* SPI based initialization for HX8238D
* Resolution: 320x240
* Available Color-Modes: RGB/BGR
Example for DT-Binding in *-u-boot.dtsi
&spi0 {
lcd0: display@0 {
compatible = "himax,hx8238d";
pinctrl-names = "default";
pinctrl-0 = <&lcd0_pins>;
reg = <0>;
label = "lcd";
spi-max-frequency = <100000>;
};
};
* Derived from the work done by Sjoerd Simons
https://gitlab.apertis.org/packaging/u-boot/-/blob\
/5f259720e3e64965d50da89a841ad6eb256a47df/debian/patches\
/apertis/powertools/0005-video-Add-Himax-HX8238-D-driver.patch
* Tested on Bosch Guardian Board
Cc: Sjoerd Simons <sjoerd.sim...@collabora.co.uk>
Signed-off-by: Moses Christopher <bollavarapumoses.christop...@in.bosch.com>
---
drivers/video/Kconfig | 10 ++
drivers/video/Makefile | 1 +
drivers/video/hx8238d.c | 196 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 207 insertions(+)
create mode 100644 drivers/video/hx8238d.c
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index 7c5012a67f..90b2fb0ec2 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -113,6 +113,16 @@ config CONSOLE_TRUETYPE
With this option you can adjust the text size and use a variety of
fonts. Note that this is noticeably slower than with normal console.
+config DM_PANEL_HX8238D
+ bool "Enable Himax HX-8238D LCD driver"
+ depends on DM_VIDEO
+ help
+ Support for HX-8238D LCD Panel Initialization using SPI.
+ The HX8238-D is a single chip controller and driver LSI that
+ integrates the power circuit.
+ It can drive a maximum 960x240 dot graphics on a-TFT panel
+ displays in 16M colors with dithering.
+
config CONSOLE_TRUETYPE_SIZE
int "TrueType font size"
depends on CONSOLE_TRUETYPE
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index df7119d62a..2b5f2c9cbc 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_DISPLAY) += display-uclass.o
obj-$(CONFIG_DM_VIDEO) += backlight-uclass.o
obj-$(CONFIG_VIDEO_MIPI_DSI) += dsi-host-uclass.o
obj-$(CONFIG_DM_VIDEO) += panel-uclass.o simple_panel.o
+obj-$(CONFIG_DM_PANEL_HX8238D) += hx8238d.o
obj-$(CONFIG_DM_VIDEO) += video-uclass.o vidconsole-uclass.o
obj-$(CONFIG_DM_VIDEO) += video_bmp.o
endif
diff --git a/drivers/video/hx8238d.c b/drivers/video/hx8238d.c
new file mode 100644
index 0000000000..9197826360
--- /dev/null
+++ b/drivers/video/hx8238d.c
@@ -0,0 +1,196 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copied from simple-panel
+ * Copyright (c) 2016 Google, Inc
+ * Written by Simon Glass <s...@chromium.org>
+ * Copyright (c) 2018 Sjoerd Simons <sjoerd.sim...@collabora.co.uk>
+ * Modified by Moses Christopher <bollavarapumoses.christop...@in.bosch.com>
+ *
+ * Panel Initialization for HX8238D panel from Himax
+ * Resolution: 320x240
+ *
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <panel.h>
+#include <spi.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* Register Address */
+#define HX8238D_OUTPUT_CTRL_ADDR 0x01
+#define HX8238D_LCD_AC_CTRL_ADDR 0x02
+#define HX8238D_POWER_CTRL_1_ADDR 0x03
+#define HX8238D_DATA_CLR_CTRL_ADDR 0X04
+#define HX8238D_FUNCTION_CTRL_ADDR 0x05
+#define HX8238D_LED_CTRL_ADDR 0x08
+#define HX8238D_CONT_BRIGHT_CTRL_ADDR 0x0A
+#define HX8238D_FRAME_CYCLE_CTRL_ADDR 0x0B
+#define HX8238D_POWER_CTRL_2_ADDR 0x0D
+#define HX8238D_POWER_CTRL_3_ADDR 0x0E
+#define HX8238D_GATE_SCAN_POS_ADDR 0x0F
+#define HX8238D_HORIZONTAL_PORCH_ADDR 0x16
+#define HX8238D_VERTICAL_PORCH_ADDR 0x17
+#define HX8238D_POWER_CTRL_4_ADDR 0x1E
+#define HX8238D_GAMMA_CTRL_1_ADDR 0x30
+#define HX8238D_GAMMA_CTRL_2_ADDR 0x31
+#define HX8238D_GAMMA_CTRL_3_ADDR 0x32
+#define HX8238D_GAMMA_CTRL_4_ADDR 0x33
+#define HX8238D_GAMMA_CTRL_5_ADDR 0x34
+#define HX8238D_GAMMA_CTRL_6_ADDR 0x35
+#define HX8238D_GAMMA_CTRL_7_ADDR 0x36
+#define HX8238D_GAMMA_CTRL_8_ADDR 0x37
+#define HX8238D_GAMMA_CTRL_9_ADDR 0x3A
+#define HX8238D_GAMMA_CTRL_10_ADDR 0x3B
+
+/* Register Data */
+#define HX8238D_OUTPUT_CTRL 0x6300
+#define HX8238D_LCD_AC_CTRL 0x0200
+#define HX8238D_POWER_CTRL_1 0x6564
+#define HX8238D_DATA_CLR_CTRL 0x04C7
+#define HX8238D_FUNCTION_CTRL 0xA884
+#define HX8238D_LED_CTRL 0x00CE
+#define HX8238D_CONT_BRIGHT_CTRL 0x4008
+#define HX8238D_FRAME_CYCLE_CTRL 0xD400
+#define HX8238D_POWER_CTRL_2 0x3229
+#define HX8238D_POWER_CTRL_3 0x1200
+#define HX8238D_GATE_SCAN_POS 0x0000
+#define HX8238D_HORIZONTAL_PORCH 0x9F80
+#define HX8238D_VERTICAL_PORCH 0x3F02
+#define HX8238D_POWER_CTRL_4 0x005C
+
+/* Gamma Control */
+#define HX8238D_GAMMA_CTRL_1 0x0103
+#define HX8238D_GAMMA_CTRL_2 0x0407
+#define HX8238D_GAMMA_CTRL_3 0x0705
+#define HX8238D_GAMMA_CTRL_4 0x0002
+#define HX8238D_GAMMA_CTRL_5 0x0505
+#define HX8238D_GAMMA_CTRL_6 0x0303
+#define HX8238D_GAMMA_CTRL_7 0x0707
+#define HX8238D_GAMMA_CTRL_8 0x0100
+#define HX8238D_GAMMA_CTRL_9 0x1F00
+#define HX8238D_GAMMA_CTRL_10 0x000F
+
+/* Primary SPI register identification, 011100 */
+/* Select register, RS=0, RS=0 */
+/* Write register, RS=1, RW=0 */
+#define HX8238D_PRIMARY_SELECT_REG 0x70
+#define HX8238D_PRIMARY_WRITE_REG (HX8238D_PRIMARY_SELECT_REG | BIT(1))
+
+#define HX8238D_REG_BIT_LEN 24
+
+struct hx8238d_priv {
+ struct spi_slave *spi;
+};
+
+static int hx8238d_ofdata_to_platdata(struct udevice *dev)
+{
+ struct hx8238d_priv *priv = dev_get_priv(dev);
+
+ priv->spi = dev_get_parent_priv(dev);
+
+ return 0;
+}
+
+/* data[0] => REGISTER ADDRESS */
+/* data[1] => REGISTER VALUE */
+struct hx8238d_command {
+ u16 data[2];
+};
+
+static struct hx8238d_command hx8238d_init_commands[] = {
+ { .data = { HX8238D_OUTPUT_CTRL_ADDR, HX8238D_OUTPUT_CTRL } },
+ { .data = { HX8238D_LCD_AC_CTRL_ADDR, HX8238D_LCD_AC_CTRL } },
+ { .data = { HX8238D_POWER_CTRL_1_ADDR, HX8238D_POWER_CTRL_1 } },
+ { .data = { HX8238D_DATA_CLR_CTRL_ADDR, HX8238D_DATA_CLR_CTRL } },
+ { .data = { HX8238D_FUNCTION_CTRL_ADDR, HX8238D_FUNCTION_CTRL } },
+ { .data = { HX8238D_LED_CTRL_ADDR, HX8238D_LED_CTRL } },
+ { .data = { HX8238D_CONT_BRIGHT_CTRL_ADDR, HX8238D_CONT_BRIGHT_CTRL } },
+ { .data = { HX8238D_FRAME_CYCLE_CTRL_ADDR, HX8238D_FRAME_CYCLE_CTRL } },
+ { .data = { HX8238D_POWER_CTRL_2_ADDR, HX8238D_POWER_CTRL_2 } },
+ { .data = { HX8238D_POWER_CTRL_3_ADDR, HX8238D_POWER_CTRL_3 } },
+ { .data = { HX8238D_GATE_SCAN_POS_ADDR, HX8238D_GATE_SCAN_POS } },
+ { .data = { HX8238D_HORIZONTAL_PORCH_ADDR, HX8238D_HORIZONTAL_PORCH } },
+ { .data = { HX8238D_VERTICAL_PORCH_ADDR, HX8238D_VERTICAL_PORCH } },
+ { .data = { HX8238D_POWER_CTRL_4_ADDR, HX8238D_POWER_CTRL_4 } },
+ { .data = { HX8238D_GAMMA_CTRL_1_ADDR, HX8238D_GAMMA_CTRL_1 } },
+ { .data = { HX8238D_GAMMA_CTRL_2_ADDR, HX8238D_GAMMA_CTRL_2 } },
+ { .data = { HX8238D_GAMMA_CTRL_3_ADDR, HX8238D_GAMMA_CTRL_3 } },
+ { .data = { HX8238D_GAMMA_CTRL_4_ADDR, HX8238D_GAMMA_CTRL_4 } },
+ { .data = { HX8238D_GAMMA_CTRL_5_ADDR, HX8238D_GAMMA_CTRL_5 } },
+ { .data = { HX8238D_GAMMA_CTRL_6_ADDR, HX8238D_GAMMA_CTRL_6 } },
+ { .data = { HX8238D_GAMMA_CTRL_7_ADDR, HX8238D_GAMMA_CTRL_7 } },
+ { .data = { HX8238D_GAMMA_CTRL_8_ADDR, HX8238D_GAMMA_CTRL_8 } },
+ { .data = { HX8238D_GAMMA_CTRL_9_ADDR, HX8238D_GAMMA_CTRL_9 } },
+ { .data = { HX8238D_GAMMA_CTRL_10_ADDR, HX8238D_GAMMA_CTRL_10 } },
+};
+
+/*
+ * Generate Primary Register Buffer for Register Select and Register Write
+ * First 6 MSB bits of Primary Register is represented with 011100
+ *
+ */
+static void hx8238d_generate_reg_buffers(struct hx8238d_command command,
+ u8 *sr_buf, uint8_t *wr_buf)
+{
+ struct hx8238d_command cmd = command;
+
+ sr_buf[0] = HX8238D_PRIMARY_SELECT_REG;
+ sr_buf[1] = (cmd.data[0] >> 8) & 0xff;
+ sr_buf[2] = (cmd.data[0]) & 0xff;
+
+ wr_buf[0] = HX8238D_PRIMARY_WRITE_REG;
+ wr_buf[1] = (cmd.data[1] >> 8) & 0xff;
+ wr_buf[2] = (cmd.data[1]) & 0xff;
+}
+
+static int hx8238d_probe(struct udevice *dev)
+{
+ struct hx8238d_priv *priv = dev_get_priv(dev);
+ int ret;
+
+ ret = spi_claim_bus(priv->spi);
+ if (ret) {
+ debug("Failed to claim bus: %d\n", ret);
+ return ret;
+ }
+
+ for (int i = 0; i < ARRAY_SIZE(hx8238d_init_commands); i++) {
+ u8 sr_buf[3], wr_buf[3];
+ const struct hx8238d_command cmd = hx8238d_init_commands[i];
+
+ hx8238d_generate_reg_buffers(cmd, sr_buf, wr_buf);
+ ret = spi_xfer(priv->spi, HX8238D_REG_BIT_LEN, sr_buf, NULL,
+ SPI_XFER_BEGIN | SPI_XFER_END);
+ if (ret) {
+ debug("Failed to select register %d\n", ret);
+ goto free;
+ }
+
+ ret = spi_xfer(priv->spi, HX8238D_REG_BIT_LEN, wr_buf, NULL,
+ SPI_XFER_BEGIN | SPI_XFER_END);
+ if (ret) {
+ debug("Failed to write value %d\n", ret);
+ goto free;
+ }
+ }
+
+free:
+ spi_release_bus(priv->spi);
+ return ret;
+}
+
+static const struct udevice_id hx8238d_ids[] = {
+ { .compatible = "himax,hx8238d" },
+ { }
+};
+
+U_BOOT_DRIVER(hx8238d) = {
+ .name = "hx8238d",
+ .id = UCLASS_PANEL,
+ .of_match = hx8238d_ids,
+ .ofdata_to_platdata = hx8238d_ofdata_to_platdata,
+ .probe = hx8238d_probe,
+ .priv_auto_alloc_size = sizeof(struct hx8238d_priv),
+};
--
2.20.1
