drm/vs: simple encoder

add simple encoder for dsi bridge

[jh80.chung: taken from https://patchew.org/linux/20231204123315.28456-1-keith.zhao@starfivetech.com/]

Change-Id: Ib725116fa438d27b920b5b2b5092be1e5d2234b6
Signed-off-by: Keith Zhao <keith.zhao@starfivetech.com>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/gpu/drm/verisilicon/Makefile b/drivers/gpu/drm/verisilicon/Makefile
index 71fadaf..cd5d0a9 100644 (file)
--- a/drivers/gpu/drm/verisilicon/Makefile
+++ b/drivers/gpu/drm/verisilicon/Makefile
@@ -5,6 +5,8 @@ vs_drm-objs := vs_dc_hw.o \
                vs_crtc.o \
                vs_drv.o \
                vs_modeset.o \
-               vs_plane.o
+               vs_plane.o \
+               vs_simple_enc.o
+
 vs_drm-$(CONFIG_DRM_VERISILICON_STARFIVE_HDMI) += starfive_hdmi.o
 obj-$(CONFIG_DRM_VERISILICON) += vs_drm.o

diff --git a/drivers/gpu/drm/verisilicon/vs_drv.c b/drivers/gpu/drm/verisilicon/vs_drv.c
index d7e5199..946f137 100644 (file)
--- a/drivers/gpu/drm/verisilicon/vs_drv.c
+++ b/drivers/gpu/drm/verisilicon/vs_drv.c
@@ -23,6 +23,7 @@
 #include "vs_drv.h"
 #include "vs_modeset.h"
 #include "vs_dc.h"
+#include "vs_simple_enc.h"
 
 #define DRV_NAME       "verisilicon"
 #define DRV_DESC       "Verisilicon DRM driver"
@@ -217,6 +218,7 @@ static struct platform_driver *drm_sub_drivers[] = {
 #ifdef CONFIG_DRM_VERISILICON_STARFIVE_HDMI
        &starfive_hdmi_driver,
 #endif
+       &simple_encoder_driver,
 };
 
 static struct component_match *vs_drm_match_add(struct device *dev)

diff --git a/drivers/gpu/drm/verisilicon/vs_simple_enc.c b/drivers/gpu/drm/verisilicon/vs_simple_enc.c
new file mode 100644 (file)
index 0000000..c5a8d82
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_simple_enc.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 VeriSilicon Holdings Co., Ltd.
+ */
+#include <linux/component.h>
+#include <linux/of_device.h>
+#include <linux/module.h>
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_bridge.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_of.h>
+#include <linux/regmap.h>
+#include <linux/media-bus-format.h>
+#include <linux/mfd/syscon.h>
+
+#include "vs_crtc.h"
+#include "vs_simple_enc.h"
+
+static const struct simple_encoder_priv dsi_priv = {
+       .encoder_type = DRM_MODE_ENCODER_DSI
+};
+
+static inline struct simple_encoder *to_simple_encoder(struct drm_encoder *enc)
+{
+       return container_of(enc, struct simple_encoder, encoder);
+}
+
+static int encoder_parse_dt(struct device *dev)
+{
+       struct simple_encoder *simple = dev_get_drvdata(dev);
+       unsigned int args[2];
+
+       simple->dss_regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node,
+                                                                 "starfive,syscon",
+                                                                 2, args);
+
+       if (IS_ERR(simple->dss_regmap)) {
+               return dev_err_probe(dev, PTR_ERR(simple->dss_regmap),
+                                    "getting the regmap failed\n");
+       }
+
+       simple->offset = args[0];
+       simple->mask = args[1];
+
+       return 0;
+}
+
+void encoder_atomic_enable(struct drm_encoder *encoder,
+                          struct drm_atomic_state *state)
+{
+       struct simple_encoder *simple = to_simple_encoder(encoder);
+
+       regmap_update_bits(simple->dss_regmap, simple->offset, simple->mask,
+                          simple->mask);
+}
+
+int encoder_atomic_check(struct drm_encoder *encoder,
+                        struct drm_crtc_state *crtc_state,
+                        struct drm_connector_state *conn_state)
+{
+       struct vs_crtc_state *vs_crtc_state = to_vs_crtc_state(crtc_state);
+       struct drm_connector *connector = conn_state->connector;
+       int ret = 0;
+
+       struct drm_bridge *first_bridge = drm_bridge_chain_get_first_bridge(encoder);
+       struct drm_bridge_state *bridge_state = ERR_PTR(-EINVAL);
+
+       vs_crtc_state->encoder_type = encoder->encoder_type;
+
+       if (first_bridge && first_bridge->funcs->atomic_duplicate_state)
+               bridge_state = drm_atomic_get_bridge_state(crtc_state->state, first_bridge);
+
+       if (IS_ERR(bridge_state)) {
+               if (connector->display_info.num_bus_formats)
+                       vs_crtc_state->output_fmt = connector->display_info.bus_formats[0];
+               else
+                       vs_crtc_state->output_fmt = MEDIA_BUS_FMT_FIXED;
+       } else {
+               vs_crtc_state->output_fmt = bridge_state->input_bus_cfg.format;
+       }
+
+       switch (vs_crtc_state->output_fmt) {
+       case MEDIA_BUS_FMT_FIXED:
+       case MEDIA_BUS_FMT_RGB565_1X16:
+       case MEDIA_BUS_FMT_RGB666_1X18:
+       case MEDIA_BUS_FMT_RGB888_1X24:
+       case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+       case MEDIA_BUS_FMT_RGB101010_1X30:
+       case MEDIA_BUS_FMT_UYYVYY8_0_5X24:
+       case MEDIA_BUS_FMT_UYVY8_1X16:
+       case MEDIA_BUS_FMT_YUV8_1X24:
+       case MEDIA_BUS_FMT_UYYVYY10_0_5X30:
+       case MEDIA_BUS_FMT_UYVY10_1X20:
+       case MEDIA_BUS_FMT_YUV10_1X30:
+               ret = 0;
+               break;
+       default:
+               ret = -EINVAL;
+               break;
+       }
+
+       /* If MEDIA_BUS_FMT_FIXED, set it to default value */
+       if (vs_crtc_state->output_fmt == MEDIA_BUS_FMT_FIXED)
+               vs_crtc_state->output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
+
+       return ret;
+}
+
+static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
+       .atomic_check = encoder_atomic_check,
+       .atomic_enable = encoder_atomic_enable,
+};
+
+static int encoder_bind(struct device *dev, struct device *master, void *data)
+{
+       struct drm_device *drm_dev = data;
+       struct simple_encoder *simple = dev_get_drvdata(dev);
+       struct drm_encoder *encoder;
+       struct drm_bridge *bridge;
+       int ret;
+
+       encoder = &simple->encoder;
+
+       ret = drmm_encoder_init(drm_dev, encoder, NULL, simple->priv->encoder_type, NULL);
+       if (ret)
+               return ret;
+
+       drm_encoder_helper_add(encoder, &encoder_helper_funcs);
+
+       encoder->possible_crtcs =
+                       drm_of_find_possible_crtcs(drm_dev, dev->of_node);
+
+       /* output port is port1*/
+       bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
+       if (IS_ERR(bridge))
+               return 0;
+
+       return drm_bridge_attach(encoder, bridge, NULL, 0);
+}
+
+static const struct component_ops encoder_component_ops = {
+       .bind = encoder_bind,
+};
+
+static const struct of_device_id simple_encoder_dt_match[] = {
+       { .compatible = "starfive,dsi-encoder", .data = &dsi_priv},
+       {},
+};
+MODULE_DEVICE_TABLE(of, simple_encoder_dt_match);
+
+static int encoder_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct simple_encoder *simple;
+       int ret;
+
+       simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
+       if (!simple)
+               return -ENOMEM;
+
+       simple->priv = of_device_get_match_data(dev);
+
+       simple->dev = dev;
+
+       dev_set_drvdata(dev, simple);
+
+       ret = encoder_parse_dt(dev);
+       if (ret)
+               return ret;
+
+       return component_add(dev, &encoder_component_ops);
+}
+
+static int encoder_remove(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+
+       component_del(dev, &encoder_component_ops);
+       dev_set_drvdata(dev, NULL);
+
+       return 0;
+}
+
+struct platform_driver simple_encoder_driver = {
+       .probe = encoder_probe,
+       .remove = encoder_remove,
+       .driver = {
+               .name = "vs-simple-encoder",
+               .of_match_table = of_match_ptr(simple_encoder_dt_match),
+       },
+};
+
+MODULE_DESCRIPTION("Simple Encoder Driver");
+MODULE_LICENSE("GPL");

diff --git a/drivers/gpu/drm/verisilicon/vs_simple_enc.h b/drivers/gpu/drm/verisilicon/vs_simple_enc.h
new file mode 100644 (file)
index 0000000..fb33ca9
--- /dev/null
+++ b/drivers/gpu/drm/verisilicon/vs_simple_enc.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2022 VeriSilicon Holdings Co., Ltd.
+ */
+
+#ifndef __VS_SIMPLE_ENC_H_
+#define __VS_SIMPLE_ENC_H_
+
+struct simple_encoder_priv {
+       unsigned char encoder_type;
+};
+
+struct simple_encoder {
+       struct drm_encoder encoder;
+       struct device *dev;
+       const struct simple_encoder_priv *priv;
+       struct regmap *dss_regmap;
+       unsigned int offset;
+       unsigned int mask;
+};
+
+extern struct platform_driver simple_encoder_driver;
+#endif /* __VS_SIMPLE_ENC_H_ */