linux-kernel - [PATCH v6 31/35] drm/sprd: Migrate to aggregate driver

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Date:   Thu, 27 Jan 2022 12:01:37 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Douglas Anderson <dianders@...omium.org>
Cc:     linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Kevin Tang <kevin3.tang@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Russell King <rmk+kernel@....linux.org.uk>,
        Saravana Kannan <saravanak@...gle.com>
Subject: [PATCH v6 31/35] drm/sprd: Migrate to aggregate driver

Use an aggregate driver instead of component ops so that we can get
proper driver probe ordering of the aggregate device with respect to all
the component devices that make up the aggregate device.

Cc: Orson Zhai <orsonzhai@...il.com>
Cc: Baolin Wang <baolin.wang7@...il.com>
Cc: Chunyan Zhang <zhang.lyra@...il.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Kevin Tang <kevin3.tang@...il.com>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Rob Clark <robdclark@...il.com>
Cc: Russell King <rmk+kernel@....linux.org.uk>
Cc: Saravana Kannan <saravanak@...gle.com>
Signed-off-by: Stephen Boyd <swboyd@...omium.org>
---
 drivers/gpu/drm/sprd/sprd_drm.c | 48 +++++++++++++++++++--------------
 1 file changed, 28 insertions(+), 20 deletions(-)

diff --git a/drivers/gpu/drm/sprd/sprd_drm.c b/drivers/gpu/drm/sprd/sprd_drm.c
index a077e2d4d721..ff39b32b20c0 100644
--- a/drivers/gpu/drm/sprd/sprd_drm.c
+++ b/drivers/gpu/drm/sprd/sprd_drm.c
@@ -65,8 +65,9 @@ static struct drm_driver sprd_drm_drv = {
 	.minor			= DRIVER_MINOR,
 };
 
-static int sprd_drm_bind(struct device *dev)
+static int sprd_drm_aggregate_probe(struct aggregate_device *adev)
 {
+	struct device *dev = aggregate_device_parent(adev);
 	struct platform_device *pdev = to_platform_device(dev);
 	struct drm_device *drm;
 	struct sprd_drm *sprd;
@@ -118,8 +119,9 @@ static int sprd_drm_bind(struct device *dev)
 	return ret;
 }
 
-static void sprd_drm_unbind(struct device *dev)
+static void sprd_drm_aggregate_remove(struct aggregate_device *adev)
 {
+	struct device *dev = aggregate_device_parent(adev);
 	struct drm_device *drm = dev_get_drvdata(dev);
 
 	drm_dev_unregister(drm);
@@ -129,9 +131,28 @@ static void sprd_drm_unbind(struct device *dev)
 	component_unbind_all(drm->dev, drm);
 }
 
-static const struct component_master_ops drm_component_ops = {
-	.bind = sprd_drm_bind,
-	.unbind = sprd_drm_unbind,
+static void sprd_drm_aggregate_shutdown(struct aggregate_device *adev)
+{
+	struct device *dev = aggregate_device_parent(adev);
+	struct platform_device *pdev = to_platform_device(dev);
+	struct drm_device *drm = platform_get_drvdata(pdev);
+
+	if (!drm) {
+		drm_warn(drm, "drm device is not available, no shutdown\n");
+		return;
+	}
+
+	drm_atomic_helper_shutdown(drm);
+}
+
+static struct aggregate_driver sprd_drm_aggregate_driver = {
+	.probe = sprd_drm_aggregate_probe,
+	.remove = sprd_drm_aggregate_remove,
+	.shutdown = sprd_drm_aggregate_shutdown,
+	.driver = {
+		.name = "sprd_drm",
+		.owner = THIS_MODULE,
+	},
 };
 
 static int compare_of(struct device *dev, void *data)
@@ -141,27 +162,15 @@ static int compare_of(struct device *dev, void *data)
 
 static int sprd_drm_probe(struct platform_device *pdev)
 {
-	return drm_of_component_probe(&pdev->dev, compare_of, &drm_component_ops);
+	return drm_of_aggregate_probe(&pdev->dev, compare_of, &sprd_drm_aggregate_driver);
 }
 
 static int sprd_drm_remove(struct platform_device *pdev)
 {
-	component_master_del(&pdev->dev, &drm_component_ops);
+	component_aggregate_unregister(&pdev->dev, &sprd_drm_aggregate_driver);
 	return 0;
 }
 
-static void sprd_drm_shutdown(struct platform_device *pdev)
-{
-	struct drm_device *drm = platform_get_drvdata(pdev);
-
-	if (!drm) {
-		drm_warn(drm, "drm device is not available, no shutdown\n");
-		return;
-	}
-
-	drm_atomic_helper_shutdown(drm);
-}
-
 static const struct of_device_id drm_match_table[] = {
 	{ .compatible = "sprd,display-subsystem", },
 	{ /* sentinel */ },
@@ -171,7 +180,6 @@ MODULE_DEVICE_TABLE(of, drm_match_table);
 static struct platform_driver sprd_drm_driver = {
 	.probe = sprd_drm_probe,
 	.remove = sprd_drm_remove,
-	.shutdown = sprd_drm_shutdown,
 	.driver = {
 		.name = "sprd-drm-drv",
 		.of_match_table = drm_match_table,
-- 
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