3 files changed, 31 insertions, 10 deletions

diff --git a/drivers/media/video/ivtv/ivtv-driver.h b/drivers/media/video/ivtv/ivtv-driver.h
index 6e53a1f04f7..6c7c9a57a1a 100644
--- a/drivers/media/video/ivtv/ivtv-driver.h
+++ b/drivers/media/video/ivtv/ivtv-driver.h
@@ -531,6 +531,7 @@ struct yuv_frame_info
 	u32 tru_w;
 	u32 tru_h;
 	u32 offset_y;
+	int lace_mode;
 };
 
 #define IVTV_YUV_MODE_INTERLACED	0x00
@@ -603,7 +604,6 @@ struct yuv_playback_info
 	int decode_height;
 
 	int frame_interlaced;
-	int frame_interlaced_last;
 
 	int lace_mode;
 	int lace_threshold;
@@ -614,6 +614,11 @@ struct yuv_playback_info
 
 	u32 yuv_forced_update;
 	int update_frame;
+
+	int sync_field[4];  /* Field to sync on */
+	int field_delay[4]; /* Flag to extend duration of previous frame */
+	u8 fields_lapsed;   /* Counter used when delaying a frame */
+
 	struct yuv_frame_info new_frame_info[4];
 	struct yuv_frame_info old_frame_info;
 	struct yuv_frame_info old_frame_info_args;
diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c
index fcd6e7f5f12..88c6f4ff5c6 100644
--- a/drivers/media/video/ivtv/ivtv-irq.c
+++ b/drivers/media/video/ivtv/ivtv-irq.c
@@ -698,17 +698,21 @@ static void ivtv_irq_vsync(struct ivtv *itv)
 
 	if (0) IVTV_DEBUG_IRQ("DEC VSYNC\n");
 
-	if (((frame ^ itv->yuv_info.lace_sync_field) == 0 && ((itv->lastVsyncFrame & 1) ^ itv->yuv_info.lace_sync_field)) ||
+	if (((frame ^ itv->yuv_info.sync_field[last_dma_frame]) == 0 &&
+		((itv->lastVsyncFrame & 1) ^ itv->yuv_info.sync_field[last_dma_frame])) ||
 			(frame != (itv->lastVsyncFrame & 1) && !itv->yuv_info.frame_interlaced)) {
 		int next_dma_frame = last_dma_frame;
 
-		if (next_dma_frame >= 0 && next_dma_frame != atomic_read(&itv->yuv_info.next_fill_frame)) {
-			write_reg(yuv_offset[next_dma_frame] >> 4, 0x82c);
-			write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x830);
-			write_reg(yuv_offset[next_dma_frame] >> 4, 0x834);
-			write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x838);
-			next_dma_frame = (next_dma_frame + 1) & 0x3;
-			atomic_set(&itv->yuv_info.next_dma_frame, next_dma_frame);
+		if (!(itv->yuv_info.frame_interlaced && itv->yuv_info.field_delay[next_dma_frame] && itv->yuv_info.fields_lapsed < 1)) {
+			if (next_dma_frame >= 0 && next_dma_frame != atomic_read(&itv->yuv_info.next_fill_frame)) {
+				write_reg(yuv_offset[next_dma_frame] >> 4, 0x82c);
+				write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x830);
+				write_reg(yuv_offset[next_dma_frame] >> 4, 0x834);
+				write_reg((yuv_offset[next_dma_frame] + IVTV_YUV_BUFFER_UV_OFFSET) >> 4, 0x838);
+				next_dma_frame = (next_dma_frame + 1) & 0x3;
+				atomic_set(&itv->yuv_info.next_dma_frame, next_dma_frame);
+				itv->yuv_info.fields_lapsed = -1;
+			}
 		}
 	}
 	if (frame != (itv->lastVsyncFrame & 1)) {
@@ -749,6 +753,8 @@ static void ivtv_irq_vsync(struct ivtv *itv)
 				set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
 			}
 		}
+
+		itv->yuv_info.fields_lapsed ++;
 	}
 }
 
diff --git a/drivers/media/video/ivtv/ivtv-yuv.c b/drivers/media/video/ivtv/ivtv-yuv.c
index 5c94d3282c8..fa8c76f3d35 100644
--- a/drivers/media/video/ivtv/ivtv-yuv.c
+++ b/drivers/media/video/ivtv/ivtv-yuv.c
@@ -612,7 +612,6 @@ static void ivtv_yuv_handle_vertical(struct ivtv *itv, struct yuv_frame_info *wi
 		itv->yuv_info.v_filter_2 = v_filter_2;
 	}
 
-	itv->yuv_info.frame_interlaced_last = itv->yuv_info.frame_interlaced;
 }
 
 /* Modify the supplied coordinate information to fit the visible osd area */
@@ -799,6 +798,7 @@ static u32 ivtv_yuv_window_setup (struct ivtv *itv, struct yuv_frame_info *windo
 	    (itv->yuv_info.old_frame_info.src_y != window->src_y) ||
 	    (itv->yuv_info.old_frame_info.pan_y != window->pan_y) ||
 	    (itv->yuv_info.old_frame_info.vis_h != window->vis_h) ||
+	    (itv->yuv_info.old_frame_info.lace_mode != window->lace_mode) ||
 	    (itv->yuv_info.old_frame_info.interlaced_y != window->interlaced_y) ||
 	    (itv->yuv_info.old_frame_info.interlaced_uv != window->interlaced_uv)) {
 		yuv_update |= IVTV_YUV_UPDATE_VERTICAL;
@@ -970,6 +970,9 @@ int ivtv_yuv_prep_frame(struct ivtv *itv, struct ivtv_dma_frame *args)
 	itv->yuv_info.new_frame_info[frame].tru_w = args->src_width;
 	itv->yuv_info.new_frame_info[frame].tru_h = args->src_height;
 
+	/* Snapshot field order */
+	itv->yuv_info.sync_field[frame] = itv->yuv_info.lace_sync_field;
+
 	/* Are we going to offset the Y plane */
 	if (args->src.height + args->src.top < 512-16)
 		itv->yuv_info.new_frame_info[frame].offset_y = 1;
@@ -985,6 +988,7 @@ int ivtv_yuv_prep_frame(struct ivtv *itv, struct ivtv_dma_frame *args)
 	itv->yuv_info.new_frame_info[frame].update = 0;
 	itv->yuv_info.new_frame_info[frame].interlaced_y = 0;
 	itv->yuv_info.new_frame_info[frame].interlaced_uv = 0;
+	itv->yuv_info.new_frame_info[frame].lace_mode = itv->yuv_info.lace_mode;
 
 	if (memcmp (&itv->yuv_info.old_frame_info_args, &itv->yuv_info.new_frame_info[frame],
 	    sizeof (itv->yuv_info.new_frame_info[frame]))) {
@@ -995,6 +999,12 @@ int ivtv_yuv_prep_frame(struct ivtv *itv, struct ivtv_dma_frame *args)
 
 	itv->yuv_info.new_frame_info[frame].update |= register_update;
 
+	/* Should this frame be delayed ? */
+	if (itv->yuv_info.sync_field[frame] != itv->yuv_info.sync_field[(frame - 1) & 3])
+		itv->yuv_info.field_delay[frame] = 1;
+	else
+		itv->yuv_info.field_delay[frame] = 0;
+
 	/* DMA the frame */
 	mutex_lock(&itv->udma.lock);