[U-Boot] [PATCH 2/3] sunxi: video: Add support for Hitachi tx18d42vm LCD panels

[Hans de Goede]

Hitachi tx18d42vm LCD panels have an onboard controller which needs some
initialization via spi for the panel to become functional as a regular LVDS
panel.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 board/sunxi/Kconfig             |  3 ++
 drivers/video/Makefile          |  2 +-
 drivers/video/sunxi_display.c   |  9 ++++++
 drivers/video/sunxi_lcd_panel.c | 68 +++++++++++++++++++++++++++++++++++++++++
 drivers/video/sunxi_lcd_panel.h |  9 ++++++
 5 files changed, 90 insertions(+), 1 deletion(-)
 create mode 100644 drivers/video/sunxi_lcd_panel.c
 create mode 100644 drivers/video/sunxi_lcd_panel.h

diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index fdb18a4..e9f62b9 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -357,6 +357,9 @@ config VIDEO_LCD_PANEL_PARALLEL
 config VIDEO_LCD_PANEL_LVDS
 	bool "Generic lvds interface LCD panel"
 
+config VIDEO_LCD_PANEL_HITACHI_TX18D42VM
+	bool "Hitachi tx18d42vm LCD panel"
+
 endchoice
 
 config USB_KEYBOARD
diff --git a/drivers/video/Makefile b/drivers/video/Makefile
index 42b1eaa..d4fe1aa 100644
--- a/drivers/video/Makefile
+++ b/drivers/video/Makefile
@@ -39,7 +39,7 @@ obj-$(CONFIG_VIDEO_SANDBOX_SDL) += sandbox_sdl.o
 obj-$(CONFIG_VIDEO_SED13806) += sed13806.o
 obj-$(CONFIG_VIDEO_SM501) += sm501.o
 obj-$(CONFIG_VIDEO_SMI_LYNXEM) += smiLynxEM.o videomodes.o
-obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o videomodes.o
+obj-$(CONFIG_VIDEO_SUNXI) += sunxi_display.o sunxi_lcd_panel.o videomodes.o
 obj-$(CONFIG_VIDEO_TEGRA) += tegra.o
 obj-$(CONFIG_VIDEO_VCXK) += bus_vcxk.o
 obj-$(CONFIG_VIDEO_X86) += x86_fb.o
diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index 4b63b01..f087c2c 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -19,8 +19,13 @@
 #include <fdtdec.h>
 #include <fdt_support.h>
 #include <video_fb.h>
+#include "sunxi_lcd_panel.h"
 #include "videomodes.h"
 
+#ifdef CONFIG_VIDEO_LCD_PANEL_HITACHI_TX18D42VM
+#define CONFIG_VIDEO_LCD_PANEL_LVDS
+#endif
+
 DECLARE_GLOBAL_DATA_PTR;
 
 enum sunxi_monitor {
@@ -486,6 +491,10 @@ static void sunxi_lcdc_panel_enable(void)
 		gpio_request(pin, "lcd_power");
 		gpio_direction_output(pin, 1);
 	}
+
+#ifdef CONFIG_VIDEO_LCD_PANEL_HITACHI_TX18D42VM
+	sunxi_lcd_panel_hitachi_tx18d42vm_init();
+#endif
 }
 
 static void sunxi_lcdc_backlight_enable(void)
diff --git a/drivers/video/sunxi_lcd_panel.c b/drivers/video/sunxi_lcd_panel.c
new file mode 100644
index 0000000..9ebaff2
--- /dev/null
+++ b/drivers/video/sunxi_lcd_panel.c
@@ -0,0 +1,68 @@
+/*
+ * LCD panel driver for Allwinner SoCs.
+ *
+ * (C) Copyright 2015 Hans de Goede <hdegoede at redhat.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+
+#include <asm/arch/gpio.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_VIDEO_LCD_PANEL_HITACHI_TX18D42VM
+
+#define SPI_CS		SUNXI_GPA(0)
+#define SPI_CLK		SUNXI_GPA(1)
+#define SPI_MOSI	SUNXI_GPA(2)
+
+/*
+ * Very simple write only SPI support, this does not use the generic SPI infra
+ * because that assumes R/W SPI, requiring a MISO pin. Also the necessary glue
+ * code alone would be larger then this minimal version.
+ */
+
+static void sunxi_lcd_panel_spi_write(unsigned int data, int bits)
+{
+	int i, offset;
+
+	gpio_direction_output(SPI_CS, 0);
+	for (i = 0; i < bits; i++) {
+		gpio_direction_output(SPI_CLK, 0);
+		offset = (bits - 1) - i;
+		gpio_direction_output(SPI_MOSI, (data >> offset) & 1);
+		udelay(2);
+		gpio_direction_output(SPI_CLK, 1);
+		udelay(2);
+	}
+	gpio_direction_output(SPI_CS, 1);
+	udelay(2);
+}
+
+void sunxi_lcd_panel_hitachi_tx18d42vm_init(void)
+{
+	const u16 init_data[] = {
+		0x0029,		/* reset */
+		0x0025,		/* standby */
+		0x0840,		/* enable normally black */
+		0x0430,		/* enable FRC/dither */
+		0x385f,		/* enter test mode(1) */
+		0x3ca4,		/* enter test mode(2) */
+		0x3409,		/* enable SDRRS, enlarge OE width */
+		0x4041,		/* adopt 2 line / 1 dot */
+	};
+	int i;
+
+	mdelay(50); /* Wait for lcd controller power on */
+
+	for (i = 0; i < ARRAY_SIZE(init_data); i++)
+		sunxi_lcd_panel_spi_write(init_data[i], 16);
+
+	mdelay(50); /* All the tx18d42vm drivers have a delay here ? */
+
+	sunxi_lcd_panel_spi_write(0x00ad, 16); /* display on */
+}
+
+#endif
diff --git a/drivers/video/sunxi_lcd_panel.h b/drivers/video/sunxi_lcd_panel.h
new file mode 100644
index 0000000..1fb9f1e
--- /dev/null
+++ b/drivers/video/sunxi_lcd_panel.h
@@ -0,0 +1,9 @@
+/*
+ * LCD panel driver for Allwinner SoCs.
+ *
+ * (C) Copyright 2015 Hans de Goede <hdegoede at redhat.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+void sunxi_lcd_panel_hitachi_tx18d42vm_init(void);
-- 
2.1.0