1// SPDX-License-Identifier: GPL-2.0-only 2// Copyright (C) 2019, Michael Srba 3 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 bool prepared; 23}; 24 25static inline struct 26s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel) 27{ 28 return container_of(panel, struct s6e88a0_ams452ef01, panel); 29} 30 31static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx) 32{ 33 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 34 usleep_range(5000, 6000); 35 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 36 usleep_range(1000, 2000); 37 gpiod_set_value_cansleep(ctx->reset_gpio, 1); 38 usleep_range(10000, 11000); 39} 40 41static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx) 42{ 43 struct mipi_dsi_device *dsi = ctx->dsi; 44 struct device *dev = &dsi->dev; 45 int ret; 46 47 dsi->mode_flags |= MIPI_DSI_MODE_LPM; 48 49 mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands 50 mipi_dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity 51 52 ret = mipi_dsi_dcs_exit_sleep_mode(dsi); 53 if (ret < 0) { 54 dev_err(dev, "Failed to exit sleep mode: %d\n", ret); 55 return ret; 56 } 57 msleep(120); 58 59 // set default brightness/gama 60 mipi_dsi_dcs_write_seq(dsi, 0xca, 61 0x01, 0x00, 0x01, 0x00, 0x01, 0x00, // V255 RR,GG,BB 62 0x80, 0x80, 0x80, // V203 R,G,B 63 0x80, 0x80, 0x80, // V151 R,G,B 64 0x80, 0x80, 0x80, // V87 R,G,B 65 0x80, 0x80, 0x80, // V51 R,G,B 66 0x80, 0x80, 0x80, // V35 R,G,B 67 0x80, 0x80, 0x80, // V23 R,G,B 68 0x80, 0x80, 0x80, // V11 R,G,B 69 0x6b, 0x68, 0x71, // V3 R,G,B 70 0x00, 0x00, 0x00); // V1 R,G,B 71 // set default Amoled Off Ratio 72 mipi_dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a); 73 mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage 74 mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00); 75 mipi_dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update 76 mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands 77 78 ret = mipi_dsi_dcs_set_display_on(dsi); 79 if (ret < 0) { 80 dev_err(dev, "Failed to set display on: %d\n", ret); 81 return ret; 82 } 83 84 return 0; 85} 86 87static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx) 88{ 89 struct mipi_dsi_device *dsi = ctx->dsi; 90 struct device *dev = &dsi->dev; 91 int ret; 92 93 dsi->mode_flags &= ~MIPI_DSI_MODE_LPM; 94 95 ret = mipi_dsi_dcs_set_display_off(dsi); 96 if (ret < 0) { 97 dev_err(dev, "Failed to set display off: %d\n", ret); 98 return ret; 99 } 100 msleep(35); 101 102 ret = mipi_dsi_dcs_enter_sleep_mode(dsi); 103 if (ret < 0) { 104 dev_err(dev, "Failed to enter sleep mode: %d\n", ret); 105 return ret; 106 } 107 msleep(120); 108 109 return 0; 110} 111 112static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel) 113{ 114 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel); 115 struct device *dev = &ctx->dsi->dev; 116 int ret; 117 118 if (ctx->prepared) 119 return 0; 120 121 ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 122 if (ret < 0) { 123 dev_err(dev, "Failed to enable regulators: %d\n", ret); 124 return ret; 125 } 126 127 s6e88a0_ams452ef01_reset(ctx); 128 129 ret = s6e88a0_ams452ef01_on(ctx); 130 if (ret < 0) { 131 dev_err(dev, "Failed to initialize panel: %d\n", ret); 132 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 133 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), 134 ctx->supplies); 135 return ret; 136 } 137 138 ctx->prepared = true; 139 return 0; 140} 141 142static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel) 143{ 144 struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel); 145 struct device *dev = &ctx->dsi->dev; 146 int ret; 147 148 if (!ctx->prepared) 149 return 0; 150 151 ret = s6e88a0_ams452ef01_off(ctx); 152 if (ret < 0) 153 dev_err(dev, "Failed to un-initialize panel: %d\n", ret); 154 155 gpiod_set_value_cansleep(ctx->reset_gpio, 0); 156 regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies); 157 158 ctx->prepared = false; 159 return 0; 160} 161 162static const struct drm_display_mode s6e88a0_ams452ef01_mode = { 163 .clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000, 164 .hdisplay = 540, 165 .hsync_start = 540 + 88, 166 .hsync_end = 540 + 88 + 4, 167 .htotal = 540 + 88 + 4 + 20, 168 .vdisplay = 960, 169 .vsync_start = 960 + 14, 170 .vsync_end = 960 + 14 + 2, 171 .vtotal = 960 + 14 + 2 + 8, 172 .width_mm = 56, 173 .height_mm = 100, 174}; 175 176static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel, 177 struct drm_connector *connector) 178{ 179 struct drm_display_mode *mode; 180 181 mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode); 182 if (!mode) 183 return -ENOMEM; 184 185 drm_mode_set_name(mode); 186 187 mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; 188 connector->display_info.width_mm = mode->width_mm; 189 connector->display_info.height_mm = mode->height_mm; 190 drm_mode_probed_add(connector, mode); 191 192 return 1; 193} 194 195static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = { 196 .unprepare = s6e88a0_ams452ef01_unprepare, 197 .prepare = s6e88a0_ams452ef01_prepare, 198 .get_modes = s6e88a0_ams452ef01_get_modes, 199}; 200 201static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi) 202{ 203 struct device *dev = &dsi->dev; 204 struct s6e88a0_ams452ef01 *ctx; 205 int ret; 206 207 ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); 208 if (!ctx) 209 return -ENOMEM; 210 211 ctx->supplies[0].supply = "vdd3"; 212 ctx->supplies[1].supply = "vci"; 213 ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies), 214 ctx->supplies); 215 if (ret < 0) { 216 dev_err(dev, "Failed to get regulators: %d\n", ret); 217 return ret; 218 } 219 220 ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW); 221 if (IS_ERR(ctx->reset_gpio)) { 222 ret = PTR_ERR(ctx->reset_gpio); 223 dev_err(dev, "Failed to get reset-gpios: %d\n", ret); 224 return ret; 225 } 226 227 ctx->dsi = dsi; 228 mipi_dsi_set_drvdata(dsi, ctx); 229 230 dsi->lanes = 2; 231 dsi->format = MIPI_DSI_FMT_RGB888; 232 dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST; 233 234 drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs, 235 DRM_MODE_CONNECTOR_DSI); 236 237 drm_panel_add(&ctx->panel); 238 239 ret = mipi_dsi_attach(dsi); 240 if (ret < 0) { 241 dev_err(dev, "Failed to attach to DSI host: %d\n", ret); 242 drm_panel_remove(&ctx->panel); 243 return ret; 244 } 245 246 return 0; 247} 248 249static void s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi) 250{ 251 struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi); 252 int ret; 253 254 ret = mipi_dsi_detach(dsi); 255 if (ret < 0) 256 dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret); 257 258 drm_panel_remove(&ctx->panel); 259} 260 261static const struct of_device_id s6e88a0_ams452ef01_of_match[] = { 262 { .compatible = "samsung,s6e88a0-ams452ef01" }, 263 { /* sentinel */ }, 264}; 265MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match); 266 267static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = { 268 .probe = s6e88a0_ams452ef01_probe, 269 .remove = s6e88a0_ams452ef01_remove, 270 .driver = { 271 .name = "panel-s6e88a0-ams452ef01", 272 .of_match_table = s6e88a0_ams452ef01_of_match, 273 }, 274}; 275module_mipi_dsi_driver(s6e88a0_ams452ef01_driver); 276 277MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>"); 278MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller"); 279MODULE_LICENSE("GPL v2"); 280