Revert "drm/exynos: g2d: fix system and runtime pm integration"

This reverts commit b05984e21a7e000bf5074ace00d7a574944b2c16.

The change, i.e. merging the sleep and runpm operations, produces
a deadlock situation:
(1) exynos_g2d_exec_ioctl() prepares a runqueue node and
    calls g2d_exec_runqueue()
(2) g2d_exec_runqueue() calls g2d_dma_start() which gets
    runtime PM sync
(3) runtime PM core calls g2d_runtime_resume()
(4) g2d_runtime_resume() calls g2d_exec_runqueue(), which
    loops back to (2)

Due to mutexes that are in place, a deadlock situation is created.

Signed-off-by: Tobias Jakobi <tjakobi@math.uni-bielefeld.de>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
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 9c9f4f9721500dfbc257b86c6fbfbb2431ff0e62..0bffd349fcadf5473368ae98dcf02f45a69ba149 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -1475,8 +1475,8 @@ static int g2d_remove(struct platform_device *pdev)
        return 0;
 }
 
-#ifdef CONFIG_PM
-static int g2d_runtime_suspend(struct device *dev)
+#ifdef CONFIG_PM_SLEEP
+static int g2d_suspend(struct device *dev)
 {
        struct g2d_data *g2d = dev_get_drvdata(dev);
 
@@ -1490,6 +1490,25 @@ static int g2d_runtime_suspend(struct device *dev)
 
        flush_work(&g2d->runqueue_work);
 
+       return 0;
+}
+
+static int g2d_resume(struct device *dev)
+{
+       struct g2d_data *g2d = dev_get_drvdata(dev);
+
+       g2d->suspended = false;
+       g2d_exec_runqueue(g2d);
+
+       return 0;
+}
+#endif
+
+#ifdef CONFIG_PM
+static int g2d_runtime_suspend(struct device *dev)
+{
+       struct g2d_data *g2d = dev_get_drvdata(dev);
+
        clk_disable_unprepare(g2d->gate_clk);
 
        return 0;
@@ -1504,16 +1523,12 @@ static int g2d_runtime_resume(struct device *dev)
        if (ret < 0)
                dev_warn(dev, "failed to enable clock.\n");
 
-       g2d->suspended = false;
-       g2d_exec_runqueue(g2d);
-
        return ret;
 }
 #endif
 
 static const struct dev_pm_ops g2d_pm_ops = {
-       SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
-                               pm_runtime_force_resume)
+       SET_SYSTEM_SLEEP_PM_OPS(g2d_suspend, g2d_resume)
        SET_RUNTIME_PM_OPS(g2d_runtime_suspend, g2d_runtime_resume, NULL)
 };