From: dillon min dillon.minfei@gmail.com
This is a driver for 320x240 TFT panels, accepting a rgb input streams that get adapted and scaled to the panel.
Signed-off-by: dillon min dillon.minfei@gmail.com --- drivers/gpu/drm/panel/Kconfig | 8 + drivers/gpu/drm/panel/Makefile | 1 + drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 561 +++++++++++++++++++++++++++ 3 files changed, 570 insertions(+) create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig index a1723c1..e42692c 100644 --- a/drivers/gpu/drm/panel/Kconfig +++ b/drivers/gpu/drm/panel/Kconfig @@ -95,6 +95,14 @@ config DRM_PANEL_ILITEK_IL9322 Say Y here if you want to enable support for Ilitek IL9322 QVGA (320x240) RGB, YUV and ITU-T BT.656 panels.
+config DRM_PANEL_ILITEK_IL9341 + tristate "Ilitek ILI9341 240x320 QVGA panels" + depends on OF && SPI + select REGMAP + help + Say Y here if you want to enable support for Ilitek IL9341 + QVGA (240x320) RGB panels. + config DRM_PANEL_ILITEK_ILI9881C tristate "Ilitek ILI9881C-based panels" depends on OF diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile index 96a883c..d123543 100644 --- a/drivers/gpu/drm/panel/Makefile +++ b/drivers/gpu/drm/panel/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_DRM_PANEL_ELIDA_KD35T133) += panel-elida-kd35t133.o obj-$(CONFIG_DRM_PANEL_FEIXIN_K101_IM2BA02) += panel-feixin-k101-im2ba02.o obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o +obj-$(CONFIG_DRM_PANEL_ILITEK_IL9341) += panel-ilitek-ili9341.o obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o obj-$(CONFIG_DRM_PANEL_JDI_LT070ME05000) += panel-jdi-lt070me05000.o diff --git a/drivers/gpu/drm/panel/panel-ilitek-ili9341.c b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c new file mode 100644 index 0000000..ec22d80 --- /dev/null +++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c @@ -0,0 +1,561 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Ilitek ILI9341 TFT LCD drm_panel driver. + * + * This panel can be configured to support: + * - 16-bit parallel RGB interface + * + * Copyright (C) 2020 Dillon Min dillon.minfei@gmail.com + * Derived from drivers/drm/gpu/panel/panel-ilitek-ili9322.c + */ + +#include <linux/bitops.h> +#include <linux/gpio/consumer.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> + +#include <drm/drm_modes.h> +#include <drm/drm_panel.h> +#include <drm/drm_print.h> + +#define DEFAULT_SPI_SPEED 10000000 + +#define ILI9341_SLEEP_OUT 0x11 /* Sleep out register */ +#define ILI9341_GAMMA 0x26 /* Gamma register */ +#define ILI9341_DISPLAY_OFF 0x28 /* Display off register */ +#define ILI9341_DISPLAY_ON 0x29 /* Display on register */ +#define ILI9341_COLUMN_ADDR 0x2A /* Colomn address register */ +#define ILI9341_PAGE_ADDR 0x2B /* Page address register */ +#define ILI9341_GRAM 0x2C /* GRAM register */ +#define ILI9341_MAC 0x36 /* Memory Access Control register*/ +#define ILI9341_PIXEL_FORMAT 0x3A /* Pixel Format register */ +#define ILI9341_WDB 0x51 /* Write Brightness Display + * register + */ +#define ILI9341_WCD 0x53 /* Write Control Display + * register + */ +#define ILI9341_RGB_INTERFACE 0xB0 /* RGB Interface Signal Control */ +#define ILI9341_FRC 0xB1 /* Frame Rate Control register */ +#define ILI9341_BPC 0xB5 /* Blanking Porch Control + * register + */ +#define ILI9341_DFC 0xB6 /* Display Function Control + * register + */ +#define ILI9341_POWER1 0xC0 /* Power Control 1 register */ +#define ILI9341_POWER2 0xC1 /* Power Control 2 register */ +#define ILI9341_VCOM1 0xC5 /* VCOM Control 1 register */ +#define ILI9341_VCOM2 0xC7 /* VCOM Control 2 register */ +#define ILI9341_POWERA 0xCB /* Power control A register */ +#define ILI9341_POWERB 0xCF /* Power control B register */ +#define ILI9341_PGAMMA 0xE0 /* Positive Gamma Correction + * register + */ +#define ILI9341_NGAMMA 0xE1 /* Negative Gamma Correction + * register + */ +#define ILI9341_DTCA 0xE8 /* Driver timing control A */ +#define ILI9341_DTCB 0xEA /* Driver timing control B */ +#define ILI9341_POWER_SEQ 0xED /* Power on sequence register */ +#define ILI9341_3GAMMA_EN 0xF2 /* 3 Gamma enable register */ +#define ILI9341_INTERFACE 0xF6 /* Interface control register */ +#define ILI9341_PRC 0xF7 /* Pump ratio control register */ + +static u8 ili9341_cmd0[] = {0xc3, 0x08, 0x50}; +static u8 ili9341_powerb[] = {0x00, 0xc1, 0x30}; +static u8 ili9341_power_seq[] = {0x64, 0x03, 0x12, 0x81}; +static u8 ili9341_dtca[] = {0x85, 0x00, 0x78}; +static u8 ili9341_powera[] = {0x39, 0x2c, 0x00, 0x34, 0x02}; +static u8 ili9341_prc[] = {0x20}; +static u8 ili9341_dtcb[] = {0x00, 0x00}; +static u8 ili9341_frc[] = {0x00, 0x1b}; +static u8 ili9341_dfc1[] = {0x0a, 0xa2}; +static u8 ili9341_power1[] = {0x10}; +static u8 ili9341_power2[] = {0x10}; +static u8 ili9341_vcom1[] = {0x45, 0x15}; +static u8 ili9341_vcom2[] = {0x90}; +static u8 ili9341_mac[] = {0xc8}; +static u8 ili9341_gamma_en[] = {0x00}; +static u8 ili9341_rgb_intr[] = {0xc2}; +static u8 ili9341_dfc2[] = {0x0a, 0xa7, 0x27, 0x04}; +static u8 ili9341_column_addr[] = {0x00, 0x00, 0x00, 0xef}; +static u8 ili9341_page_addr[] = {0x00, 0x00, 0x01, 0x3f}; +static u8 ili9341_intr[] = {0x01, 0x00, 0x06}; +static u8 ili9341_gamma[] = {0x01}; +static u8 ili9341_pgamma[] = {0x0f, 0x29, 0x24, 0x0c, 0x0e, 0x09, 0x4e, 0x78, + 0x3c, 0x09, 0x13, 0x05, 0x17, 0x11, 0x00}; +static u8 ili9341_ngamma[] = {0x00, 0x16, 0x1b, 0x04, 0x11, 0x07, 0x31, 0x33, + 0x42, 0x05, 0x0c, 0x0a, 0x28, 0x2f, 0x0f}; + +/** + * enum ili9341_input - the format of the incoming signal to the panel + * + * The panel can be connected to various input streams and four of them can + * be selected by electronic straps on the display. However it is possible + * to select another mode or override the electronic default with this + * setting. + */ +enum ili9341_input { + ILI9341_INPUT_PRGB_THROUGH = 0x0, + ILI9341_INPUT_PRGB_ALIGNED = 0x1, + ILI9341_INPUT_UNKNOWN = 0xf, +}; + +/** + * struct ili9341_config - the system specific ILI9341 configuration + * @width_mm: physical panel width [mm] + * @height_mm: physical panel height [mm] + * @input: the input/entry type used in this system, if this is set to + * ILI9341_INPUT_UNKNOWN the driver will try to figure it out by probing + * the hardware + * @dclk_active_high: data/pixel clock active high, data will be clocked + * in on the rising edge of the DCLK (this is usually the case). + * @de_active_high: DE (data entry) is active high + * @hsync_active_high: HSYNC is active high + * @vsync_active_high: VSYNC is active high + */ +struct ili9341_config { + u32 width_mm; + u32 height_mm; + enum ili9341_input input; + bool dclk_active_high; + bool de_active_high; + bool hsync_active_high; + bool vsync_active_high; +}; + +struct ili9341 { + struct device *dev; + const struct ili9341_config *conf; + struct drm_panel panel; + struct regmap *regmap; + struct gpio_desc *reset_gpio; + struct gpio_desc *dc_gpio; + enum ili9341_input input; + struct videomode vm; +}; + +static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel) +{ + return container_of(panel, struct ili9341, panel); +} + +int ili9341_spi_transfer(struct spi_device *spi, u32 speed_hz, + u8 bpw, const void *buf, size_t len) +{ + size_t max_chunk = spi_max_transfer_size(spi); + struct spi_transfer tr = { + .bits_per_word = bpw, + .speed_hz = speed_hz, + .len = len, + }; + struct spi_message m; + size_t chunk; + int ret; + + spi_message_init_with_transfers(&m, &tr, 1); + + while (len) { + chunk = min(len, max_chunk); + + tr.tx_buf = buf; + tr.len = chunk; + buf += chunk; + len -= chunk; + + ret = spi_sync(spi, &m); + if (ret) + return ret; + } + return 0; +} +static int ili9341_regmap_spi_write(void *context, const void *data, + size_t count) +{ + struct device *dev = context; + struct spi_device *spi = to_spi_device(dev); + struct ili9341 *ili = spi_get_drvdata(spi); + int ret = 0; + + gpiod_set_value_cansleep(ili->dc_gpio, 0); + + ret = ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+0, 1); + if (ret || count == 1 || + ((u8 *)data)[0] == ILI9341_GRAM || + ((u8 *)data)[0] == ILI9341_DISPLAY_ON || + ((u8 *)data)[0] == ILI9341_SLEEP_OUT || + ((u8 *)data)[0] == ILI9341_DISPLAY_OFF) + return ret; + + gpiod_set_value_cansleep(ili->dc_gpio, 1); + + return ili9341_spi_transfer(spi, DEFAULT_SPI_SPEED, 8, data+1, count-1); +} + +static int ili9341_regmap_spi_read(void *context, const void *reg, + size_t reg_size, void *val, size_t val_size) +{ + return 0; +} + +static struct regmap_bus ili9341_regmap_bus = { + .write = ili9341_regmap_spi_write, + .read = ili9341_regmap_spi_read, + .reg_format_endian_default = REGMAP_ENDIAN_BIG, + .val_format_endian_default = REGMAP_ENDIAN_BIG, +}; + +static bool ili9341_volatile_reg(struct device *dev, unsigned int reg) +{ + return false; +} + +static bool ili9341_writeable_reg(struct device *dev, unsigned int reg) +{ + /* Just register 0 is read-only */ + if (reg == 0x00) + return false; + return true; +} + +static const struct regmap_config ili9341_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = 0xff, + .cache_type = REGCACHE_RBTREE, + .volatile_reg = ili9341_volatile_reg, + .writeable_reg = ili9341_writeable_reg, +}; + +static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili) +{ + regmap_bulk_write(ili->regmap, 0xca, + ili9341_cmd0, sizeof(ili9341_cmd0)); + regmap_bulk_write(ili->regmap, ILI9341_POWERB, + ili9341_powerb, sizeof(ili9341_powerb)); + regmap_bulk_write(ili->regmap, ILI9341_POWER_SEQ, + ili9341_power_seq, sizeof(ili9341_power_seq)); + regmap_bulk_write(ili->regmap, ILI9341_DTCA, + ili9341_dtca, sizeof(ili9341_dtca)); + regmap_bulk_write(ili->regmap, ILI9341_POWERA, + ili9341_powera, sizeof(ili9341_powera)); + regmap_write(ili->regmap, ILI9341_PRC, ili9341_prc[0]); + regmap_bulk_write(ili->regmap, ILI9341_DTCB, + ili9341_dtcb, sizeof(ili9341_dtcb)); + regmap_bulk_write(ili->regmap, ILI9341_FRC, + ili9341_frc, sizeof(ili9341_frc)); + regmap_bulk_write(ili->regmap, ILI9341_DFC, + ili9341_dfc1, sizeof(ili9341_dfc1)); + regmap_write(ili->regmap, ILI9341_POWER1, ili9341_power1[0]); + regmap_write(ili->regmap, ILI9341_POWER2, ili9341_power2[0]); + regmap_bulk_write(ili->regmap, ILI9341_VCOM1, + ili9341_vcom1, sizeof(ili9341_vcom1)); + regmap_write(ili->regmap, ILI9341_VCOM2, ili9341_vcom2[0]); + regmap_write(ili->regmap, ILI9341_MAC, ili9341_mac[0]); + regmap_write(ili->regmap, ILI9341_3GAMMA_EN, ili9341_gamma_en[0]); + regmap_write(ili->regmap, ILI9341_RGB_INTERFACE, ili9341_rgb_intr[0]); + regmap_bulk_write(ili->regmap, ILI9341_DFC, + ili9341_dfc2, sizeof(ili9341_dfc2)); + + /* colomn address set */ + regmap_bulk_write(ili->regmap, ILI9341_COLUMN_ADDR, + ili9341_column_addr, sizeof(ili9341_column_addr)); + + /* Page Address Set */ + regmap_bulk_write(ili->regmap, ILI9341_PAGE_ADDR, + ili9341_page_addr, sizeof(ili9341_page_addr)); + regmap_bulk_write(ili->regmap, ILI9341_INTERFACE, + ili9341_intr, sizeof(ili9341_intr)); + regmap_write(ili->regmap, ILI9341_GRAM, 0); + msleep(200); + + regmap_write(ili->regmap, ILI9341_GAMMA, ili9341_gamma[0]); + regmap_bulk_write(ili->regmap, ILI9341_PGAMMA, + ili9341_pgamma, sizeof(ili9341_pgamma)); + regmap_bulk_write(ili->regmap, ILI9341_NGAMMA, + ili9341_ngamma, sizeof(ili9341_ngamma)); + regmap_write(ili->regmap, ILI9341_SLEEP_OUT, 0); + msleep(200); + + regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0); + + /* GRAM start writing */ + regmap_write(ili->regmap, ILI9341_GRAM, 0); + + dev_info(ili->dev, "initialized display\n"); + + return 0; +} + +/* + * This power-on sequence if from the datasheet, page 57. + */ +static int ili9341_power_on(struct ili9341 *ili) +{ + /* Assert RESET */ + gpiod_set_value(ili->reset_gpio, 1); + + msleep(20); + + /* De-assert RESET */ + gpiod_set_value(ili->reset_gpio, 0); + + msleep(10); + + return 0; +} + +static int ili9341_power_off(struct ili9341 *ili) +{ + return 0; +} + +static int ili9341_disable(struct drm_panel *panel) +{ + struct ili9341 *ili = panel_to_ili9341(panel); + int ret; + + ret = regmap_write(ili->regmap, ILI9341_DISPLAY_OFF, 0); + if (ret) { + dev_err(ili->dev, "unable to go to standby mode\n"); + return ret; + } + + return 0; +} + +static int ili9341_unprepare(struct drm_panel *panel) +{ + struct ili9341 *ili = panel_to_ili9341(panel); + + return ili9341_power_off(ili); +} + +static int ili9341_prepare(struct drm_panel *panel) +{ + struct ili9341 *ili = panel_to_ili9341(panel); + int ret; + + ret = ili9341_power_on(ili); + if (ret < 0) + return ret; + + ret = ili9341_init(panel, ili); + if (ret < 0) + ili9341_unprepare(panel); + + return ret; +} + +static int ili9341_enable(struct drm_panel *panel) +{ + struct ili9341 *ili = panel_to_ili9341(panel); + int ret; + + ret = regmap_write(ili->regmap, ILI9341_DISPLAY_ON, 0); + if (ret) { + dev_err(ili->dev, "unable to enable panel\n"); + return ret; + } + + return 0; +} + +/* This is the only mode listed for parallel RGB in the datasheet */ +static const struct drm_display_mode prgb_320x240_mode = { + .clock = 6100, + .hdisplay = 240, + .hsync_start = 240 + 10, + .hsync_end = 240 + 10 + 10, + .htotal = 280, + .vdisplay = 320, + .vsync_start = 320 + 4, + .vsync_end = 320 + 4 + 2, + .vtotal = 328, + .vrefresh = 60, + .flags = 0, +}; + +static int ili9341_get_modes(struct drm_panel *panel, + struct drm_connector *connector) +{ + struct ili9341 *ili = panel_to_ili9341(panel); + struct drm_device *drm = connector->dev; + struct drm_display_mode *mode; + struct drm_display_info *info; + + info = &connector->display_info; + info->width_mm = ili->conf->width_mm; + info->height_mm = ili->conf->height_mm; + if (ili->conf->dclk_active_high) + info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE; + else + info->bus_flags |= DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE; + + if (ili->conf->de_active_high) + info->bus_flags |= DRM_BUS_FLAG_DE_HIGH; + else + info->bus_flags |= DRM_BUS_FLAG_DE_LOW; + + switch (ili->input) { + case ILI9341_INPUT_PRGB_THROUGH: + case ILI9341_INPUT_PRGB_ALIGNED: + mode = drm_mode_duplicate(drm, &prgb_320x240_mode); + break; + default: + mode = NULL; + break; + } + if (!mode) { + DRM_ERROR("bad mode or failed to add mode\n"); + return -EINVAL; + } + drm_mode_set_name(mode); + /* + * This is the preferred mode because most people are going + * to want to use the display with VGA type graphics. + */ + mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; + + /* Set up the polarity */ + if (ili->conf->hsync_active_high) + mode->flags |= DRM_MODE_FLAG_PHSYNC; + else + mode->flags |= DRM_MODE_FLAG_NHSYNC; + if (ili->conf->vsync_active_high) + mode->flags |= DRM_MODE_FLAG_PVSYNC; + else + mode->flags |= DRM_MODE_FLAG_NVSYNC; + + mode->width_mm = ili->conf->width_mm; + mode->height_mm = ili->conf->height_mm; + drm_mode_probed_add(connector, mode); + + return 1; /* Number of modes */ +} + +static const struct drm_panel_funcs ili9341_drm_funcs = { + .disable = ili9341_disable, + .unprepare = ili9341_unprepare, + .prepare = ili9341_prepare, + .enable = ili9341_enable, + .get_modes = ili9341_get_modes, +}; + +static int ili9341_probe(struct spi_device *spi) +{ + struct device *dev = &spi->dev; + struct ili9341 *ili; + const struct regmap_config *regmap_config; + int ret; + + ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL); + if (!ili) + return -ENOMEM; + + spi_set_drvdata(spi, ili); + + ili->dev = dev; + /* + * Every new incarnation of this display must have a unique + * data entry for the system in this driver. + */ + ili->conf = of_device_get_match_data(dev); + if (!ili->conf) { + dev_err(dev, "missing device configuration\n"); + return -ENODEV; + } + + ili->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(ili->reset_gpio)) { + dev_err(dev, "failed to get RESET GPIO\n"); + return PTR_ERR(ili->reset_gpio); + } + + ili->dc_gpio = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW); + if (IS_ERR(ili->dc_gpio)) { + dev_err(dev, "failed to get DC GPIO\n"); + return PTR_ERR(ili->dc_gpio); + } + + spi->bits_per_word = 8; + ret = spi_setup(spi); + if (ret < 0) { + dev_err(dev, "spi setup failed.\n"); + return ret; + } + + regmap_config = &ili9341_regmap_config; + + ili->regmap = devm_regmap_init(dev, &ili9341_regmap_bus, dev, + regmap_config); + if (IS_ERR(ili->regmap)) { + dev_err(dev, "failed to allocate register map\n"); + return PTR_ERR(ili->regmap); + } + + ili->input = ili->conf->input; + + drm_panel_init(&ili->panel, dev, &ili9341_drm_funcs, + DRM_MODE_CONNECTOR_DPI); + + return drm_panel_add(&ili->panel); +} + +static int ili9341_remove(struct spi_device *spi) +{ + struct ili9341 *ili = spi_get_drvdata(spi); + + ili9341_power_off(ili); + drm_panel_remove(&ili->panel); + + return 0; +} + +/* + * The Stm32f429-disco board has a panel ili9341 connected to ltdc controller + */ +static const struct ili9341_config ili9341_data = { + .width_mm = 65, + .height_mm = 50, + .input = ILI9341_INPUT_PRGB_THROUGH, + .dclk_active_high = true, + .de_active_high = false, + .hsync_active_high = false, + .vsync_active_high = false, +}; + +static const struct of_device_id ili9341_of_match[] = { + { + .compatible = "stm32f429,ltdc-panel", + .data = &ili9341_data, + }, + { + .compatible = "ilitek,ili9341", + .data = NULL, + }, + { } +}; +MODULE_DEVICE_TABLE(of, ili9341_of_match); + +static struct spi_driver ili9341_driver = { + .probe = ili9341_probe, + .remove = ili9341_remove, + .driver = { + .name = "panel-ilitek-ili9341", + .of_match_table = ili9341_of_match, + }, +}; +module_spi_driver(ili9341_driver); + +MODULE_AUTHOR("Dillon Min dillon.minfei@gmail.com"); +MODULE_DESCRIPTION("ILI9341 LCD panel driver"); +MODULE_LICENSE("GPL v2");