Re: [PATCH] drm/msm: Initialize MDSS irq domain at probe time
From: Dmitry Baryshkov
Date: Thu Nov 25 2021 - 19:09:39 EST
On 25/11/2021 18:09, AngeloGioacchino Del Regno wrote:
Since commit 8f59ee9a570c ("drm/msm/dsi: Adjust probe order"), the
DSI host gets initialized earlier, but this caused unability to probe
the entire stack of components because they all depend on interrupts
coming from the main `mdss` node (mdp5, or dpu1).
To fix this issue, also anticipate probing mdp5 or dpu1 by initializing
them at msm_pdev_probe() time: this will make sure that we add the
required interrupt controller mapping before dsi and/or other components
try to initialize, finally satisfying the dependency.
While at it, also change the allocation of msm_drm_private to use the
devm variant of kzalloc().
Fixes: 8f59ee9a570c ("drm/msm/dsi: Adjust probe order")
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Another issue (or a pack of issues):
Now the msm_drm_init() is unbalanced with msm_drm_uninit(). Bits of code
(putting the drm dev, removing the IRQ domain, etc) have to be called
now from the msm_pdev_remove() function rather than from the unbind path.
The following changes fix the observed issues here, however additional
care should be taken.
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 5a92417d21d0..0abb16256b61 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -342,7 +342,6 @@ static int msm_drm_uninit(struct device *dev)
struct drm_device *ddev = platform_get_drvdata(pdev);
struct msm_drm_private *priv = ddev->dev_private;
struct msm_kms *kms = priv->kms;
- struct msm_mdss *mdss = priv->mdss;
int i;
/*
@@ -402,14 +401,7 @@ static int msm_drm_uninit(struct device *dev)
component_unbind_all(dev, ddev);
- if (mdss && mdss->funcs)
- mdss->funcs->destroy(ddev);
-
- ddev->dev_private = NULL;
- drm_dev_put(ddev);
-
destroy_workqueue(priv->wq);
- kfree(priv);
return 0;
}
@@ -515,7 +507,6 @@ static int msm_drm_init(struct device *dev, const
struct drm_device *ddev = platform_get_drvdata(pdev);
struct msm_drm_private *priv = ddev->dev_private;
struct msm_kms *kms = priv->kms;
- struct msm_mdss *mdss = priv->mdss;
int ret, i;
priv->wq = alloc_ordered_workqueue("msm", 0);
@@ -538,12 +529,12 @@ static int msm_drm_init(struct device *dev, const
ret = msm_init_vram(ddev);
if (ret)
- goto err_destroy_mdss;
+ return ret;
/* Bind all our sub-components: */
ret = component_bind_all(dev, ddev);
if (ret)
- goto err_destroy_mdss;
+ return ret;
dma_set_max_seg_size(dev, UINT_MAX);
@@ -649,10 +640,6 @@ static int msm_drm_init(struct device *dev, const
err_msm_uninit:
msm_drm_uninit(dev);
return ret;
-err_destroy_mdss:
- if (mdss && mdss->funcs)
- mdss->funcs->destroy(ddev);
- return ret;
}
/*
@@ -1424,9 +1411,20 @@ static int msm_pdev_probe(struct platform_device
static int msm_pdev_remove(struct platform_device *pdev)
{
+ struct drm_device *ddev = platform_get_drvdata(pdev);
+ struct msm_drm_private *priv = ddev->dev_private;
+ struct msm_mdss *mdss = priv->mdss;
+
component_master_del(&pdev->dev, &msm_drm_ops);
+
of_platform_depopulate(&pdev->dev);
+ if (mdss && mdss->funcs)
+ mdss->funcs->destroy(ddev);
+
+ ddev->dev_private = NULL;
+ drm_dev_put(ddev);
+
return 0;
}
---
drivers/gpu/drm/msm/msm_drv.c | 81 ++++++++++++++++-------------------
1 file changed, 38 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index 7936e8d498dd..790acf4993c0 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -512,45 +512,12 @@ static int msm_init_vram(struct drm_device *dev)
static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
{
struct platform_device *pdev = to_platform_device(dev);
- struct drm_device *ddev;
- struct msm_drm_private *priv;
- struct msm_kms *kms;
- struct msm_mdss *mdss;
+ struct drm_device *ddev = platform_get_drvdata(pdev);
+ struct msm_drm_private *priv = ddev->dev_private;
+ struct msm_kms *kms = priv->kms;
+ struct msm_mdss *mdss = priv->mdss;
int ret, i;
- ddev = drm_dev_alloc(drv, dev);
- if (IS_ERR(ddev)) {
- DRM_DEV_ERROR(dev, "failed to allocate drm_device\n");
- return PTR_ERR(ddev);
- }
-
- platform_set_drvdata(pdev, ddev);
-
- priv = kzalloc(sizeof(*priv), GFP_KERNEL);
- if (!priv) {
- ret = -ENOMEM;
- goto err_put_drm_dev;
- }
-
- ddev->dev_private = priv;
- priv->dev = ddev;
-
- switch (get_mdp_ver(pdev)) {
- case KMS_MDP5:
- ret = mdp5_mdss_init(ddev);
- break;
- case KMS_DPU:
- ret = dpu_mdss_init(ddev);
- break;
- default:
- ret = 0;
- break;
- }
- if (ret)
- goto err_free_priv;
-
- mdss = priv->mdss;
-
priv->wq = alloc_ordered_workqueue("msm", 0);
priv->hangcheck_period = DRM_MSM_HANGCHECK_DEFAULT_PERIOD;
@@ -685,11 +652,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
err_destroy_mdss:
if (mdss && mdss->funcs)
mdss->funcs->destroy(ddev);
-err_free_priv:
- kfree(priv);
-err_put_drm_dev:
- drm_dev_put(ddev);
- platform_set_drvdata(pdev, NULL);
return ret;
}
@@ -1382,12 +1344,42 @@ static const struct component_master_ops msm_drm_ops = {
static int msm_pdev_probe(struct platform_device *pdev)
{
struct component_match *match = NULL;
+ struct msm_drm_private *priv;
+ struct drm_device *ddev;
int ret;
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ ddev = drm_dev_alloc(&msm_driver, &pdev->dev);
+ if (IS_ERR(ddev)) {
+ DRM_DEV_ERROR(&pdev->dev, "failed to allocate drm_device\n");
+ return PTR_ERR(ddev);
+ }
+
+ platform_set_drvdata(pdev, ddev);
+ ddev->dev_private = priv;
+ priv->dev = ddev;
+
+ switch (get_mdp_ver(pdev)) {
+ case KMS_MDP5:
+ ret = mdp5_mdss_init(ddev);
+ break;
+ case KMS_DPU:
+ ret = dpu_mdss_init(ddev);
+ break;
+ default:
+ ret = 0;
+ break;
+ }
+ if (ret)
+ goto err_put_drm_dev;
+
if (get_mdp_ver(pdev)) {
ret = add_display_components(pdev, &match);
if (ret)
- return ret;
+ goto fail;
}
ret = add_gpu_components(&pdev->dev, &match);
@@ -1409,6 +1401,9 @@ static int msm_pdev_probe(struct platform_device *pdev)
fail:
of_platform_depopulate(&pdev->dev);
+err_put_drm_dev:
+ drm_dev_put(ddev);
+ platform_set_drvdata(pdev, NULL);
return ret;
}
--
With best wishes
Dmitry