[PATCH v6 6/7] drm/mediatek: add MERGE support for mediatek-drm

[jason-jh.lin <jason-jh.lin@mediatek.com>]

Add MERGE engine file:
MERGE module is used to merge two slice-per-line inputs
into one side-by-side output.

Signed-off-by: jason-jh.lin <jason-jh.lin@mediatek.com>
---
This patch is base on [1]

[1] dt-bindings: mediatek: display: add mt8195 SoC binding
https://patchwork.kernel.org/project/linux-mediatek/patch/20210805171346.24249-5-jason-jh.lin@mediatek.com/
---
 drivers/gpu/drm/mediatek/Makefile           |   1 +
 drivers/gpu/drm/mediatek/mtk_disp_drv.h     |   8 +
 drivers/gpu/drm/mediatek/mtk_disp_merge.c   | 263 ++++++++++++++++++++
 drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |   1 +
 drivers/gpu/drm/mediatek/mtk_drm_drv.c      |   4 +-
 drivers/gpu/drm/mediatek/mtk_drm_drv.h      |   1 +
 6 files changed, 277 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/mediatek/mtk_disp_merge.c

diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index dc54a7a69005..538e0087a44c 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -3,6 +3,7 @@
 mediatek-drm-y := mtk_disp_ccorr.o \
 		  mtk_disp_color.o \
 		  mtk_disp_gamma.o \
+		  mtk_disp_merge.o \
 		  mtk_disp_ovl.o \
 		  mtk_disp_rdma.o \
 		  mtk_drm_crtc.o \
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index cafd9df2d63b..f407cd9d873e 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -46,6 +46,14 @@ void mtk_gamma_set_common(void __iomem *regs, struct drm_crtc_state *state);
 void mtk_gamma_start(struct device *dev);
 void mtk_gamma_stop(struct device *dev);
 
+int mtk_merge_clk_enable(struct device *dev);
+void mtk_merge_clk_disable(struct device *dev);
+void mtk_merge_config(struct device *dev, unsigned int width,
+		      unsigned int height, unsigned int vrefresh,
+		      unsigned int bpc, struct cmdq_pkt *cmdq_pkt);
+void mtk_merge_start(struct device *dev);
+void mtk_merge_stop(struct device *dev);
+
 void mtk_ovl_bgclr_in_on(struct device *dev);
 void mtk_ovl_bgclr_in_off(struct device *dev);
 void mtk_ovl_bypass_shadow(struct device *dev);
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_merge.c b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
new file mode 100644
index 000000000000..f3d262792054
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_disp_merge.c
@@ -0,0 +1,263 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2021 MediaTek Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/of_device.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+
+#include "mtk_drm_ddp_comp.h"
+#include "mtk_drm_drv.h"
+#include "mtk_disp_drv.h"
+
+#define DISP_REG_MERGE_CTRL		0x000
+#define MERGE_EN			1
+#define DISP_REG_MERGE_CFG_0		0x010
+#define DISP_REG_MERGE_CFG_4		0x020
+#define DISP_REG_MERGE_CFG_10		0x038
+/* no swap */
+#define SWAP_MODE			0
+#define FLD_SWAP_MODE			GENMASK(4, 0)
+#define DISP_REG_MERGE_CFG_12		0x040
+#define CFG_10_10_1PI_2PO_BUF_MODE	6
+#define CFG_10_10_2PI_2PO_BUF_MODE	8
+#define FLD_CFG_MERGE_MODE		GENMASK(4, 0)
+#define DISP_REG_MERGE_CFG_24		0x070
+#define DISP_REG_MERGE_CFG_25		0x074
+#define DISP_REG_MERGE_CFG_36		0x0a0
+#define ULTRA_EN			1
+#define PREULTRA_EN			1
+#define HALT_FOR_DVFS_EN		0
+#define FLD_ULTRA_EN			GENMASK(0, 0)
+#define FLD_PREULTRA_EN			GENMASK(4, 4)
+#define FLD_HALT_FOR_DVFS_EN		GENMASK(8, 8)
+#define DISP_REG_MERGE_CFG_37		0x0a4
+/* 0: Off, 1: SRAM0, 2: SRAM1, 3: SRAM0 + SRAM1 */
+#define BUFFER_MODE			3
+#define FLD_BUFFER_MODE			GENMASK(1, 0)
+#define DISP_REG_MERGE_CFG_38		0x0a8
+#define FLD_VDE_BLOCK_ULTRA		GENMASK(0, 0)
+#define FLD_VALID_TH_BLOCK_ULTRA	GENMASK(4, 4)
+#define FLD_ULTRA_FIFO_VALID_TH		GENMASK(31, 16)
+#define DISP_REG_MERGE_CFG_39		0x0ac
+#define FLD_NVDE_FORCE_PREULTRA		GENMASK(8, 8)
+#define FLD_NVALID_TH_FORCE_PREULTRA	GENMASK(12, 12)
+#define FLD_PREULTRA_FIFO_VALID_TH	GENMASK(31, 16)
+#define DISP_REG_MERGE_CFG_40		0x0b0
+/* 6 us, 600M pixel/sec */
+#define ULTRA_TH_LOW			(6 * 600)
+/* 8 us, 600M pixel/sec */
+#define ULTRA_TH_HIGH			(8 * 600)
+#define FLD_ULTRA_TH_LOW		GENMASK(15, 0)
+#define FLD_ULTRA_TH_HIGH		GENMASK(31, 16)
+#define DISP_REG_MERGE_CFG_41		0x0b4
+/* 8 us, 600M pixel/sec */
+#define PREULTRA_TH_LOW			(8 * 600)
+/* 9 us, 600M pixel/sec */
+#define PREULTRA_TH_HIGH		(9 * 600)
+#define FLD_PREULTRA_TH_LOW		GENMASK(15, 0)
+#define FLD_PREULTRA_TH_HIGH		GENMASK(31, 16)
+
+struct mtk_disp_merge {
+	void __iomem *regs;
+	struct clk *clk;
+	struct clk *async_clk;
+	struct cmdq_client_reg		cmdq_reg;
+	bool				fifo_en;
+};
+
+void mtk_merge_start(struct device *dev)
+{
+	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
+
+	writel(MERGE_EN, priv->regs + DISP_REG_MERGE_CTRL);
+}
+
+void mtk_merge_stop(struct device *dev)
+{
+	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
+
+	writel(0x0, priv->regs + DISP_REG_MERGE_CTRL);
+}
+
+static void mtk_merge_fifo_setting(struct mtk_disp_merge *priv,
+				   struct cmdq_pkt *handle)
+{
+	mtk_ddp_write_mask(handle, ULTRA_EN | PREULTRA_EN << 4 | HALT_FOR_DVFS_EN << 8,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_36,
+			   FLD_ULTRA_EN | FLD_PREULTRA_EN | FLD_HALT_FOR_DVFS_EN);
+
+	mtk_ddp_write_mask(handle, BUFFER_MODE,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_37,
+			   FLD_BUFFER_MODE);
+
+	mtk_ddp_write_mask(handle, 0,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_38,
+			   FLD_VDE_BLOCK_ULTRA | FLD_VALID_TH_BLOCK_ULTRA |
+			   FLD_ULTRA_FIFO_VALID_TH);
+
+	mtk_ddp_write_mask(handle, 0,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_39,
+			   FLD_NVDE_FORCE_PREULTRA | FLD_NVALID_TH_FORCE_PREULTRA |
+			   FLD_PREULTRA_FIFO_VALID_TH);
+
+	mtk_ddp_write_mask(handle, ULTRA_TH_LOW | ULTRA_TH_HIGH << 16,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_40,
+			   FLD_ULTRA_TH_LOW | FLD_ULTRA_TH_HIGH);
+
+	mtk_ddp_write_mask(handle, PREULTRA_TH_LOW | PREULTRA_TH_HIGH << 16,
+			   &priv->cmdq_reg, priv->regs, DISP_REG_MERGE_CFG_41,
+			   FLD_PREULTRA_TH_LOW | FLD_PREULTRA_TH_HIGH);
+}
+
+void mtk_merge_config(struct device *dev, unsigned int w,
+		      unsigned int h, unsigned int vrefresh,
+		      unsigned int bpc, struct cmdq_pkt *handle)
+{
+	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
+	unsigned int mode = CFG_10_10_1PI_2PO_BUF_MODE;
+
+	if (!h || !w) {
+		dev_err(dev, "%s: input width(%d) or height(%d) is invalid\n", __func__, w, h);
+		return;
+	}
+
+	if (priv->fifo_en) {
+		mtk_merge_fifo_setting(priv, handle);
+		mode = CFG_10_10_2PI_2PO_BUF_MODE;
+	}
+
+	mtk_ddp_write(handle, h << 16 | w, &priv->cmdq_reg, priv->regs,
+		      DISP_REG_MERGE_CFG_0);
+	mtk_ddp_write(handle, h << 16 | w, &priv->cmdq_reg, priv->regs,
+		      DISP_REG_MERGE_CFG_4);
+	mtk_ddp_write(handle, h << 16 | w, &priv->cmdq_reg, priv->regs,
+		      DISP_REG_MERGE_CFG_24);
+	mtk_ddp_write(handle, h << 16 | w, &priv->cmdq_reg, priv->regs,
+		      DISP_REG_MERGE_CFG_25);
+	mtk_ddp_write_mask(handle, SWAP_MODE, &priv->cmdq_reg, priv->regs,
+			   DISP_REG_MERGE_CFG_10, FLD_SWAP_MODE);
+	mtk_ddp_write_mask(handle, mode, &priv->cmdq_reg, priv->regs,
+			   DISP_REG_MERGE_CFG_12, FLD_CFG_MERGE_MODE);
+}
+
+int mtk_merge_clk_enable(struct device *dev)
+{
+	int ret = 0;
+	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
+
+	ret = clk_prepare_enable(priv->clk);
+	if (ret)
+		pr_err("merge clk prepare enable failed\n");
+
+	if (priv->async_clk) {
+		ret = clk_prepare_enable(priv->async_clk);
+		if (ret)
+			pr_err("async clk prepare enable failed\n");
+	}
+
+	return ret;
+}
+
+void mtk_merge_clk_disable(struct device *dev)
+{
+	struct mtk_disp_merge *priv = dev_get_drvdata(dev);
+
+	if (priv->async_clk)
+		clk_disable_unprepare(priv->async_clk);
+
+	clk_disable_unprepare(priv->clk);
+}
+
+static int mtk_disp_merge_bind(struct device *dev, struct device *master,
+			       void *data)
+{
+	return 0;
+}
+
+static void mtk_disp_merge_unbind(struct device *dev, struct device *master,
+				  void *data)
+{
+}
+
+static const struct component_ops mtk_disp_merge_component_ops = {
+	.bind	= mtk_disp_merge_bind,
+	.unbind = mtk_disp_merge_unbind,
+};
+
+static int mtk_disp_merge_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct mtk_disp_merge *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	priv->regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(priv->regs)) {
+		dev_err(dev, "failed to ioremap merge\n");
+		return PTR_ERR(priv->regs);
+	}
+
+	priv->clk = devm_clk_get(dev, NULL);
+	if (IS_ERR(priv->clk)) {
+		dev_err(dev, "failed to get merge clk\n");
+		return PTR_ERR(priv->clk);
+	}
+
+	priv->async_clk = of_clk_get(dev->of_node, 1);
+	if (IS_ERR(priv->async_clk)) {
+		ret = PTR_ERR(priv->async_clk);
+		dev_dbg(dev, "No merge async clock: %d\n", ret);
+		priv->async_clk = NULL;
+	}
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+	ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
+	if (ret)
+		dev_dbg(dev, "get mediatek,gce-client-reg fail!\n");
+#endif
+
+	priv->fifo_en = of_property_read_bool(dev->of_node,
+					      "mediatek,merge-fifo-en");
+
+	platform_set_drvdata(pdev, priv);
+
+	ret = component_add(dev, &mtk_disp_merge_component_ops);
+	if (ret != 0)
+		dev_err(dev, "Failed to add component: %d\n", ret);
+
+	return ret;
+}
+
+static int mtk_disp_merge_remove(struct platform_device *pdev)
+{
+	component_del(&pdev->dev, &mtk_disp_merge_component_ops);
+
+	return 0;
+}
+
+static const struct of_device_id mtk_disp_merge_driver_dt_match[] = {
+	{ .compatible = "mediatek,mt8195-disp-merge", },
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, mtk_disp_merge_driver_dt_match);
+
+struct platform_driver mtk_disp_merge_driver = {
+	.probe = mtk_disp_merge_probe,
+	.remove = mtk_disp_merge_remove,
+	.driver = {
+		.name = "mediatek-disp-merge",
+		.owner = THIS_MODULE,
+		.of_match_table = mtk_disp_merge_driver_dt_match,
+	},
+};
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
index 560be6bc9d0e..b42a47c06956 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h
@@ -25,6 +25,7 @@ enum mtk_ddp_comp_type {
 	MTK_DISP_DITHER,
 	MTK_DISP_DSC,
 	MTK_DISP_GAMMA,
+	MTK_DISP_MERGE,
 	MTK_DISP_MUTEX,
 	MTK_DISP_OD,
 	MTK_DISP_OVL,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index a95dc1006b82..5eb9c0a04447 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -532,13 +532,14 @@ static int mtk_drm_probe(struct platform_device *pdev)
 		private->comp_node[comp_id] = of_node_get(node);
 
 		/*
-		 * Currently only the CCORR, COLOR, GAMMA, OVL, RDMA, DSI, and DPI
+		 * Currently only the CCORR, COLOR, GAMMA, MERGE, OVL, RDMA, DSI, and DPI
 		 * blocks have separate component platform drivers and initialize their own
 		 * DDP component structure. The others are initialized here.
 		 */
 		if (comp_type == MTK_DISP_CCORR ||
 		    comp_type == MTK_DISP_COLOR ||
 		    comp_type == MTK_DISP_GAMMA ||
+		    comp_type == MTK_DISP_MERGE ||
 		    comp_type == MTK_DISP_OVL ||
 		    comp_type == MTK_DISP_OVL_2L ||
 		    comp_type == MTK_DISP_RDMA ||
@@ -639,6 +640,7 @@ static struct platform_driver * const mtk_drm_drivers[] = {
 	&mtk_disp_ccorr_driver,
 	&mtk_disp_color_driver,
 	&mtk_disp_gamma_driver,
+	&mtk_disp_merge_driver,
 	&mtk_disp_ovl_driver,
 	&mtk_disp_rdma_driver,
 	&mtk_dpi_driver,
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index 637f5669e895..0fa417219a69 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -49,6 +49,7 @@ struct mtk_drm_private {
 extern struct platform_driver mtk_disp_ccorr_driver;
 extern struct platform_driver mtk_disp_color_driver;
 extern struct platform_driver mtk_disp_gamma_driver;
+extern struct platform_driver mtk_disp_merge_driver;
 extern struct platform_driver mtk_disp_ovl_driver;
 extern struct platform_driver mtk_disp_rdma_driver;
 extern struct platform_driver mtk_dpi_driver;
-- 
2.18.0
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