[U-Boot] [PATCH v2 4/7] video: sunxi: Hook up SSD2828 with the sunxi video driver

[Siarhei Siamashka]

Convert GPIO names from Kconfig strings into pin numbers for
the 'ssd2828_config' struct. Add SSD2828 initialization between
enabling the parallel LCD interface and turning on the backlight.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka at gmail.com>
---
Changes in v2:
 - The 'sunxi' Kconfig change now only has LCD panel option
   addition (the rest had been moved to the 'video' Kconfig).
 - Handle SSD2828 initialization directly in 'sunxi_display.c'
   without the extra 'sunxi_lcd_panel.c' source file, because
   the SSD2828 glue code is small enough.
 - Change from 'sunxi_name_to_gpio' to 'name_to_gpio'

 board/sunxi/Kconfig           |  7 +++++++
 drivers/video/sunxi_display.c | 38 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 45 insertions(+)

diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 6a4d764..747e56e 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -387,6 +387,13 @@ config VIDEO_LCD_PANEL_LVDS
 	bool "Generic lvds interface LCD panel"
 	select VIDEO_LCD_IF_LVDS
 
+config VIDEO_LCD_PANEL_MIPI_4_LANE_513_MBPS_VIA_SSD2828
+	bool "MIPI 4-lane, 513Mbps LCD panel via SSD2828 bridge chip"
+	select VIDEO_LCD_SSD2828
+	select VIDEO_LCD_IF_PARALLEL
+	---help---
+	 7.85" 768x1024 LCD panels, such as LG LP079X01 or AUO B079XAN01.0
+
 endchoice
 
 
diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index d92dfa8..c7d237b 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -20,6 +20,7 @@
 #include <fdt_support.h>
 #include <video_fb.h>
 #include "videomodes.h"
+#include "ssd2828.h"
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -826,6 +827,40 @@ static void sunxi_vga_external_dac_enable(void)
 }
 #endif /* CONFIG_VIDEO_VGA_VIA_LCD */
 
+#ifdef CONFIG_VIDEO_LCD_SSD2828
+static int sunxi_ssd2828_init(const struct ctfb_res_modes *mode)
+{
+	struct ssd2828_config cfg = {
+		.csx_pin = name_to_gpio(CONFIG_VIDEO_LCD_SPI_CS),
+		.sck_pin = name_to_gpio(CONFIG_VIDEO_LCD_SPI_SCLK),
+		.sdi_pin = name_to_gpio(CONFIG_VIDEO_LCD_SPI_MOSI),
+		.sdo_pin = name_to_gpio(CONFIG_VIDEO_LCD_SPI_MISO),
+		.reset_pin = name_to_gpio(CONFIG_VIDEO_LCD_SSD2828_RESET),
+		.ssd2828_tx_clk_khz  = CONFIG_VIDEO_LCD_SSD2828_TX_CLK * 1000,
+		.ssd2828_color_depth = 24,
+#ifdef CONFIG_VIDEO_LCD_PANEL_MIPI_4_LANE_513_MBPS_VIA_SSD2828
+		.mipi_dsi_number_of_data_lanes           = 4,
+		.mipi_dsi_bitrate_per_data_lane_mbps     = 513,
+		.mipi_dsi_delay_after_exit_sleep_mode_ms = 100,
+		.mipi_dsi_delay_after_set_display_on_ms  = 200
+#else
+#error MIPI LCD panel needs configuration parameters
+#endif
+	};
+
+	if (cfg.csx_pin == -1 || cfg.sck_pin == -1 || cfg.sdi_pin == -1) {
+		printf("SSD2828: SPI pins are not properly configured\n");
+		return 1;
+	}
+	if (cfg.reset_pin == -1) {
+		printf("SSD2828: Reset pin is not properly configured\n");
+		return 1;
+	}
+
+	return ssd2828_init(&cfg, mode);
+}
+#endif /* CONFIG_VIDEO_LCD_SSD2828 */
+
 static void sunxi_engines_init(void)
 {
 	sunxi_composer_init();
@@ -858,6 +893,9 @@ static void sunxi_mode_set(const struct ctfb_res_modes *mode,
 		sunxi_lcdc_tcon0_mode_set(mode);
 		sunxi_composer_enable();
 		sunxi_lcdc_enable();
+#ifdef CONFIG_VIDEO_LCD_SSD2828
+		sunxi_ssd2828_init(mode);
+#endif
 		sunxi_lcdc_backlight_enable();
 		break;
 	case sunxi_monitor_vga:
-- 
2.0.5