drm/exynos: add runtime pm interfaces to g2d driver

This patch makes g2d power domain and clock to be controlled
with runtime pm interfaces instead of controlling them
respectively.

Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index 3925e44..115940b 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -810,9 +810,11 @@ static void g2d_dma_start(struct g2d_data *g2d,
        struct g2d_cmdlist_node *node =
                                list_first_entry(&runqueue_node->run_cmdlist,
                                                struct g2d_cmdlist_node, list);
+       int ret;
 
-       pm_runtime_get_sync(g2d->dev);
-       clk_prepare_enable(g2d->gate_clk);
+       ret = pm_runtime_get_sync(g2d->dev);
+       if (ret < 0)
+               return;
 
        writel_relaxed(node->dma_addr, g2d->regs + G2D_DMA_SFR_BASE_ADDR);
        writel_relaxed(G2D_DMA_START, g2d->regs + G2D_DMA_COMMAND);
@@ -865,7 +867,6 @@ static void g2d_runqueue_worker(struct work_struct *work)
                                            runqueue_work);
 
        mutex_lock(&g2d->runqueue_mutex);
-       clk_disable_unprepare(g2d->gate_clk);
        pm_runtime_put_sync(g2d->dev);
 
        complete(&g2d->runqueue_node->complete);
@@ -1518,7 +1519,33 @@ static int g2d_resume(struct device *dev)
 }
 #endif
 
-static SIMPLE_DEV_PM_OPS(g2d_pm_ops, g2d_suspend, g2d_resume);
+#ifdef CONFIG_PM_RUNTIME
+static int g2d_runtime_suspend(struct device *dev)
+{
+       struct g2d_data *g2d = dev_get_drvdata(dev);
+
+       clk_disable_unprepare(g2d->gate_clk);
+
+       return 0;
+}
+
+static int g2d_runtime_resume(struct device *dev)
+{
+       struct g2d_data *g2d = dev_get_drvdata(dev);
+       int ret;
+
+       ret = clk_prepare_enable(g2d->gate_clk);
+       if (ret < 0)
+               dev_warn(dev, "failed to enable clock.\n");
+
+       return ret;
+}
+#endif
+
+static const struct dev_pm_ops g2d_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(g2d_suspend, g2d_resume)
+       SET_RUNTIME_PM_OPS(g2d_runtime_suspend, g2d_runtime_resume, NULL)
+};
 
 #ifdef CONFIG_OF
 static const struct of_device_id exynos_g2d_match[] = {