| Message ID | 20211222082139.26933-4-jammy_huang@aspeedtech.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Correct timing report | expand |
Hi Jammy, I just want to double check this: I assume you have tested this with the various polarity combinations? I ask because I've never seen this before in any other hardware. The sync and porch values reported by hardware are always independent from the polarity, so that's why I am surprised to see this. Same for the next patch (4/4). Regards, Hans On 12/22/21 09:21, Jammy Huang wrote: > 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+-------------------------+ > > Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> > --- > v2: > - Code refined per Joel's suggestion > - Update commit message to have name matching variable > --- > drivers/media/platform/aspeed-video.c | 30 ++++++++++++++++++++------- > 1 file changed, 22 insertions(+), 8 deletions(-) > > diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c > index c241038ee27c..7c50567f5ab0 100644 > --- a/drivers/media/platform/aspeed-video.c > +++ b/drivers/media/platform/aspeed-video.c > @@ -936,7 +936,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) > u32 src_lr_edge; > u32 src_tb_edge; > u32 sync; > - u32 htotal; > + u32 htotal, vtotal, vsync, hsync; > struct v4l2_bt_timings *det = &video->detected_timings; > > det->width = MIN_WIDTH; > @@ -983,21 +983,35 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) > 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); > + 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); > > 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 (det->polarities & V4L2_DV_VSYNC_POS_POL) { > + det->vbackporch = video->frame_top - vsync; > + det->vfrontporch = vtotal - video->frame_bottom; > + det->vsync = vsync; > + } else { > + det->vbackporch = video->frame_top; > + det->vfrontporch = vsync - video->frame_bottom; > + det->vsync = vtotal - vsync; > + } > 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 (det->polarities & V4L2_DV_HSYNC_POS_POL) { > + det->hbackporch = video->frame_left - hsync; > + det->hfrontporch = htotal - video->frame_right; > + det->hsync = hsync; > + } else { > + det->hbackporch = video->frame_left; > + det->hfrontporch = hsync - video->frame_right; > + det->hsync = htotal - hsync; > + } > if (video->frame_left > video->frame_right) > continue; >
Hi Hans, Yes, this is a weird part of our hardware. Because it uses the rising edge of the sync to start counting, an additional calculation is needed to get the exact value of the timings. This problem was found when I was debugging the timing detection unstable problem. Reards, Jammy On 2022/1/20 下午 08:31, Hans Verkuil wrote: > Hi Jammy, > > I just want to double check this: I assume you have tested this with the > various polarity combinations? > > I ask because I've never seen this before in any other hardware. The > sync and porch values reported by hardware are always independent from the > polarity, so that's why I am surprised to see this. > > Same for the next patch (4/4). > > Regards, > > Hans > > On 12/22/21 09:21, Jammy Huang wrote: >> 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+-------------------------+ >> >> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> >> --- >> v2: >> - Code refined per Joel's suggestion >> - Update commit message to have name matching variable >> --- >> drivers/media/platform/aspeed-video.c | 30 ++++++++++++++++++++------- >> 1 file changed, 22 insertions(+), 8 deletions(-) >> >> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c >> index c241038ee27c..7c50567f5ab0 100644 >> --- a/drivers/media/platform/aspeed-video.c >> +++ b/drivers/media/platform/aspeed-video.c >> @@ -936,7 +936,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >> u32 src_lr_edge; >> u32 src_tb_edge; >> u32 sync; >> - u32 htotal; >> + u32 htotal, vtotal, vsync, hsync; >> struct v4l2_bt_timings *det = &video->detected_timings; >> >> det->width = MIN_WIDTH; >> @@ -983,21 +983,35 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >> 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); >> + 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); >> >> 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 (det->polarities & V4L2_DV_VSYNC_POS_POL) { >> + det->vbackporch = video->frame_top - vsync; >> + det->vfrontporch = vtotal - video->frame_bottom; >> + det->vsync = vsync; >> + } else { >> + det->vbackporch = video->frame_top; >> + det->vfrontporch = vsync - video->frame_bottom; >> + det->vsync = vtotal - vsync; >> + } >> 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 (det->polarities & V4L2_DV_HSYNC_POS_POL) { >> + det->hbackporch = video->frame_left - hsync; >> + det->hfrontporch = htotal - video->frame_right; >> + det->hsync = hsync; >> + } else { >> + det->hbackporch = video->frame_left; >> + det->hfrontporch = hsync - video->frame_right; >> + det->hsync = htotal - hsync; >> + } >> if (video->frame_left > video->frame_right) >> continue; >>
Hi Jammy, On 1/21/22 07:01, Jammy Huang wrote: > Hi Hans, > > Yes, this is a weird part of our hardware. > Because it uses the rising edge of the sync to start counting, an additional calculation > is needed to get the exact value of the timings. > > This problem was found when I was debugging the timing detection unstable problem. OK, thank you for the confirmation. I would like a v3 where basically the explanation you made in the cover letter is copied to the code, probably as a comment block just before aspeed_video_get_resolution(). This is unusual enough that it should be documented well in the code. Regards, Hans > > Reards, > > Jammy > > On 2022/1/20 下午 08:31, Hans Verkuil wrote: >> Hi Jammy, >> >> I just want to double check this: I assume you have tested this with the >> various polarity combinations? >> >> I ask because I've never seen this before in any other hardware. The >> sync and porch values reported by hardware are always independent from the >> polarity, so that's why I am surprised to see this. >> >> Same for the next patch (4/4). >> >> Regards, >> >> Hans >> >> On 12/22/21 09:21, Jammy Huang wrote: >>> 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+-------------------------+ >>> >>> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> >>> --- >>> v2: >>> - Code refined per Joel's suggestion >>> - Update commit message to have name matching variable >>> --- >>> drivers/media/platform/aspeed-video.c | 30 ++++++++++++++++++++------- >>> 1 file changed, 22 insertions(+), 8 deletions(-) >>> >>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c >>> index c241038ee27c..7c50567f5ab0 100644 >>> --- a/drivers/media/platform/aspeed-video.c >>> +++ b/drivers/media/platform/aspeed-video.c >>> @@ -936,7 +936,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>> u32 src_lr_edge; >>> u32 src_tb_edge; >>> u32 sync; >>> - u32 htotal; >>> + u32 htotal, vtotal, vsync, hsync; >>> struct v4l2_bt_timings *det = &video->detected_timings; >>> det->width = MIN_WIDTH; >>> @@ -983,21 +983,35 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>> 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); >>> + 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); >>> 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 (det->polarities & V4L2_DV_VSYNC_POS_POL) { >>> + det->vbackporch = video->frame_top - vsync; >>> + det->vfrontporch = vtotal - video->frame_bottom; >>> + det->vsync = vsync; >>> + } else { >>> + det->vbackporch = video->frame_top; >>> + det->vfrontporch = vsync - video->frame_bottom; >>> + det->vsync = vtotal - vsync; >>> + } >>> 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 (det->polarities & V4L2_DV_HSYNC_POS_POL) { >>> + det->hbackporch = video->frame_left - hsync; >>> + det->hfrontporch = htotal - video->frame_right; >>> + det->hsync = hsync; >>> + } else { >>> + det->hbackporch = video->frame_left; >>> + det->hfrontporch = hsync - video->frame_right; >>> + det->hsync = htotal - hsync; >>> + } >>> if (video->frame_left > video->frame_right) >>> continue; >>>
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index c241038ee27c..7c50567f5ab0 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -936,7 +936,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) u32 src_lr_edge; u32 src_tb_edge; u32 sync; - u32 htotal; + u32 htotal, vtotal, vsync, hsync; struct v4l2_bt_timings *det = &video->detected_timings; det->width = MIN_WIDTH; @@ -983,21 +983,35 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) 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); + 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); 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 (det->polarities & V4L2_DV_VSYNC_POS_POL) { + det->vbackporch = video->frame_top - vsync; + det->vfrontporch = vtotal - video->frame_bottom; + det->vsync = vsync; + } else { + det->vbackporch = video->frame_top; + det->vfrontporch = vsync - video->frame_bottom; + det->vsync = vtotal - vsync; + } 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 (det->polarities & V4L2_DV_HSYNC_POS_POL) { + det->hbackporch = video->frame_left - hsync; + det->hfrontporch = htotal - video->frame_right; + det->hsync = hsync; + } else { + det->hbackporch = video->frame_left; + det->hfrontporch = hsync - video->frame_right; + det->hsync = htotal - hsync; + } if (video->frame_left > video->frame_right) continue;
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+-------------------------+ Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> --- v2: - Code refined per Joel's suggestion - Update commit message to have name matching variable --- drivers/media/platform/aspeed-video.c | 30 ++++++++++++++++++++------- 1 file changed, 22 insertions(+), 8 deletions(-)