The JDI LPM102A188A is a 2560x1800 IPS panel found in the Google Pixel C. This driver is based on the downstream GPLv2 driver released by Google written by Sean Paul [1], which was then adapted to the newer kernel APIs.
[1]: https://android.googlesource.com/kernel/tegra/+/refs/heads/android-tegra-dragon-3.18-oreo/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c Signed-off-by: Diogo Ivo <diogo....@tecnico.ulisboa.pt> --- Changes in v2: - tuned backlight delays drivers/gpu/drm/panel/Kconfig | 11 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c | 509 ++++++++++++++++++ 3 files changed, 521 insertions(+) create mode 100644 drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index a582ddd583c2..80eda8f6bee0 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -214,6 +214,17 @@ config DRM_PANEL_JDI_LT070ME05000 The panel has a 1200(RGB)×1920 (WUXGA) resolution and uses 24 bit per pixel. +config DRM_PANEL_JDI_LPM102A188A + tristate "JDI LPM102A188A DSI panel" + depends on OF && GPIOLIB + depends on DRM_MIPI_DSI + depends on BACKLIGHT_CLASS_DEVICE + help + Say Y here if you want to enable support for JDI LPM102A188A DSI + control mode panel as found in Google Pixel C devices. + The panel has a 2560×1800 resolution. It provides a MIPI DSI interface + to the host. + config DRM_PANEL_JDI_R63452 tristate "JDI R63452 Full HD DSI panel" depends on OF diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index 34e717382dbb..2870cba96d14 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o obj-$(CONFIG_DRM_PANEL_INNOLUX_EJ030NA) += panel-innolux-ej030na.o obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o +obj-$(CONFIG_DRM_PANEL_JDI_LPM102A188A) += panel-jdi-lpm102a188a.o obj-$(CONFIG_DRM_PANEL_JDI_R63452) += panel-jdi-fhd-r63452.o obj-$(CONFIG_DRM_PANEL_KHADAS_TS050) += panel-khadas-ts050.o obj-$(CONFIG_DRM_PANEL_KINGDISPLAY_KD097D04) += panel-kingdisplay-kd097d04.o diff --git a/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c b/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c new file mode 100644 index 000000000000..980af82ad6d6 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-jdi-lpm102a188a.c @@ -0,0 +1,509 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2014 Google, Inc. + * + * Copyright (C) 2022 Diogo Ivo <diogo....@tecnico.ulisboa.pt> + * + * Adapted from the downstream Pixel C driver written by Sean Paul + */ + +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/regulator/consumer.h> + +#include <video/mipi_display.h> + +#include <drm/drm_crtc.h> +#include <drm/drm_mipi_dsi.h> +#include <drm/drm_panel.h> + +struct jdi_panel { + struct drm_panel base; + struct mipi_dsi_device *link1; + struct mipi_dsi_device *link2; + + struct regulator *supply; + struct regulator *ddi_supply; + struct backlight_device *backlight; + + struct gpio_desc *enable_gpio; + struct gpio_desc *reset_gpio; + + const struct drm_display_mode *mode; + + bool prepared; + bool enabled; +}; + +static inline struct jdi_panel *to_panel_jdi(struct drm_panel *panel) +{ + return container_of(panel, struct jdi_panel, base); +} + +static void jdi_wait_frames(struct jdi_panel *jdi, unsigned int frames) +{ + unsigned int refresh = drm_mode_vrefresh(jdi->mode); + + if (WARN_ON(frames > refresh)) + return; + + msleep(1000 / (refresh / frames)); +} + +static int jdi_panel_disable(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_panel_jdi(panel); + + if (!jdi->enabled) + return 0; + + backlight_disable(jdi->backlight); + + jdi_wait_frames(jdi, 2); + + jdi->enabled = false; + + return 0; +} + +static int jdi_panel_unprepare(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_panel_jdi(panel); + int ret; + + if (!jdi->prepared) + return 0; + + ret = mipi_dsi_dcs_set_display_off(jdi->link1); + if (ret < 0) + dev_err(panel->dev, "failed to set display off: %d\n", ret); + ret = mipi_dsi_dcs_set_display_off(jdi->link2); + if (ret < 0) + dev_err(panel->dev, "failed to set display off: %d\n", ret); + + /* Specified by JDI @ 50ms, subject to change */ + msleep(50); + + ret = mipi_dsi_dcs_enter_sleep_mode(jdi->link1); + if (ret < 0) + dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret); + ret = mipi_dsi_dcs_enter_sleep_mode(jdi->link2); + if (ret < 0) + dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret); + + /* Specified by JDI @ 150ms, subject to change */ + msleep(150); + + gpiod_set_value(jdi->reset_gpio, 1); + + /* T4 = 1ms */ + usleep_range(1000, 3000); + + gpiod_set_value(jdi->enable_gpio, 0); + + /* T5 = 2ms */ + usleep_range(2000, 4000); + + regulator_disable(jdi->ddi_supply); + + /* T6 = 2ms */ + usleep_range(5000, 6000); + + regulator_disable(jdi->supply); + + jdi->prepared = false; + + return 0; +} + +static int jdi_setup_symmetrical_split(struct mipi_dsi_device *left, + struct mipi_dsi_device *right, + const struct drm_display_mode *mode) +{ + int err; + + err = mipi_dsi_dcs_set_column_address(left, 0, mode->hdisplay / 2 - 1); + if (err < 0) { + dev_err(&left->dev, "failed to set column address: %d\n", err); + return err; + } + + err = mipi_dsi_dcs_set_column_address(right, 0, mode->hdisplay / 2 - 1); + if (err < 0) { + dev_err(&right->dev, "failed to set column address: %d\n", err); + return err; + } + + err = mipi_dsi_dcs_set_page_address(left, 0, mode->vdisplay - 1); + if (err < 0) { + dev_err(&left->dev, "failed to set page address: %d\n", err); + return err; + } + + err = mipi_dsi_dcs_set_page_address(right, 0, mode->vdisplay - 1); + if (err < 0) { + dev_err(&right->dev, "failed to set page address: %d\n", err); + return err; + } + + return 0; +} + +static int jdi_panel_prepare(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_panel_jdi(panel); + u8 format = MIPI_DCS_PIXEL_FMT_24BIT; + int err; + + if (jdi->prepared) + return 0; + + /* Disable backlight to avoid showing random pixels + * with a conservative delay for it to take effect. + */ + backlight_disable(jdi->backlight); + msleep(100); + + jdi->link1->mode_flags |= MIPI_DSI_MODE_LPM; + jdi->link2->mode_flags |= MIPI_DSI_MODE_LPM; + + err = regulator_enable(jdi->supply); + if (err < 0) { + dev_err(panel->dev, "failed to enable supply: %d\n", err); + return err; + } + /* T1 = 2ms */ + usleep_range(2000, 4000); + + err = regulator_enable(jdi->ddi_supply); + if (err < 0) { + dev_err(panel->dev, "failed to enable ddi_supply: %d\n", err); + return err; + } + /* T2 = 1ms */ + usleep_range(1000, 3000); + + gpiod_set_value(jdi->enable_gpio, 1); + /* T3 = 10ms */ + usleep_range(10000, 15000); + + gpiod_set_value(jdi->reset_gpio, 0); + /* Specified by JDI @ 3ms, subject to change */ + usleep_range(3000, 5000); + + /* + * TODO: The device supports both left-right and even-odd split + * configurations, but this driver currently supports only the left- + * right split. To support a different mode a mechanism needs to be + * put in place to communicate the configuration back to the DSI host + * controller. + */ + + err = jdi_setup_symmetrical_split(jdi->link1, jdi->link2, + jdi->mode); + if (err < 0) { + dev_err(panel->dev, "failed to set up symmetrical split: %d\n", + err); + goto poweroff; + } + + err = mipi_dsi_dcs_set_tear_scanline(jdi->link1, + jdi->mode->vdisplay - 16); + if (err < 0) + dev_err(panel->dev, "failed to set tear scanline: %d\n", err); + + err = mipi_dsi_dcs_set_tear_scanline(jdi->link2, + jdi->mode->vdisplay - 16); + if (err < 0) + dev_err(panel->dev, "failed to set tear scanline: %d\n", err); + + err = mipi_dsi_dcs_set_tear_on(jdi->link1, + MIPI_DSI_DCS_TEAR_MODE_VBLANK); + if (err < 0) + dev_err(panel->dev, "failed to set tear on: %d\n", err); + + err = mipi_dsi_dcs_set_tear_on(jdi->link2, + MIPI_DSI_DCS_TEAR_MODE_VBLANK); + if (err < 0) + dev_err(panel->dev, "failed to set tear on: %d\n", err); + + err = mipi_dsi_dcs_set_pixel_format(jdi->link1, format); + if (err < 0) { + dev_err(panel->dev, "failed to set pixel format: %d\n", err); + goto poweroff; + } + + err = mipi_dsi_dcs_set_pixel_format(jdi->link2, format); + if (err < 0) { + dev_err(panel->dev, "failed to set pixel format: %d\n", err); + goto poweroff; + } + + err = mipi_dsi_dcs_exit_sleep_mode(jdi->link1); + if (err < 0) { + dev_err(panel->dev, "failed to exit sleep mode: %d\n", err); + goto poweroff; + } + + err = mipi_dsi_dcs_exit_sleep_mode(jdi->link2); + if (err < 0) { + dev_err(panel->dev, "failed to exit sleep mode: %d\n", err); + goto poweroff; + } + + /* + * We need to wait 150ms between mipi_dsi_dcs_exit_sleep_mode() and + * mipi_dsi_dcs_set_display_on(). + */ + msleep(150); + + err = mipi_dsi_dcs_set_display_on(jdi->link1); + if (err < 0) + dev_err(panel->dev, "failed to set display on: %d\n", err); + + + err = mipi_dsi_dcs_set_display_on(jdi->link2); + if (err < 0) + dev_err(panel->dev, "failed to set display on: %d\n", err); + + jdi->prepared = true; + + jdi->link1->mode_flags &= ~MIPI_DSI_MODE_LPM; + jdi->link2->mode_flags &= ~MIPI_DSI_MODE_LPM; + + return 0; + +poweroff: + regulator_disable(jdi->ddi_supply); + + /* T6 = 2ms */ + usleep_range(7000, 9000); + + regulator_disable(jdi->supply); + + return err; +} + +static int jdi_panel_enable(struct drm_panel *panel) +{ + struct jdi_panel *jdi = to_panel_jdi(panel); + + if (jdi->enabled) + return 0; + + /* + * Ensure we send image data before turning the backlight on, + * to avoid the display showing random pixels (colored snow). + */ + jdi_wait_frames(jdi, 3); + + backlight_enable(jdi->backlight); + + jdi->enabled = true; + + return 0; +} + +static const struct drm_display_mode default_mode = { + .clock = 331334, + .hdisplay = 2560, + .hsync_start = 2560 + 80, + .hsync_end = 2560 + 80 + 80, + .htotal = 2560 + 80 + 80 + 80, + .vdisplay = 1800, + .vsync_start = 1800 + 4, + .vsync_end = 1800 + 4 + 4, + .vtotal = 1800 + 4 + 4 + 4, + .flags = 0, +}; + +static int jdi_panel_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct drm_display_mode *mode; + struct jdi_panel *jdi = to_panel_jdi(panel); + struct device *dev = &jdi->link1->dev; + + mode = drm_mode_duplicate(connector->dev, &default_mode); + if (!mode) { + dev_err(dev, "failed to add mode %ux%ux@%u\n", + default_mode.hdisplay, default_mode.vdisplay, + drm_mode_vrefresh(&default_mode)); + return -ENOMEM; + } + + drm_mode_set_name(mode); + + drm_mode_probed_add(connector, mode); + + connector->display_info.width_mm = 211; + connector->display_info.height_mm = 148; + connector->display_info.bpc = 8; + + return 1; +} + +static const struct drm_panel_funcs jdi_panel_funcs = { + .prepare = jdi_panel_prepare, + .enable = jdi_panel_enable, + .disable = jdi_panel_disable, + .unprepare = jdi_panel_unprepare, + .get_modes = jdi_panel_get_modes, +}; + +static const struct of_device_id jdi_of_match[] = { + { .compatible = "jdi,lpm102a188a", }, + { } +}; +MODULE_DEVICE_TABLE(of, jdi_of_match); + +static int jdi_panel_add(struct jdi_panel *jdi) +{ + struct device *dev = &jdi->link1->dev; + + jdi->mode = &default_mode; + + jdi->supply = devm_regulator_get(dev, "power"); + if (IS_ERR(jdi->supply)) + return dev_err_probe(dev, PTR_ERR(jdi->supply), + "failed to get power regulator\n"); + + jdi->ddi_supply = devm_regulator_get(dev, "ddi"); + if (IS_ERR(jdi->ddi_supply)) + return dev_err_probe(dev, PTR_ERR(jdi->ddi_supply), + "failed to get ddi regulator\n"); + + jdi->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(jdi->reset_gpio)) + return dev_err_probe(dev, PTR_ERR(jdi->reset_gpio), + "failed to get reset gpio\n"); + usleep_range(1000, 3000); + + jdi->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_LOW); + if (IS_ERR(jdi->enable_gpio)) + return dev_err_probe(dev, PTR_ERR(jdi->enable_gpio), + "failed to get enable gpio\n"); + usleep_range(2000, 4000); + + jdi->backlight = devm_of_find_backlight(dev); + if (IS_ERR(jdi->backlight)) + return dev_err_probe(dev, PTR_ERR(jdi->backlight), + "failed to create backlight\n"); + + drm_panel_init(&jdi->base, &jdi->link1->dev, &jdi_panel_funcs, + DRM_MODE_CONNECTOR_DSI); + + drm_panel_add(&jdi->base); + + return 0; +} + +static void jdi_panel_del(struct jdi_panel *jdi) +{ + if (jdi->base.dev) + drm_panel_remove(&jdi->base); + + if (jdi->link2) + put_device(&jdi->link2->dev); +} + +static int jdi_panel_dsi_probe(struct mipi_dsi_device *dsi) +{ + struct mipi_dsi_device *secondary = NULL; + struct jdi_panel *jdi; + struct device_node *np; + int err; + + dsi->lanes = 4; + dsi->format = MIPI_DSI_FMT_RGB888; + dsi->mode_flags = 0; + + /* Find DSI-LINK1 */ + np = of_parse_phandle(dsi->dev.of_node, "link2", 0); + if (np) { + secondary = of_find_mipi_dsi_device_by_node(np); + of_node_put(np); + + if (!secondary) + return -EPROBE_DEFER; + } + + /* register a panel for only the DSI-LINK1 interface */ + if (secondary) { + jdi = devm_kzalloc(&dsi->dev, sizeof(*jdi), GFP_KERNEL); + if (!jdi) { + put_device(&secondary->dev); + return -ENOMEM; + } + + mipi_dsi_set_drvdata(dsi, jdi); + + jdi->link1 = dsi; + jdi->link2 = secondary; + + err = jdi_panel_add(jdi); + if (err < 0) { + put_device(&secondary->dev); + return err; + } + } + + err = mipi_dsi_attach(dsi); + if (err < 0) { + if (secondary) + jdi_panel_del(jdi); + + return err; + } + + return 0; +} + +static void jdi_panel_dsi_remove(struct mipi_dsi_device *dsi) +{ + struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi); + int err; + + /* only detach from host for the DSI-LINK2 interface */ + if (!jdi) + mipi_dsi_detach(dsi); + + err = jdi_panel_disable(&jdi->base); + if (err < 0) + dev_err(&dsi->dev, "failed to disable 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); + + jdi_panel_del(jdi); +} + +static void jdi_panel_dsi_shutdown(struct mipi_dsi_device *dsi) +{ + struct jdi_panel *jdi = mipi_dsi_get_drvdata(dsi); + + if (!jdi) + return; + + jdi_panel_disable(&jdi->base); +} + +static struct mipi_dsi_driver jdi_panel_dsi_driver = { + .driver = { + .name = "panel-jdi-lpm102a188a-dsi", + .of_match_table = jdi_of_match, + }, + .probe = jdi_panel_dsi_probe, + .remove = jdi_panel_dsi_remove, + .shutdown = jdi_panel_dsi_shutdown, +}; +module_mipi_dsi_driver(jdi_panel_dsi_driver); + +MODULE_AUTHOR("Sean Paul <seanp...@chromium.org>"); +MODULE_AUTHOR("Diogo Ivo <diogo....@tecnico.ulisboa.pt>"); +MODULE_DESCRIPTION("DRM Driver for JDI LPM102A188A DSI panel, command mode"); +MODULE_LICENSE("GPL"); -- 2.38.1
