drm/exynos: add PM functions for hdmi and mixer

This patch supports the PM for hdmi and mixer. Turn off hdmi and mixer
when suspended, and when resume, will turn on them by hdmi hotplug
detection if hdmi is attached.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index 9212d7d53f3a..ad53c4808bdb 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -2367,11 +2367,43 @@ static int __devexit hdmi_remove(struct platform_device *pdev)
         return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int hdmi_suspend(struct device *dev)
+{
+        struct exynos_drm_hdmi_context *ctx = get_hdmi_context(dev);
+        struct hdmi_context *hdata = ctx->ctx;
+
+        disable_irq(hdata->internal_irq);
+        disable_irq(hdata->external_irq);
+
+        hdata->hpd = false;
+        if (ctx->drm_dev)
+                drm_helper_hpd_irq_event(ctx->drm_dev);
+
+        hdmi_poweroff(hdata);
+
+        return 0;
+}
+
+static int hdmi_resume(struct device *dev)
+{
+        struct exynos_drm_hdmi_context *ctx = get_hdmi_context(dev);
+        struct hdmi_context *hdata = ctx->ctx;
+
+        enable_irq(hdata->external_irq);
+        enable_irq(hdata->internal_irq);
+        return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(hdmi_pm_ops, hdmi_suspend, hdmi_resume);
+
 struct platform_driver hdmi_driver = {
         .probe          = hdmi_probe,
         .remove         = __devexit_p(hdmi_remove),
         .driver         = {
                 .name   = "exynos4-hdmi",
                 .owner  = THIS_MODULE,
+                .pm     = &hdmi_pm_ops,
         },
 };