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From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
To:     robh+dt@kernel.org, mark.rutland@arm.com, ck.hu@mediatek.com,
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Cc:     Mauro Carvalho Chehab <mchehab@kernel.org>, rdunlap@infradead.org,
        dri-devel@lists.freedesktop.org, Weiyi Lu <weiyi.lu@mediatek.com>,
        Seiya Wang <seiya.wang@mediatek.com>,
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        Collabora Kernel ML <kernel@collabora.com>,
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        Houlong Wei <houlong.wei@mediatek.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        linux-media@vger.kernel.org, devicetree@vger.kernel.org,
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        Minghsiu Tsai <minghsiu.tsai@mediatek.com>,
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        Daniel Vetter <daniel@ffwll.ch>
Subject: [PATCH v10 5/5] soc / drm: mediatek: Fix mediatek-drm device probing
Date:   Thu, 27 Feb 2020 19:08:58 +0100
Message-Id: <20200227180858.1514157-6-enric.balletbo@collabora.com>
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In the actual implementation the same compatible string
"mediatek,<chip>-mmsys" is used to bind the clock drivers
(drivers/soc/mediatek) as well as to the gpu driver
(drivers/gpu/drm/mediatek/mtk_drm_drv.c). This ends with the problem
that the only probed driver is the clock driver and there is no display
at all.

In any case having the same compatible string for two drivers is not
correct and should be fixed. To fix this, and maintain backward
compatibility, we can consider that the mmsys driver is the top-level
entry point for the multimedia subsystem, so is not a pure clock
controller but a system controller, and the drm driver is instantiated
by that MMSYS driver.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

Changes in v10:
- Match driver data to get display routing.

Changes in v9:
- Do not move the display routing from the drm driver (CK)

Changes in v8:
- New patch introduced in this series.

Changes in v7: None

 drivers/gpu/drm/mediatek/mtk_drm_drv.c | 31 ++++++++++++++++----------
 drivers/soc/mediatek/mtk-mmsys.c       |  6 +++++
 2 files changed, 25 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 02011d3168df..29252fc0aab7 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -422,9 +422,21 @@ static const struct of_device_id mtk_ddp_comp_dt_ids[] = {
 	{ }
 };
 
+static const struct of_device_id mtk_drm_of_ids[] = {
+	{ .compatible = "mediatek,mt2701-mmsys",
+	  .data = &mt2701_mmsys_driver_data},
+	{ .compatible = "mediatek,mt2712-mmsys",
+	  .data = &mt2712_mmsys_driver_data},
+	{ .compatible = "mediatek,mt8173-mmsys",
+	  .data = &mt8173_mmsys_driver_data},
+	{ }
+};
+
 static int mtk_drm_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *phandle = dev->parent->of_node;
+	const struct of_device_id *of_id;
 	struct mtk_drm_private *private;
 	struct device_node *node;
 	struct component_match *match = NULL;
@@ -443,8 +455,14 @@ static int mtk_drm_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
+	of_id = of_match_node(mtk_drm_of_ids, phandle);
+	if (!of_id)
+		return -ENODEV;
+
+	private->data = of_id->data;
+
 	/* Iterate over sibling DISP function blocks */
-	for_each_child_of_node(dev->of_node->parent, node) {
+	for_each_child_of_node(phandle->parent, node) {
 		const struct of_device_id *of_id;
 		enum mtk_ddp_comp_type comp_type;
 		int comp_id;
@@ -576,22 +594,11 @@ static int mtk_drm_sys_resume(struct device *dev)
 static SIMPLE_DEV_PM_OPS(mtk_drm_pm_ops, mtk_drm_sys_suspend,
 			 mtk_drm_sys_resume);
 
-static const struct of_device_id mtk_drm_of_ids[] = {
-	{ .compatible = "mediatek,mt2701-mmsys",
-	  .data = &mt2701_mmsys_driver_data},
-	{ .compatible = "mediatek,mt2712-mmsys",
-	  .data = &mt2712_mmsys_driver_data},
-	{ .compatible = "mediatek,mt8173-mmsys",
-	  .data = &mt8173_mmsys_driver_data},
-	{ }
-};
-
 static struct platform_driver mtk_drm_platform_driver = {
 	.probe	= mtk_drm_probe,
 	.remove	= mtk_drm_remove,
 	.driver	= {
 		.name	= "mediatek-drm",
-		.of_match_table = mtk_drm_of_ids,
 		.pm     = &mtk_drm_pm_ops,
 	},
 };
diff --git a/drivers/soc/mediatek/mtk-mmsys.c b/drivers/soc/mediatek/mtk-mmsys.c
index a8a98777064e..d99c8beb2ed2 100644
--- a/drivers/soc/mediatek/mtk-mmsys.c
+++ b/drivers/soc/mediatek/mtk-mmsys.c
@@ -377,6 +377,7 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 	const struct mtk_mmsys_driver_data *data;
 	struct clk_onecell_data *clk_data;
 	struct device *dev = &pdev->dev;
+	struct platform_device *drm;
 	void __iomem *config_regs;
 	struct resource *mem;
 	int ret;
@@ -407,6 +408,11 @@ static int mtk_mmsys_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	drm = platform_device_register_data(&pdev->dev, "mediatek-drm",
+					    PLATFORM_DEVID_NONE, NULL, 0);
+	if (IS_ERR(drm))
+		return PTR_ERR(drm);
+
 	return 0;
 }
 
-- 
2.25.0