[PATCH v6 04/18] video: tegra20: dc: pass DC id to internal devices

[Svyatoslav Ryhel]

Tegra SoC has 2 independent display controllers called DC_A and
DC_B, they are handled differently by internal video devices like
DSI and HDMI controllers so it is important for last to know
which display controller is used to properly set up registers.
To achieve this, a pipe field was added to pdata to pass display
controller id to internal Tegra SoC devices.

Tested-by: Agneli <poczt at protonmail.ch> # Toshiba AC100 T20
Tested-by: Robert Eckelmann <longnoserob at gmail.com> # ASUS TF101
Tested-by: Andreas Westman Dorcsak <hedmoo at yahoo.com> # ASUS Grouper E1565
Tested-by: Ion Agorria <ion at agorria.com> # HTC One X
Tested-by: Svyatoslav Ryhel <clamor95 at gmail.com> # Nvidia Tegratab T114
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/video/tegra20/tegra-dc.c | 6 ++++++
 drivers/video/tegra20/tegra-dc.h | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c
index 5d8874f323..0e94e665ef 100644
--- a/drivers/video/tegra20/tegra-dc.c
+++ b/drivers/video/tegra20/tegra-dc.c
@@ -45,6 +45,7 @@ struct tegra_lcd_priv {
 	unsigned pixel_clock;		/* Pixel clock in Hz */
 	int dc_clk[2];			/* Contains clk and its parent */
 	bool rotation;			/* 180 degree panel turn */
+	bool pipe;			/* DC controller: 0 for A, 1 for B */
 };
 
 enum {
@@ -406,6 +407,9 @@ static int tegra_lcd_of_to_plat(struct udevice *dev)
 
 	priv->rotation = dev_read_bool(dev, "nvidia,180-rotation");
 
+	if (!strcmp(dev->name, TEGRA_DC_B))
+		priv->pipe = 1;
+
 	rgb = fdt_subnode_offset(blob, node, "rgb");
 	if (rgb < 0) {
 		debug("%s: Cannot find rgb subnode for '%s' (ret=%d)\n",
@@ -431,12 +435,14 @@ static int tegra_lcd_of_to_plat(struct udevice *dev)
 		return ret;
 	}
 
+	/* Fill the platform data for internal devices */
 	if (!strcmp(priv->panel->name, TEGRA_DSI_A) ||
 	    !strcmp(priv->panel->name, TEGRA_DSI_B)) {
 		struct tegra_dc_plat *dc_plat = dev_get_plat(priv->panel);
 
 		dc_plat->dev = dev;
 		dc_plat->dc = priv->dc;
+		dc_plat->pipe = priv->pipe;
 	}
 
 	ret = panel_get_display_timing(priv->panel, &priv->timing);
diff --git a/drivers/video/tegra20/tegra-dc.h b/drivers/video/tegra20/tegra-dc.h
index 5c05221038..75fc0fa4de 100644
--- a/drivers/video/tegra20/tegra-dc.h
+++ b/drivers/video/tegra20/tegra-dc.h
@@ -14,12 +14,15 @@
 /* arch-tegra/dc exists only because T124 uses it */
 #include <asm/arch-tegra/dc.h>
 
+#define TEGRA_DC_A		"dc at 54200000"
+#define TEGRA_DC_B		"dc at 54240000"
 #define TEGRA_DSI_A		"dsi at 54300000"
 #define TEGRA_DSI_B		"dsi at 54400000"
 
 struct tegra_dc_plat {
 	struct udevice *dev;		/* Display controller device */
 	struct dc_ctlr *dc;		/* Display controller regmap */
+	bool pipe;			/* DC number: 0 for A, 1 for B */
 };
 
 /* This holds information about a window which can be displayed */
-- 
2.40.1