[PATCH 2/3] drm/exynos: add runtime pm support for mixer

[Rahul Sharma]

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

Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
Signed-off-by: Shirish S <s.shirish at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_mixer.c |   65 +++++++++++++++++++++++++++++----
 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 0d3ed28..b15b770 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -679,8 +679,6 @@ 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);
@@ -710,8 +708,6 @@ 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;

@@ -754,12 +750,14 @@ 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);
@@ -1193,13 +1191,66 @@ 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 = {
-- 
1.7.0.4