[PATCH 1/1] drm/msm: request memory region

[Kiarash Hajian <kiarash8112hajian@gmail.com>]

The driver's memory regions are currently just ioremap()ed, but not
reserved through a request. That's not a bug, but having the request is
a little more robust.

Implement the region-request through the corresponding managed
devres-function.

Signed-off-by: Kiarash Hajian <kiarash8112hajian@gmail.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c |  5 +++++
 drivers/gpu/drm/msm/msm_io_utils.c    | 10 ++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 8bea8ef26f77..05102b0eba50 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -1503,6 +1503,11 @@ static void __iomem *a6xx_gmu_get_mmio(struct platform_device *pdev,
 		return ERR_PTR(-EINVAL);
 	}
 
+	if (!devm_request_mem_region(pdev->dev, res->start, resource_size(res), name)) {
+		DRM_DEV_ERROR(&pdev->dev, "Unable to reserve the %s registers\n", name);
+		return ERR_PTR(-EBUSY);
+	}
+
 	ret = ioremap(res->start, resource_size(res));
 	if (!ret) {
 		DRM_DEV_ERROR(&pdev->dev, "Unable to map the %s registers\n", name);
diff --git a/drivers/gpu/drm/msm/msm_io_utils.c b/drivers/gpu/drm/msm/msm_io_utils.c
index afedd61c3e28..16f8ae7a74bb 100644
--- a/drivers/gpu/drm/msm/msm_io_utils.c
+++ b/drivers/gpu/drm/msm/msm_io_utils.c
@@ -59,6 +59,10 @@ void __iomem *msm_ioremap_mdss(struct platform_device *mdss_pdev,
 	res = platform_get_resource_byname(mdss_pdev, IORESOURCE_MEM, name);
 	if (!res)
 		return ERR_PTR(-EINVAL);
+	
+	if (!devm_request_mem_region(pdev->dev, res->start, resource_size(res), name)) {
+		return ERR_PTR(-EBUSY);
+	}
 
 	return devm_ioremap_resource(&pdev->dev, res);
 }
@@ -83,6 +87,12 @@ static void __iomem *_msm_ioremap(struct platform_device *pdev, const char *name
 
 	size = resource_size(res);
 
+	if (!devm_request_mem_region(pdev->dev, res->start, size, name)) {
+		if (!quiet)
+			DRM_DEV_ERROR(&pdev->dev, "failed to reserve memory resource: %s\n", name);
+		return ERR_PTR(-EBUSY);
+	}
+
 	ptr = devm_ioremap(&pdev->dev, res->start, size);
 	if (!ptr) {
 		if (!quiet)
-- 
2.43.0