drm/exynos: add pm_runtime to FIMD

Let pm_runtime handle the enabling/disabling of the device with proper
refcnt instead of rely on specific flags to track the enabled state.

Chnagelog v3:
- Revive suspended varable to check the suspend status.

Changelog v2:
- Remove unnecessary changes which removed commit callback from decon drivers
  and modify CONFIG_PM_SLEEP -> CONFIG_PM

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index bd75c15..2c38323 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -745,7 +745,6 @@ static void fimd_disable_plane(struct exynos_drm_crtc *crtc,
 static void fimd_enable(struct exynos_drm_crtc *crtc)
 {
        struct fimd_context *ctx = crtc->ctx;
-       int ret;
 
        if (!ctx->suspended)
                return;
@@ -754,18 +753,6 @@ static void fimd_enable(struct exynos_drm_crtc *crtc)
 
        pm_runtime_get_sync(ctx->dev);
 
-       ret = clk_prepare_enable(ctx->bus_clk);
-       if (ret < 0) {
-               DRM_ERROR("Failed to prepare_enable the bus clk [%d]\n", ret);
-               return;
-       }
-
-       ret = clk_prepare_enable(ctx->lcd_clk);
-       if  (ret < 0) {
-               DRM_ERROR("Failed to prepare_enable the lcd clk [%d]\n", ret);
-               return;
-       }
-
        /* if vblank was enabled status, enable it again. */
        if (test_and_clear_bit(0, &ctx->irq_flags))
                fimd_enable_vblank(ctx->crtc);
@@ -795,11 +782,7 @@ static void fimd_disable(struct exynos_drm_crtc *crtc)
 
        writel(0, ctx->regs + VIDCON0);
 
-       clk_disable_unprepare(ctx->lcd_clk);
-       clk_disable_unprepare(ctx->bus_clk);
-
        pm_runtime_put_sync(ctx->dev);
-
        ctx->suspended = true;
 }
 
@@ -1121,12 +1104,49 @@ static int fimd_remove(struct platform_device *pdev)
        return 0;
 }
 
+#ifdef CONFIG_PM
+static int exynos_fimd_suspend(struct device *dev)
+{
+       struct fimd_context *ctx = dev_get_drvdata(dev);
+
+       clk_disable_unprepare(ctx->lcd_clk);
+       clk_disable_unprepare(ctx->bus_clk);
+
+       return 0;
+}
+
+static int exynos_fimd_resume(struct device *dev)
+{
+       struct fimd_context *ctx = dev_get_drvdata(dev);
+       int ret;
+
+       ret = clk_prepare_enable(ctx->bus_clk);
+       if (ret < 0) {
+               DRM_ERROR("Failed to prepare_enable the bus clk [%d]\n", ret);
+               return ret;
+       }
+
+       ret = clk_prepare_enable(ctx->lcd_clk);
+       if  (ret < 0) {
+               DRM_ERROR("Failed to prepare_enable the lcd clk [%d]\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+#endif
+
+static const struct dev_pm_ops exynos_fimd_pm_ops = {
+       SET_RUNTIME_PM_OPS(exynos_fimd_suspend, exynos_fimd_resume, NULL)
+};
+
 struct platform_driver fimd_driver = {
        .probe          = fimd_probe,
        .remove         = fimd_remove,
        .driver         = {
                .name   = "exynos4-fb",
                .owner  = THIS_MODULE,
+               .pm     = &exynos_fimd_pm_ops,
                .of_match_table = fimd_driver_dt_match,
        },
 };