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 64484711db8fa4090c2ab2fd7a2cc427be6921f4..d966989f55c34f316ea0c08e5a18414d706d3dd4 100644 (file)
--- 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;
 }