drm/exynos: mic: 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>
[Add error routine for component_add like decon driver from probe]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I339fb38f1f5f44e8a58f0ac745e355d2a89aa037

diff --git a/drivers/gpu/drm/exynos/exynos_drm_mic.c b/drivers/gpu/drm/exynos/exynos_drm_mic.c
index 8fe42c4..297d0db 100644 (file)
--- 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) {
@@ -472,8 +476,18 @@ 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;
@@ -482,6 +496,7 @@ err:
 static int exynos_mic_remove(struct platform_device *pdev)
 {
        component_del(&pdev->dev, &exynos_mic_component_ops);
+       pm_runtime_disable(&pdev->dev);
        return 0;
 }