From: Tomi Valkeinen <tomi.valkeinen@ti.com>
Date: Thu, 26 Oct 2017 14:40:12 +0300
Subject: drm/omap: fix WBDELAYCOUNT with interlace
Git-commit: b994e53c2c6437689873af4ff61803bef78a2330
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Vertical blanking needs to be halved on interlace modes. WBDELAYCOUNT
was calculated without such halving, resulting in WBUNCOMPLETE errors.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: Benoit Parrot <bparrot@ti.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/omapdrm/dss/dispc.c |   14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/drivers/gpu/drm/omapdrm/dss/dispc.c
+++ b/drivers/gpu/drm/omapdrm/dss/dispc.c
@@ -2814,14 +2814,18 @@ int dispc_wb_setup(struct dispc_device *
 		/* WBDELAYCOUNT */
 		REG_FLD_MOD(dispc, DISPC_OVL_ATTRIBUTES2(plane), 0, 7, 0);
 	} else {
-		int wbdelay;
+		u32 wbdelay;
 
 		if (channel_in == DSS_WB_TV_MGR)
-			wbdelay = min(vm->vsync_len + vm->vback_porch,
-				(u32)255);
+			wbdelay = vm->vsync_len + vm->vback_porch;
 		else
-			wbdelay = min(vm->vfront_porch +
-				vm->vsync_len + vm->vback_porch, (u32)255);
+			wbdelay = vm->vfront_porch + vm->vsync_len +
+				vm->vback_porch;
+
+		if (vm->flags & DISPLAY_FLAGS_INTERLACED)
+			wbdelay /= 2;
+
+		wbdelay = min(wbdelay, 255u);
 
 		/* WBDELAYCOUNT */
 		REG_FLD_MOD(dispc, DISPC_OVL_ATTRIBUTES2(plane), wbdelay, 7, 0);