending & 0xf0))
diff --git a/fthd_hw.c b/fthd_hw.c
index 98ac3ed..ea69fcb 100644
--- a/fthd_hw.c
+++ b/fthd_hw.c
@@ -642,7 +642,7 @@ void fthd_ddr_phy_restore_regs(struct fthd_private *dev_priv)
 
 static int fthd_hw_irq_enable(struct fthd_private *dev_priv)
 {
-	FTHD_ISP_REG_WRITE(0xf8, ISP_REG_41004);
+	FTHD_ISP_REG_WRITE(0xf8, ISP_IRQ_ENABLE);
 	pci_write_config_dword(dev_priv->pdev, 0x94, 0x200);
 
 	return 0;
@@ -650,7 +650,7 @@ static int fthd_hw_irq_enable(struct fthd_private *dev_priv)
 
 static int fthd_hw_irq_disable(struct fthd_private *dev_priv)
 {
-	FTHD_ISP_REG_WRITE(0, ISP_REG_41004);
+	FTHD_ISP_REG_WRITE(0, ISP_IRQ_ENABLE);
 	pci_write_config_dword(dev_priv->pdev, 0x94, 0x0);
 	return 0;
 }
diff --git a/fthd_isp.c b/fthd_isp.c
index 3a4c732..11cd981 100644
--- a/fthd_isp.c
+++ b/fthd_isp.c
@@ -474,7 +474,7 @@ int isp_powerdown(struct fthd_private *dev_priv)
 int isp_uninit(struct fthd_private *dev_priv)
 {
 	FTHD_ISP_REG_WRITE(0x00000000, 0x40004);
-	FTHD_ISP_REG_WRITE(0x00000000, 0x41004);
+	FTHD_ISP_REG_WRITE(0x00000000, ISP_IRQ_ENABLE);
 	FTHD_ISP_REG_WRITE(0xffffffff, 0xc0008);
 	FTHD_ISP_REG_WRITE(0xffffffff, 0xc000c);
 	FTHD_ISP_REG_WRITE(0xffffffff, 0xc0010);
@@ -496,7 +496,7 @@ int isp_uninit(struct fthd_private *dev_priv)
 	FTHD_ISP_REG_WRITE(0, 0xc0020);
 	FTHD_ISP_REG_WRITE(0, 0xc0024);
 
-	FTHD_ISP_REG_WRITE(0xffffffff, 0x41024);
+	FTHD_ISP_REG_WRITE(0xffffffff, ISP_IRQ_CLEAR);
 	isp_free_channel_info(dev_priv);
 	isp_free_set_file(dev_priv);
 	isp_mem_destroy(dev_priv->firmware);
@@ -1288,7 +1288,7 @@ int isp_init(struct fthd_private *dev_priv)
 	FTHD_ISP_REG_WRITE(0, ISP_REG_C3018);
 	FTHD_ISP_REG_WRITE(0, ISP_REG_C301C);
 
-	FTHD_ISP_REG_WRITE(0xffffffff, ISP_REG_41024);
+	FTHD_ISP_REG_WRITE(0xffffffff, ISP_IRQ_CLEAR);
 
 	/*
 	 * Probably the IPC queue
@@ -1303,7 +1303,7 @@ int isp_init(struct fthd_private *dev_priv)
 	FTHD_ISP_REG_WRITE(0x1, ISP_REG_40004);
 
 	for (retries = 0; retries < 1000; retries++) {
-		reg = FTHD_ISP_REG_READ(ISP_REG_41000);
+		reg = FTHD_ISP_REG_READ(ISP_IRQ_STATUS);
 		if ((reg & 0xf0) > 0)
 			break;
 		mdelay(10);
@@ -1317,7 +1317,7 @@ int isp_init(struct fthd_private *dev_priv)
 	dev_info(&dev_priv->pdev->dev, "ISP woke up after %dms\n",
 		 (retries - 1) * 10);
 
-	FTHD_ISP_REG_WRITE(0xffffffff, ISP_REG_41024);
+	FTHD_ISP_REG_WRITE(0xffffffff, ISP_IRQ_CLEAR);
 
 	num_channels = FTHD_ISP_REG_READ(ISP_IPC_NUM_CHAN);
 	queue_size = FTHD_ISP_REG_READ(ISP_IPC_QUEUE_SIZE) + 1;
@@ -1394,7 +1394,7 @@ int isp_init(struct fthd_private *dev_priv)
 		FTHD_ISP_REG_WRITE(0x10, ISP_REG_41020);
 
 		for (retries = 0; retries < 1000; retries++) {
-			reg = FTHD_ISP_REG_READ(ISP_REG_41000);
+			reg = FTHD_ISP_REG_READ(ISP_IRQ_STATUS);
 			if ((reg & 0xf0) > 0)
 				break;
 			mdelay(10);
diff --git a/fthd_reg.h b/fthd_reg.h
index b81b85e..33c10fc 100644
--- a/fthd_reg.h
+++ b/fthd_reg.h
@@ -183,10 +183,10 @@ static const u32 fthd_ddr_phy_reg_map[] = {
 #define ISP_REG_C301C		0xc301c
 #define ISP_REG_40004		0x40004
 #define ISP_REG_40008		0x40008
-#define ISP_REG_41000		0x41000
-#define ISP_REG_41004		0x41004
+#define ISP_IRQ_STATUS		0x41000
+#define ISP_IRQ_ENABLE		0x41004
 #define ISP_REG_41020		0x41020
-#define ISP_REG_41024		0x41024
+#define ISP_IRQ_CLEAR		0x41024
 
 #define ISP_IPC_CHAN_START	0x0128
 #define ISP_IPC_CHAN_END	0x0220