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1// SPDX-License-Identifier: GPL-2.0-only2// Copyright (C) 2019, Michael Srba3 4#include <linux/delay.h>5#include <linux/gpio/consumer.h>6#include <linux/module.h>7#include <linux/of.h>8#include <linux/regulator/consumer.h>9 10#include <video/mipi_display.h>11 12#include <drm/drm_mipi_dsi.h>13#include <drm/drm_modes.h>14#include <drm/drm_panel.h>15 16struct s6e88a0_ams452ef01 {17 struct drm_panel panel;18 struct mipi_dsi_device *dsi;19 struct regulator_bulk_data supplies[2];20 struct gpio_desc *reset_gpio;21};22 23static inline struct24s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)25{26 return container_of(panel, struct s6e88a0_ams452ef01, panel);27}28 29static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)30{31 gpiod_set_value_cansleep(ctx->reset_gpio, 1);32 usleep_range(5000, 6000);33 gpiod_set_value_cansleep(ctx->reset_gpio, 0);34 usleep_range(1000, 2000);35 gpiod_set_value_cansleep(ctx->reset_gpio, 1);36 usleep_range(10000, 11000);37}38 39static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)40{41 struct mipi_dsi_device *dsi = ctx->dsi;42 struct device *dev = &dsi->dev;43 int ret;44 45 dsi->mode_flags |= MIPI_DSI_MODE_LPM;46 47 mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands48 mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity49 50 ret = mipi_dsi_dcs_exit_sleep_mode(dsi);51 if (ret < 0) {52 dev_err(dev, "Failed to exit sleep mode: %d\n", ret);53 return ret;54 }55 msleep(120);56 57 // set default brightness/gama58 mipi_dsi_dcs_write_seq(dsi, 0xca,59 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, // V255 RR,GG,BB60 0x80, 0x80, 0x80, // V203 R,G,B61 0x80, 0x80, 0x80, // V151 R,G,B62 0x80, 0x80, 0x80, // V87 R,G,B63 0x80, 0x80, 0x80, // V51 R,G,B64 0x80, 0x80, 0x80, // V35 R,G,B65 0x80, 0x80, 0x80, // V23 R,G,B66 0x80, 0x80, 0x80, // V11 R,G,B67 0x6b, 0x68, 0x71, // V3 R,G,B68 0x00, 0x00, 0x00); // V1 R,G,B69 // set default Amoled Off Ratio70 mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a);71 mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage72 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);73 mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update74 mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands75 76 ret = mipi_dsi_dcs_set_display_on(dsi);77 if (ret < 0) {78 dev_err(dev, "Failed to set display on: %d\n", ret);79 return ret;80 }81 82 return 0;83}84 85static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)86{87 struct mipi_dsi_device *dsi = ctx->dsi;88 struct device *dev = &dsi->dev;89 int ret;90 91 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;92 93 ret = mipi_dsi_dcs_set_display_off(dsi);94 if (ret < 0) {95 dev_err(dev, "Failed to set display off: %d\n", ret);96 return ret;97 }98 msleep(35);99 100 ret = mipi_dsi_dcs_enter_sleep_mode(dsi);101 if (ret < 0) {102 dev_err(dev, "Failed to enter sleep mode: %d\n", ret);103 return ret;104 }105 msleep(120);106 107 return 0;108}109 110static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)111{112 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);113 struct device *dev = &ctx->dsi->dev;114 int ret;115 116 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);117 if (ret < 0) {118 dev_err(dev, "Failed to enable regulators: %d\n", ret);119 return ret;120 }121 122 s6e88a0_ams452ef01_reset(ctx);123 124 ret = s6e88a0_ams452ef01_on(ctx);125 if (ret < 0) {126 dev_err(dev, "Failed to initialize panel: %d\n", ret);127 gpiod_set_value_cansleep(ctx->reset_gpio, 0);128 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),129 ctx->supplies);130 return ret;131 }132 133 return 0;134}135 136static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)137{138 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);139 struct device *dev = &ctx->dsi->dev;140 int ret;141 142 ret = s6e88a0_ams452ef01_off(ctx);143 if (ret < 0)144 dev_err(dev, "Failed to un-initialize panel: %d\n", ret);145 146 gpiod_set_value_cansleep(ctx->reset_gpio, 0);147 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);148 149 return 0;150}151 152static const struct drm_display_mode s6e88a0_ams452ef01_mode = {153 .clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,154 .hdisplay = 540,155 .hsync_start = 540 + 88,156 .hsync_end = 540 + 88 + 4,157 .htotal = 540 + 88 + 4 + 20,158 .vdisplay = 960,159 .vsync_start = 960 + 14,160 .vsync_end = 960 + 14 + 2,161 .vtotal = 960 + 14 + 2 + 8,162 .width_mm = 56,163 .height_mm = 100,164};165 166static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,167 struct drm_connector *connector)168{169 struct drm_display_mode *mode;170 171 mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);172 if (!mode)173 return -ENOMEM;174 175 drm_mode_set_name(mode);176 177 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;178 connector->display_info.width_mm = mode->width_mm;179 connector->display_info.height_mm = mode->height_mm;180 drm_mode_probed_add(connector, mode);181 182 return 1;183}184 185static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {186 .unprepare = s6e88a0_ams452ef01_unprepare,187 .prepare = s6e88a0_ams452ef01_prepare,188 .get_modes = s6e88a0_ams452ef01_get_modes,189};190 191static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)192{193 struct device *dev = &dsi->dev;194 struct s6e88a0_ams452ef01 *ctx;195 int ret;196 197 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);198 if (!ctx)199 return -ENOMEM;200 201 ctx->supplies[0].supply = "vdd3";202 ctx->supplies[1].supply = "vci";203 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),204 ctx->supplies);205 if (ret < 0) {206 dev_err(dev, "Failed to get regulators: %d\n", ret);207 return ret;208 }209 210 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);211 if (IS_ERR(ctx->reset_gpio)) {212 ret = PTR_ERR(ctx->reset_gpio);213 dev_err(dev, "Failed to get reset-gpios: %d\n", ret);214 return ret;215 }216 217 ctx->dsi = dsi;218 mipi_dsi_set_drvdata(dsi, ctx);219 220 dsi->lanes = 2;221 dsi->format = MIPI_DSI_FMT_RGB888;222 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;223 224 drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,225 DRM_MODE_CONNECTOR_DSI);226 227 drm_panel_add(&ctx->panel);228 229 ret = mipi_dsi_attach(dsi);230 if (ret < 0) {231 dev_err(dev, "Failed to attach to DSI host: %d\n", ret);232 drm_panel_remove(&ctx->panel);233 return ret;234 }235 236 return 0;237}238 239static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)240{241 struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);242 int ret;243 244 ret = mipi_dsi_detach(dsi);245 if (ret < 0)246 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);247 248 drm_panel_remove(&ctx->panel);249}250 251static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {252 { .compatible = "samsung,s6e88a0-ams452ef01" },253 { /* sentinel */ },254};255MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);256 257static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {258 .probe = s6e88a0_ams452ef01_probe,259 .remove = s6e88a0_ams452ef01_remove,260 .driver = {261 .name = "panel-s6e88a0-ams452ef01",262 .of_match_table = s6e88a0_ams452ef01_of_match,263 },264};265module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);266 267MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");268MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");269MODULE_LICENSE("GPL v2");270