| Message ID | 20211222082139.26933-5-jammy_huang@aspeedtech.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Correct timing report | expand |
On 12/22/21 09:21, Jammy Huang wrote: > This is a workaround for sync polarity unstable. > Sync value get by VR09C counts from sync's rising edge, which means > sync's polarity is negative if sync value is bigger than total/2. Do you have an example of such a format, or is this mostly theoretical? Either provide the example or make a note that it is theoretical. Regards, Hans > > Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> > --- > v2: > - Use 'total/2' rather than 'total<<1' > - Update comment > --- > drivers/media/platform/aspeed-video.c | 20 ++++++++++++++++++++ > 1 file changed, 20 insertions(+) > > diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c > index 7c50567f5ab0..c3e3343d91e1 100644 > --- a/drivers/media/platform/aspeed-video.c > +++ b/drivers/media/platform/aspeed-video.c > @@ -989,6 +989,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) > > 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); > + > + /* > + * This is a workaround for polarity detection when the sync > + * value is larger than half. > + */ > + if (vsync > (vtotal / 2)) > + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; > + else > + det->polarities |= V4L2_DV_VSYNC_POS_POL; > + > if (det->polarities & V4L2_DV_VSYNC_POS_POL) { > det->vbackporch = video->frame_top - vsync; > det->vfrontporch = vtotal - video->frame_bottom; > @@ -1003,6 +1013,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) > > 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); > + > + /* > + * This is a workaround for polarity detection when the sync > + * value is larger than half. > + */ > + if (hsync > (htotal / 2)) > + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; > + else > + det->polarities |= V4L2_DV_HSYNC_POS_POL; > + > if (det->polarities & V4L2_DV_HSYNC_POS_POL) { > det->hbackporch = video->frame_left - hsync; > det->hfrontporch = htotal - video->frame_right;
On 2022/1/21 下午 03:30, Hans Verkuil wrote: > On 12/22/21 09:21, Jammy Huang wrote: >> This is a workaround for sync polarity unstable. >> Sync value get by VR09C counts from sync's rising edge, which means >> sync's polarity is negative if sync value is bigger than total/2. > Do you have an example of such a format, or is this mostly theoretical? > > Either provide the example or make a note that it is theoretical. OK, I will update an example in next patch. Let me explain first. This is a must-be result. Please refer to the graph below as I sent in 3/4 of this series. For negative sync, sync width equals to back porch + data enable + front porch. Thus, sync would be bigger than 90% of total in most cases. +-------------------+ | v i d e o | +--+ +-----+ +-----+ +---+ | | | | +--+ +--+ vsync+-------------------------------+ frame_top+-----+ frame_bottom+-------------------------+ Following registers are what I got for 1920x1200@60. 1e700090: 07ee206f 04c9001a c4d3efff 04cc001f 1e7000a0: 0000081f 00000000 00000000 00000000 vertical total = 0x4D3 (VR098[27:16]) = 1235 vertical sync = 0x4CC (VR09C[27:16]) = 1228 > > Regards, > > Hans > >> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> >> --- >> v2: >> - Use 'total/2' rather than 'total<<1' >> - Update comment >> --- >> drivers/media/platform/aspeed-video.c | 20 ++++++++++++++++++++ >> 1 file changed, 20 insertions(+) >> >> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c >> index 7c50567f5ab0..c3e3343d91e1 100644 >> --- a/drivers/media/platform/aspeed-video.c >> +++ b/drivers/media/platform/aspeed-video.c >> @@ -989,6 +989,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >> >> 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); >> + >> + /* >> + * This is a workaround for polarity detection when the sync >> + * value is larger than half. >> + */ >> + if (vsync > (vtotal / 2)) >> + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; >> + else >> + det->polarities |= V4L2_DV_VSYNC_POS_POL; >> + >> if (det->polarities & V4L2_DV_VSYNC_POS_POL) { >> det->vbackporch = video->frame_top - vsync; >> det->vfrontporch = vtotal - video->frame_bottom; >> @@ -1003,6 +1013,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >> >> 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); >> + >> + /* >> + * This is a workaround for polarity detection when the sync >> + * value is larger than half. >> + */ >> + if (hsync > (htotal / 2)) >> + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; >> + else >> + det->polarities |= V4L2_DV_HSYNC_POS_POL; >> + >> if (det->polarities & V4L2_DV_HSYNC_POS_POL) { >> det->hbackporch = video->frame_left - hsync; >> det->hfrontporch = htotal - video->frame_right;
On 24/01/2022 03:29, Jammy Huang wrote: > > On 2022/1/21 下午 03:30, Hans Verkuil wrote: >> On 12/22/21 09:21, Jammy Huang wrote: >>> This is a workaround for sync polarity unstable. >>> Sync value get by VR09C counts from sync's rising edge, which means >>> sync's polarity is negative if sync value is bigger than total/2. >> Do you have an example of such a format, or is this mostly theoretical? >> >> Either provide the example or make a note that it is theoretical. > > OK, I will update an example in next patch. Let me explain first. > > This is a must-be result. Please refer to the graph below as I sent in 3/4 of this > series. For negative sync, sync width equals to back porch + data enable + front porch. > Thus, sync would be bigger than 90% of total in most cases. Right, I suspected that might be the case. I think it would be better to combine patches 3 and 4 into a single patch, since they are closely related and it is actually easier to understand if it's just a single patch. Regards, Hans > > +-------------------+ > | v i d e o | > +--+ +-----+ +-----+ +---+ > | | | | > +--+ +--+ > vsync+-------------------------------+ > frame_top+-----+ > frame_bottom+-------------------------+ > > > Following registers are what I got for 1920x1200@60. > > 1e700090: 07ee206f 04c9001a c4d3efff 04cc001f > > 1e7000a0: 0000081f 00000000 00000000 00000000 > > vertical total = 0x4D3 (VR098[27:16]) = 1235 > vertical sync = 0x4CC (VR09C[27:16]) = 1228 > >> >> Regards, >> >> Hans >> >>> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> >>> --- >>> v2: >>> - Use 'total/2' rather than 'total<<1' >>> - Update comment >>> --- >>> drivers/media/platform/aspeed-video.c | 20 ++++++++++++++++++++ >>> 1 file changed, 20 insertions(+) >>> >>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c >>> index 7c50567f5ab0..c3e3343d91e1 100644 >>> --- a/drivers/media/platform/aspeed-video.c >>> +++ b/drivers/media/platform/aspeed-video.c >>> @@ -989,6 +989,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>> 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); >>> + >>> + /* >>> + * This is a workaround for polarity detection when the sync >>> + * value is larger than half. >>> + */ >>> + if (vsync > (vtotal / 2)) >>> + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; >>> + else >>> + det->polarities |= V4L2_DV_VSYNC_POS_POL; >>> + >>> if (det->polarities & V4L2_DV_VSYNC_POS_POL) { >>> det->vbackporch = video->frame_top - vsync; >>> det->vfrontporch = vtotal - video->frame_bottom; >>> @@ -1003,6 +1013,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>> 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); >>> + >>> + /* >>> + * This is a workaround for polarity detection when the sync >>> + * value is larger than half. >>> + */ >>> + if (hsync > (htotal / 2)) >>> + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; >>> + else >>> + det->polarities |= V4L2_DV_HSYNC_POS_POL; >>> + >>> if (det->polarities & V4L2_DV_HSYNC_POS_POL) { >>> det->hbackporch = video->frame_left - hsync; >>> det->hfrontporch = htotal - video->frame_right; >
On 2022/1/24 下午 06:22, Hans Verkuil wrote: > On 24/01/2022 03:29, Jammy Huang wrote: >> On 2022/1/21 下午 03:30, Hans Verkuil wrote: >>> On 12/22/21 09:21, Jammy Huang wrote: >>>> This is a workaround for sync polarity unstable. >>>> Sync value get by VR09C counts from sync's rising edge, which means >>>> sync's polarity is negative if sync value is bigger than total/2. >>> Do you have an example of such a format, or is this mostly theoretical? >>> >>> Either provide the example or make a note that it is theoretical. >> OK, I will update an example in next patch. Let me explain first. >> >> This is a must-be result. Please refer to the graph below as I sent in 3/4 of this >> series. For negative sync, sync width equals to back porch + data enable + front porch. >> Thus, sync would be bigger than 90% of total in most cases. > Right, I suspected that might be the case. > > I think it would be better to combine patches 3 and 4 into a single > patch, since they are closely related and it is actually easier to > understand if it's just a single patch. OK, I will combine 3/4 into a single patch in next series. Thanks. Best Regards, Jammy > > Regards, > > Hans > >> +-------------------+ >> | v i d e o | >> +--+ +-----+ +-----+ +---+ >> | | | | >> +--+ +--+ >> vsync+-------------------------------+ >> frame_top+-----+ >> frame_bottom+-------------------------+ >> >> >> Following registers are what I got for 1920x1200@60. >> >> 1e700090: 07ee206f 04c9001a c4d3efff 04cc001f >> >> 1e7000a0: 0000081f 00000000 00000000 00000000 >> >> vertical total = 0x4D3 (VR098[27:16]) = 1235 >> vertical sync = 0x4CC (VR09C[27:16]) = 1228 >> >>> Regards, >>> >>> Hans >>> >>>> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> >>>> --- >>>> v2: >>>> - Use 'total/2' rather than 'total<<1' >>>> - Update comment >>>> --- >>>> drivers/media/platform/aspeed-video.c | 20 ++++++++++++++++++++ >>>> 1 file changed, 20 insertions(+) >>>> >>>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c >>>> index 7c50567f5ab0..c3e3343d91e1 100644 >>>> --- a/drivers/media/platform/aspeed-video.c >>>> +++ b/drivers/media/platform/aspeed-video.c >>>> @@ -989,6 +989,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>>> 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); >>>> + >>>> + /* >>>> + * This is a workaround for polarity detection when the sync >>>> + * value is larger than half. >>>> + */ >>>> + if (vsync > (vtotal / 2)) >>>> + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; >>>> + else >>>> + det->polarities |= V4L2_DV_VSYNC_POS_POL; >>>> + >>>> if (det->polarities & V4L2_DV_VSYNC_POS_POL) { >>>> det->vbackporch = video->frame_top - vsync; >>>> det->vfrontporch = vtotal - video->frame_bottom; >>>> @@ -1003,6 +1013,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) >>>> 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); >>>> + >>>> + /* >>>> + * This is a workaround for polarity detection when the sync >>>> + * value is larger than half. >>>> + */ >>>> + if (hsync > (htotal / 2)) >>>> + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; >>>> + else >>>> + det->polarities |= V4L2_DV_HSYNC_POS_POL; >>>> + >>>> if (det->polarities & V4L2_DV_HSYNC_POS_POL) { >>>> det->hbackporch = video->frame_left - hsync; >>>> det->hfrontporch = htotal - video->frame_right;
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c index 7c50567f5ab0..c3e3343d91e1 100644 --- a/drivers/media/platform/aspeed-video.c +++ b/drivers/media/platform/aspeed-video.c @@ -989,6 +989,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) 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); + + /* + * This is a workaround for polarity detection when the sync + * value is larger than half. + */ + if (vsync > (vtotal / 2)) + det->polarities &= ~V4L2_DV_VSYNC_POS_POL; + else + det->polarities |= V4L2_DV_VSYNC_POS_POL; + if (det->polarities & V4L2_DV_VSYNC_POS_POL) { det->vbackporch = video->frame_top - vsync; det->vfrontporch = vtotal - video->frame_bottom; @@ -1003,6 +1013,16 @@ static void aspeed_video_get_resolution(struct aspeed_video *video) 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); + + /* + * This is a workaround for polarity detection when the sync + * value is larger than half. + */ + if (hsync > (htotal / 2)) + det->polarities &= ~V4L2_DV_HSYNC_POS_POL; + else + det->polarities |= V4L2_DV_HSYNC_POS_POL; + if (det->polarities & V4L2_DV_HSYNC_POS_POL) { det->hbackporch = video->frame_left - hsync; det->hfrontporch = htotal - video->frame_right;
This is a workaround for sync polarity unstable. Sync value get by VR09C counts from sync's rising edge, which means sync's polarity is negative if sync value is bigger than total/2. Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com> --- v2: - Use 'total/2' rather than 'total<<1' - Update comment --- drivers/media/platform/aspeed-video.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)