drm/exynos: fix vblank bug.

In case that vblank_disable_allowed is 1, the problem that manager->pipe
could be -1 at vsync interrupt handler could be induced so this patch fixes
that.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index f5c8b07..272c3b5 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -447,7 +447,9 @@ static void fimd_win_commit(struct device *dev)
 static void fimd_win_disable(struct device *dev)
 {
        struct fimd_context *ctx = get_fimd_context(dev);
-       struct fimd_win_data *win_data;
+       struct exynos_drm_subdrv *subdrv = &ctx->subdrv;
+       struct drm_device *drm_dev = subdrv->drm_dev;
+       struct exynos_drm_manager *manager = &subdrv->manager;
        int win = ctx->default_win;
        u32 val;
 
@@ -456,8 +458,6 @@ static void fimd_win_disable(struct device *dev)
        if (win < 0 || win > WINDOWS_NR)
                return;
 
-       win_data = &ctx->win_data[win];
-
        /* protect windows */
        val = readl(ctx->regs + SHADOWCON);
        val |= SHADOWCON_WINx_PROTECT(win);
@@ -473,6 +473,29 @@ static void fimd_win_disable(struct device *dev)
        val &= ~SHADOWCON_CHx_ENABLE(win);
        val &= ~SHADOWCON_WINx_PROTECT(win);
        writel(val, ctx->regs + SHADOWCON);
+
+       /* fimd dma off. */
+       val = readl(ctx->regs + VIDCON0);
+       val &= ~(VIDCON0_ENVID | VIDCON0_ENVID_F);
+       writel(val, ctx->regs + VIDCON0);
+
+       /*
+        * if vblank is enabled status with dma off then
+        * it disables vsync interrupt.
+        */
+       if (drm_dev->vblank_enabled[manager->pipe] &&
+                       atomic_read(&drm_dev->vblank_refcount[manager->pipe])) {
+               drm_vblank_put(drm_dev, manager->pipe);
+
+               /*
+                * if vblank_disable_allowed is 0 then disable vsync interrupt
+                * right now else the vsync interrupt would be disabled by drm
+                * timer once a current process gives up ownershop of
+                * vblank event.
+                */
+               if (!drm_dev->vblank_disable_allowed)
+                       drm_vblank_off(drm_dev, manager->pipe);
+       }
 }
 
 static struct exynos_drm_overlay_ops fimd_overlay_ops = {
@@ -528,6 +551,16 @@ static irqreturn_t fimd_irq_handler(int irq, void *dev_id)
                /* VSYNC interrupt */
                writel(VIDINTCON1_INT_FRAME, ctx->regs + VIDINTCON1);
 
+       /*
+        * in case that vblank_disable_allowed is 1, it could induce
+        * the problem that manager->pipe could be -1 because with
+        * disable callback, vsync interrupt isn't disabled and at this moment,
+        * vsync interrupt could occur. the vsync interrupt would be disabled
+        * by timer handler later.
+        */
+       if (manager->pipe == -1)
+               return IRQ_HANDLED;
+
        drm_handle_vblank(drm_dev, manager->pipe);
        fimd_finish_pageflip(drm_dev, manager->pipe);
 
@@ -548,13 +581,6 @@ static int fimd_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
         */
        drm_dev->irq_enabled = 1;
 
-       /*
-        * with vblank_disable_allowed = 1, vblank interrupt will be disabled
-        * by drm timer once a current process gives up ownership of
-        * vblank event.(drm_vblank_put function was called)
-        */
-       drm_dev->vblank_disable_allowed = 1;
-
        return 0;
 }