Padding is a new display module on MT8188, it provides ability
to add pixels to width and height of a layer with specified colors.
Due to hardware design, Mixer in VDOSYS1 requires width of a layer
to be 2-pixel-align, or 4-pixel-align when ETHDR is enabled,
we need Padding to deal with odd width.
Signed-off-by: Hsiao Chien Sung <shawn.sung@xxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/Makefile | 3 +-
drivers/gpu/drm/mediatek/mtk_disp_drv.h | 3 +
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 1 +
drivers/gpu/drm/mediatek/mtk_drm_drv.h | 2 +-
drivers/gpu/drm/mediatek/mtk_padding.c | 206 ++++++++++++++++++++++++
5 files changed, 213 insertions(+), 2 deletions(-)
create mode 100644 drivers/gpu/drm/mediatek/mtk_padding.c
diff --git a/drivers/gpu/drm/mediatek/Makefile b/drivers/gpu/drm/mediatek/Makefile
index d4d193f60271..5e4436403b8d 100644
--- a/drivers/gpu/drm/mediatek/Makefile
+++ b/drivers/gpu/drm/mediatek/Makefile
@@ -16,7 +16,8 @@ mediatek-drm-y := mtk_disp_aal.o \
mtk_dsi.o \
mtk_dpi.o \
mtk_ethdr.o \
- mtk_mdp_rdma.o
+ mtk_mdp_rdma.o \
+ mtk_padding.o
obj-$(CONFIG_DRM_MEDIATEK) += mediatek-drm.o
diff --git a/drivers/gpu/drm/mediatek/mtk_disp_drv.h b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
index 2254038519e1..f9fdb1268aa5 100644
--- a/drivers/gpu/drm/mediatek/mtk_disp_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_disp_drv.h
@@ -157,4 +157,7 @@ void mtk_mdp_rdma_config(struct device *dev, struct mtk_mdp_rdma_cfg *cfg,
const u32 *mtk_mdp_rdma_get_formats(struct device *dev);
size_t mtk_mdp_rdma_get_num_formats(struct device *dev);
+int mtk_padding_clk_enable(struct device *dev);
+void mtk_padding_clk_disable(struct device *dev);
+void mtk_padding_config(struct device *dev, struct cmdq_pkt *cmdq_pkt);
#endif
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 93552d76b6e7..cde69f39a066 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -973,6 +973,7 @@ static struct platform_driver * const mtk_drm_drivers[] = {
&mtk_dsi_driver,
&mtk_ethdr_driver,
&mtk_mdp_rdma_driver,
+ &mtk_padding_driver,
};
static int __init mtk_drm_init(void)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
index eb2fd45941f0..562f2db47add 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
@@ -64,5 +64,5 @@ extern struct platform_driver mtk_dpi_driver;
extern struct platform_driver mtk_dsi_driver;
extern struct platform_driver mtk_ethdr_driver;
extern struct platform_driver mtk_mdp_rdma_driver;
-
+extern struct platform_driver mtk_padding_driver;
#endif /* MTK_DRM_DRV_H */
diff --git a/drivers/gpu/drm/mediatek/mtk_padding.c b/drivers/gpu/drm/mediatek/mtk_padding.c
new file mode 100644
index 000000000000..2a29a5fa0a68
--- /dev/null
+++ b/drivers/gpu/drm/mediatek/mtk_padding.c
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 MediaTek Inc.
+ */
+
+#include <linux/clk.h>
+#include <linux/component.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/soc/mediatek/mtk-cmdq.h>
+
+#include "mtk_disp_drv.h"
+#include "mtk_drm_crtc.h"
+#include "mtk_drm_ddp_comp.h"
+
+#define PADDING_CONTROL_REG 0x00
+#define PADDING_BYPASS BIT(0)
+#define PADDING_ENABLE BIT(1)
+#define PADDING_PIC_SIZE_REG 0x04
+#define PADDING_H_REG 0x08 /* horizontal */
+#define PADDING_V_REG 0x0c /* vertical */
+#define PADDING_COLOR_REG 0x10
+
+#define PADDING_PIC_SIZE(w, h) ( \
+ ((w) & GENMASK(15, 0)) | \
+ (((h) & GENMASK(15, 0)) >> 16) \
+)
+
+#define PADDING_H(right) (((right) & GENMASK(12, 0)) >> 16)
+
+#define PADDING_V(bottom) (((bottom) & GENMASK(12, 0)) >> 16)
+
+/* 10-bit RGB without alpha */
+#define PADDING_COLOR(r, g, b) ( \
+ ((r) & GENMASK(9, 0)) << 22 | \
+ ((g) & GENMASK(9, 0)) << 12 | \
+ ((b) & GENMASK(9, 0)) << 2 \
+)
+
+/**
+ * struct mtk_padding - basic information of Padding
+ * @clk: Clock of the module
+ * @reg: Virtual address of the Padding for CPU to access
+ * @cmdq_reg: CMDQ setting of the Padding
+ *
+ * Every Padding should have different clock source, register base, and
+ * CMDQ settings, we stored these differences all together.
+ */
+struct mtk_padding {
+ struct clk *clk;
+ void __iomem *reg;
+ struct cmdq_client_reg cmdq_reg;
+};
+
+int mtk_padding_clk_enable(struct device *dev)
+{
+ struct mtk_padding *padding = dev_get_drvdata(dev);
+
+ return clk_prepare_enable(padding->clk);
+}
+
+void mtk_padding_clk_disable(struct device *dev)
+{
+ struct mtk_padding *padding = dev_get_drvdata(dev);
+
+ clk_disable_unprepare(padding->clk);
+}
+
+void mtk_padding_start(struct device *dev)
+{
+ struct mtk_padding *padding = dev_get_drvdata(dev);
+
+ writel(PADDING_ENABLE | PADDING_BYPASS,
+ padding->reg + PADDING_CONTROL_REG);
+
+ /*
+ * notice that even the padding is in bypass mode,
+ * all the settings must be cleared to 0 or
+ * undefined behaviors could happen
+ */
+ writel(0, padding->reg + PADDING_PIC_SIZE_REG);
+ writel(0, padding->reg + PADDING_H_REG);
+ writel(0, padding->reg + PADDING_V_REG);
+ writel(0, padding->reg + PADDING_COLOR_REG);
+}
+
+void mtk_padding_stop(struct device *dev)
+{
+ struct mtk_padding *padding = dev_get_drvdata(dev);
+
+ writel_relaxed(0, padding->reg + PADDING_CONTROL_REG);
+}
+
+void mtk_padding_config(struct device *dev, struct cmdq_pkt *cmdq_pkt,
+ u32 width, u32 height, u32 right, u32 bottom, u32 color)
+{
+ bool bypass = true;
+ struct mtk_padding *padding = dev_get_drvdata(dev);
+
+ if (width | height | right | bottom | color)
+ bypass = false;
+
+ mtk_ddp_write_mask(cmdq_pkt, bypass,
+ &padding->cmdq_reg, padding->reg,
+ PADDING_CONTROL_REG, PADDING_BYPASS);
+
+ mtk_ddp_write_mask(cmdq_pkt, PADDING_PIC_SIZE(width, height),
+ &padding->cmdq_reg, padding->reg,
+ PADDING_PIC_SIZE_REG, GENMASK(31, 0));
+
+ mtk_ddp_write_mask(cmdq_pkt, PADDING_H(right),
+ &padding->cmdq_reg, padding->reg,
+ PADDING_H_REG, GENMASK(31, 0));
+
+ mtk_ddp_write_mask(cmdq_pkt, PADDING_V(bottom),
+ &padding->cmdq_reg, padding->reg,
+ PADDING_V_REG, GENMASK(31, 0));
+
+ mtk_ddp_write_mask(cmdq_pkt, PADDING_V(bottom),
+ &padding->cmdq_reg, padding->reg,
+ PADDING_V_REG, GENMASK(31, 0));
+}
+
+static int mtk_padding_bind(struct device *dev, struct device *master, void *data)
+{
+ return 0;
+}
+
+static void mtk_padding_unbind(struct device *dev, struct device *master, void *data)
+{
+}
+
+static const struct component_ops mtk_padding_component_ops = {
+ .bind = mtk_padding_bind,
+ .unbind = mtk_padding_unbind,
+};
+
+static int mtk_padding_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_padding *priv;
+ struct resource *res;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->clk = devm_clk_get(dev, NULL);
+ if (IS_ERR(priv->clk)) {
+ dev_err(dev, "failed to get clk\n");
+ return PTR_ERR(priv->clk);
+ }
+
+ priv->reg = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+ if (IS_ERR(priv->reg)) {
+ dev_err(dev, "failed to do ioremap\n");
+ return PTR_ERR(priv->reg);
+ }
+
+#if IS_REACHABLE(CONFIG_MTK_CMDQ)
+ ret = cmdq_dev_get_client_reg(dev, &priv->cmdq_reg, 0);
+ if (ret) {
+ dev_err(dev, "failed to get gce client reg\n");
+ return ret;
+ }
+#endif
+
+ platform_set_drvdata(pdev, priv);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = component_add(dev, &mtk_padding_component_ops);
+ if (ret) {
+ pm_runtime_disable(dev);
+ return dev_err_probe(dev, ret, "failed to add component\n");
+ }
+
+ return 0;
+}
+
+static int mtk_padding_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &mtk_padding_component_ops);
+ return 0;
+}
+
+static const struct of_device_id mtk_padding_driver_dt_match[] = {
+ { .compatible = "mediatek,mt8188-padding" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_padding_driver_dt_match);
+
+struct platform_driver mtk_padding_driver = {
+ .probe = mtk_padding_probe,
+ .remove = mtk_padding_remove,
+ .driver = {
+ .name = "mediatek-padding",
+ .owner = THIS_MODULE,
+ .of_match_table = mtk_padding_driver_dt_match,
+ },
+};
--
2.18.0
