drm/exynos/decon5433: signal vblank only on odd fields

In case of interlace mode irq is generated for odd and even fields, but
vblank should be signaled only for the last emitted field.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index b828480e81c5..0fd6f7a18364 100644
--- a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
+++ b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
@@ -591,6 +591,13 @@ static irqreturn_t decon_irq_handler(int irq, void *dev_id)
 
         if (val) {
                 writel(val, ctx->addr + DECON_VIDINTCON1);
+                if (ctx->out_type & IFTYPE_HDMI) {
+                        val = readl(ctx->addr + DECON_VIDOUTCON0);
+                        val &= VIDOUT_INTERLACE_EN_F | VIDOUT_INTERLACE_FIELD_F;
+                        if (val ==
+                            (VIDOUT_INTERLACE_EN_F | VIDOUT_INTERLACE_FIELD_F))
+                                return IRQ_HANDLED;
+                }
                 drm_crtc_handle_vblank(&ctx->crtc->base);
         }
 
diff --git a/include/video/exynos5433_decon.h b/include/video/exynos5433_decon.h
index b26511a0ddf8..ef8e2a8ad0af 100644
--- a/include/video/exynos5433_decon.h
+++ b/include/video/exynos5433_decon.h
@@ -89,6 +89,7 @@
 #define VIDCON0_ENVID_F                 (1 << 0)
 
 /* VIDOUTCON0 */
+#define VIDOUT_INTERLACE_FIELD_F        (1 << 29)
 #define VIDOUT_INTERLACE_EN_F           (1 << 28)
 #define VIDOUT_LCD_ON                   (1 << 24)
 #define VIDOUT_IF_F_MASK                (0x3 << 20)