drm/msm: Allocate msm_drm_private early and pass it as driver data

In preparation for registering the mdss interrupt controller earlier,
move the allocation of msm_drm_private from component bind time to
msm_drv probe; this also allows us to use the devm variant of kzalloc.

Since it is not right to allocate the drm_device at probe time (as
it should exist only when all components are bound, and taken down
when components get cleaned up), the only way to make this happen is
to pass a pointer to msm_drm_private as driver data (like done in
many other DRM drivers), instead of one to drm_device like it's
currently done in this driver.

This is also simplifying some bind/unbind functions around drm/msm,
as some of them are using drm_device just to grab a pointer to the
msm_drm_private structure, which we now retrieve in one call.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20211201105210.24970-2-angelogioacchino.delregno@collabora.com
Signed-off-by: Rob Clark <robdclark@chromium.org>

1 files changed, 19 insertions, 27 deletions

diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
index f81cf7097494..f5596efd3819 100644
--- a/drivers/gpu/drm/msm/msm_drv.c
+++ b/drivers/gpu/drm/msm/msm_drv.c
@@ -339,8 +339,8 @@ static int vblank_ctrl_queue_work(struct msm_drm_private *priv,
 static int msm_drm_uninit(struct device *dev)
 {
 	struct platform_device *pdev = to_platform_device(dev);
-	struct drm_device *ddev = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *ddev = priv->dev;
 	struct msm_kms *kms = priv->kms;
 	struct msm_mdss *mdss = priv->mdss;
 	int i;
@@ -409,7 +409,6 @@ static int msm_drm_uninit(struct device *dev)
 	drm_dev_put(ddev);
 
 	destroy_workqueue(priv->wq);
-	kfree(priv);
 
 	return 0;
 }
@@ -512,8 +511,8 @@ 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 msm_drm_private *priv = dev_get_drvdata(dev);
 	struct drm_device *ddev;
-	struct msm_drm_private *priv;
 	struct msm_kms *kms;
 	struct msm_mdss *mdss;
 	int ret, i;
@@ -523,15 +522,6 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		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;
 
@@ -547,7 +537,7 @@ static int msm_drm_init(struct device *dev, const struct drm_driver *drv)
 		break;
 	}
 	if (ret)
-		goto err_free_priv;
+		goto err_put_drm_dev;
 
 	mdss = priv->mdss;
 
@@ -685,11 +675,8 @@ err_msm_uninit:
 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;
 }
 
@@ -1136,8 +1123,7 @@ static const struct drm_driver msm_driver = {
 
 static int __maybe_unused msm_runtime_suspend(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1150,8 +1136,7 @@ static int __maybe_unused msm_runtime_suspend(struct device *dev)
 
 static int __maybe_unused msm_runtime_resume(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev->dev_private;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
 	struct msm_mdss *mdss = priv->mdss;
 
 	DBG("");
@@ -1181,8 +1166,8 @@ static int __maybe_unused msm_pm_resume(struct device *dev)
 
 static int __maybe_unused msm_pm_prepare(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return 0;
@@ -1192,8 +1177,8 @@ static int __maybe_unused msm_pm_prepare(struct device *dev)
 
 static void __maybe_unused msm_pm_complete(struct device *dev)
 {
-	struct drm_device *ddev = dev_get_drvdata(dev);
-	struct msm_drm_private *priv = ddev ? ddev->dev_private : NULL;
+	struct msm_drm_private *priv = dev_get_drvdata(dev);
+	struct drm_device *ddev = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;
@@ -1392,8 +1377,15 @@ 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;
 	int ret;
 
+	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, priv);
+
 	if (get_mdp_ver(pdev)) {
 		ret = add_display_components(pdev, &match);
 		if (ret)
@@ -1432,8 +1424,8 @@ static int msm_pdev_remove(struct platform_device *pdev)
 
 static void msm_pdev_shutdown(struct platform_device *pdev)
 {
-	struct drm_device *drm = platform_get_drvdata(pdev);
-	struct msm_drm_private *priv = drm ? drm->dev_private : NULL;
+	struct msm_drm_private *priv = platform_get_drvdata(pdev);
+	struct drm_device *drm = priv ? priv->dev : NULL;
 
 	if (!priv || !priv->kms)
 		return;