From 118a17e4a8d9f91cc7c72e6f02134f17a0198ca2 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan.agner@toradex.com>
Date: Fri, 12 Dec 2014 11:32:51 +0100
Subject: video: fsl-dcu-fb: add suspend/resume support

Add suspend and resume support which disables the panel completely.
Tested with the main frame buffer instance (fb0).
---
 drivers/video/fbdev/fsl-dcu-fb.c | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'drivers/video/fbdev/fsl-dcu-fb.c')

diff --git a/drivers/video/fbdev/fsl-dcu-fb.c b/drivers/video/fbdev/fsl-dcu-fb.c
index 78a534fcfefb..9c7e9b8cf31e 100644
--- a/drivers/video/fbdev/fsl-dcu-fb.c
+++ b/drivers/video/fbdev/fsl-dcu-fb.c
@@ -22,6 +22,7 @@
 #include <video/of_display_timing.h>
 #include <video/videomode.h>
 #include <linux/pm_runtime.h>
+#include <linux/console.h>
 
 #define DRIVER_NAME			"fsl-dcu-fb"
 
@@ -968,6 +969,42 @@ static int fsl_dcu_runtime_resume(struct device *dev)
 }
 #endif
 
+#ifdef CONFIG_PM_SLEEP
+static int fsl_dcu_suspend(struct device *dev)
+{
+	struct dcu_fb_data *dcufb = dev_get_drvdata(dev);
+	struct fb_info *fbi = dcufb->fsl_dcu_info[0];
+
+	console_lock();
+	fb_set_suspend(fbi, 1);
+	console_unlock();
+
+	disable_panel(fbi);
+
+	disable_controller(dcufb->fsl_dcu_info[0]);
+	clk_disable_unprepare(dcufb->clk);
+
+	return 0;
+}
+
+static int fsl_dcu_resume(struct device *dev)
+{
+	struct dcu_fb_data *dcufb = dev_get_drvdata(dev);
+	struct fb_info *fbi = dcufb->fsl_dcu_info[0];
+
+	clk_prepare_enable(dcufb->clk);
+	enable_controller(dcufb->fsl_dcu_info[0]);
+
+	console_lock();
+	fb_set_suspend(fbi, 0);
+	console_unlock();
+
+	fsl_dcu_set_par(fbi);
+
+	return 0;
+}
+#endif
+
 static int bypass_tcon(struct device_node *np)
 {
 	struct device_node *tcon_np;
@@ -998,6 +1035,7 @@ static int bypass_tcon(struct device_node *np)
 		return PTR_ERR(tcon_reg);
 
 	writel(TCON_BYPASS_ENABLE, tcon_reg + TCON_CTRL1);
+	clk_disable_unprepare(tcon_clk);
 	return 0;
 }
 
@@ -1147,6 +1185,7 @@ static int fsl_dcu_remove(struct platform_device *pdev)
 static const struct dev_pm_ops fsl_dcu_pm_ops = {
 	SET_RUNTIME_PM_OPS(fsl_dcu_runtime_suspend,
 			fsl_dcu_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_suspend, fsl_dcu_resume)
 };
 
 static struct of_device_id fsl_dcu_dt_ids[] = {
-- 
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