drm/exynos: add runtime pm support for mixer

This patch adds support for runtime power management for
drm mixer driver.

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Signed-off-by: Shirish S <s.shirish@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 58 insertions, 7 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index 632a941520ff..21db89530fc7 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -872,8 +872,6 @@ static void mixer_poweron(struct mixer_context *ctx)
         ctx->powered = true;
         mutex_unlock(&ctx->mixer_mutex);
 
-        pm_runtime_get_sync(ctx->dev);
-
         clk_enable(res->mixer);
         if (ctx->vp_enabled) {
                 clk_enable(res->vp);
@@ -907,8 +905,6 @@ static void mixer_poweroff(struct mixer_context *ctx)
                 clk_disable(res->sclk_mixer);
         }
 
-        pm_runtime_put_sync(ctx->dev);
-
         mutex_lock(&ctx->mixer_mutex);
         ctx->powered = false;
 
@@ -924,12 +920,14 @@ static void mixer_dpms(void *ctx, int mode)
 
         switch (mode) {
         case DRM_MODE_DPMS_ON:
-                mixer_poweron(mixer_ctx);
+                if (pm_runtime_suspended(mixer_ctx->dev))
+                        pm_runtime_get_sync(mixer_ctx->dev);
                 break;
         case DRM_MODE_DPMS_STANDBY:
         case DRM_MODE_DPMS_SUSPEND:
         case DRM_MODE_DPMS_OFF:
-                mixer_poweroff(mixer_ctx);
+                if (!pm_runtime_suspended(mixer_ctx->dev))
+                        pm_runtime_put_sync(mixer_ctx->dev);
                 break;
         default:
                 DRM_DEBUG_KMS("unknown dpms mode: %d\n", mode);
@@ -1249,13 +1247,66 @@ static int mixer_suspend(struct device *dev)
         struct exynos_drm_hdmi_context *drm_hdmi_ctx = get_mixer_context(dev);
         struct mixer_context *ctx = drm_hdmi_ctx->ctx;
 
+        DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+        if (pm_runtime_suspended(dev)) {
+                DRM_DEBUG_KMS("%s : Already suspended\n", __func__);
+                return 0;
+        }
+
         mixer_poweroff(ctx);
 
         return 0;
 }
+
+static int mixer_resume(struct device *dev)
+{
+        struct exynos_drm_hdmi_context *drm_hdmi_ctx = get_mixer_context(dev);
+        struct mixer_context *ctx = drm_hdmi_ctx->ctx;
+
+        DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+        if (!pm_runtime_suspended(dev)) {
+                DRM_DEBUG_KMS("%s : Already resumed\n", __func__);
+                return 0;
+        }
+
+        mixer_poweron(ctx);
+
+        return 0;
+}
 #endif
 
-static SIMPLE_DEV_PM_OPS(mixer_pm_ops, mixer_suspend, NULL);
+#ifdef CONFIG_PM_RUNTIME
+static int mixer_runtime_suspend(struct device *dev)
+{
+        struct exynos_drm_hdmi_context *drm_hdmi_ctx = get_mixer_context(dev);
+        struct mixer_context *ctx = drm_hdmi_ctx->ctx;
+
+        DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+        mixer_poweroff(ctx);
+
+        return 0;
+}
+
+static int mixer_runtime_resume(struct device *dev)
+{
+        struct exynos_drm_hdmi_context *drm_hdmi_ctx = get_mixer_context(dev);
+        struct mixer_context *ctx = drm_hdmi_ctx->ctx;
+
+        DRM_DEBUG_KMS("[%d] %s\n", __LINE__, __func__);
+
+        mixer_poweron(ctx);
+
+        return 0;
+}
+#endif
+
+static const struct dev_pm_ops mixer_pm_ops = {
+        SET_SYSTEM_SLEEP_PM_OPS(mixer_suspend, mixer_resume)
+        SET_RUNTIME_PM_OPS(mixer_runtime_suspend, mixer_runtime_resume, NULL)
+};
 
 struct platform_driver mixer_driver = {
         .driver = {