[PATCH] drm: exynos: Add runtime PM support to MIC driver

[Marek Szyprowski]

This patch adds pm_runtime_get/put calls to notify device core when MIC
device is really in use. This is needed to let power domain with this
device to be turned off when display is turned off.

Signed-off-by: Marek Szyprowski <m.szyprowski at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_mic.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index a0def0be6d65..f643c380cb9a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_mic.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_mic.c
@@ -19,6 +19,7 @@
 #include <linux/of_graph.h>
 #include <linux/clk.h>
 #include <linux/component.h>
+#include <linux/pm_runtime.h>
 #include <drm/drmP.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
@@ -323,6 +324,7 @@ static void mic_post_disable(struct drm_bridge *bridge)
 	for (i = NUM_CLKS - 1; i > -1; i--)
 		clk_disable_unprepare(mic->clks[i]);
 
+	pm_runtime_put(mic->dev);
 	mic->enabled = 0;
 
 already_disabled:
@@ -338,6 +340,8 @@ static void mic_pre_enable(struct drm_bridge *bridge)
 	if (mic->enabled)
 		goto already_enabled;
 
+	pm_runtime_get_sync(mic->dev);
+
 	for (i = 0; i < NUM_CLKS; i++) {
 		ret = clk_prepare_enable(mic->clks[i]);
 		if (ret < 0) {
@@ -473,8 +477,18 @@ static int exynos_mic_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, mic);
 
+	pm_runtime_enable(dev);
+
+	ret = component_add(dev, &exynos_mic_component_ops);
+	if (ret)
+		goto err_pm;
+
 	DRM_DEBUG_KMS("MIC has been probed\n");
-	return component_add(dev, &exynos_mic_component_ops);
+
+	return 0;
+
+err_pm:
+	pm_runtime_disable(dev);
 
 err:
 	return ret;
@@ -483,6 +497,7 @@ static int exynos_mic_probe(struct platform_device *pdev)
 static int exynos_mic_remove(struct platform_device *pdev)
 {
 	component_del(&pdev->dev, &exynos_mic_component_ops);
+	pm_runtime_disable(&pdev->dev);
 	return 0;
 }
 
-- 
1.9.1