diff --git a/drivers/gpu/nvgpu/os/linux/module.c b/drivers/gpu/nvgpu/os/linux/module.c
index a81d837bd..ebe2e6505 100644
--- a/drivers/gpu/nvgpu/os/linux/module.c
+++ b/drivers/gpu/nvgpu/os/linux/module.c
@@ -680,6 +680,16 @@ void __iomem *nvgpu_devm_ioremap(struct device *dev, resource_size_t offset,
 	return devm_ioremap(dev, offset, size);
 }
 
+u64 nvgpu_resource_addr(struct platform_device *dev, int i)
+{
+	struct resource *r = platform_get_resource(dev, IORESOURCE_MEM, i);
+
+	if (!r)
+		return 0;
+
+	return r->start;
+}
+
 static irqreturn_t gk20a_intr_isr_stall(int irq, void *dev_id)
 {
 	struct gk20a *g = dev_id;
@@ -764,6 +774,14 @@ static int gk20a_init_support(struct platform_device *pdev)
 		goto fail;
 	}
 
+	l->regs_bus_addr = nvgpu_resource_addr(pdev,
+			GK20A_BAR0_IORESOURCE_MEM);
+	if (!l->regs_bus_addr) {
+		nvgpu_err(g, "failed to read register bus offset");
+		err = -ENODEV;
+		goto fail;
+	}
+
 	l->bar1 = nvgpu_devm_ioremap_resource(pdev,
 					      GK20A_BAR1_IORESOURCE_MEM,
 					      &l->bar1_mem);
diff --git a/drivers/gpu/nvgpu/os/linux/module.h b/drivers/gpu/nvgpu/os/linux/module.h
index da61425d0..76c727481 100644
--- a/drivers/gpu/nvgpu/os/linux/module.h
+++ b/drivers/gpu/nvgpu/os/linux/module.h
@@ -29,6 +29,7 @@ void __iomem *nvgpu_devm_ioremap_resource(struct platform_device *dev, int i,
 		struct resource **out);
 void __iomem *nvgpu_devm_ioremap(struct device *dev, resource_size_t offset,
 		resource_size_t size);
+u64 nvgpu_resource_addr(struct platform_device *dev, int i);
 extern struct class nvgpu_class;
 
 #endif
diff --git a/drivers/gpu/nvgpu/os/linux/os_linux.h b/drivers/gpu/nvgpu/os/linux/os_linux.h
index 5f636f491..d4b5a770c 100644
--- a/drivers/gpu/nvgpu/os/linux/os_linux.h
+++ b/drivers/gpu/nvgpu/os/linux/os_linux.h
@@ -128,6 +128,8 @@ struct nvgpu_os_linux {
 	void __iomem *usermode_regs;
 	void __iomem *usermode_regs_saved;
 
+	u64 regs_bus_addr;
+
 	struct nvgpu_os_linux_ops ops;
 
 #ifdef CONFIG_DEBUG_FS
diff --git a/drivers/gpu/nvgpu/os/linux/pci.c b/drivers/gpu/nvgpu/os/linux/pci.c
index 2e456abc6..61e412f29 100644
--- a/drivers/gpu/nvgpu/os/linux/pci.c
+++ b/drivers/gpu/nvgpu/os/linux/pci.c
@@ -536,6 +536,13 @@ static int nvgpu_pci_init_support(struct pci_dev *pdev)
 		goto fail;
 	}
 
+	l->regs_bus_addr = pci_resource_start(pdev, 0);
+	if (!l->regs_bus_addr) {
+		nvgpu_err(g, "failed to read register bus offset");
+		err = -ENODEV;
+		goto fail;
+	}
+
 	l->bar1 = nvgpu_devm_ioremap(dev, pci_resource_start(pdev, 1),
 				     pci_resource_len(pdev, 1));
 	if (IS_ERR(l->bar1)) {