[PATCH 1/2] drm/panel: Add Ilitek ILI9341 parallel RGB panel driver
Josef Lusticky
josef at lusticky.cz
Tue Feb 19 13:21:00 UTC 2019
---
MAINTAINERS | 6 +
drivers/gpu/drm/panel/Kconfig | 7 +
drivers/gpu/drm/panel/Makefile | 1 +
drivers/gpu/drm/panel/panel-ilitek-ili9341.c | 320 +++++++++++++++++++
4 files changed, 334 insertions(+)
create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
diff --git a/MAINTAINERS b/MAINTAINERS
index df5668bc1c88..ec366473174b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4800,6 +4800,12 @@ S: Maintained
F: drivers/gpu/drm/tinydrm/ili9225.c
F: Documentation/devicetree/bindings/display/ilitek,ili9225.txt
+DRM DRIVER FOR ILITEK ILI9341 PANELS
+M: Josef Lusticky <josef at lusticky.cz>
+S: Maintained
+F: drivers/gpu/drm/panel/panel-ilitek-ili9341.c
+F: Documentation/devicetree/bindings/display/panel/ilitek,ili9341.txt
+
DRM DRIVER FOR HX8357D PANELS
M: Eric Anholt <eric at anholt.net>
T: git git://anongit.freedesktop.org/drm/drm-misc
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3e070153ef21..0e2ceea5009a 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -46,6 +46,13 @@ 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 panels"
+ depends on OF && SPI
+ help
+ Say Y here if you want to enable support for Ilitek IL9341
+ QVGA (240x320) RGB panel.
+
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 e7ab71968bbf..1df564018bc4 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
obj-$(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 000000000000..51ed03140f8d
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-ilitek-ili9341.c
@@ -0,0 +1,320 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Ilitek ILI9341 drm_panel driver
+ * 240RGBx320 dots resolution TFT LCD display
+ *
+ * This driver support the following panel configurations:
+ * - 18-bit parallel RGB interface
+ * - 8-bit SPI with Data/Command GPIO
+ *
+ * Copyright (C) 2019 Josef Lusticky <josef at lusticky.cz>
+ *
+ */
+
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+
+/* ILI9341 extended register set */
+#define ILI9341_IFMODE 0xB0 // clock polarity
+#define ILI9341_IFCTL 0xF6 // interface conrol
+#define ILI9341_PGAMCTRL 0xE0 // positive gamma control
+#define ILI9341_NGAMCTRL 0xE1 // negative gamma control
+
+#define ILI9341_MADCTL_MV BIT(5)
+#define ILI9341_MADCTL_MX BIT(6)
+#define ILI9341_MADCTL_MY BIT(7)
+
+/**
+ * struct ili9341_config - the display specific configuration
+ * @width_mm: physical panel width [mm]
+ * @height_mm: physical panel height [mm]
+ */
+struct ili9341_config {
+ u32 width_mm;
+ u32 height_mm;
+};
+
+struct ili9341 {
+ const struct ili9341_config *conf;
+ struct drm_panel panel;
+ struct spi_device *spi;
+ struct backlight_device *backlight;
+ struct gpio_desc *dc_gpio;
+ struct gpio_desc *reset_gpio;
+};
+
+static inline struct ili9341 *panel_to_ili9341(struct drm_panel *panel)
+{
+ return container_of(panel, struct ili9341, panel);
+}
+
+static int ili9341_spi_write_command(struct ili9341 *ili, u8 cmd)
+{
+ struct spi_transfer xfer = {
+ .tx_buf = &cmd,
+ .bits_per_word = 8,
+ .len = 1
+ };
+ struct spi_message msg;
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ gpiod_set_value(ili->dc_gpio, 0);
+
+ return spi_sync(ili->spi, &msg);
+}
+
+static int ili9341_spi_write_data(struct ili9341 *ili, u8 *data, size_t size)
+{
+ struct spi_transfer xfer = {
+ .tx_buf = data,
+ .bits_per_word = 8,
+ .len = size
+ };
+
+ struct spi_message msg;
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfer, &msg);
+
+ gpiod_set_value(ili->dc_gpio, 1);
+
+ return spi_sync(ili->spi, &msg);
+}
+
+#define ili9341_spi_write(ili, cmd, data...) \
+({ \
+ u8 d[] = { data }; \
+ ili9341_spi_write_command(ili, cmd); \
+ if (ARRAY_SIZE(d) > 0) \
+ ili9341_spi_write_data(ili, d, ARRAY_SIZE(d)); \
+})
+
+static int ili9341_deinit(struct drm_panel *panel, struct ili9341 *ili)
+{
+ ili9341_spi_write(ili, MIPI_DCS_SET_DISPLAY_OFF);
+ ili9341_spi_write(ili, MIPI_DCS_ENTER_SLEEP_MODE);
+ msleep(5);
+ return 0;
+}
+
+static int ili9341_init(struct drm_panel *panel, struct ili9341 *ili)
+{
+ /* HW / SW Reset display and wait */
+ if (ili->reset_gpio) {
+ gpiod_set_value(ili->reset_gpio, 0);
+ usleep_range(20, 1000);
+ gpiod_set_value(ili->reset_gpio, 1);
+ } else {
+ ili9341_spi_write(ili, MIPI_DCS_SOFT_RESET);
+ }
+ msleep(120);
+
+ /* Polarity */
+ ili9341_spi_write(ili, ILI9341_IFMODE, 0xC0);
+
+ /* Interface control */
+ ili9341_spi_write(ili, ILI9341_IFCTL, 0x09, 0x01, 0x26);
+
+ /* Pixel format */
+ ili9341_spi_write(ili, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_18BIT << 4);
+
+ /* Gamma */
+ ili9341_spi_write(ili, MIPI_DCS_SET_GAMMA_CURVE, 0x01);
+ ili9341_spi_write(ili, ILI9341_PGAMCTRL,
+ 0x0f, 0x31, 0x2b, 0x0c, 0x0e, 0x08, 0x4e, 0xf1,
+ 0x37, 0x07, 0x10, 0x03, 0x0e, 0x09, 0x00);
+ ili9341_spi_write(ili, ILI9341_NGAMCTRL,
+ 0x00, 0x0e, 0x14, 0x03, 0x11, 0x07, 0x31, 0xc1,
+ 0x48, 0x08, 0x0f, 0x0c, 0x31, 0x36, 0x0f);
+
+ /* Rotation */
+ ili9341_spi_write(ili, MIPI_DCS_SET_ADDRESS_MODE, ILI9341_MADCTL_MX);
+
+ /* Exit sleep mode */
+ ili9341_spi_write(ili, MIPI_DCS_EXIT_SLEEP_MODE);
+ msleep(120);
+
+ ili9341_spi_write(ili, MIPI_DCS_SET_DISPLAY_ON);
+
+ return 0;
+}
+
+static int ili9341_unprepare(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ return ili9341_deinit(panel, ili);
+}
+
+static int ili9341_prepare(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ int 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);
+ return backlight_enable(ili->backlight);
+}
+
+static int ili9341_disable(struct drm_panel *panel)
+{
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ return backlight_disable(ili->backlight);
+}
+
+static const struct drm_display_mode prgb_240x320_mode = {
+ .clock = 6350,
+
+ .hdisplay = 240,
+ .hsync_start = 240 + 10,
+ .hsync_end = 240 + 10 + 10,
+ .htotal = 240 + 10 + 10 + 20,
+
+ .vdisplay = 320,
+ .vsync_start = 320 + 4,
+ .vsync_end = 320 + 4 + 2,
+ .vtotal = 320 + 4 + 2 + 2,
+
+ .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+ .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED
+};
+
+static int ili9341_get_modes(struct drm_panel *panel)
+{
+ struct drm_connector *connector = panel->connector;
+ struct ili9341 *ili = panel_to_ili9341(panel);
+ struct drm_display_mode *mode;
+
+ mode = drm_mode_duplicate(panel->drm, &prgb_240x320_mode);
+ drm_mode_set_name(mode);
+
+ mode->width_mm = ili->conf->width_mm;
+ mode->height_mm = ili->conf->height_mm;
+
+ strncpy(connector->display_info.name, "ILI9341 TFT LCD driver\0",
+ DRM_DISPLAY_INFO_LEN);
+ connector->display_info.width_mm = mode->width_mm;
+ connector->display_info.height_mm = mode->height_mm;
+ connector->display_info.bus_flags |= DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_POSEDGE |
+ DRM_BUS_FLAG_SYNC_NEGEDGE;
+
+ 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;
+ int ret;
+
+ ili = devm_kzalloc(dev, sizeof(struct ili9341), GFP_KERNEL);
+ if (!ili)
+ return -ENOMEM;
+
+ spi_set_drvdata(spi, ili);
+
+ ili->spi = spi;
+
+ /*
+ * 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) {
+ DRM_DEV_ERROR(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)) {
+ DRM_DEV_ERROR(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)) {
+ DRM_DEV_ERROR(dev, "failed to get dc gpio\n");
+ return PTR_ERR(ili->dc_gpio);
+ }
+
+ ili->backlight = devm_of_find_backlight(dev);
+ if (IS_ERR(ili->backlight)) {
+ DRM_DEV_ERROR(dev, "failed to get backlight\n");
+ return PTR_ERR(ili->backlight);
+ }
+
+ ret = spi_setup(spi);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "spi setup failed\n");
+ return ret;
+ }
+
+ drm_panel_init(&ili->panel);
+ ili->panel.dev = dev;
+ ili->panel.funcs = &ili9341_drm_funcs;
+
+ return drm_panel_add(&ili->panel);
+}
+
+static int ili9341_remove(struct spi_device *spi)
+{
+ struct ili9341 *ili = spi_get_drvdata(spi);
+
+ drm_panel_remove(&ili->panel);
+
+ ili9341_disable(&ili->panel);
+ ili9341_unprepare(&ili->panel);
+
+ return 0;
+}
+
+static const struct ili9341_config dt024ctft_data = {
+ .width_mm = 37,
+ .height_mm = 49,
+};
+
+static const struct of_device_id ili9341_of_match[] = {
+ { .compatible = "displaytech,dt024ctft", .data = &dt024ctft_data },
+ { }
+};
+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("Josef Lusticky <josef at lusticky.cz>");
+MODULE_DESCRIPTION("ILI9341 LCD panel driver");
+MODULE_LICENSE("GPL");
--
2.20.1
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