linux-kernel - [PATCH v3] drm/msm: handle for EPROBE_DEFER for of_icc

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Date:   Fri, 10 Jul 2020 19:46:55 -0400
From:   Jonathan Marek <jonathan@...ek.ca>
To:     freedreno@...ts.freedesktop.org
Cc:     Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Brian Masney <masneyb@...tation.org>,
        Shawn Guo <shawn.guo@...aro.org>,
        linux-arm-msm@...r.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU),
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO
        GPU), linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3] drm/msm: handle for EPROBE_DEFER for of_icc_get

Check for errors instead of silently not using icc if the msm driver
probes before the interconnect driver.

Allow ENODATA for ocmem path, as it is optional and this error
is returned when "gfx-mem" path is provided but not "ocmem".

Because msm_gpu_cleanup assumes msm_gpu_init has been called, the icc path
init needs to be after msm_gpu_init for the error path to work.

v2: changed to not only check for EPROBE_DEFER
v3: move icc path init after msm_gpu_init to avoid deleting a WARN_ON

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 65 +++++++++++++++----------
 1 file changed, 38 insertions(+), 27 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 89673c7ed473..8ab75d7691bd 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -895,7 +895,7 @@ static int adreno_get_legacy_pwrlevels(struct device *dev)
 	return 0;
 }
 
-static int adreno_get_pwrlevels(struct device *dev,
+static void adreno_get_pwrlevels(struct device *dev,
 		struct msm_gpu *gpu)
 {
 	unsigned long freq = ULONG_MAX;
@@ -930,24 +930,6 @@ static int adreno_get_pwrlevels(struct device *dev,
 	}
 
 	DBG("fast_rate=%u, slow_rate=27000000", gpu->fast_rate);
-
-	/* Check for an interconnect path for the bus */
-	gpu->icc_path = of_icc_get(dev, "gfx-mem");
-	if (!gpu->icc_path) {
-		/*
-		 * Keep compatbility with device trees that don't have an
-		 * interconnect-names property.
-		 */
-		gpu->icc_path = of_icc_get(dev, NULL);
-	}
-	if (IS_ERR(gpu->icc_path))
-		gpu->icc_path = NULL;
-
-	gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
-	if (IS_ERR(gpu->ocmem_icc_path))
-		gpu->ocmem_icc_path = NULL;
-
-	return 0;
 }
 
 int adreno_gpu_ocmem_init(struct device *dev, struct adreno_gpu *adreno_gpu,
@@ -993,9 +975,11 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		struct adreno_gpu *adreno_gpu,
 		const struct adreno_gpu_funcs *funcs, int nr_rings)
 {
-	struct adreno_platform_config *config = pdev->dev.platform_data;
+	struct device *dev = &pdev->dev;
+	struct adreno_platform_config *config = dev->platform_data;
 	struct msm_gpu_config adreno_gpu_config  = { 0 };
 	struct msm_gpu *gpu = &adreno_gpu->base;
+	int ret;
 
 	adreno_gpu->funcs = funcs;
 	adreno_gpu->info = adreno_info(config->rev);
@@ -1007,15 +991,42 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 
 	adreno_gpu_config.nr_rings = nr_rings;
 
-	adreno_get_pwrlevels(&pdev->dev, gpu);
+	adreno_get_pwrlevels(dev, gpu);
 
-	pm_runtime_set_autosuspend_delay(&pdev->dev,
+	pm_runtime_set_autosuspend_delay(dev,
 		adreno_gpu->info->inactive_period);
-	pm_runtime_use_autosuspend(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
+	pm_runtime_use_autosuspend(dev);
+	pm_runtime_enable(dev);
 
-	return msm_gpu_init(drm, pdev, &adreno_gpu->base, &funcs->base,
+	ret = msm_gpu_init(drm, pdev, &adreno_gpu->base, &funcs->base,
 			adreno_gpu->info->name, &adreno_gpu_config);
+	if (ret)
+		return ret;
+
+	/* Check for an interconnect path for the bus */
+	gpu->icc_path = of_icc_get(dev, "gfx-mem");
+	if (!gpu->icc_path) {
+		/*
+		 * Keep compatbility with device trees that don't have an
+		 * interconnect-names property.
+		 */
+		gpu->icc_path = of_icc_get(dev, NULL);
+	}
+	if (IS_ERR(gpu->icc_path)) {
+		ret = PTR_ERR(gpu->icc_path);
+		gpu->icc_path = NULL;
+		return ret;
+	}
+
+	gpu->ocmem_icc_path = of_icc_get(dev, "ocmem");
+	if (IS_ERR(gpu->ocmem_icc_path)) {
+		ret = PTR_ERR(gpu->ocmem_icc_path);
+		gpu->ocmem_icc_path = NULL;
+		/* allow -ENODATA, ocmem icc is optional */
+		if (ret != -ENODATA)
+			return ret;
+	}
+	return 0;
 }
 
 void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)
@@ -1026,8 +1037,8 @@ void adreno_gpu_cleanup(struct adreno_gpu *adreno_gpu)
 	for (i = 0; i < ARRAY_SIZE(adreno_gpu->info->fw); i++)
 		release_firmware(adreno_gpu->fw[i]);
 
+	msm_gpu_cleanup(&adreno_gpu->base);
+
 	icc_put(gpu->icc_path);
 	icc_put(gpu->ocmem_icc_path);
-
-	msm_gpu_cleanup(&adreno_gpu->base);
 }
-- 
2.26.1