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Subject[PATCH 3/4] media: aspeed: Correct values for detected timing
Date
Correct timing's fp/sync/bp value based on the information below.
It should be noticed that the calculation formula should be changed
per sync polarity.

The sequence of signal: sync - backporch - video data - frontporch

The following registers start counting from sync's rising edge:
1. VR090: frame edge's left and right
2. VR094: frame edge's top and bottom
3. VR09C: counting from sync's rising edge to falling edge

+--+ +-------------------+ +--+
| | | v i d e o | | |
+--+ +-----+ +-----+ +---+

sync+--+
left/top+--------+
right/bottom+----------------------------+

+-------------------+
| v i d e o |
+--+ +-----+ +-----+ +---+
| | | |
+--+ +--+
sync+-------------------------------+
left/top+-----+
right/bottom+-------------------------+

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
---
drivers/media/platform/aspeed-video.c | 27 ++++++++++++++++++++++-----
1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 581a4261f9b7..5ad3a20c5bac 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -988,10 +988,20 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
src_tb_edge);
video->frame_top = FIELD_GET(VE_SRC_TB_EDGE_DET_TOP,
src_tb_edge);
- det->vfrontporch = video->frame_top;
- det->vbackporch = FIELD_GET(VE_MODE_DETECT_V_LINES, mds) -
- video->frame_bottom;
det->vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
+ if (det->polarities & V4L2_DV_VSYNC_POS_POL) {
+ det->vbackporch = video->frame_top - det->vsync;
+ det->vfrontporch =
+ FIELD_GET(VE_MODE_DETECT_V_LINES, mds) -
+ video->frame_bottom;
+ } else {
+ det->vsync = FIELD_GET(VE_MODE_DETECT_V_LINES, mds) -
+ det->vsync;
+ det->vbackporch = video->frame_top;
+ det->vfrontporch =
+ FIELD_GET(VE_MODE_DETECT_V_LINES, mds) -
+ video->frame_bottom - det->vsync;
+ }
if (video->frame_top > video->frame_bottom)
continue;

@@ -999,9 +1009,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
src_lr_edge);
video->frame_left = FIELD_GET(VE_SRC_LR_EDGE_DET_LEFT,
src_lr_edge);
- det->hfrontporch = video->frame_left;
- det->hbackporch = htotal - video->frame_right;
det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
+ if (det->polarities & V4L2_DV_HSYNC_POS_POL) {
+ det->hbackporch = video->frame_left - det->hsync;
+ det->hfrontporch = htotal - video->frame_right;
+ } else {
+ det->hsync = htotal - det->hsync;
+ det->hbackporch = video->frame_left;
+ det->hfrontporch = htotal - video->frame_right -
+ det->hsync;
+ }
if (video->frame_left > video->frame_right)
continue;

--
2.25.1
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