[PATCH v4 3/3] media: aspeed: Correct values for detected timing
Jammy Huang
jammy_huang at aspeedtech.com
Tue Jan 25 17:44:09 AEDT 2022
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
[Vertical timing]
+--+ +-------------------+ +--+
| | | v i d e o | | |
+--+ +-----+ +-----+ +---+
vsync+--+
frame_top+--------+
frame_bottom+----------------------------+
+-------------------+
| v i d e o |
+--+ +-----+ +-----+ +---+
| | | |
+--+ +--+
vsync+-------------------------------+
frame_top+-----+
frame_bottom+-------------------------+
[Horizontal timing]
+--+ +-------------------+ +--+
| | | v i d e o | | |
+--+ +-----+ +-----+ +---+
hsync+--+
frame_left+--------+
frame_right+----------------------------+
+-------------------+
| v i d e o |
+--+ +-----+ +-----+ +---+
| | | |
+--+ +--+
hsync+-------------------------------+
frame_left+-----+
frame_right+-------------------------+
Ex. 1920x1200 at 60 whose vsync polarity is negative
VR098: c4d3efff, VR09C: 04cc001f
v-total = 0x4D3 (VR098[27:16]) = 1235
v-sync = 0x4CC (VR09C[27:16]) = 1228
Signed-off-by: Jammy Huang <jammy_huang at aspeedtech.com>
---
v4:
- Combine this one with patch 4
v3:
- Add API, aspeed_video_get_timings(), to handle the calculation of timings.
v2:
- Code refined per Joel's suggestion
- Update commit message to have name matching variable
---
drivers/media/platform/aspeed-video.c | 109 +++++++++++++++++++++++---
1 file changed, 97 insertions(+), 12 deletions(-)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index c241038ee27c..90cdc6fe0caa 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -925,6 +925,99 @@ static void aspeed_video_calc_compressed_size(struct aspeed_video *video,
video->max_compressed_size);
}
+/*
+ * Update v4l2_bt_timings per current status.
+ * frame_top/frame_bottom/frame_left/frame_right need to be ready.
+ *
+ * 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
+ *
+ * [Vertical timing]
+ * +--+ +-------------------+ +--+
+ * | | | v i d e o | | |
+ * +--+ +-----+ +-----+ +---+
+ * vsync+--+
+ * frame_top+--------+
+ * frame_bottom+----------------------------+
+ *
+ * +-------------------+
+ * | v i d e o |
+ * +--+ +-----+ +-----+ +---+
+ * | | | |
+ * +--+ +--+
+ * vsync+-------------------------------+
+ * frame_top+-----+
+ * frame_bottom+-------------------------+
+ *
+ * [Horizontal timing]
+ * +--+ +-------------------+ +--+
+ * | | | v i d e o | | |
+ * +--+ +-----+ +-----+ +---+
+ * hsync+--+
+ * frame_left+--------+
+ * frame_right+----------------------------+
+ *
+ * +-------------------+
+ * | v i d e o |
+ * +--+ +-----+ +-----+ +---+
+ * | | | |
+ * +--+ +--+
+ * hsync+-------------------------------+
+ * frame_left+-----+
+ * frame_right+-------------------------+
+ *
+ * @v: the struct of aspeed_video
+ * @det: v4l2_bt_timings to be updated.
+ */
+static void aspeed_video_get_timings(struct aspeed_video *v,
+ struct v4l2_bt_timings *det)
+{
+ u32 mds, sync, htotal, vtotal, vsync, hsync;
+
+ mds = aspeed_video_read(v, VE_MODE_DETECT_STATUS);
+ sync = aspeed_video_read(v, VE_SYNC_STATUS);
+ htotal = aspeed_video_read(v, VE_H_TOTAL_PIXELS);
+ vtotal = FIELD_GET(VE_MODE_DETECT_V_LINES, mds);
+ vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
+ hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
+
+ /*
+ * This is a workaround for polarity detection.
+ * Because ast-soc counts sync from sync's rising edge, the reg value
+ * of sync would be larger than video's active area if negative.
+ */
+ if (vsync > det->height)
+ det->polarities &= ~V4L2_DV_VSYNC_POS_POL;
+ else
+ det->polarities |= V4L2_DV_VSYNC_POS_POL;
+ if (hsync > det->width)
+ det->polarities &= ~V4L2_DV_HSYNC_POS_POL;
+ else
+ det->polarities |= V4L2_DV_HSYNC_POS_POL;
+
+ if (det->polarities & V4L2_DV_VSYNC_POS_POL) {
+ det->vbackporch = v->frame_top - vsync;
+ det->vfrontporch = vtotal - v->frame_bottom;
+ det->vsync = vsync;
+ } else {
+ det->vbackporch = v->frame_top;
+ det->vfrontporch = vsync - v->frame_bottom;
+ det->vsync = vtotal - vsync;
+ }
+
+ if (det->polarities & V4L2_DV_HSYNC_POS_POL) {
+ det->hbackporch = v->frame_left - hsync;
+ det->hfrontporch = htotal - v->frame_right;
+ det->hsync = hsync;
+ } else {
+ det->hbackporch = v->frame_left;
+ det->hfrontporch = hsync - v->frame_right;
+ det->hsync = htotal - hsync;
+ }
+}
+
#define res_check(v) test_and_clear_bit(VIDEO_MODE_DETECT_DONE, &(v)->flags)
static void aspeed_video_get_resolution(struct aspeed_video *video)
@@ -935,8 +1028,6 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
u32 mds;
u32 src_lr_edge;
u32 src_tb_edge;
- u32 sync;
- u32 htotal;
struct v4l2_bt_timings *det = &video->detected_timings;
det->width = MIN_WIDTH;
@@ -980,24 +1071,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
src_lr_edge = aspeed_video_read(video, VE_SRC_LR_EDGE_DET);
src_tb_edge = aspeed_video_read(video, VE_SRC_TB_EDGE_DET);
- mds = aspeed_video_read(video, VE_MODE_DETECT_STATUS);
- sync = aspeed_video_read(video, VE_SYNC_STATUS);
- htotal = aspeed_video_read(video, VE_H_TOTAL_PIXELS);
video->frame_bottom = FIELD_GET(VE_SRC_TB_EDGE_DET_BOT, 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 (video->frame_top > video->frame_bottom)
continue;
video->frame_right = FIELD_GET(VE_SRC_LR_EDGE_DET_RT, 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 (video->frame_left > video->frame_right)
continue;
@@ -1013,6 +1096,8 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
det->width = (video->frame_right - video->frame_left) + 1;
video->v4l2_input_status = 0;
+ aspeed_video_get_timings(video, det);
+
/*
* Enable mode-detect watchdog, resolution-change watchdog and
* automatic compression after frame capture.
--
2.25.1
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