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From:   Hsiao Chien Sung <shawn.sung@mediatek.com>
To:     AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@collabora.com>,
        "CK Hu" <ck.hu@mediatek.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        Rob Herring <robh+dt@kernel.org>
CC:     Conor Dooley <conor+dt@kernel.org>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Chun-Kuang Hu <chunkuang.hu@kernel.org>,
        "Mauro Carvalho Chehab" <mchehab@kernel.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <dri-devel@lists.freedesktop.org>,
        <linux-mediatek@lists.infradead.org>,
        <linux-arm-kernel@lists.infradead.org>,
        Singo Chang <singo.chang@mediatek.com>,
        "Nancy . Lin" <nancy.lin@mediatek.com>,
        "Jason-JH . Lin" <jason-jh.lin@mediatek.com>,
        "Hsiao Chien Sung" <shawn.sung@mediatek.com>
Subject: [PATCH v7 15/23] drm/mediatek: Manage component's clock with function pointers
Date:   Fri, 6 Oct 2023 15:38:23 +0800
Message-ID: <20231006073831.10402-16-shawn.sung@mediatek.com>
In-Reply-To: <20231006073831.10402-1-shawn.sung@mediatek.com>
References: <20231006073831.10402-1-shawn.sung@mediatek.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

By registering component related functions to the pointers,
we can easily manage them within a for-loop and simplify the
logic of clock control significantly.

Reviewed-by: CK Hu <ck.hu@mediatek.com>
Signed-off-by: Hsiao Chien Sung <shawn.sung@mediatek.com>
---
 .../gpu/drm/mediatek/mtk_disp_ovl_adaptor.c   | 111 +++++++-----------
 1 file changed, 44 insertions(+), 67 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
index 8a52d1301e04..84133303a6ec 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
+++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl_adaptor.c
@@ -54,6 +54,7 @@ struct ovl_adaptor_comp_match {
 	enum mtk_ovl_adaptor_comp_type type;
 	enum mtk_ddp_comp_id comp_id;
 	int alias_id;
+	const struct mtk_ddp_comp_funcs *funcs;
 };
 
 struct mtk_disp_ovl_adaptor {
@@ -68,20 +69,35 @@ static const char * const private_comp_stem[OVL_ADAPTOR_TYPE_NUM] = {
 	[OVL_ADAPTOR_TYPE_MERGE]	= "merge",
 };
 
+static const struct mtk_ddp_comp_funcs _ethdr = {
+	.clk_enable = mtk_ethdr_clk_enable,
+	.clk_disable = mtk_ethdr_clk_disable,
+};
+
+static const struct mtk_ddp_comp_funcs _merge = {
+	.clk_enable = mtk_merge_clk_enable,
+	.clk_disable = mtk_merge_clk_disable,
+};
+
+static const struct mtk_ddp_comp_funcs _rdma = {
+	.clk_enable = mtk_mdp_rdma_clk_enable,
+	.clk_disable = mtk_mdp_rdma_clk_disable,
+};
+
 static const struct ovl_adaptor_comp_match comp_matches[OVL_ADAPTOR_ID_MAX] = {
-	[OVL_ADAPTOR_ETHDR0] = { OVL_ADAPTOR_TYPE_ETHDR, DDP_COMPONENT_ETHDR_MIXER, 0 },
-	[OVL_ADAPTOR_MDP_RDMA0] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA0, 0 },
-	[OVL_ADAPTOR_MDP_RDMA1] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA1, 1 },
-	[OVL_ADAPTOR_MDP_RDMA2] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA2, 2 },
-	[OVL_ADAPTOR_MDP_RDMA3] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA3, 3 },
-	[OVL_ADAPTOR_MDP_RDMA4] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA4, 4 },
-	[OVL_ADAPTOR_MDP_RDMA5] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA5, 5 },
-	[OVL_ADAPTOR_MDP_RDMA6] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA6, 6 },
-	[OVL_ADAPTOR_MDP_RDMA7] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA7, 7 },
-	[OVL_ADAPTOR_MERGE0] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE1, 1 },
-	[OVL_ADAPTOR_MERGE1] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE2, 2 },
-	[OVL_ADAPTOR_MERGE2] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE3, 3 },
-	[OVL_ADAPTOR_MERGE3] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE4, 4 },
+	[OVL_ADAPTOR_ETHDR0] = { OVL_ADAPTOR_TYPE_ETHDR, DDP_COMPONENT_ETHDR_MIXER, 0, &_ethdr },
+	[OVL_ADAPTOR_MDP_RDMA0] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA0, 0, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA1] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA1, 1, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA2] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA2, 2, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA3] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA3, 3, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA4] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA4, 4, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA5] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA5, 5, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA6] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA6, 6, &_rdma },
+	[OVL_ADAPTOR_MDP_RDMA7] = { OVL_ADAPTOR_TYPE_MDP_RDMA, DDP_COMPONENT_MDP_RDMA7, 7, &_rdma },
+	[OVL_ADAPTOR_MERGE0] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE1, 1, &_merge },
+	[OVL_ADAPTOR_MERGE1] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE2, 2, &_merge },
+	[OVL_ADAPTOR_MERGE2] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE3, 3, &_merge },
+	[OVL_ADAPTOR_MERGE3] = { OVL_ADAPTOR_TYPE_MERGE, DDP_COMPONENT_MERGE4, 4, &_merge },
 };
 
 void mtk_ovl_adaptor_layer_config(struct device *dev, unsigned int idx,
@@ -187,73 +203,34 @@ void mtk_ovl_adaptor_stop(struct device *dev)
 
 int mtk_ovl_adaptor_clk_enable(struct device *dev)
 {
-	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
-	struct device *comp;
-	int ret;
 	int i;
-
-	for (i = 0; i < OVL_ADAPTOR_MERGE0; i++) {
-		comp = ovl_adaptor->ovl_adaptor_comp[i];
-		ret = pm_runtime_get_sync(comp);
-		if (ret < 0) {
-			dev_err(dev, "Failed to enable power domain %d, err %d\n", i, ret);
-			goto pwr_err;
-		}
-	}
+	int ret;
+	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 
 	for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
-		comp = ovl_adaptor->ovl_adaptor_comp[i];
-
-		if (i < OVL_ADAPTOR_MERGE0)
-			ret = mtk_mdp_rdma_clk_enable(comp);
-		else if (i < OVL_ADAPTOR_ETHDR0)
-			ret = mtk_merge_clk_enable(comp);
-		else
-			ret = mtk_ethdr_clk_enable(comp);
+		dev = ovl_adaptor->ovl_adaptor_comp[i];
+		if (!dev)
+			continue;
+		ret = comp_matches[i].funcs->clk_enable(dev);
 		if (ret) {
-			dev_err(dev, "Failed to enable clock %d, err %d\n", i, ret);
-			goto clk_err;
+			while (--i >= 0)
+				comp_matches[i].funcs->clk_disable(dev);
+			return ret;
 		}
 	}
-
-	return ret;
-
-clk_err:
-	while (--i >= 0) {
-		comp = ovl_adaptor->ovl_adaptor_comp[i];
-		if (i < OVL_ADAPTOR_MERGE0)
-			mtk_mdp_rdma_clk_disable(comp);
-		else if (i < OVL_ADAPTOR_ETHDR0)
-			mtk_merge_clk_disable(comp);
-		else
-			mtk_ethdr_clk_disable(comp);
-	}
-	i = OVL_ADAPTOR_MERGE0;
-
-pwr_err:
-	while (--i >= 0)
-		pm_runtime_put(ovl_adaptor->ovl_adaptor_comp[i]);
-
-	return ret;
+	return 0;
 }
 
 void mtk_ovl_adaptor_clk_disable(struct device *dev)
 {
-	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
-	struct device *comp;
 	int i;
+	struct mtk_disp_ovl_adaptor *ovl_adaptor = dev_get_drvdata(dev);
 
 	for (i = 0; i < OVL_ADAPTOR_ID_MAX; i++) {
-		comp = ovl_adaptor->ovl_adaptor_comp[i];
-
-		if (i < OVL_ADAPTOR_MERGE0) {
-			mtk_mdp_rdma_clk_disable(comp);
-			pm_runtime_put(comp);
-		} else if (i < OVL_ADAPTOR_ETHDR0) {
-			mtk_merge_clk_disable(comp);
-		} else {
-			mtk_ethdr_clk_disable(comp);
-		}
+		dev = ovl_adaptor->ovl_adaptor_comp[i];
+		if (!dev)
+			continue;
+		comp_matches[i].funcs->clk_disable(dev);
 	}
 }
 
-- 
2.18.0