ivtv: attach yuv field order to each frame

From: Ian Armstrong <ian@iarmst.demon.co.uk>

In the current driver, the field order is global. As soon as it's changed it
takes immediate effect. This is a problem when the video changes order mid
stream. Although it mostly works okay, the video may judder / flicker.

This patch attaches the field order to the frame, so that any buffered frames
will not be displayed until the correct field. In the event that the field
order is changed mid stream, the driver will ensure that the previous frame
is displayed for a minimum of 3 fields. These are the two original fields the
frame should have occupied, plus the one extra since the new frame still has
to wait for the correct field.

Signed-off-by: Ian Armstrong <ian@iarmst.demon.co.uk>
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>

1 files changed, 14 insertions, 8 deletions

diff --git a/linux/drivers/media/video/ivtv/ivtv-irq.c b/linux/drivers/media/video/ivtv/ivtv-irq.c
index 405f7e4b7..65622c1e4 100644
--- a/linux/drivers/media/video/ivtv/ivtv-irq.c
+++ b/linux/drivers/media/video/ivtv/ivtv-irq.c
@@ -704,17 +704,21 @@ 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)) {
@@ -755,6 +759,8 @@ static void ivtv_irq_vsync(struct ivtv *itv)
 				set_bit(IVTV_F_I_HAVE_WORK, &itv->i_flags);
 			}
 		}
+
+		itv->yuv_info.fields_lapsed ++;
 	}
 }