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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Diiver for panels based on Himax HX8394 controller
- * Copyright (c) 2023, Alibaba-inc Co., Ltd
- *
- */
- #include <linux/delay.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/of_device.h>
- #include <linux/gpio/consumer.h>
- #include <linux/regulator/consumer.h>
- #include <drm/drm_device.h>
- #include <drm/drm_mipi_dsi.h>
- #include <drm/drm_modes.h>
- #include <drm/drm_panel.h>
- #include <video/mipi_display.h>
- struct hx8394_panel_cmd {
- char cmdlen;
- char cmddata[0x40];
- };
- struct hx8394_panel_desc {
- const struct drm_display_mode *display_mode;
- unsigned long mode_flags;
- enum mipi_dsi_pixel_format format;
- unsigned int lanes;
- const struct hx8394_panel_cmd *on_cmds;
- unsigned int on_cmds_num;
- };
- struct panel_info {
- struct drm_panel base;
- struct mipi_dsi_device *link;
- const struct hx8394_panel_desc *desc;
- struct gpio_desc *reset;
- struct regulator *hsvcc;
- struct regulator *vspn3v3;
- bool prepared;
- bool enabled;
- };
- static inline struct panel_info *to_panel_info(struct drm_panel *panel)
- {
- return container_of(panel, struct panel_info, base);
- }
- static int hx8394_send_mipi_cmds(struct drm_panel *panel, const struct hx8394_panel_cmd *cmds)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- unsigned int i = 0;
- int err;
- for (i = 0; i < pinfo->desc->on_cmds_num; i++) {
- err = mipi_dsi_dcs_write_buffer(pinfo->link, &(cmds[i].cmddata[0]), cmds[i].cmdlen);
- if (err < 0)
- return err;
- }
- return 0;
- }
- static int hx8394_panel_disable(struct drm_panel *panel)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- int err;
- if (!pinfo->enabled)
- return 0;
- err = mipi_dsi_dcs_set_display_off(pinfo->link);
- if (err < 0) {
- dev_err(panel->dev, "failed to set display off: %d\n", err);
- return err;
- }
- pinfo->enabled = false;
- return 0;
- }
- static int hx8394_panel_unprepare(struct drm_panel *panel)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- int err;
- if (!pinfo->prepared)
- return 0;
- err = mipi_dsi_dcs_set_display_off(pinfo->link);
- if (err < 0)
- dev_err(panel->dev, "failed to set display off: %d\n", err);
- err = mipi_dsi_dcs_enter_sleep_mode(pinfo->link);
- if (err < 0)
- dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);
- /* sleep_mode_delay: 1ms - 2ms */
- usleep_range(1000, 2000);
- gpiod_set_value(pinfo->reset, 1);
- regulator_disable(pinfo->hsvcc);
- regulator_disable(pinfo->vspn3v3);
- pinfo->prepared = false;
- return 0;
- }
- static int hx8394_panel_prepare(struct drm_panel *panel)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- int ret;
- if (pinfo->prepared)
- return 0;
- gpiod_set_value(pinfo->reset, 1);
- /* Power the panel */
- ret = regulator_enable(pinfo->hsvcc);
- if (ret) {
- dev_err(pinfo->base.dev, "Failed to enable hsvcc supply: %d\n", ret);
- return ret;
- }
- usleep_range(1000, 2000);
- ret = regulator_enable(pinfo->vspn3v3);
- if (ret) {
- dev_err(pinfo->base.dev, "Failed to enable vspn3v3 supply: %d\n", ret);
- goto fail;
- }
- usleep_range(5000, 6000);
- gpiod_set_value(pinfo->reset, 0);
- msleep(180);
- pinfo->prepared = true;
- return 0;
- fail:
- gpiod_set_value(pinfo->reset, 1);
- regulator_disable(pinfo->hsvcc);
- return ret;
- }
- static int hx8394_read_id(struct mipi_dsi_device *dsi, u8 *id1)
- {
- int ret;
- ret = mipi_dsi_dcs_read(dsi, 0xDA, id1, 1);
- if (ret < 0) {
- dev_err(&dsi->dev, "could not read ID1\n");
- return ret;
- }
- dev_info(&dsi->dev, "ID1 : 0x%02x\n", *id1);
- return 0;
- }
- static int hx8394_panel_enable(struct drm_panel *panel)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- int ret;
- u8 id1;
- if (pinfo->enabled)
- return 0;
- ret = hx8394_read_id(pinfo->link, &id1);
- if (ret < 0)
- dev_info(panel->dev, "No LCD connected,pls check your hardware! ret:%d\n", ret);
- /* send init code */
- ret = hx8394_send_mipi_cmds(panel, pinfo->desc->on_cmds);
- if (ret < 0) {
- dev_err(panel->dev, "failed to send DCS Init Code: %d\n", ret);
- return ret;
- }
- ret = mipi_dsi_dcs_exit_sleep_mode(pinfo->link);
- if (ret < 0) {
- dev_err(panel->dev, "failed to exit sleep mode: %d\n", ret);
- return ret;
- }
- msleep(120);
- ret = mipi_dsi_dcs_set_display_on(pinfo->link);
- if (ret < 0) {
- dev_err(panel->dev, "failed to set display on: %d\n", ret);
- return ret;
- }
- pinfo->enabled = true;
- return 0;
- }
- static int hx8394_panel_get_modes(struct drm_panel *panel,
- struct drm_connector *connector)
- {
- struct panel_info *pinfo = to_panel_info(panel);
- const struct drm_display_mode *m = pinfo->desc->display_mode;
- struct drm_display_mode *mode;
- mode = drm_mode_duplicate(connector->dev, m);
- if (!mode) {
- dev_err(pinfo->base.dev, "failed to add mode %ux%u@%u\n",
- m->hdisplay, m->vdisplay, drm_mode_vrefresh(m));
- return -ENOMEM;
- }
- drm_mode_set_name(mode);
- mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- drm_mode_probed_add(connector, mode);
- connector->display_info.width_mm = mode->width_mm;
- connector->display_info.height_mm = mode->height_mm;
- return 1;
- }
- static const struct drm_panel_funcs panel_funcs = {
- .disable = hx8394_panel_disable,
- .unprepare = hx8394_panel_unprepare,
- .prepare = hx8394_panel_prepare,
- .enable = hx8394_panel_enable,
- .get_modes = hx8394_panel_get_modes,
- };
- static const struct drm_display_mode hx8394_default_mode = {
- .clock = 76000,
- .hdisplay = 720,
- .hsync_start = 720 + 45,
- .hsync_end = 720 + 45 + 8,
- .htotal = 720 + 45 + 8 + 45,
- .vdisplay = 1280,
- .vsync_start = 1280 + 16,
- .vsync_end = 1280 + 16 + 8,
- .vtotal = 1280 + 16 + 8 + 16,
- .width_mm = 62,
- .height_mm = 110,
- .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
- };
- static const struct hx8394_panel_cmd hx8394_on_cmds[] = {
- { .cmdlen = 4, .cmddata = {0xB9, 0xFF, 0x83, 0x94} },
- { .cmdlen = 11, .cmddata = {0xB1, 0x48, 0x0A, 0x6A, 0x09, 0x33, 0x54,
- 0x71, 0x71, 0x2E, 0x45} },
- { .cmdlen = 7, .cmddata = {0xBA, 0x63, 0x03, 0x68, 0x6B, 0xB2, 0xC0} },
- { .cmdlen = 7, .cmddata = {0xB2, 0x00, 0x80, 0x64, 0x0C, 0x06, 0x2F} },
- { .cmdlen = 22, .cmddata = {0xB4, 0x1C, 0x78, 0x1C, 0x78, 0x1C, 0x78, 0x01,
- 0x0C, 0x86, 0x75, 0x00, 0x3F, 0x1C, 0x78, 0x1C,
- 0x78, 0x1C, 0x78, 0x01, 0x0C, 0x86} },
- { .cmdlen = 34, .cmddata = {0xD3, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x08,
- 0x08, 0x32, 0x10, 0x05, 0x00, 0x05, 0x32, 0x13,
- 0xC1, 0x00, 0x01, 0x32, 0x10, 0x08, 0x00, 0x00,
- 0x37, 0x03, 0x07, 0x07, 0x37, 0x05, 0x05, 0x37,
- 0x0C, 0x40} },
- { .cmdlen = 45, .cmddata = {0xD5, 0x18, 0x18, 0x18, 0x18, 0x22, 0x23, 0x20,
- 0x21, 0x04, 0x05, 0x06, 0x07, 0x00, 0x01, 0x02,
- 0x03, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x19, 0x19, 0x19, 0x19} },
- { .cmdlen = 45, .cmddata = {0xD6, 0x18, 0x18, 0x19, 0x19, 0x21, 0x20, 0x23,
- 0x22, 0x03, 0x02, 0x01, 0x00, 0x07, 0x06, 0x05,
- 0x04, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18, 0x18,
- 0x18, 0x19, 0x19, 0x18, 0x18} },
- { .cmdlen = 59, .cmddata = {0xE0, 0x07, 0x08, 0x09, 0x0D, 0x10, 0x14, 0x16,
- 0x13, 0x24, 0x36, 0x48, 0x4A, 0x58, 0x6F, 0x76,
- 0x80, 0x97, 0xA5, 0xA8, 0xB5, 0xC6, 0x62, 0x63,
- 0x68, 0x6F, 0x72, 0x78, 0x7F, 0x7F, 0x00, 0x02,
- 0x08, 0x0D, 0x0C, 0x0E, 0x0F, 0x10, 0x24, 0x36,
- 0x48, 0x4A, 0x58, 0x6F, 0x78, 0x82, 0x99, 0xA4,
- 0xA0, 0xB1, 0xC0, 0x5E, 0x5E, 0x64, 0x6B, 0x6C,
- 0x73, 0x7F, 0x7F} },
- { .cmdlen = 2, .cmddata = {0xCC, 0x03} },
- { .cmdlen = 3, .cmddata = {0xC0, 0x1F, 0x73} },
- { .cmdlen = 3, .cmddata = {0xB6, 0x90, 0x90} },
- { .cmdlen = 2, .cmddata = {0xD4, 0x02} },
- { .cmdlen = 2, .cmddata = {0xBD, 0x01} },
- { .cmdlen = 2, .cmddata = {0xB1, 0x00} },
- { .cmdlen = 2, .cmddata = {0xBD, 0x00} },
- { .cmdlen = 8, .cmddata = {0xBF, 0x40, 0x81, 0x50, 0x00, 0x1A, 0xFC, 0x01} },
- { .cmdlen = 2, .cmddata = {0x36, 0x02} },
- };
- static const struct hx8394_panel_desc hx8394_desc = {
- .display_mode = &hx8394_default_mode,
- .mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM | MIPI_DSI_MODE_VIDEO_BURST,
- .format = MIPI_DSI_FMT_RGB888,
- .lanes = 4,
- .on_cmds = hx8394_on_cmds,
- .on_cmds_num = ARRAY_SIZE(hx8394_on_cmds),
- };
- static const struct of_device_id panel_of_match[] = {
- {
- .compatible = "himax,hx8394",
- .data = &hx8394_desc,
- },
- {
- /* sentinel */
- }
- };
- MODULE_DEVICE_TABLE(of, panel_of_match);
- static int hx8394_panel_add(struct panel_info *pinfo)
- {
- struct device *dev = &pinfo->link->dev;
- int ret;
- pinfo->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
- if (IS_ERR(pinfo->reset))
- return dev_err_probe(dev, PTR_ERR(pinfo->reset),
- "Couldn't get our reset GPIO\n");
- pinfo->hsvcc = devm_regulator_get(dev, "hsvcc");
- if (IS_ERR(pinfo->hsvcc))
- return dev_err_probe(dev, PTR_ERR(pinfo->hsvcc),
- "Failed to request hsvcc regulator\n");
- pinfo->vspn3v3 = devm_regulator_get(dev, "vspn3v3");
- if (IS_ERR(pinfo->vspn3v3))
- return dev_err_probe(dev, PTR_ERR(pinfo->vspn3v3),
- "Failed to request vspn3v3 regulator\n");
- drm_panel_init(&pinfo->base, dev, &panel_funcs,
- DRM_MODE_CONNECTOR_DSI);
- ret = drm_panel_of_backlight(&pinfo->base);
- if (ret)
- return ret;
- drm_panel_add(&pinfo->base);
- return 0;
- }
- static int hx8394_panel_probe(struct mipi_dsi_device *dsi)
- {
- struct panel_info *pinfo;
- const struct hx8394_panel_desc *desc;
- int err;
- pinfo = devm_kzalloc(&dsi->dev, sizeof(*pinfo), GFP_KERNEL);
- if (!pinfo)
- return -ENOMEM;
- desc = of_device_get_match_data(&dsi->dev);
- dsi->mode_flags = desc->mode_flags;
- dsi->format = desc->format;
- dsi->lanes = desc->lanes;
- pinfo->desc = desc;
- pinfo->link = dsi;
- mipi_dsi_set_drvdata(dsi, pinfo);
- err = hx8394_panel_add(pinfo);
- if (err < 0)
- return err;
- err = mipi_dsi_attach(dsi);
- if (err < 0)
- drm_panel_remove(&pinfo->base);
- return err;
- }
- static int hx8394_panel_remove(struct mipi_dsi_device *dsi)
- {
- struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
- int err;
- err = hx8394_panel_disable(&pinfo->base);
- if (err < 0)
- dev_err(&dsi->dev, "failed to disable panel: %d\n", err);
- err = hx8394_panel_unprepare(&pinfo->base);
- if (err < 0)
- dev_err(&dsi->dev, "failed to unprepare panel: %d\n", err);
- err = mipi_dsi_detach(dsi);
- if (err < 0)
- dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);
- drm_panel_remove(&pinfo->base);
- return 0;
- }
- static void hx8394_panel_shutdown(struct mipi_dsi_device *dsi)
- {
- struct panel_info *pinfo = mipi_dsi_get_drvdata(dsi);
- hx8394_panel_disable(&pinfo->base);
- hx8394_panel_unprepare(&pinfo->base);
- }
- static struct mipi_dsi_driver panel_driver = {
- .driver = {
- .name = "panel-himax8394",
- .of_match_table = panel_of_match,
- },
- .probe = hx8394_panel_probe,
- .remove = hx8394_panel_remove,
- .shutdown = hx8394_panel_shutdown,
- };
- module_mipi_dsi_driver(panel_driver);
- MODULE_DESCRIPTION("Himax8394 driver");
- MODULE_LICENSE("GPL v2");
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