--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * TDO Y17P TFT LCD drm_panel driver.
+ *
+ * SPI configured DPI display controller
+ * Copyright (C) 2022 Raspberry Pi Ltd
+ *
+ * Derived from drivers/drm/gpu/panel/panel-sitronix-st7789v.c
+ * Copyright (C) 2017 Free Electrons
+ */
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+#include <linux/bitops.h>
+#include <linux/gpio/consumer.h>
+#include <linux/media-bus-format.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+struct tdo_y17p {
+ struct drm_panel panel;
+ struct spi_device *spi;
+ struct gpio_desc *reset;
+ struct regulator *power;
+ u32 bus_format;
+};
+
+static const u16 panel_init[] = {
+ 0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x101, 0x008, 0x110,
+ 0x021, 0x109, 0x030, 0x102, 0x031, 0x100, 0x040, 0x110,
+ 0x041, 0x155, 0x042, 0x102, 0x043, 0x109, 0x044, 0x107,
+ 0x050, 0x178, 0x051, 0x178, 0x052, 0x100, 0x053, 0x16d,
+ 0x060, 0x107, 0x061, 0x100, 0x062, 0x108, 0x063, 0x100,
+ 0x0a0, 0x100, 0x0a1, 0x107, 0x0a2, 0x10c, 0x0a3, 0x10b,
+ 0x0a4, 0x103, 0x0a5, 0x107, 0x0a6, 0x106, 0x0a7, 0x104,
+ 0x0a8, 0x108, 0x0a9, 0x10c, 0x0aa, 0x113, 0x0ab, 0x106,
+ 0x0ac, 0x10d, 0x0ad, 0x119, 0x0ae, 0x110, 0x0af, 0x100,
+ 0x0c0, 0x100, 0x0c1, 0x107, 0x0c2, 0x10c, 0x0c3, 0x10b,
+ 0x0c4, 0x103, 0x0c5, 0x107, 0x0c6, 0x107, 0x0c7, 0x104,
+ 0x0c8, 0x108, 0x0c9, 0x10c, 0x0ca, 0x113, 0x0cb, 0x106,
+ 0x0cc, 0x10d, 0x0cd, 0x118, 0x0ce, 0x110, 0x0cf, 0x100,
+ 0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x106, 0x000, 0x120,
+ 0x001, 0x10a, 0x002, 0x100, 0x003, 0x100, 0x004, 0x101,
+ 0x005, 0x101, 0x006, 0x198, 0x007, 0x106, 0x008, 0x101,
+ 0x009, 0x180, 0x00a, 0x100, 0x00b, 0x100, 0x00c, 0x101,
+ 0x00d, 0x101, 0x00e, 0x100, 0x00f, 0x100, 0x010, 0x1f0,
+ 0x011, 0x1f4, 0x012, 0x101, 0x013, 0x100, 0x014, 0x100,
+ 0x015, 0x1c0, 0x016, 0x108, 0x017, 0x100, 0x018, 0x100,
+ 0x019, 0x100, 0x01a, 0x100, 0x01b, 0x100, 0x01c, 0x100,
+ 0x01d, 0x100, 0x020, 0x101, 0x021, 0x123, 0x022, 0x145,
+ 0x023, 0x167, 0x024, 0x101, 0x025, 0x123, 0x026, 0x145,
+ 0x027, 0x167, 0x030, 0x111, 0x031, 0x111, 0x032, 0x100,
+ 0x033, 0x1ee, 0x034, 0x1ff, 0x035, 0x1bb, 0x036, 0x1aa,
+ 0x037, 0x1dd, 0x038, 0x1cc, 0x039, 0x166, 0x03a, 0x177,
+ 0x03b, 0x122, 0x03c, 0x122, 0x03d, 0x122, 0x03e, 0x122,
+ 0x03f, 0x122, 0x040, 0x122, 0x052, 0x110, 0x053, 0x110,
+ 0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x107, 0x018, 0x11d,
+ 0x017, 0x122, 0x002, 0x177, 0x026, 0x1b2, 0x0e1, 0x179,
+ 0x0ff, 0x1ff, 0x198, 0x106, 0x104, 0x100, 0x03a, 0x160,
+ 0x035, 0x100, 0x011, 0x100,
+};
+
+#define NUM_INIT_REGS ARRAY_SIZE(panel_init)
+
+static inline struct tdo_y17p *panel_to_tdo_y17p(struct drm_panel *panel)
+{
+ return container_of(panel, struct tdo_y17p, panel);
+}
+
+static int tdo_y17p_write_msg(struct tdo_y17p *ctx, const u16 *msg, unsigned int len)
+{
+ struct spi_transfer xfer = { };
+ struct spi_message spi;
+
+ spi_message_init(&spi);
+
+ xfer.tx_buf = msg;
+ xfer.bits_per_word = 9;
+ xfer.len = sizeof(u16) * len;
+
+ spi_message_add_tail(&xfer, &spi);
+ return spi_sync(ctx->spi, &spi);
+}
+
+static const struct drm_display_mode tdo_y17pe_720x720_mode = {
+ .clock = 36720,
+ .hdisplay = 720,
+ .hsync_start = 720 + 20,
+ .hsync_end = 720 + 20 + 20,
+ .htotal = 720 + 20 + 20 + 40,
+ .vdisplay = 720,
+ .vsync_start = 720 + 15,
+ .vsync_end = 720 + 15 + 15,
+ .vtotal = 720 + 15 + 15 + 15,
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
+};
+
+static int tdo_y17p_get_modes(struct drm_panel *panel,
+ struct drm_connector *connector)
+{
+ struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(connector->dev, &tdo_y17pe_720x720_mode);
+ if (!mode) {
+ dev_err(panel->dev, "failed to add mode %ux%ux@%u\n",
+ tdo_y17pe_720x720_mode.hdisplay,
+ tdo_y17pe_720x720_mode.vdisplay,
+ drm_mode_vrefresh(&tdo_y17pe_720x720_mode));
+ 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 = 72;
+ connector->display_info.height_mm = 72;
+ drm_display_info_set_bus_formats(&connector->display_info,
+ &ctx->bus_format, 1);
+ connector->display_info.bus_flags = 0;
+
+ return 1;
+}
+
+static int tdo_y17p_prepare(struct drm_panel *panel)
+{
+ struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
+ int ret;
+
+ ret = regulator_enable(ctx->power);
+ if (ret)
+ return ret;
+
+ ret = tdo_y17p_write_msg(ctx, panel_init, NUM_INIT_REGS);
+
+ msleep(120);
+
+ return ret;
+}
+
+static int tdo_y17p_enable(struct drm_panel *panel)
+{
+ struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
+ const u16 msg[] = { MIPI_DCS_SET_DISPLAY_ON };
+ int ret;
+
+ ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));
+
+ return ret;
+}
+
+static int tdo_y17p_disable(struct drm_panel *panel)
+{
+ struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
+ const u16 msg[] = { MIPI_DCS_SET_DISPLAY_OFF };
+ int ret;
+
+ ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));
+
+ return ret;
+}
+
+static int tdo_y17p_unprepare(struct drm_panel *panel)
+{
+ struct tdo_y17p *ctx = panel_to_tdo_y17p(panel);
+ const u16 msg[] = { MIPI_DCS_ENTER_SLEEP_MODE };
+ int ret;
+
+ ret = tdo_y17p_write_msg(ctx, msg, ARRAY_SIZE(msg));
+
+ return ret;
+}
+
+static const struct drm_panel_funcs tdo_y17p_drm_funcs = {
+ .disable = tdo_y17p_disable,
+ .enable = tdo_y17p_enable,
+ .get_modes = tdo_y17p_get_modes,
+ .prepare = tdo_y17p_prepare,
+ .unprepare = tdo_y17p_unprepare,
+};
+
+static const struct of_device_id tdo_y17p_of_match[] = {
+ { .compatible = "tdo,tl040hds20ct",
+ .data = (void *)MEDIA_BUS_FMT_BGR888_1X24,
+ }, {
+ .compatible = "pimoroni,hyperpixel4square",
+ .data = (void *)MEDIA_BUS_FMT_BGR666_1X24_CPADHI,
+ }, {
+ .compatible = "tdo,y17p",
+ .data = (void *)MEDIA_BUS_FMT_BGR888_1X24,
+ }, {
+ /* sentinel */
+ }
+};
+MODULE_DEVICE_TABLE(of, tdo_y17p_of_match);
+
+static int tdo_y17p_probe(struct spi_device *spi)
+{
+ const struct of_device_id *id;
+ struct tdo_y17p *ctx;
+ int ret;
+
+ ctx = devm_kzalloc(&spi->dev, sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ id = of_match_node(tdo_y17p_of_match, spi->dev.of_node);
+ if (!id)
+ return -ENODEV;
+
+ ctx->bus_format = (u32)(uintptr_t)id->data;
+
+ spi_set_drvdata(spi, ctx);
+ ctx->spi = spi;
+
+ drm_panel_init(&ctx->panel, &spi->dev, &tdo_y17p_drm_funcs,
+ DRM_MODE_CONNECTOR_DPI);
+
+ ctx->power = devm_regulator_get(&spi->dev, "power");
+ if (IS_ERR(ctx->power))
+ return PTR_ERR(ctx->power);
+
+ ctx->reset = devm_gpiod_get_optional(&spi->dev, "reset", GPIOD_OUT_LOW);
+ if (IS_ERR(ctx->reset)) {
+ dev_err(&spi->dev, "Couldn't get our reset line\n");
+ return PTR_ERR(ctx->reset);
+ }
+
+ ret = drm_panel_of_backlight(&ctx->panel);
+ if (ret)
+ return ret;
+
+ drm_panel_add(&ctx->panel);
+
+ return 0;
+}
+
+static void tdo_y17p_remove(struct spi_device *spi)
+{
+ struct tdo_y17p *ctx = spi_get_drvdata(spi);
+
+ drm_panel_remove(&ctx->panel);
+}
+
+static const struct spi_device_id tdo_y17p_ids[] = {
+ { "tl040hds20ct", 0 },
+ { "hyperpixel4square", 0 },
+ { "y17p", 0 },
+ { /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(spi, tdo_y17p_ids);
+
+static struct spi_driver tdo_y17p_driver = {
+ .probe = tdo_y17p_probe,
+ .remove = tdo_y17p_remove,
+ .driver = {
+ .name = "tdo_y17p",
+ .of_match_table = tdo_y17p_of_match,
+ },
+ .id_table = tdo_y17p_ids,
+};
+module_spi_driver(tdo_y17p_driver);
+
+MODULE_AUTHOR("Dave Stevenson <dave.stevenson@raspberrypi.com>");
+MODULE_DESCRIPTION("TDO Y17P LCD panel driver");
+MODULE_LICENSE("GPL v2");
projects / platform / kernel / linux-rpi.git / commitdiff