From ce92f3508c05bff4f06a27f01e8f737b706ff48e Mon Sep 17 00:00:00 2001
From: Uros Majstorovic <majstor@majstor.org>
Date: Sat, 7 Aug 2021 00:46:38 +0200
Subject: initial commit

---
 .../rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c      | 411 +++++++++++++++++++++
 1 file changed, 411 insertions(+)
 create mode 100644 recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c

(limited to 'recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c')

diff --git a/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c b/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c
new file mode 100644
index 0000000..d3459cf
--- /dev/null
+++ b/recipes-kernel/linux/rvphone/cl-imx8/sn65dsi83/sn65dsi83_drv.c
@@ -0,0 +1,411 @@
+/*
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/device.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_graph.h>
+#include <linux/slab.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_edid.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_connector.h>
+#include <drm/drm_crtc_helper.h>
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+#include "sn65dsi83_timing.h"
+#include "sn65dsi83_brg.h"
+
+struct sn65dsi83 {
+    u8 channel_id;
+    enum drm_connector_status status;
+    bool powered;
+    struct drm_display_mode curr_mode;
+    struct drm_bridge bridge;
+    struct drm_connector connector;
+    struct device_node *host_node;
+    struct mipi_dsi_device *dsi;
+    struct sn65dsi83_brg *brg;
+};
+
+static int sn65dsi83_attach_dsi(struct sn65dsi83 *sn65dsi83);
+#define DRM_DEVICE(A) A->dev->dev
+/* Connector funcs */
+static struct sn65dsi83 *connector_to_sn65dsi83(struct drm_connector *connector)
+{
+    return container_of(connector, struct sn65dsi83, connector);
+}
+
+static int sn65dsi83_connector_get_modes(struct drm_connector *connector)
+{
+    struct sn65dsi83 *sn65dsi83 = connector_to_sn65dsi83(connector);
+    struct sn65dsi83_brg *brg = sn65dsi83->brg;
+    struct device *dev = connector->dev->dev;
+    struct drm_display_mode *mode;
+    u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
+    u32 *bus_flags = &connector->display_info.bus_flags;
+    int ret;
+
+    dev_info(dev, "%s\n",__func__);
+    mode = drm_mode_create(connector->dev);
+    if (!mode) {
+        DRM_DEV_ERROR(dev, "Failed to create display mode!\n");
+        return 0;
+    }
+
+    drm_display_mode_from_videomode(&brg->vm, mode);
+    mode->width_mm = brg->width_mm;
+    mode->height_mm = brg->height_mm;
+    mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+
+    drm_mode_probed_add(connector, mode);
+    drm_mode_connector_list_update(connector);
+
+    connector->display_info.width_mm = mode->width_mm;
+    connector->display_info.height_mm = mode->height_mm;
+
+    if (brg->vm.flags & DISPLAY_FLAGS_DE_HIGH)
+        *bus_flags |= DRM_BUS_FLAG_DE_HIGH;
+    if (brg->vm.flags & DISPLAY_FLAGS_DE_LOW)
+        *bus_flags |= DRM_BUS_FLAG_DE_LOW;
+    if (brg->vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+        *bus_flags |= DRM_BUS_FLAG_PIXDATA_NEGEDGE;
+    if (brg->vm.flags & DISPLAY_FLAGS_PIXDATA_POSEDGE)
+        *bus_flags |= DRM_BUS_FLAG_PIXDATA_POSEDGE;
+
+    ret = drm_display_info_set_bus_formats(&connector->display_info,
+                           &bus_format, 1);
+    if (ret)
+        return ret;
+
+    return 1;
+}
+
+static enum drm_mode_status
+sn65dsi83_connector_mode_valid(struct drm_connector *connector,
+                 struct drm_display_mode *mode)
+{
+    struct sn65dsi83 *sn65dsi83 = connector_to_sn65dsi83(connector);
+    struct device *dev = connector->dev->dev;
+	if (mode->clock > ( sn65dsi83->brg->vm.pixelclock / 1000 ))
+		return MODE_CLOCK_HIGH;
+
+    dev_info(dev, "%s: mode: %d*%d@%d is valid\n",__func__,
+            mode->hdisplay,mode->vdisplay,mode->clock);
+    return MODE_OK;
+}
+
+static struct drm_connector_helper_funcs sn65dsi83_connector_helper_funcs = {
+    .get_modes = sn65dsi83_connector_get_modes,
+    .mode_valid = sn65dsi83_connector_mode_valid,
+};
+
+static enum drm_connector_status
+sn65dsi83_connector_detect(struct drm_connector *connector, bool force)
+{
+    struct sn65dsi83 *sn65dsi83 = connector_to_sn65dsi83(connector);
+    struct device *dev = connector->dev->dev;
+    enum drm_connector_status status;
+    dev_info(dev, "%s\n",__func__);
+
+    status = connector_status_connected;
+    sn65dsi83->status = status;
+    return status;
+}
+
+int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
+                        uint32_t maxX, uint32_t maxY);
+
+static struct drm_connector_funcs sn65dsi83_connector_funcs = {
+    .dpms = drm_helper_connector_dpms,
+    .fill_modes = drm_helper_probe_single_connector_modes,
+    .detect = sn65dsi83_connector_detect,
+    .destroy = drm_connector_cleanup,
+    .reset = drm_atomic_helper_connector_reset,
+    .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+    .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+/* Bridge funcs */
+static struct sn65dsi83 *bridge_to_sn65dsi83(struct drm_bridge *bridge)
+{
+    return container_of(bridge, struct sn65dsi83, bridge);
+}
+
+static void sn65dsi83_bridge_enable(struct drm_bridge *bridge)
+{
+    struct sn65dsi83 *sn65dsi83 = bridge_to_sn65dsi83(bridge);
+    dev_info(DRM_DEVICE(bridge),"%s\n",__func__);
+    sn65dsi83->brg->funcs->setup(sn65dsi83->brg);
+    sn65dsi83->brg->funcs->start_stream(sn65dsi83->brg);
+}
+
+static void sn65dsi83_bridge_disable(struct drm_bridge *bridge)
+{
+    struct sn65dsi83 *sn65dsi83 = bridge_to_sn65dsi83(bridge);
+    dev_info(DRM_DEVICE(bridge),"%s\n",__func__);
+    sn65dsi83->brg->funcs->stop_stream(sn65dsi83->brg);
+    sn65dsi83->brg->funcs->power_off(sn65dsi83->brg);
+}
+
+static void sn65dsi83_bridge_mode_set(struct drm_bridge *bridge,
+                    struct drm_display_mode *mode,
+                    struct drm_display_mode *adj_mode)
+{
+    struct sn65dsi83 *sn65dsi83 = bridge_to_sn65dsi83(bridge);
+    dev_info(DRM_DEVICE(bridge), "%s: mode: %d*%d@%d\n",__func__,
+            mode->hdisplay,mode->vdisplay,mode->clock);
+    drm_mode_copy(&sn65dsi83->curr_mode, adj_mode);
+}
+
+static int sn65dsi83_bridge_attach(struct drm_bridge *bridge)
+{
+    struct sn65dsi83 *sn65dsi83 = bridge_to_sn65dsi83(bridge);
+    int ret;
+
+    dev_info(DRM_DEVICE(bridge),"%s\n",__func__);
+    if (!bridge->encoder) {
+        DRM_ERROR("Parent encoder object not found");
+        return -ENODEV;
+    }
+
+    sn65dsi83->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
+
+    ret = drm_connector_init(bridge->dev, &sn65dsi83->connector,
+                 &sn65dsi83_connector_funcs,
+                 DRM_MODE_CONNECTOR_DSI);
+    if (ret) {
+        DRM_ERROR("Failed to initialize connector with drm\n");
+        return ret;
+    }
+    drm_connector_helper_add(&sn65dsi83->connector,
+                 &sn65dsi83_connector_helper_funcs);
+    drm_mode_connector_attach_encoder(&sn65dsi83->connector, bridge->encoder);
+
+    ret = sn65dsi83_attach_dsi(sn65dsi83);
+
+    return ret;
+}
+
+static struct drm_bridge_funcs sn65dsi83_bridge_funcs = {
+    .enable = sn65dsi83_bridge_enable,
+    .disable = sn65dsi83_bridge_disable,
+    .mode_set = sn65dsi83_bridge_mode_set,
+    .attach = sn65dsi83_bridge_attach,
+};
+
+static int sn65dsi83_parse_dt(struct device_node *np,
+    struct sn65dsi83 *sn65dsi83)
+{
+    struct device *dev = &sn65dsi83->brg->client->dev;
+    u32 num_lanes = 2, bpp = 24, format = 2, width = 149, height = 93;
+    struct device_node *endpoint;
+
+    endpoint = of_graph_get_next_endpoint(np, NULL);
+    if (!endpoint)
+        return -ENODEV;
+
+    sn65dsi83->host_node = of_graph_get_remote_port_parent(endpoint);
+    if (!sn65dsi83->host_node) {
+        of_node_put(endpoint);
+        return -ENODEV;
+    }
+
+    of_property_read_u32(np, "ti,dsi-lanes", &num_lanes);
+    of_property_read_u32(np, "ti,lvds-format", &format);
+    of_property_read_u32(np, "ti,lvds-bpp", &bpp);
+    of_property_read_u32(np, "ti,width-mm", &width);
+    of_property_read_u32(np, "ti,height-mm", &height);
+
+    if (num_lanes < 1 || num_lanes > 4) {
+        dev_err(dev, "Invalid dsi-lanes: %d\n", num_lanes);
+        return -EINVAL;
+    }
+    sn65dsi83->brg->num_dsi_lanes = num_lanes;
+
+    sn65dsi83->brg->gpio_enable = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+    if (IS_ERR(sn65dsi83->brg->gpio_enable)) {
+        dev_err(dev, "failed to parse enable gpio");
+        return PTR_ERR(sn65dsi83->brg->gpio_enable);
+    }
+
+    sn65dsi83->brg->format = format;
+    sn65dsi83->brg->bpp = bpp;
+
+    sn65dsi83->brg->width_mm = width;
+    sn65dsi83->brg->height_mm = height;
+
+    /* Read default timing if there is not device tree node for */
+    if ((of_get_videomode(np, &sn65dsi83->brg->vm, 0)) < 0)
+        videomode_from_timing(&panel_default_timing, &sn65dsi83->brg->vm);
+
+    of_node_put(endpoint);
+    of_node_put(sn65dsi83->host_node);
+
+    return 0;
+}
+
+static int sn65dsi83_probe(struct i2c_client *i2c,
+    const struct i2c_device_id *id)
+{
+    struct sn65dsi83 *sn65dsi83;
+    struct device *dev = &i2c->dev;
+    int ret;
+
+    dev_info(dev,"%s\n",__func__);
+    if (!dev->of_node)
+        return -EINVAL;
+
+    sn65dsi83 = devm_kzalloc(dev, sizeof(*sn65dsi83), GFP_KERNEL);
+    if (!sn65dsi83)
+        return -ENOMEM;
+
+    /* Initialize it before DT parser */
+    sn65dsi83->brg = sn65dsi83_brg_get();
+    sn65dsi83->brg->client = i2c;
+
+    sn65dsi83->powered = false;
+    sn65dsi83->status = connector_status_disconnected;
+
+    i2c_set_clientdata(i2c, sn65dsi83);
+
+    ret = sn65dsi83_parse_dt(dev->of_node, sn65dsi83);
+    if (ret)
+        return ret;
+
+    sn65dsi83->brg->funcs->power_off(sn65dsi83->brg);
+    sn65dsi83->brg->funcs->power_on(sn65dsi83->brg);
+    ret  = sn65dsi83->brg->funcs->reset(sn65dsi83->brg);
+    if (ret != 0x00) {
+        dev_err(dev, "Failed to reset the device");
+        return -ENODEV;
+    }
+    sn65dsi83->brg->funcs->power_off(sn65dsi83->brg);
+
+
+    sn65dsi83->bridge.funcs = &sn65dsi83_bridge_funcs;
+    sn65dsi83->bridge.of_node = dev->of_node;
+
+    ret = drm_bridge_add(&sn65dsi83->bridge);
+    if (ret) {
+        dev_err(dev, "failed to add sn65dsi83 bridge\n");
+    }
+
+    return ret;
+}
+
+static int sn65dsi83_attach_dsi(struct sn65dsi83 *sn65dsi83)
+{
+    struct device *dev = &sn65dsi83->brg->client->dev;
+    struct mipi_dsi_host *host;
+    struct mipi_dsi_device *dsi;
+    int ret = 0;
+    const struct mipi_dsi_device_info info = { .type = "sn65dsi83",
+                           .channel = 0,
+                           .node = NULL,
+                         };
+
+    dev_info(dev, "%s\n",__func__);
+    host = of_find_mipi_dsi_host_by_node(sn65dsi83->host_node);
+    if (!host) {
+        dev_err(dev, "failed to find dsi host\n");
+        return -EPROBE_DEFER;
+    }
+
+    dsi = mipi_dsi_device_register_full(host, &info);
+    if (IS_ERR(dsi)) {
+        dev_err(dev, "failed to create dsi device\n");
+        ret = PTR_ERR(dsi);
+        return -ENODEV;
+    }
+
+    sn65dsi83->dsi = dsi;
+
+    dsi->lanes = sn65dsi83->brg->num_dsi_lanes;
+    dsi->format = MIPI_DSI_FMT_RGB888;
+    dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+
+    ret = mipi_dsi_attach(dsi);
+    if (ret < 0) {
+        dev_err(dev, "failed to attach dsi to host\n");
+        mipi_dsi_device_unregister(dsi);
+    }
+
+    return ret;
+}
+
+static void sn65dsi83_detach_dsi(struct sn65dsi83 *sn65dsi83)
+{
+    struct device *dev = &sn65dsi83->brg->client->dev;
+    dev_info(dev, "%s\n",__func__);
+    mipi_dsi_detach(sn65dsi83->dsi);
+    mipi_dsi_device_unregister(sn65dsi83->dsi);
+}
+
+static int sn65dsi83_remove(struct i2c_client *i2c)
+{
+    struct sn65dsi83 *sn65dsi83 = i2c_get_clientdata(i2c);
+    struct device *dev = &sn65dsi83->brg->client->dev;
+    dev_info(dev, "%s\n",__func__);
+
+    sn65dsi83_detach_dsi(sn65dsi83);
+    drm_bridge_remove(&sn65dsi83->bridge);
+
+    return 0;
+}
+
+static const struct i2c_device_id sn65dsi83_i2c_ids[] = {
+    { "sn65dsi83", 0 },
+    { }
+};
+MODULE_DEVICE_TABLE(i2c, sn65dsi83_i2c_ids);
+
+static const struct of_device_id sn65dsi83_of_ids[] = {
+    { .compatible = "ti,sn65dsi83" },
+    { }
+};
+MODULE_DEVICE_TABLE(of, sn65dsi83_of_ids);
+
+static struct mipi_dsi_driver sn65dsi83_dsi_driver = {
+    .driver.name = "sn65dsi83",
+};
+
+static struct i2c_driver sn65dsi83_driver = {
+    .driver = {
+        .name = "sn65dsi83",
+        .of_match_table = sn65dsi83_of_ids,
+    },
+    .id_table = sn65dsi83_i2c_ids,
+    .probe = sn65dsi83_probe,
+    .remove = sn65dsi83_remove,
+};
+
+static int __init sn65dsi83_init(void)
+{
+    if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
+        mipi_dsi_driver_register(&sn65dsi83_dsi_driver);
+
+    return i2c_add_driver(&sn65dsi83_driver);
+}
+module_init(sn65dsi83_init);
+
+static void __exit sn65dsi83_exit(void)
+{
+    i2c_del_driver(&sn65dsi83_driver);
+
+    if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
+        mipi_dsi_driver_unregister(&sn65dsi83_dsi_driver);
+}
+module_exit(sn65dsi83_exit);
+
+MODULE_AUTHOR("CompuLab <compulab@compula.co.il>");
+MODULE_DESCRIPTION("SN65DSI bridge driver");
+MODULE_LICENSE("GPL");
-- 
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