--- /dev/null
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 RenewOutReach
+ * Copyright (C) 2021 Amarula Solutions(India)
+ *
+ * Author:
+ * Jagan Teki <jagan@amarulasolutions.com>
+ * Christopher Vollo <chris@renewoutreach.org>
+ */
+
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_of.h>
+#include <drm/drm_print.h>
+#include <drm/drm_mipi_dsi.h>
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+enum cmd_registers {
+ WR_INPUT_SOURCE = 0x05, /* Write Input Source Select */
+ WR_EXT_SOURCE_FMT = 0x07, /* Write External Video Source Format */
+ WR_IMAGE_CROP = 0x10, /* Write Image Crop */
+ WR_DISPLAY_SIZE = 0x12, /* Write Display Size */
+ WR_IMAGE_FREEZE = 0x1A, /* Write Image Freeze */
+ WR_INPUT_IMAGE_SIZE = 0x2E, /* Write External Input Image Size */
+ WR_RGB_LED_EN = 0x52, /* Write RGB LED Enable */
+ WR_RGB_LED_CURRENT = 0x54, /* Write RGB LED Current */
+ WR_RGB_LED_MAX_CURRENT = 0x5C, /* Write RGB LED Max Current */
+ WR_DSI_HS_CLK = 0xBD, /* Write DSI HS Clock */
+ RD_DEVICE_ID = 0xD4, /* Read Controller Device ID */
+ WR_DSI_PORT_EN = 0xD7, /* Write DSI Port Enable */
+};
+
+enum input_source {
+ INPUT_EXTERNAL_VIDEO = 0,
+ INPUT_TEST_PATTERN,
+ INPUT_SPLASH_SCREEN,
+};
+
+#define DEV_ID_MASK GENMASK(3, 0)
+#define IMAGE_FREESE_EN BIT(0)
+#define DSI_PORT_EN 0
+#define EXT_SOURCE_FMT_DSI 0
+#define RED_LED_EN BIT(0)
+#define GREEN_LED_EN BIT(1)
+#define BLUE_LED_EN BIT(2)
+#define LED_MASK GENMASK(2, 0)
+#define MAX_BYTE_SIZE 8
+
+struct dlpc {
+ struct device *dev;
+ struct drm_bridge bridge;
+ struct drm_bridge *next_bridge;
+ struct device_node *host_node;
+ struct mipi_dsi_device *dsi;
+ struct drm_display_mode mode;
+
+ struct gpio_desc *enable_gpio;
+ struct regulator *vcc_intf;
+ struct regulator *vcc_flsh;
+ struct regmap *regmap;
+ unsigned int dsi_lanes;
+};
+
+static inline struct dlpc *bridge_to_dlpc(struct drm_bridge *bridge)
+{
+ return container_of(bridge, struct dlpc, bridge);
+}
+
+static bool dlpc_writeable_noinc_reg(struct device *dev, unsigned int reg)
+{
+ switch (reg) {
+ case WR_IMAGE_CROP:
+ case WR_DISPLAY_SIZE:
+ case WR_INPUT_IMAGE_SIZE:
+ case WR_DSI_HS_CLK:
+ return true;
+ default:
+ return false;
+ }
+}
+
+static const struct regmap_range dlpc_volatile_ranges[] = {
+ { .range_min = 0x10, .range_max = 0xBF },
+};
+
+static const struct regmap_access_table dlpc_volatile_table = {
+ .yes_ranges = dlpc_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(dlpc_volatile_ranges),
+};
+
+static struct regmap_config dlpc_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = WR_DSI_PORT_EN,
+ .writeable_noinc_reg = dlpc_writeable_noinc_reg,
+ .volatile_table = &dlpc_volatile_table,
+ .cache_type = REGCACHE_RBTREE,
+ .name = "dlpc3433",
+};
+
+static void dlpc_atomic_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct dlpc *dlpc = bridge_to_dlpc(bridge);
+ struct device *dev = dlpc->dev;
+ struct drm_display_mode *mode = &dlpc->mode;
+ struct regmap *regmap = dlpc->regmap;
+ char buf[MAX_BYTE_SIZE];
+ unsigned int devid;
+
+ regmap_read(regmap, RD_DEVICE_ID, &devid);
+ devid &= DEV_ID_MASK;
+
+ DRM_DEV_DEBUG(dev, "DLPC3433 device id: 0x%02x\n", devid);
+
+ if (devid != 0x01) {
+ DRM_DEV_ERROR(dev, "Unsupported DLPC device id: 0x%02x\n", devid);
+ return;
+ }
+
+ /* disable image freeze */
+ regmap_write(regmap, WR_IMAGE_FREEZE, IMAGE_FREESE_EN);
+
+ /* enable DSI port */
+ regmap_write(regmap, WR_DSI_PORT_EN, DSI_PORT_EN);
+
+ memset(buf, 0, MAX_BYTE_SIZE);
+
+ /* set image crop */
+ buf[4] = mode->hdisplay & 0xff;
+ buf[5] = (mode->hdisplay & 0xff00) >> 8;
+ buf[6] = mode->vdisplay & 0xff;
+ buf[7] = (mode->vdisplay & 0xff00) >> 8;
+ regmap_noinc_write(regmap, WR_IMAGE_CROP, buf, MAX_BYTE_SIZE);
+
+ /* set display size */
+ buf[4] = mode->hdisplay & 0xff;
+ buf[5] = (mode->hdisplay & 0xff00) >> 8;
+ buf[6] = mode->vdisplay & 0xff;
+ buf[7] = (mode->vdisplay & 0xff00) >> 8;
+ regmap_noinc_write(regmap, WR_DISPLAY_SIZE, buf, MAX_BYTE_SIZE);
+
+ /* set input image size */
+ buf[0] = mode->hdisplay & 0xff;
+ buf[1] = (mode->hdisplay & 0xff00) >> 8;
+ buf[2] = mode->vdisplay & 0xff;
+ buf[3] = (mode->vdisplay & 0xff00) >> 8;
+ regmap_noinc_write(regmap, WR_INPUT_IMAGE_SIZE, buf, 4);
+
+ /* set external video port */
+ regmap_write(regmap, WR_INPUT_SOURCE, INPUT_EXTERNAL_VIDEO);
+
+ /* set external video format select as DSI */
+ regmap_write(regmap, WR_EXT_SOURCE_FMT, EXT_SOURCE_FMT_DSI);
+
+ /* disable image freeze */
+ regmap_write(regmap, WR_IMAGE_FREEZE, 0x00);
+
+ /* enable RGB led */
+ regmap_update_bits(regmap, WR_RGB_LED_EN, LED_MASK,
+ RED_LED_EN | GREEN_LED_EN | BLUE_LED_EN);
+
+ msleep(10);
+}
+
+static void dlpc_atomic_pre_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct dlpc *dlpc = bridge_to_dlpc(bridge);
+ int ret;
+
+ gpiod_set_value(dlpc->enable_gpio, 1);
+
+ msleep(500);
+
+ ret = regulator_enable(dlpc->vcc_intf);
+ if (ret)
+ DRM_DEV_ERROR(dlpc->dev,
+ "failed to enable VCC_INTF regulator: %d\n", ret);
+
+ ret = regulator_enable(dlpc->vcc_flsh);
+ if (ret)
+ DRM_DEV_ERROR(dlpc->dev,
+ "failed to enable VCC_FLSH regulator: %d\n", ret);
+
+ msleep(10);
+}
+
+static void dlpc_atomic_post_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
+{
+ struct dlpc *dlpc = bridge_to_dlpc(bridge);
+
+ regulator_disable(dlpc->vcc_flsh);
+ regulator_disable(dlpc->vcc_intf);
+
+ msleep(10);
+
+ gpiod_set_value(dlpc->enable_gpio, 0);
+
+ msleep(500);
+}
+
+#define MAX_INPUT_SEL_FORMATS 1
+
+static u32 *
+dlpc_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state,
+ u32 output_fmt,
+ unsigned int *num_input_fmts)
+{
+ u32 *input_fmts;
+
+ *num_input_fmts = 0;
+
+ input_fmts = kcalloc(MAX_INPUT_SEL_FORMATS, sizeof(*input_fmts),
+ GFP_KERNEL);
+ if (!input_fmts)
+ return NULL;
+
+ /* This is the DSI-end bus format */
+ input_fmts[0] = MEDIA_BUS_FMT_RGB888_1X24;
+ *num_input_fmts = 1;
+
+ return input_fmts;
+}
+
+static void dlpc_mode_set(struct drm_bridge *bridge,
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
+{
+ struct dlpc *dlpc = bridge_to_dlpc(bridge);
+
+ drm_mode_copy(&dlpc->mode, adjusted_mode);
+}
+
+static int dlpc_attach(struct drm_bridge *bridge,
+ enum drm_bridge_attach_flags flags)
+{
+ struct dlpc *dlpc = bridge_to_dlpc(bridge);
+
+ return drm_bridge_attach(bridge->encoder, dlpc->next_bridge, bridge, flags);
+}
+
+static const struct drm_bridge_funcs dlpc_bridge_funcs = {
+ .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
+ .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
+ .atomic_get_input_bus_fmts = dlpc_atomic_get_input_bus_fmts,
+ .atomic_reset = drm_atomic_helper_bridge_reset,
+ .atomic_pre_enable = dlpc_atomic_pre_enable,
+ .atomic_enable = dlpc_atomic_enable,
+ .atomic_post_disable = dlpc_atomic_post_disable,
+ .mode_set = dlpc_mode_set,
+ .attach = dlpc_attach,
+};
+
+static int dlpc3433_parse_dt(struct dlpc *dlpc)
+{
+ struct device *dev = dlpc->dev;
+ struct device_node *endpoint;
+ int ret;
+
+ dlpc->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW);
+ if (IS_ERR(dlpc->enable_gpio))
+ return PTR_ERR(dlpc->enable_gpio);
+
+ dlpc->vcc_intf = devm_regulator_get(dlpc->dev, "vcc_intf");
+ if (IS_ERR(dlpc->vcc_intf))
+ return dev_err_probe(dev, PTR_ERR(dlpc->vcc_intf),
+ "failed to get VCC_INTF supply\n");
+
+ dlpc->vcc_flsh = devm_regulator_get(dlpc->dev, "vcc_flsh");
+ if (IS_ERR(dlpc->vcc_flsh))
+ return dev_err_probe(dev, PTR_ERR(dlpc->vcc_flsh),
+ "failed to get VCC_FLSH supply\n");
+
+ dlpc->next_bridge = devm_drm_of_get_bridge(dev, dev->of_node, 1, 0);
+ if (IS_ERR(dlpc->next_bridge))
+ return PTR_ERR(dlpc->next_bridge);
+
+ endpoint = of_graph_get_endpoint_by_regs(dev->of_node, 0, 0);
+ dlpc->dsi_lanes = of_property_count_u32_elems(endpoint, "data-lanes");
+ if (dlpc->dsi_lanes < 0 || dlpc->dsi_lanes > 4) {
+ ret = -EINVAL;
+ goto err_put_endpoint;
+ }
+
+ dlpc->host_node = of_graph_get_remote_port_parent(endpoint);
+ if (!dlpc->host_node) {
+ ret = -ENODEV;
+ goto err_put_host;
+ }
+
+ of_node_put(endpoint);
+
+ return 0;
+
+err_put_host:
+ of_node_put(dlpc->host_node);
+err_put_endpoint:
+ of_node_put(endpoint);
+ return ret;
+}
+
+static int dlpc_host_attach(struct dlpc *dlpc)
+{
+ struct device *dev = dlpc->dev;
+ struct mipi_dsi_host *host;
+ struct mipi_dsi_device_info info = {
+ .type = "dlpc3433",
+ .channel = 0,
+ .node = NULL,
+ };
+
+ host = of_find_mipi_dsi_host_by_node(dlpc->host_node);
+ if (!host) {
+ DRM_DEV_ERROR(dev, "failed to find dsi host\n");
+ return -EPROBE_DEFER;
+ }
+
+ dlpc->dsi = mipi_dsi_device_register_full(host, &info);
+ if (IS_ERR(dlpc->dsi)) {
+ DRM_DEV_ERROR(dev, "failed to create dsi device\n");
+ return PTR_ERR(dlpc->dsi);
+ }
+
+ dlpc->dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST;
+ dlpc->dsi->format = MIPI_DSI_FMT_RGB565;
+ dlpc->dsi->lanes = dlpc->dsi_lanes;
+
+ return devm_mipi_dsi_attach(dev, dlpc->dsi);
+}
+
+static int dlpc3433_probe(struct i2c_client *client)
+{
+ struct device *dev = &client->dev;
+ struct dlpc *dlpc;
+ int ret;
+
+ dlpc = devm_kzalloc(dev, sizeof(*dlpc), GFP_KERNEL);
+ if (!dlpc)
+ return -ENOMEM;
+
+ dlpc->dev = dev;
+
+ dlpc->regmap = devm_regmap_init_i2c(client, &dlpc_regmap_config);
+ if (IS_ERR(dlpc->regmap))
+ return PTR_ERR(dlpc->regmap);
+
+ ret = dlpc3433_parse_dt(dlpc);
+ if (ret)
+ return ret;
+
+ dev_set_drvdata(dev, dlpc);
+ i2c_set_clientdata(client, dlpc);
+
+ dlpc->bridge.funcs = &dlpc_bridge_funcs;
+ dlpc->bridge.of_node = dev->of_node;
+ drm_bridge_add(&dlpc->bridge);
+
+ ret = dlpc_host_attach(dlpc);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to attach dsi host\n");
+ goto err_remove_bridge;
+ }
+
+ return 0;
+
+err_remove_bridge:
+ drm_bridge_remove(&dlpc->bridge);
+ return ret;
+}
+
+static int dlpc3433_remove(struct i2c_client *client)
+{
+ struct dlpc *dlpc = i2c_get_clientdata(client);
+
+ drm_bridge_remove(&dlpc->bridge);
+ of_node_put(dlpc->host_node);
+
+ return 0;
+}
+
+static const struct i2c_device_id dlpc3433_id[] = {
+ { "ti,dlpc3433", 0 },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(i2c, dlpc3433_id);
+
+static const struct of_device_id dlpc3433_match_table[] = {
+ { .compatible = "ti,dlpc3433" },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dlpc3433_match_table);
+
+static struct i2c_driver dlpc3433_driver = {
+ .probe_new = dlpc3433_probe,
+ .remove = dlpc3433_remove,
+ .id_table = dlpc3433_id,
+ .driver = {
+ .name = "ti-dlpc3433",
+ .of_match_table = dlpc3433_match_table,
+ },
+};
+module_i2c_driver(dlpc3433_driver);
+
+MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
+MODULE_AUTHOR("Christopher Vollo <chris@renewoutreach.org>");
+MODULE_DESCRIPTION("TI DLPC3433 MIPI DSI Display Controller Bridge");
+MODULE_LICENSE("GPL");
projects / kernel.git / commitdiff