drm/exynos: added mutex lock and code clean.

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 777b93c..ca83139 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -87,6 +87,7 @@ struct fimd_context {
        u32                             vidcon0;
        u32                             vidcon1;
        bool                            suspended;
+       struct mutex                    lock;
 
        struct fb_videomode             *timing;
 };
@@ -137,11 +138,22 @@ static struct exynos_drm_display_ops fimd_display_ops = {
 
 static void fimd_dpms(struct device *subdrv_dev, int mode)
 {
+       struct fimd_context *ctx = get_fimd_context(subdrv_dev);
+
        DRM_DEBUG_KMS("%s, %d\n", __FILE__, mode);
 
+       mutex_lock(&ctx->lock);
+
        switch (mode) {
        case DRM_MODE_DPMS_ON:
-               pm_runtime_get_sync(subdrv_dev);
+               /*
+                * enable fimd hardware only if suspended status.
+                *
+                * P.S. fimd_dpms function would be called at booting time so
+                * clk_enable could be called double time.
+                */
+               if (ctx->suspended)
+                       pm_runtime_get_sync(subdrv_dev);
                break;
        case DRM_MODE_DPMS_STANDBY:
        case DRM_MODE_DPMS_SUSPEND:
@@ -152,6 +164,8 @@ static void fimd_dpms(struct device *subdrv_dev, int mode)
                DRM_DEBUG_KMS("unspecified mode %d\n", mode);
                break;
        }
+
+       mutex_unlock(&ctx->lock);
 }
 
 static void fimd_apply(struct device *subdrv_dev)
@@ -803,13 +817,6 @@ static int __devinit fimd_probe(struct platform_device *pdev)
                goto err_req_irq;
        }
 
-       pm_runtime_set_active(dev);
-       pm_runtime_enable(dev);
-       pm_runtime_get_sync(dev);
-
-       for (win = 0; win < WINDOWS_NR; win++)
-               fimd_clear_win(ctx, win);
-
        ctx->clkdiv = fimd_calc_clkdiv(ctx, timing);
        ctx->vidcon0 = pdata->vidcon0;
        ctx->vidcon1 = pdata->vidcon1;
@@ -831,7 +838,17 @@ static int __devinit fimd_probe(struct platform_device *pdev)
        subdrv->manager.display_ops = &fimd_display_ops;
        subdrv->manager.dev = dev;
 
+       mutex_init(&ctx->lock);
+
        platform_set_drvdata(pdev, ctx);
+
+       pm_runtime_set_active(dev);
+       pm_runtime_enable(dev);
+       pm_runtime_get_sync(dev);
+
+       for (win = 0; win < WINDOWS_NR; win++)
+               fimd_clear_win(ctx, win);
+
        exynos_drm_subdrv_register(subdrv);
 
        return 0;
@@ -894,7 +911,6 @@ out:
 #ifdef CONFIG_PM_SLEEP
 static int fimd_suspend(struct device *dev)
 {
-       struct fimd_context *ctx = get_fimd_context(dev);
        int ret;
 
        if (pm_runtime_suspended(dev))
@@ -904,13 +920,11 @@ static int fimd_suspend(struct device *dev)
        if (ret < 0)
                return ret;
 
-       ctx->suspended = true;
        return 0;
 }
 
 static int fimd_resume(struct device *dev)
 {
-       struct fimd_context *ctx = get_fimd_context(dev);
        int ret;
 
        ret = pm_runtime_resume(dev);
@@ -931,7 +945,6 @@ static int fimd_resume(struct device *dev)
 
        pm_runtime_enable(dev);
 
-       ctx->suspended = false;
        return 0;
 }
 #endif