From: Marek Szyprowski <m.szyprowski@samsung.com>
Date: Thu, 30 Jun 2016 13:58:55 +0000 (+0200)
Subject: drm/exynos: decon: add simple runtime pm support
X-Git-Tag: submit/tizen/20160810.050017~126
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8548fcb01d3d7efecc883b54c5ebe44a1b350fa2;p=platform%2Fkernel%2Flinux-exynos.git

drm/exynos: decon: add simple runtime pm support

Add simple runtime pm to let driver to control power domain. No runtime pm
callbacks are defined, because state of the driver is already handled by
the DRM core.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Change-Id: Ib2c6b6ef6e6577ef9a7259d1ae80202ab0e0a7c7
---

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index 64484711db8f..d966989f55c3 100644
--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -17,6 +17,7 @@
 #include <linux/of_device.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
+#include <linux/pm_runtime.h>
 
 #include <video/exynos5433_decon.h>
 
@@ -514,6 +515,7 @@ static void decon_dpms_on(struct decon_context *ctx)
 	if (!ctx->suspended)
 		return;
 
+	pm_runtime_get_sync(ctx->dev);
 	ctx->suspended = false;
 
 	for (i = 0; i < ARRAY_SIZE(decon_clks_name); i++) {
@@ -577,6 +579,7 @@ static void decon_dpms_off(struct decon_context *ctx)
 	for (i = ARRAY_SIZE(decon_clks_name) - 1; i >= 0; i--)
 		clk_disable_unprepare(ctx->clks[i]);
 
+	pm_runtime_put_sync(ctx->dev);
 	ctx->suspended = true;
 
 	/*
@@ -894,13 +897,26 @@ static int exynos5433_decon_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, ctx);
 
-	return component_add(dev, &decon_component_ops);
+	pm_runtime_enable(dev);
+
+	ret = component_add(dev, &decon_component_ops);
+	if (ret)
+		goto err_disable_pm_runtime;
+
+	return 0;
+
+err_disable_pm_runtime:
+	pm_runtime_disable(dev);
+
+	return ret;
 }
 
 static int exynos5433_decon_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &decon_component_ops);
 
+	pm_runtime_disable(&pdev->dev);
+
 	return 0;
 }