video: panel: add LG LG070WX3 MIPI DSI panel driver

The LD070WX3 is a Color Active Matrix Liquid Crystal Display with
an integral Light Emitting Diode (LED) backlight system. The
matrix employs a-Si Thin Film Transistor as the active element. It
is a transmissive type display operating in the normally Black
mode. This TFT-LCD has 7.0 inches diagonally measured active
display area with WXGA resolution (800 by 1280 pixel array).

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 39c82521be1613813e47579c43c9c98625c7011b..742ea6edee6672061801d3dde48f5ae466449968 100644 (file)
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -522,6 +522,14 @@ config VIDEO_LCD_ORISETECH_OTM8009A
        Say Y here if you want to enable support for Orise Technology
        otm8009a 480x800 dsi 2dl panel.
 
+config VIDEO_LCD_LG_LD070WX3
+       bool "LD070WX3 DSI LCD panel support"
+       depends on PANEL && BACKLIGHT
+       select VIDEO_MIPI_DSI
+       help
+         Say Y here if you want to enable support for LG LD070WX3
+         800x1280 DSI video mode panel.
+
 config VIDEO_LCD_RAYDIUM_RM68200
        bool "RM68200 DSI LCD panel support"
        select VIDEO_MIPI_DSI

diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index fdc293763242735fab8202d62a6fe0f31fe24ef6..bb6d9b74b93f4440d855ff5b04d879433b0ed516 100644 (file)
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -58,6 +58,7 @@ obj-$(CONFIG_VIDEO_LCD_ANX9804) += anx9804.o
 obj-$(CONFIG_VIDEO_LCD_ENDEAVORU) += endeavoru-panel.o
 obj-$(CONFIG_VIDEO_LCD_HIMAX_HX8394) += himax-hx8394.o
 obj-$(CONFIG_VIDEO_LCD_HITACHI_TX18D42VM) += hitachi_tx18d42vm_lcd.o
+obj-$(CONFIG_VIDEO_LCD_LG_LD070WX3) += lg-ld070wx3.o
 obj-$(CONFIG_VIDEO_LCD_ORISETECH_OTM8009A) += orisetech_otm8009a.o
 obj-$(CONFIG_VIDEO_LCD_RAYDIUM_RM68200) += raydium-rm68200.o
 obj-$(CONFIG_VIDEO_LCD_RENESAS_R61307) += renesas-r61307.o

diff --git a/drivers/video/lg-ld070wx3.c b/drivers/video/lg-ld070wx3.c
new file mode 100644 (file)
index 0000000..610a06f
--- /dev/null
+++ b/drivers/video/lg-ld070wx3.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * LG LD070WX3-SL01 DSI panel driver
+ *
+ * Copyright (c) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <backlight.h>
+#include <dm.h>
+#include <panel.h>
+#include <log.h>
+#include <mipi_dsi.h>
+#include <linux/delay.h>
+#include <power/regulator.h>
+
+struct lg_ld070wx3_priv {
+       struct udevice *vdd;
+       struct udevice *vcc;
+
+       struct udevice *backlight;
+};
+
+static struct display_timing default_timing = {
+       .pixelclock.typ         = 70000000,
+       .hactive.typ            = 800,
+       .hfront_porch.typ       = 32,
+       .hback_porch.typ        = 48,
+       .hsync_len.typ          = 8,
+       .vactive.typ            = 1280,
+       .vfront_porch.typ       = 5,
+       .vback_porch.typ        = 3,
+       .vsync_len.typ          = 1,
+};
+
+static void dcs_write_one(struct mipi_dsi_device *dsi, u8 cmd, u8 data)
+{
+       mipi_dsi_dcs_write(dsi, cmd, &data, 1);
+}
+
+static int lg_ld070wx3_enable_backlight(struct udevice *dev)
+{
+       struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+       struct mipi_dsi_device *dsi = plat->device;
+       int ret;
+
+       ret = mipi_dsi_dcs_soft_reset(dsi);
+       if (ret < 0) {
+               log_debug("%s: failed to soft reset panel: %d\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       /* Delay before sending new command after soft reset */
+       mdelay(20);
+
+       /* Differential input impedance selection */
+       dcs_write_one(dsi, 0xAE, 0x0B);
+
+       /* Enter test mode 1 and 2*/
+       dcs_write_one(dsi, 0xEE, 0xEA);
+       dcs_write_one(dsi, 0xEF, 0x5F);
+
+       /* Increased MIPI CLK driving ability */
+       dcs_write_one(dsi, 0xF2, 0x68);
+
+       /* Exit test mode 1 and 2 */
+       dcs_write_one(dsi, 0xEE, 0x00);
+       dcs_write_one(dsi, 0xEF, 0x00);
+
+       return 0;
+}
+
+static int lg_ld070wx3_set_backlight(struct udevice *dev, int percent)
+{
+       struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
+       int ret;
+
+       ret = backlight_enable(priv->backlight);
+       if (ret)
+               return ret;
+
+       return backlight_set_brightness(priv->backlight, percent);
+}
+
+static int lg_ld070wx3_timings(struct udevice *dev,
+                              struct display_timing *timing)
+{
+       memcpy(timing, &default_timing, sizeof(*timing));
+       return 0;
+}
+
+static int lg_ld070wx3_of_to_plat(struct udevice *dev)
+{
+       struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
+       int ret;
+
+       ret = uclass_get_device_by_phandle(UCLASS_PANEL_BACKLIGHT, dev,
+                                          "backlight", &priv->backlight);
+       if (ret) {
+               log_debug("%s: cannot get backlight: ret = %d\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
+                                          "vdd-supply", &priv->vdd);
+       if (ret) {
+               log_debug("%s: cannot get vdd-supply: ret = %d\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
+                                          "vcc-supply", &priv->vcc);
+       if (ret) {
+               log_debug("%s: cannot get vcc-supply: ret = %d\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int lg_ld070wx3_hw_init(struct udevice *dev)
+{
+       struct lg_ld070wx3_priv *priv = dev_get_priv(dev);
+       int ret;
+
+       ret = regulator_set_enable_if_allowed(priv->vcc, 1);
+       if (ret) {
+               log_debug("%s: enabling vcc-supply failed (%d)\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       ret = regulator_set_enable_if_allowed(priv->vdd, 1);
+       if (ret) {
+               log_debug("%s: enabling vdd-supply failed (%d)\n",
+                         __func__, ret);
+               return ret;
+       }
+
+       /*
+        * According to spec delay between enabling supply is 0,
+        * for regulators to reach required voltage ~5ms needed.
+        * MIPI interface signal for setup requires additional
+        * 110ms which in total results in 115ms.
+        */
+       mdelay(115);
+
+       return 0;
+}
+
+static int lg_ld070wx3_probe(struct udevice *dev)
+{
+       struct mipi_dsi_panel_plat *plat = dev_get_plat(dev);
+
+       /* fill characteristics of DSI data link */
+       plat->lanes = 4;
+       plat->format = MIPI_DSI_FMT_RGB888;
+       plat->mode_flags = MIPI_DSI_MODE_VIDEO;
+
+       return lg_ld070wx3_hw_init(dev);
+}
+
+static const struct panel_ops lg_ld070wx3_ops = {
+       .enable_backlight       = lg_ld070wx3_enable_backlight,
+       .set_backlight          = lg_ld070wx3_set_backlight,
+       .get_display_timing     = lg_ld070wx3_timings,
+};
+
+static const struct udevice_id lg_ld070wx3_ids[] = {
+       { .compatible = "lg,ld070wx3-sl01" },
+       { }
+};
+
+U_BOOT_DRIVER(lg_ld070wx3) = {
+       .name           = "lg_ld070wx3",
+       .id             = UCLASS_PANEL,
+       .of_match       = lg_ld070wx3_ids,
+       .ops            = &lg_ld070wx3_ops,
+       .of_to_plat     = lg_ld070wx3_of_to_plat,
+       .probe          = lg_ld070wx3_probe,
+       .plat_auto      = sizeof(struct mipi_dsi_panel_plat),
+       .priv_auto      = sizeof(struct lg_ld070wx3_priv),
+};