[PATCH 6/7] drm/exynos/decon5433: signal vblank only on odd fields

[Andrzej Hajda]

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 at samsung.com>
---
 drivers/gpu/drm/exynos/exynos5433_drm_decon.c | 7 +++++++
 include/video/exynos5433_decon.h              | 1 +
 2 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/exynos/exynos5433_drm_decon.c b/drivers/gpu/drm/exynos/exynos5433_drm_decon.c
index 46434ba9..ad8b93a 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 b26511a..ef8e2a8 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)
-- 
2.7.4