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- // SPDX-License-Identifier: GPL-2.0
- /*
- * S6E63M0 AMOLED LCD drm_panel driver.
- *
- * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
- * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
- *
- * Andrzej Hajda <a.hajda@samsung.com>
- */
- #include <drm/drm_modes.h>
- #include <drm/drm_panel.h>
- #include <linux/backlight.h>
- #include <linux/delay.h>
- #include <linux/gpio/consumer.h>
- #include <linux/module.h>
- #include <linux/regulator/consumer.h>
- #include <video/mipi_display.h>
- #include "panel-samsung-s6e63m0.h"
- /* Manufacturer Command Set */
- #define MCS_ELVSS_ON 0xb1
- #define MCS_MIECTL1 0xc0
- #define MCS_BCMODE 0xc1
- #define MCS_ERROR_CHECK 0xd5
- #define MCS_READ_ID1 0xda
- #define MCS_READ_ID2 0xdb
- #define MCS_READ_ID3 0xdc
- #define MCS_LEVEL_2_KEY 0xf0
- #define MCS_MTP_KEY 0xf1
- #define MCS_DISCTL 0xf2
- #define MCS_SRCCTL 0xf6
- #define MCS_IFCTL 0xf7
- #define MCS_PANELCTL 0xF8
- #define MCS_PGAMMACTL 0xfa
- #define S6E63M0_LCD_ID_VALUE_M2 0xA4
- #define S6E63M0_LCD_ID_VALUE_SM2 0xB4
- #define S6E63M0_LCD_ID_VALUE_SM2_1 0xB6
- #define NUM_GAMMA_LEVELS 11
- #define GAMMA_TABLE_COUNT 23
- #define MAX_BRIGHTNESS (NUM_GAMMA_LEVELS - 1)
- /* array of gamma tables for gamma value 2.2 */
- static u8 const s6e63m0_gamma_22[NUM_GAMMA_LEVELS][GAMMA_TABLE_COUNT] = {
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x78, 0xEC, 0x3D, 0xC8,
- 0xC2, 0xB6, 0xC4, 0xC7, 0xB6, 0xD5, 0xD7,
- 0xCC, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x73, 0x4A, 0x3D, 0xC0,
- 0xC2, 0xB1, 0xBB, 0xBE, 0xAC, 0xCE, 0xCF,
- 0xC5, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x70, 0x51, 0x3E, 0xBF,
- 0xC1, 0xAF, 0xB9, 0xBC, 0xAB, 0xCC, 0xCC,
- 0xC2, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x6C, 0x54, 0x3A, 0xBC,
- 0xBF, 0xAC, 0xB7, 0xBB, 0xA9, 0xC9, 0xC9,
- 0xBE, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x69, 0x54, 0x37, 0xBB,
- 0xBE, 0xAC, 0xB4, 0xB7, 0xA6, 0xC7, 0xC8,
- 0xBC, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x66, 0x55, 0x34, 0xBA,
- 0xBD, 0xAB, 0xB1, 0xB5, 0xA3, 0xC5, 0xC6,
- 0xB9, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x63, 0x53, 0x31, 0xB8,
- 0xBC, 0xA9, 0xB0, 0xB5, 0xA2, 0xC4, 0xC4,
- 0xB8, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x62, 0x54, 0x30, 0xB9,
- 0xBB, 0xA9, 0xB0, 0xB3, 0xA1, 0xC1, 0xC3,
- 0xB7, 0x00, 0x91, 0x00, 0x95, 0x00, 0xDA },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x66, 0x58, 0x34, 0xB6,
- 0xBA, 0xA7, 0xAF, 0xB3, 0xA0, 0xC1, 0xC2,
- 0xB7, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xB6,
- 0xBA, 0xA8, 0xAC, 0xB1, 0x9D, 0xC1, 0xC1,
- 0xB7, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
- { MCS_PGAMMACTL, 0x00,
- 0x18, 0x08, 0x24, 0x5f, 0x50, 0x2d, 0xB6,
- 0xB9, 0xA7, 0xAd, 0xB1, 0x9f, 0xbe, 0xC0,
- 0xB5, 0x00, 0xa0, 0x00, 0xa4, 0x00, 0xdb },
- };
- struct s6e63m0 {
- struct device *dev;
- int (*dcs_read)(struct device *dev, const u8 cmd, u8 *val);
- int (*dcs_write)(struct device *dev, const u8 *data, size_t len);
- struct drm_panel panel;
- struct backlight_device *bl_dev;
- u8 lcd_type;
- struct regulator_bulk_data supplies[2];
- struct gpio_desc *reset_gpio;
- bool prepared;
- bool enabled;
- /*
- * This field is tested by functions directly accessing bus before
- * transfer, transfer is skipped if it is set. In case of transfer
- * failure or unexpected response the field is set to error value.
- * Such construct allows to eliminate many checks in higher level
- * functions.
- */
- int error;
- };
- static const struct drm_display_mode default_mode = {
- .clock = 25628,
- .hdisplay = 480,
- .hsync_start = 480 + 16,
- .hsync_end = 480 + 16 + 2,
- .htotal = 480 + 16 + 2 + 16,
- .vdisplay = 800,
- .vsync_start = 800 + 28,
- .vsync_end = 800 + 28 + 2,
- .vtotal = 800 + 28 + 2 + 1,
- .width_mm = 53,
- .height_mm = 89,
- .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
- };
- static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
- {
- return container_of(panel, struct s6e63m0, panel);
- }
- static int s6e63m0_clear_error(struct s6e63m0 *ctx)
- {
- int ret = ctx->error;
- ctx->error = 0;
- return ret;
- }
- static void s6e63m0_dcs_read(struct s6e63m0 *ctx, const u8 cmd, u8 *data)
- {
- if (ctx->error < 0)
- return;
- ctx->error = ctx->dcs_read(ctx->dev, cmd, data);
- }
- static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
- {
- if (ctx->error < 0 || len == 0)
- return;
- ctx->error = ctx->dcs_write(ctx->dev, data, len);
- }
- #define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
- ({ \
- static const u8 d[] = { seq }; \
- s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
- })
- static int s6e63m0_check_lcd_type(struct s6e63m0 *ctx)
- {
- u8 id1, id2, id3;
- int ret;
- s6e63m0_dcs_read(ctx, MCS_READ_ID1, &id1);
- s6e63m0_dcs_read(ctx, MCS_READ_ID2, &id2);
- s6e63m0_dcs_read(ctx, MCS_READ_ID3, &id3);
- ret = s6e63m0_clear_error(ctx);
- if (ret) {
- dev_err(ctx->dev, "error checking LCD type (%d)\n", ret);
- ctx->lcd_type = 0x00;
- return ret;
- }
- dev_info(ctx->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);
- /* We attempt to detect what panel is mounted on the controller */
- switch (id2) {
- case S6E63M0_LCD_ID_VALUE_M2:
- dev_info(ctx->dev, "detected LCD panel AMS397GE MIPI M2\n");
- break;
- case S6E63M0_LCD_ID_VALUE_SM2:
- case S6E63M0_LCD_ID_VALUE_SM2_1:
- dev_info(ctx->dev, "detected LCD panel AMS397GE MIPI SM2\n");
- break;
- default:
- dev_info(ctx->dev, "unknown LCD panel type %02x\n", id2);
- break;
- }
- ctx->lcd_type = id2;
- return 0;
- }
- static void s6e63m0_init(struct s6e63m0 *ctx)
- {
- s6e63m0_dcs_write_seq_static(ctx, MCS_PANELCTL,
- 0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
- 0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
- s6e63m0_dcs_write_seq_static(ctx, MCS_DISCTL,
- 0x02, 0x03, 0x1c, 0x10, 0x10);
- s6e63m0_dcs_write_seq_static(ctx, MCS_IFCTL,
- 0x03, 0x00, 0x00);
- s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL,
- 0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
- 0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
- 0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
- 0xd6);
- s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL,
- 0x01);
- s6e63m0_dcs_write_seq_static(ctx, MCS_SRCCTL,
- 0x00, 0x8c, 0x07);
- s6e63m0_dcs_write_seq_static(ctx, 0xb3,
- 0xc);
- s6e63m0_dcs_write_seq_static(ctx, 0xb5,
- 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
- 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
- 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
- 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
- 0x21, 0x20, 0x1e, 0x1e);
- s6e63m0_dcs_write_seq_static(ctx, 0xb6,
- 0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
- 0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
- 0x66, 0x66);
- s6e63m0_dcs_write_seq_static(ctx, 0xb7,
- 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
- 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
- 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
- 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
- 0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
- 0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
- 0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
- s6e63m0_dcs_write_seq_static(ctx, 0xb9,
- 0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
- 0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
- 0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
- 0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
- 0x21, 0x20, 0x1e, 0x1e);
- s6e63m0_dcs_write_seq_static(ctx, 0xba,
- 0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
- 0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
- 0x66, 0x66);
- s6e63m0_dcs_write_seq_static(ctx, MCS_BCMODE,
- 0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
- 0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
- 0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
- 0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
- s6e63m0_dcs_write_seq_static(ctx, 0xb2,
- 0x10, 0x10, 0x0b, 0x05);
- s6e63m0_dcs_write_seq_static(ctx, MCS_MIECTL1,
- 0x01);
- s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
- 0x0b);
- }
- static int s6e63m0_power_on(struct s6e63m0 *ctx)
- {
- int ret;
- ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
- if (ret < 0)
- return ret;
- msleep(25);
- /* Be sure to send a reset pulse */
- gpiod_set_value(ctx->reset_gpio, 1);
- msleep(5);
- gpiod_set_value(ctx->reset_gpio, 0);
- msleep(120);
- return 0;
- }
- static int s6e63m0_power_off(struct s6e63m0 *ctx)
- {
- int ret;
- gpiod_set_value(ctx->reset_gpio, 1);
- msleep(120);
- ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
- if (ret < 0)
- return ret;
- return 0;
- }
- static int s6e63m0_disable(struct drm_panel *panel)
- {
- struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
- if (!ctx->enabled)
- return 0;
- backlight_disable(ctx->bl_dev);
- s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
- msleep(10);
- s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
- msleep(120);
- ctx->enabled = false;
- return 0;
- }
- static int s6e63m0_unprepare(struct drm_panel *panel)
- {
- struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
- int ret;
- if (!ctx->prepared)
- return 0;
- s6e63m0_clear_error(ctx);
- ret = s6e63m0_power_off(ctx);
- if (ret < 0)
- return ret;
- ctx->prepared = false;
- return 0;
- }
- static int s6e63m0_prepare(struct drm_panel *panel)
- {
- struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
- int ret;
- if (ctx->prepared)
- return 0;
- ret = s6e63m0_power_on(ctx);
- if (ret < 0)
- return ret;
- /* Magic to unlock level 2 control of the display */
- s6e63m0_dcs_write_seq_static(ctx, MCS_LEVEL_2_KEY, 0x5a, 0x5a);
- /* Magic to unlock MTP reading */
- s6e63m0_dcs_write_seq_static(ctx, MCS_MTP_KEY, 0x5a, 0x5a);
- ret = s6e63m0_check_lcd_type(ctx);
- if (ret < 0)
- return ret;
- s6e63m0_init(ctx);
- ret = s6e63m0_clear_error(ctx);
- if (ret < 0)
- s6e63m0_unprepare(panel);
- ctx->prepared = true;
- return ret;
- }
- static int s6e63m0_enable(struct drm_panel *panel)
- {
- struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
- if (ctx->enabled)
- return 0;
- s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
- msleep(120);
- s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
- msleep(10);
- s6e63m0_dcs_write_seq_static(ctx, MCS_ERROR_CHECK,
- 0xE7, 0x14, 0x60, 0x17, 0x0A, 0x49, 0xC3,
- 0x8F, 0x19, 0x64, 0x91, 0x84, 0x76, 0x20,
- 0x0F, 0x00);
- backlight_enable(ctx->bl_dev);
- ctx->enabled = true;
- return 0;
- }
- static int s6e63m0_get_modes(struct drm_panel *panel,
- struct drm_connector *connector)
- {
- struct drm_display_mode *mode;
- mode = drm_mode_duplicate(connector->dev, &default_mode);
- if (!mode) {
- dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
- default_mode.hdisplay, default_mode.vdisplay,
- drm_mode_vrefresh(&default_mode));
- return -ENOMEM;
- }
- drm_mode_set_name(mode);
- mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
- drm_mode_probed_add(connector, mode);
- return 1;
- }
- static const struct drm_panel_funcs s6e63m0_drm_funcs = {
- .disable = s6e63m0_disable,
- .unprepare = s6e63m0_unprepare,
- .prepare = s6e63m0_prepare,
- .enable = s6e63m0_enable,
- .get_modes = s6e63m0_get_modes,
- };
- static int s6e63m0_set_brightness(struct backlight_device *bd)
- {
- struct s6e63m0 *ctx = bl_get_data(bd);
- int brightness = bd->props.brightness;
- /* disable and set new gamma */
- s6e63m0_dcs_write(ctx, s6e63m0_gamma_22[brightness],
- ARRAY_SIZE(s6e63m0_gamma_22[brightness]));
- /* update gamma table. */
- s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL, 0x01);
- return s6e63m0_clear_error(ctx);
- }
- static const struct backlight_ops s6e63m0_backlight_ops = {
- .update_status = s6e63m0_set_brightness,
- };
- static int s6e63m0_backlight_register(struct s6e63m0 *ctx)
- {
- struct backlight_properties props = {
- .type = BACKLIGHT_RAW,
- .brightness = MAX_BRIGHTNESS,
- .max_brightness = MAX_BRIGHTNESS
- };
- struct device *dev = ctx->dev;
- int ret = 0;
- ctx->bl_dev = devm_backlight_device_register(dev, "panel", dev, ctx,
- &s6e63m0_backlight_ops,
- &props);
- if (IS_ERR(ctx->bl_dev)) {
- ret = PTR_ERR(ctx->bl_dev);
- dev_err(dev, "error registering backlight device (%d)\n", ret);
- }
- return ret;
- }
- int s6e63m0_probe(struct device *dev,
- int (*dcs_read)(struct device *dev, const u8 cmd, u8 *val),
- int (*dcs_write)(struct device *dev, const u8 *data, size_t len),
- bool dsi_mode)
- {
- struct s6e63m0 *ctx;
- int ret;
- ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
- if (!ctx)
- return -ENOMEM;
- ctx->dcs_read = dcs_read;
- ctx->dcs_write = dcs_write;
- dev_set_drvdata(dev, ctx);
- ctx->dev = dev;
- ctx->enabled = false;
- ctx->prepared = false;
- ctx->supplies[0].supply = "vdd3";
- ctx->supplies[1].supply = "vci";
- ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
- ctx->supplies);
- if (ret < 0) {
- dev_err(dev, "failed to get regulators: %d\n", ret);
- return ret;
- }
- ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(ctx->reset_gpio)) {
- dev_err(dev, "cannot get reset-gpios %ld\n", PTR_ERR(ctx->reset_gpio));
- return PTR_ERR(ctx->reset_gpio);
- }
- drm_panel_init(&ctx->panel, dev, &s6e63m0_drm_funcs,
- dsi_mode ? DRM_MODE_CONNECTOR_DSI :
- DRM_MODE_CONNECTOR_DPI);
- ret = s6e63m0_backlight_register(ctx);
- if (ret < 0)
- return ret;
- drm_panel_add(&ctx->panel);
- return 0;
- }
- EXPORT_SYMBOL_GPL(s6e63m0_probe);
- int s6e63m0_remove(struct device *dev)
- {
- struct s6e63m0 *ctx = dev_get_drvdata(dev);
- drm_panel_remove(&ctx->panel);
- return 0;
- }
- EXPORT_SYMBOL_GPL(s6e63m0_remove);
- MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
- MODULE_DESCRIPTION("s6e63m0 LCD Driver");
- MODULE_LICENSE("GPL v2");
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