sunxi: video: Enable video on sun8i, which supports LCD but not HDMI

The A23 (sun8i) only has lcd output support, so allow building the video code
without HDMI support for use with the A23.

Also the A23 has the same reset bits (and necessity to enable the DRC block)
as the sun6i, so enable those bits for sun8i too.

Note building without HDMI support is useful for the A13 (sun5i variant) too,
as that one does not have HDMI either.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

board/sunxi/Kconfig

@@ -287,6 +287,13 @@ config VIDEO
 	or VGA output found on most sunxi devices. See doc/README.video for
 	info on how to select the video output and mode.
 
+config VIDEO_HDMI
+	boolean "HDMI output support"
+	depends on VIDEO && !MACH_SUN8I
+	default y
+	---help---
+	Say Y here to add support for outputting video over HDMI.
+
 config VIDEO_LCD_MODE
 	string "LCD panel timing details"
 	depends on VIDEO

drivers/video/sunxi_display.c

@@ -39,6 +39,8 @@ struct sunxi_display {
 	unsigned int depth;
 } sunxi_display;
 
+#ifdef CONFIG_VIDEO_HDMI
+
 /*
  * Wait up to 200ms for value to be set in given part of reg.
  */
@@ -267,6 +269,8 @@ static int sunxi_hdmi_edid_get_mode(struct ctfb_res_modes *mode)
 	return 0;
 }
 
+#endif /* CONFIG_VIDEO_HDMI */
+
 /*
  * This is the entity that mixes and matches the different layers and inputs.
  * Allwinner calls it the back-end, but i like composer better.
@@ -279,7 +283,7 @@ static void sunxi_composer_init(void)
 		(struct sunxi_de_be_reg *)SUNXI_DE_BE0_BASE;
 	int i;
 
-#ifdef CONFIG_MACH_SUN6I
+#if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I
 	/* Reset off */
 	setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_DE_BE0);
 #endif
@@ -409,7 +413,7 @@ static void sunxi_lcdc_init(void)
 		(struct sunxi_lcdc_reg *)SUNXI_LCD0_BASE;
 
 	/* Reset off */
-#ifdef CONFIG_MACH_SUN6I
+#if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I
 	setbits_le32(&ccm->ahb_reset1_cfg, 1 << AHB_RESET_OFFSET_LCD0);
 #else
 	setbits_le32(&ccm->lcd0_ch0_clk_cfg, CCM_LCD_CH0_CTRL_RST);
@@ -566,6 +570,8 @@ static void sunxi_lcdc_tcon0_mode_set(const struct ctfb_res_modes *mode)
 	writel(0, &lcdc->tcon0_io_tristate);
 }
 
+#ifdef CONFIG_VIDEO_HDMI
+
 static void sunxi_lcdc_tcon1_mode_set(const struct ctfb_res_modes *mode,
 				      int *clk_div, int *clk_double)
 {
@@ -712,9 +718,11 @@ static void sunxi_hdmi_enable(void)
 	setbits_le32(&hdmi->video_ctrl, SUNXI_HDMI_VIDEO_CTRL_ENABLE);
 }
 
+#endif /* CONFIG_VIDEO_HDMI */
+
 static void sunxi_drc_init(void)
 {
-#ifdef CONFIG_MACH_SUN6I
+#if defined CONFIG_MACH_SUN6I || defined CONFIG_MACH_SUN8I
 	struct sunxi_ccm_reg * const ccm =
 		(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 
@@ -739,6 +747,7 @@ static void sunxi_mode_set(const struct ctfb_res_modes *mode,
 		break;
 	case sunxi_monitor_dvi:
 	case sunxi_monitor_hdmi: {
+#ifdef CONFIG_VIDEO_HDMI
 		int clk_div, clk_double;
 		sunxi_composer_mode_set(mode, address);
 		sunxi_lcdc_tcon1_mode_set(mode, &clk_div, &clk_double);
@@ -746,6 +755,7 @@ static void sunxi_mode_set(const struct ctfb_res_modes *mode,
 		sunxi_composer_enable();
 		sunxi_lcdc_enable();
 		sunxi_hdmi_enable();
+#endif
 		}
 		break;
 	case sunxi_monitor_lcd:
@@ -779,9 +789,12 @@ void *video_hw_init(void)
 	const struct ctfb_res_modes *mode;
 	struct ctfb_res_modes custom;
 	const char *options;
-	int i, ret, hpd, edid;
+#ifdef CONFIG_VIDEO_HDMI
+	int ret, hpd, edid;
+#endif
 	char mon[16];
 	char *lcd_mode = CONFIG_VIDEO_LCD_MODE;
+	int i;
 
 	memset(&sunxi_display, 0, sizeof(struct sunxi_display));
 
@@ -791,9 +804,13 @@ void *video_hw_init(void)
 
 	video_get_ctfb_res_modes(RES_MODE_1024x768, 24, &mode,
 				 &sunxi_display.depth, &options);
+#ifdef CONFIG_VIDEO_HDMI
 	hpd = video_get_option_int(options, "hpd", 1);
 	edid = video_get_option_int(options, "edid", 1);
 	sunxi_display.monitor = sunxi_monitor_dvi;
+#else
+	sunxi_display.monitor = sunxi_monitor_lcd;
+#endif
 	video_get_option_string(options, "monitor", mon, sizeof(mon),
 				sunxi_get_mon_desc(sunxi_display.monitor));
 	for (i = 0; i <= SUNXI_MONITOR_LAST; i++) {
@@ -811,6 +828,10 @@ void *video_hw_init(void)
 		return NULL;
 	case sunxi_monitor_dvi:
 	case sunxi_monitor_hdmi:
+#ifndef CONFIG_VIDEO_HDMI
+		printf("HDMI/DVI not supported on this board\n");
+		return NULL;
+#else
 		/* Always call hdp_detect, as it also enables clocks, etc. */
 		ret = sunxi_hdmi_hpd_detect();
 		if (ret) {
@@ -829,6 +850,7 @@ void *video_hw_init(void)
 
 		/* Fall back / through to LCD */
 		sunxi_display.monitor = sunxi_monitor_lcd;
+#endif
 	case sunxi_monitor_lcd:
 		if (lcd_mode[0]) {
 			sunxi_display.depth = video_get_params(&custom, lcd_mode);