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

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Date:   Fri, 20 Jan 2017 07:52:24 +0100
From:   Andrzej Hajda <a.hajda@...sung.com>
To:     Inki Dae <inki.dae@...sung.com>, dri-devel@...ts.freedesktop.org,
        Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Andrzej Hajda <a.hajda@...sung.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        linux-kernel@...r.kernel.org, linux-samsung-soc@...r.kernel.org
Subject: [PATCH 6/7] 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@...sung.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