linux-kernel - [PATCH v2] drm/msm: handle for EPROBE_DEFER for of_icc

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Date:   Thu,  9 Jul 2020 10:34:03 -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>,
        Fabio Estevam <festevam@...il.com>,
        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 v2] 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".

Remove the WARN_ON in msm_gpu_cleanup because INIT_LIST_HEAD won't have
been called on the list yet when going through the defer error path.

Changes in v2:
* Changed to not only check for EPROBE_DEFER

Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 17 ++++++++++++++---
 drivers/gpu/drm/msm/msm_gpu.c           |  2 --
 2 files changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 89673c7ed473..0f5217202eb5 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -940,12 +940,20 @@ static int adreno_get_pwrlevels(struct device *dev,
 		 */
 		gpu->icc_path = of_icc_get(dev, NULL);
 	}
-	if (IS_ERR(gpu->icc_path))
+	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))
+	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;
 }
@@ -996,6 +1004,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	struct adreno_platform_config *config = pdev->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);
@@ -1007,7 +1016,9 @@ 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);
+	ret = adreno_get_pwrlevels(&pdev->dev, gpu);
+	if (ret)
+		return ret;
 
 	pm_runtime_set_autosuspend_delay(&pdev->dev,
 		adreno_gpu->info->inactive_period);
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index a22d30622306..ccf9a0dd9706 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -959,8 +959,6 @@ void msm_gpu_cleanup(struct msm_gpu *gpu)
 
 	DBG("%s", gpu->name);
 
-	WARN_ON(!list_empty(&gpu->active_list));
-
 	for (i = 0; i < ARRAY_SIZE(gpu->rb); i++) {
 		msm_ringbuffer_destroy(gpu->rb[i]);
 		gpu->rb[i] = NULL;
-- 
2.26.1