linux-kernel - [PATCH v4] drm/msm/a6xx: request memory region

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Date: Sun, 12 May 2024 05:03:53 -0400
From: Kiarash Hajian <kiarash8112hajian@...il.com>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Kiarash Hajian <kiarash8112hajian@...il.com>
Subject: [PATCH v4] drm/msm/a6xx: request memory region

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@...il.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 | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 8bea8ef26f77..cf0b3b3d8f34 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -524,9 +524,6 @@ static void a6xx_gmu_rpmh_init(struct a6xx_gmu *gmu)
 	uint32_t pdc_address_offset;
 	bool pdc_in_aop = false;
 
-	if (IS_ERR(pdcptr))
-		goto err;
-
 	if (adreno_is_a650(adreno_gpu) ||
 	    adreno_is_a660_family(adreno_gpu) ||
 	    adreno_is_a7xx(adreno_gpu))
@@ -540,8 +537,6 @@ 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;
 	}
 
 	/* Disable SDE clock gating */
@@ -633,12 +628,6 @@ 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 +1492,7 @@ 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 +1602,11 @@ 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;
 	}
 
 	gmu->cxpd = dev_pm_domain_attach_by_name(gmu->dev, "cx");
 	if (IS_ERR(gmu->cxpd)) {
 		ret = PTR_ERR(gmu->cxpd);
-		goto err_mmio;
 	}
 
 	if (!device_link_add(gmu->dev, gmu->cxpd, DL_FLAG_PM_RUNTIME)) {
@@ -1635,7 +1622,6 @@ 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;
 	}
 
 	gmu->initialized = true;
@@ -1645,9 +1631,6 @@ 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);
-
 	/* Drop reference taken in of_find_device_by_node */
 	put_device(gmu->dev);
 
@@ -1825,9 +1808,6 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 	dev_pm_domain_detach(gmu->cxpd, false);
 
 err_mmio:
-	iounmap(gmu->mmio);
-	if (platform_get_resource_byname(pdev, IORESOURCE_MEM, "rscc"))
-		iounmap(gmu->rscc);
 	free_irq(gmu->gmu_irq, gmu);
 	free_irq(gmu->hfi_irq, gmu);
 

---
base-commit: cf87f46fd34d6c19283d9625a7822f20d90b64a4
change-id: 20240511-msm-adreno-memory-region-2bcb1c958621

Best regards,
-- 
Kiarash Hajian <kiarash8112hajian@...il.com>