video: tegra20: dc: add powergate

Add powergate use on T114 to complete resetting of DC.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>

drivers/video/tegra20/tegra-dc.c

@@ -20,6 +20,7 @@
 #include <asm/arch/clock.h>
 #include <asm/arch/funcmux.h>
 #include <asm/arch/pinmux.h>
+#include <asm/arch/powergate.h>
 #include <asm/arch/pwm.h>
 
 #include "tegra-dc.h"
@@ -30,6 +31,7 @@ DECLARE_GLOBAL_DATA_PTR;
 struct tegra_dc_soc_info {
 	bool has_timer;
 	bool has_rgb;
+	bool has_pgate;
 };
 
 /* Information about the display controller */
@@ -349,6 +351,28 @@ static int tegra_lcd_probe(struct udevice *dev)
 	funcmux_select(PERIPH_ID_DISP1, FUNCMUX_DEFAULT);
 #endif
 
+	if (priv->soc->has_pgate) {
+		uint powergate;
+
+		if (priv->pipe)
+			powergate = TEGRA_POWERGATE_DISB;
+		else
+			powergate = TEGRA_POWERGATE_DIS;
+
+		ret = tegra_powergate_power_off(powergate);
+		if (ret < 0) {
+			log_err("failed to power off DISP gate: %d", ret);
+			return ret;
+		}
+
+		ret = tegra_powergate_sequence_power_up(powergate,
+							priv->dc_clk[0]);
+		if (ret < 0) {
+			log_err("failed to power up DISP gate: %d", ret);
+			return ret;
+		}
+	}
+
 	if (tegra_display_probe(priv, (void *)plat->base)) {
 		debug("%s: Failed to probe display driver\n", __func__);
 		return -1;
@@ -493,16 +517,19 @@ static const struct video_ops tegra_lcd_ops = {
 static const struct tegra_dc_soc_info tegra20_dc_soc_info = {
 	.has_timer = true,
 	.has_rgb = true,
+	.has_pgate = false,
 };
 
 static const struct tegra_dc_soc_info tegra30_dc_soc_info = {
 	.has_timer = false,
 	.has_rgb = true,
+	.has_pgate = false,
 };
 
 static const struct tegra_dc_soc_info tegra114_dc_soc_info = {
 	.has_timer = false,
 	.has_rgb = false,
+	.has_pgate = true,
 };
 
 static const struct udevice_id tegra_lcd_ids[] = {