From 05e2e4666c2609bd9a72140611713c19ce28fce1 Mon Sep 17 00:00:00 2001 From: Tobias Jakobi Date: Tue, 27 Sep 2016 17:50:06 +0200 Subject: [PATCH] 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 Acked-by: Marek Szyprowski Signed-off-by: Inki Dae --- drivers/gpu/drm/exynos/exynos_drm_g2d.c | 29 ++++++++++++++++++++++------- 1 file changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c index 9c9f4f9..0bffd34 100644 --- 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) }; -- 2.7.4