[PATCH] drm/msm/a6xx: request memory region

[Kiarash Hajian]

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 at gmail.com>
---
Changes in v6:
    -Fix compile error
    -Link to v5: https://lore.kernel.org/all/20240607-memory-v1-1-8664f52fc2a1@gmail.com

Changes in v5:
    - Fix error hanlding problems.
    - Link to v4: https://lore.kernel.org/r/20240512-msm-adreno-memory-region-v4-1-3881a64088e6@gmail.com
    
Changes in v4:
    - Combine v3 commits into a singel commit
    - Link to v3: https://lore.kernel.org/r/20240512-msm-adreno-memory-region-v3-0-0a728ad45010@gmail.com
    
Changes in v3:
    - Remove redundant devm_iounmap calls, relying on devres for automatic resource cleanup.
    
Changes in v2:
    - update the subject prefix to "drm/msm/a6xx:", to match the majority of other changes to this file.
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 33 +++++++++++----------------------
 1 file changed, 11 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 8bea8ef26f77..d26cc6254ef9 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -525,7 +525,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
 	bool pdc_in_aop = false;
 
 	if (IS_ERR(pdcptr))
-		goto err;
+		return;
 
 	if (adreno_is_a650(adreno_gpu) ||
 	    adreno_is_a660_family(adreno_gpu) ||
@@ -541,7 +541,7 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
 	if (!pdc_in_aop) {
 		seqptr = a6xx_gmu_get_mmio(pdev, "gmu_pdc_seq");
 		if (IS_ERR(seqptr))
-			goto err;
+			return;
 	}
 
 	/* Disable SDE clock gating */
@@ -633,12 +633,6 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
 	wmb();
 
 	a6xx_rpmh_stop(gmu);
-
-err:
-	if (!IS_ERR_OR_NULL(pdcptr))
-		iounmap(pdcptr);
-	if (!IS_ERR_OR_NULL(seqptr))
-		iounmap(seqptr);
 }
 
 /*
@@ -1503,7 +1497,7 @@ static void __iomem *a6xx_gmu_get_mmio(struct platform_device *pdev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	ret = ioremap(res->start, resource_size(res));
+	ret = devm_ioremap_resource(&pdev->dev, res);
 	if (!ret) {
 		DRM_DEV_ERROR(&pdev->dev, "Unable to map the %s registers\n", name);
 		return ERR_PTR(-EINVAL);
@@ -1613,13 +1607,13 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 	gmu->mmio = a6xx_gmu_get_mmio(pdev, "gmu");
 	if (IS_ERR(gmu->mmio)) {
 		ret = PTR_ERR(gmu->mmio);
-		goto err_mmio;
+		goto err_cleanup;
 	}
 
 	gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
 	if (IS_ERR(gmu->cxpd)) {
 		ret = PTR_ERR(gmu->cxpd);
-		goto err_mmio;
+		goto err_cleanup;
 	}
 
 	if (!device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME)) {
@@ -1635,7 +1629,7 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 	gmu->gxpd = dev_pm_domain_attach_by_name(gmu->dev, "gx");
 	if (IS_ERR(gmu->gxpd)) {
 		ret = PTR_ERR(gmu->gxpd);
-		goto err_mmio;
+		goto err_cleanup;
 	}
 
 	gmu->initialized = true;
@@ -1645,9 +1639,7 @@ int a6xx_gmu_wrapper_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 detach_cxpd:
 	dev_pm_domain_detach(gmu->cxpd, false);
 
-err_mmio:
-	iounmap(gmu->mmio);
-
+err_cleanup:
 	/* Drop reference taken in of_find_device_by_node */
 	put_device(gmu->dev);
 
@@ -1762,7 +1754,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 		gmu->rscc = a6xx_gmu_get_mmio(pdev, "rscc");
 		if (IS_ERR(gmu->rscc)) {
 			ret = -ENODEV;
-			goto err_mmio;
+			goto err_cleanup;
 		}
 	} else {
 		gmu->rscc = gmu->mmio + 0x23000;
@@ -1774,13 +1766,13 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 
 	if (gmu->hfi_irq < 0 || gmu->gmu_irq < 0) {
 		ret = -ENODEV;
-		goto err_mmio;
+		goto err_cleanup;
 	}
 
 	gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
 	if (IS_ERR(gmu->cxpd)) {
 		ret = PTR_ERR(gmu->cxpd);
-		goto err_mmio;
+		goto err_cleanup;
 	}
 
 	link = device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME);
@@ -1824,10 +1816,7 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 detach_cxpd:
 	dev_pm_domain_detach(gmu->cxpd, false);
 
-err_mmio:
-	iounmap(gmu->mmio);
-	if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "rscc"))
-		iounmap(gmu->rscc);
+err_cleanup:
 	free_irq(gmu->gmu_irq, gmu);
 	free_irq(gmu->hfi_irq, gmu);
 

---
base-commit: 1b294a1f35616977caddaddf3e9d28e576a1adbc
change-id: 20240608-adreno-98c412bfdc03

Best regards,
-- 
Kiarash Hajian <kiarash8112hajian at gmail.com>