* [PATCH 1/4] media: aspeed: Correct value for h-total-pixels
2021-12-17 9:53 [PATCH 0/4] Correct timing report Jammy Huang
@ 2021-12-17 9:54 ` Jammy Huang
2021-12-22 0:54 ` Joel Stanley
2021-12-17 9:54 ` [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability Jammy Huang
` (2 subsequent siblings)
3 siblings, 1 reply; 12+ messages in thread
From: Jammy Huang @ 2021-12-17 9:54 UTC (permalink / raw)
To: eajames, mchehab, joel, andrew, linux-media, openbmc,
linux-arm-kernel, linux-aspeed, linux-kernel
Previous reg-field, 0x98[11:0], stands for the period of the detected
hsync signal.
Use the correct reg, 0xa0, to get h-total in pixels.
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
---
drivers/media/platform/aspeed-video.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index b388bc56ce81..d5f77b205175 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -166,7 +166,7 @@
#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
#define VE_MODE_DETECT_STATUS 0x098
-#define VE_MODE_DETECT_H_PIXELS GENMASK(11, 0)
+#define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
#define VE_MODE_DETECT_V_LINES_SHF 16
#define VE_MODE_DETECT_V_LINES GENMASK(27, VE_MODE_DETECT_V_LINES_SHF)
#define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
@@ -177,6 +177,8 @@
#define VE_SYNC_STATUS_VSYNC_SHF 16
#define VE_SYNC_STATUS_VSYNC GENMASK(27, VE_SYNC_STATUS_VSYNC_SHF)
+#define VE_H_TOTAL_PIXELS 0x0A0
+
#define VE_INTERRUPT_CTRL 0x304
#define VE_INTERRUPT_STATUS 0x308
#define VE_INTERRUPT_MODE_DETECT_WD BIT(0)
@@ -938,6 +940,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
u32 src_lr_edge;
u32 src_tb_edge;
u32 sync;
+ u32 htotal;
struct v4l2_bt_timings *det = &video->detected_timings;
det->width = MIN_WIDTH;
@@ -983,6 +986,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
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 = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
VE_SRC_TB_EDGE_DET_BOT_SHF;
@@ -999,8 +1003,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
VE_SRC_LR_EDGE_DET_RT_SHF;
video->frame_left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
det->hfrontporch = video->frame_left;
- det->hbackporch = (mds & VE_MODE_DETECT_H_PIXELS) -
- video->frame_right;
+ det->hbackporch = htotal - video->frame_right;
det->hsync = sync & VE_SYNC_STATUS_HSYNC;
if (video->frame_left > video->frame_right)
continue;
--
2.25.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH 1/4] media: aspeed: Correct value for h-total-pixels
2021-12-17 9:54 ` [PATCH 1/4] media: aspeed: Correct value for h-total-pixels Jammy Huang
@ 2021-12-22 0:54 ` Joel Stanley
0 siblings, 0 replies; 12+ messages in thread
From: Joel Stanley @ 2021-12-22 0:54 UTC (permalink / raw)
To: Jammy Huang
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery, linux-media,
OpenBMC Maillist, Linux ARM, linux-aspeed,
Linux Kernel Mailing List
On Fri, 17 Dec 2021 at 09:54, Jammy Huang <jammy_huang@aspeedtech.com> wrote:
>
> Previous reg-field, 0x98[11:0], stands for the period of the detected
> hsync signal.
> Use the correct reg, 0xa0, to get h-total in pixels.
>
> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Fixes: d2b4387f3bdf ("media: platform: Add Aspeed Video Engine driver")
Reviewed-by: Joel Stanley <joel@jms.id.au>
> ---
> drivers/media/platform/aspeed-video.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index b388bc56ce81..d5f77b205175 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -166,7 +166,7 @@
> #define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
>
> #define VE_MODE_DETECT_STATUS 0x098
> -#define VE_MODE_DETECT_H_PIXELS GENMASK(11, 0)
> +#define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
> #define VE_MODE_DETECT_V_LINES_SHF 16
> #define VE_MODE_DETECT_V_LINES GENMASK(27, VE_MODE_DETECT_V_LINES_SHF)
> #define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
> @@ -177,6 +177,8 @@
> #define VE_SYNC_STATUS_VSYNC_SHF 16
> #define VE_SYNC_STATUS_VSYNC GENMASK(27, VE_SYNC_STATUS_VSYNC_SHF)
>
> +#define VE_H_TOTAL_PIXELS 0x0A0
> +
> #define VE_INTERRUPT_CTRL 0x304
> #define VE_INTERRUPT_STATUS 0x308
> #define VE_INTERRUPT_MODE_DETECT_WD BIT(0)
> @@ -938,6 +940,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> u32 src_lr_edge;
> u32 src_tb_edge;
> u32 sync;
> + u32 htotal;
> struct v4l2_bt_timings *det = &video->detected_timings;
>
> det->width = MIN_WIDTH;
> @@ -983,6 +986,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> 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 = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
> VE_SRC_TB_EDGE_DET_BOT_SHF;
> @@ -999,8 +1003,7 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> VE_SRC_LR_EDGE_DET_RT_SHF;
> video->frame_left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
> det->hfrontporch = video->frame_left;
> - det->hbackporch = (mds & VE_MODE_DETECT_H_PIXELS) -
> - video->frame_right;
> + det->hbackporch = htotal - video->frame_right;
> det->hsync = sync & VE_SYNC_STATUS_HSYNC;
> if (video->frame_left > video->frame_right)
> continue;
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability
2021-12-17 9:53 [PATCH 0/4] Correct timing report Jammy Huang
2021-12-17 9:54 ` [PATCH 1/4] media: aspeed: Correct value for h-total-pixels Jammy Huang
@ 2021-12-17 9:54 ` Jammy Huang
2021-12-22 0:59 ` Joel Stanley
2021-12-17 9:54 ` [PATCH 3/4] media: aspeed: Correct values for detected timing Jammy Huang
2021-12-17 9:54 ` [PATCH 4/4] media: aspeed: Fix timing polarity incorrect Jammy Huang
3 siblings, 1 reply; 12+ messages in thread
From: Jammy Huang @ 2021-12-17 9:54 UTC (permalink / raw)
To: eajames, mchehab, joel, andrew, linux-media, openbmc,
linux-arm-kernel, linux-aspeed, linux-kernel
Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask in
one go for reg values.
Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
---
drivers/media/platform/aspeed-video.c | 35 ++++++++++++---------------
1 file changed, 16 insertions(+), 19 deletions(-)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index d5f77b205175..581a4261f9b7 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -156,26 +156,22 @@
#define VE_SRC_LR_EDGE_DET_NO_H BIT(13)
#define VE_SRC_LR_EDGE_DET_NO_DISP BIT(14)
#define VE_SRC_LR_EDGE_DET_NO_CLK BIT(15)
-#define VE_SRC_LR_EDGE_DET_RT_SHF 16
-#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, VE_SRC_LR_EDGE_DET_RT_SHF)
+#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, 16)
#define VE_SRC_LR_EDGE_DET_INTERLACE BIT(31)
#define VE_SRC_TB_EDGE_DET 0x094
#define VE_SRC_TB_EDGE_DET_TOP GENMASK(12, 0)
-#define VE_SRC_TB_EDGE_DET_BOT_SHF 16
-#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
+#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, 16)
#define VE_MODE_DETECT_STATUS 0x098
#define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
-#define VE_MODE_DETECT_V_LINES_SHF 16
-#define VE_MODE_DETECT_V_LINES GENMASK(27, VE_MODE_DETECT_V_LINES_SHF)
+#define VE_MODE_DETECT_V_LINES GENMASK(27, 16)
#define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
#define VE_MODE_DETECT_STATUS_HSYNC BIT(29)
#define VE_SYNC_STATUS 0x09c
#define VE_SYNC_STATUS_HSYNC GENMASK(11, 0)
-#define VE_SYNC_STATUS_VSYNC_SHF 16
-#define VE_SYNC_STATUS_VSYNC GENMASK(27, VE_SYNC_STATUS_VSYNC_SHF)
+#define VE_SYNC_STATUS_VSYNC GENMASK(27, 16)
#define VE_H_TOTAL_PIXELS 0x0A0
@@ -988,23 +984,24 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
sync = aspeed_video_read(video, VE_SYNC_STATUS);
htotal = aspeed_video_read(video, VE_H_TOTAL_PIXELS);
- video->frame_bottom = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
- VE_SRC_TB_EDGE_DET_BOT_SHF;
- video->frame_top = src_tb_edge & VE_SRC_TB_EDGE_DET_TOP;
+ 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 = ((mds & VE_MODE_DETECT_V_LINES) >>
- VE_MODE_DETECT_V_LINES_SHF) - video->frame_bottom;
- det->vsync = (sync & VE_SYNC_STATUS_VSYNC) >>
- VE_SYNC_STATUS_VSYNC_SHF;
+ 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 = (src_lr_edge & VE_SRC_LR_EDGE_DET_RT) >>
- VE_SRC_LR_EDGE_DET_RT_SHF;
- video->frame_left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
+ 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 = sync & VE_SYNC_STATUS_HSYNC;
+ det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
if (video->frame_left > video->frame_right)
continue;
--
2.25.1
^ permalink raw reply related [flat|nested] 12+ messages in thread
* Re: [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability
2021-12-17 9:54 ` [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability Jammy Huang
@ 2021-12-22 0:59 ` Joel Stanley
2021-12-22 6:10 ` Jammy Huang
0 siblings, 1 reply; 12+ messages in thread
From: Joel Stanley @ 2021-12-22 0:59 UTC (permalink / raw)
To: Jammy Huang
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery, linux-media,
OpenBMC Maillist, Linux ARM, linux-aspeed,
Linux Kernel Mailing List
On Fri, 17 Dec 2021 at 09:53, Jammy Huang <jammy_huang@aspeedtech.com> wrote:
>
> Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask in
> one go for reg values.
>
> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
> ---
> drivers/media/platform/aspeed-video.c | 35 ++++++++++++---------------
> 1 file changed, 16 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index d5f77b205175..581a4261f9b7 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -156,26 +156,22 @@
> #define VE_SRC_LR_EDGE_DET_NO_H BIT(13)
> #define VE_SRC_LR_EDGE_DET_NO_DISP BIT(14)
> #define VE_SRC_LR_EDGE_DET_NO_CLK BIT(15)
> -#define VE_SRC_LR_EDGE_DET_RT_SHF 16
> -#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, VE_SRC_LR_EDGE_DET_RT_SHF)
> +#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, 16)
> #define VE_SRC_LR_EDGE_DET_INTERLACE BIT(31)
>
> #define VE_SRC_TB_EDGE_DET 0x094
> #define VE_SRC_TB_EDGE_DET_TOP GENMASK(12, 0)
> -#define VE_SRC_TB_EDGE_DET_BOT_SHF 16
> -#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
> +#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, 16)
>
> #define VE_MODE_DETECT_STATUS 0x098
> #define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
> -#define VE_MODE_DETECT_V_LINES_SHF 16
> -#define VE_MODE_DETECT_V_LINES GENMASK(27, VE_MODE_DETECT_V_LINES_SHF)
> +#define VE_MODE_DETECT_V_LINES GENMASK(27, 16)
> #define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
> #define VE_MODE_DETECT_STATUS_HSYNC BIT(29)
>
> #define VE_SYNC_STATUS 0x09c
> #define VE_SYNC_STATUS_HSYNC GENMASK(11, 0)
> -#define VE_SYNC_STATUS_VSYNC_SHF 16
> -#define VE_SYNC_STATUS_VSYNC GENMASK(27, VE_SYNC_STATUS_VSYNC_SHF)
> +#define VE_SYNC_STATUS_VSYNC GENMASK(27, 16)
>
> #define VE_H_TOTAL_PIXELS 0x0A0
>
> @@ -988,23 +984,24 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> sync = aspeed_video_read(video, VE_SYNC_STATUS);
> htotal = aspeed_video_read(video, VE_H_TOTAL_PIXELS);
>
> - video->frame_bottom = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
> - VE_SRC_TB_EDGE_DET_BOT_SHF;
> - video->frame_top = src_tb_edge & VE_SRC_TB_EDGE_DET_TOP;
> + 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 = ((mds & VE_MODE_DETECT_V_LINES) >>
> - VE_MODE_DETECT_V_LINES_SHF) - video->frame_bottom;
> - det->vsync = (sync & VE_SYNC_STATUS_VSYNC) >>
> - VE_SYNC_STATUS_VSYNC_SHF;
> + 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 = (src_lr_edge & VE_SRC_LR_EDGE_DET_RT) >>
> - VE_SRC_LR_EDGE_DET_RT_SHF;
> - video->frame_left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
> + 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);
I suggest putting these on one line to further improve readability:
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);
The same for the other lines you've changed above.
And then add:
Reviewed-by: Joel Stanley <joel@jms.id.au>
> det->hfrontporch = video->frame_left;
> det->hbackporch = htotal - video->frame_right;
> - det->hsync = sync & VE_SYNC_STATUS_HSYNC;
> + det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
> if (video->frame_left > video->frame_right)
> continue;
>
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability
2021-12-22 0:59 ` Joel Stanley
@ 2021-12-22 6:10 ` Jammy Huang
0 siblings, 0 replies; 12+ messages in thread
From: Jammy Huang @ 2021-12-22 6:10 UTC (permalink / raw)
To: Joel Stanley
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery,
linux-media@vger.kernel.org, OpenBMC Maillist, Linux ARM,
linux-aspeed, Linux Kernel Mailing List
Hi Joel,
OK, I will update in next patch as you advised.
Thanks for your review.
On 2021/12/22 上午 08:59, Joel Stanley wrote:
> On Fri, 17 Dec 2021 at 09:53, Jammy Huang <jammy_huang@aspeedtech.com> wrote:
>> Use the bitfield macro FIELD_GET, and GENMASK to do the shift and mask in
>> one go for reg values.
>>
>> Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
>> ---
>> drivers/media/platform/aspeed-video.c | 35 ++++++++++++---------------
>> 1 file changed, 16 insertions(+), 19 deletions(-)
>>
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index d5f77b205175..581a4261f9b7 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -156,26 +156,22 @@
>> #define VE_SRC_LR_EDGE_DET_NO_H BIT(13)
>> #define VE_SRC_LR_EDGE_DET_NO_DISP BIT(14)
>> #define VE_SRC_LR_EDGE_DET_NO_CLK BIT(15)
>> -#define VE_SRC_LR_EDGE_DET_RT_SHF 16
>> -#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, VE_SRC_LR_EDGE_DET_RT_SHF)
>> +#define VE_SRC_LR_EDGE_DET_RT GENMASK(27, 16)
>> #define VE_SRC_LR_EDGE_DET_INTERLACE BIT(31)
>>
>> #define VE_SRC_TB_EDGE_DET 0x094
>> #define VE_SRC_TB_EDGE_DET_TOP GENMASK(12, 0)
>> -#define VE_SRC_TB_EDGE_DET_BOT_SHF 16
>> -#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, VE_SRC_TB_EDGE_DET_BOT_SHF)
>> +#define VE_SRC_TB_EDGE_DET_BOT GENMASK(28, 16)
>>
>> #define VE_MODE_DETECT_STATUS 0x098
>> #define VE_MODE_DETECT_H_PERIOD GENMASK(11, 0)
>> -#define VE_MODE_DETECT_V_LINES_SHF 16
>> -#define VE_MODE_DETECT_V_LINES GENMASK(27, VE_MODE_DETECT_V_LINES_SHF)
>> +#define VE_MODE_DETECT_V_LINES GENMASK(27, 16)
>> #define VE_MODE_DETECT_STATUS_VSYNC BIT(28)
>> #define VE_MODE_DETECT_STATUS_HSYNC BIT(29)
>>
>> #define VE_SYNC_STATUS 0x09c
>> #define VE_SYNC_STATUS_HSYNC GENMASK(11, 0)
>> -#define VE_SYNC_STATUS_VSYNC_SHF 16
>> -#define VE_SYNC_STATUS_VSYNC GENMASK(27, VE_SYNC_STATUS_VSYNC_SHF)
>> +#define VE_SYNC_STATUS_VSYNC GENMASK(27, 16)
>>
>> #define VE_H_TOTAL_PIXELS 0x0A0
>>
>> @@ -988,23 +984,24 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
>> sync = aspeed_video_read(video, VE_SYNC_STATUS);
>> htotal = aspeed_video_read(video, VE_H_TOTAL_PIXELS);
>>
>> - video->frame_bottom = (src_tb_edge & VE_SRC_TB_EDGE_DET_BOT) >>
>> - VE_SRC_TB_EDGE_DET_BOT_SHF;
>> - video->frame_top = src_tb_edge & VE_SRC_TB_EDGE_DET_TOP;
>> + 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 = ((mds & VE_MODE_DETECT_V_LINES) >>
>> - VE_MODE_DETECT_V_LINES_SHF) - video->frame_bottom;
>> - det->vsync = (sync & VE_SYNC_STATUS_VSYNC) >>
>> - VE_SYNC_STATUS_VSYNC_SHF;
>> + 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 = (src_lr_edge & VE_SRC_LR_EDGE_DET_RT) >>
>> - VE_SRC_LR_EDGE_DET_RT_SHF;
>> - video->frame_left = src_lr_edge & VE_SRC_LR_EDGE_DET_LEFT;
>> + 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);
> I suggest putting these on one line to further improve readability:
>
> 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);
>
> The same for the other lines you've changed above.
>
> And then add:
>
> Reviewed-by: Joel Stanley <joel@jms.id.au>
>
>> det->hfrontporch = video->frame_left;
>> det->hbackporch = htotal - video->frame_right;
>> - det->hsync = sync & VE_SYNC_STATUS_HSYNC;
>> + det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
>> if (video->frame_left > video->frame_right)
>> continue;
>>
>> --
>> 2.25.1
>>
--
Best Regards
Jammy
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 3/4] media: aspeed: Correct values for detected timing
2021-12-17 9:53 [PATCH 0/4] Correct timing report Jammy Huang
2021-12-17 9:54 ` [PATCH 1/4] media: aspeed: Correct value for h-total-pixels Jammy Huang
2021-12-17 9:54 ` [PATCH 2/4] media: aspeed: Use FIELD_GET to improve readability Jammy Huang
@ 2021-12-17 9:54 ` Jammy Huang
2021-12-22 1:31 ` Joel Stanley
2021-12-17 9:54 ` [PATCH 4/4] media: aspeed: Fix timing polarity incorrect Jammy Huang
3 siblings, 1 reply; 12+ messages in thread
From: Jammy Huang @ 2021-12-17 9:54 UTC (permalink / raw)
To: eajames, mchehab, joel, andrew, linux-media, openbmc,
linux-arm-kernel, linux-aspeed, linux-kernel
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
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH 3/4] media: aspeed: Correct values for detected timing
2021-12-17 9:54 ` [PATCH 3/4] media: aspeed: Correct values for detected timing Jammy Huang
@ 2021-12-22 1:31 ` Joel Stanley
2021-12-22 6:11 ` Jammy Huang
0 siblings, 1 reply; 12+ messages in thread
From: Joel Stanley @ 2021-12-22 1:31 UTC (permalink / raw)
To: Jammy Huang
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery, linux-media,
OpenBMC Maillist, Linux ARM, linux-aspeed,
Linux Kernel Mailing List
On Fri, 17 Dec 2021 at 09:54, Jammy Huang <jammy_huang@aspeedtech.com> 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
>
> +--+ +-------------------+ +--+
> | | | v i d e o | | |
> +--+ +-----+ +-----+ +---+
>
> sync+--+
> left/top+--------+
> right/bottom+----------------------------+
>
> +-------------------+
> | v i d e o |
> +--+ +-----+ +-----+ +---+
> | | | |
> +--+ +--+
> sync+-------------------------------+
> left/top+-----+
> right/bottom+-------------------------+
This is a good explanation. Can you add detail that relates the names
you use here to to the variable names in your patch (or change them to
match)?
>
> 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);
Would it be clearer if you structured the code like this?
vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
vlines = FIELD_GET(VE_MODE_DETECT_V_LINES, mds);
if (det->polarities & V4L2_DV_VSYNC_POS_POL)) {
det->vbackporch = video->frame_top - vsync;
det->vfrontporch = vlines - video->frame_bottom;
det->vsync = vsync;
} else {
det->vbackporch = video->frame_top;
det->vfrontporch = vlines - video->frame_bottom - vsync;
det->vsync = vlines - vsync;
}
> + 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
>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: [PATCH 3/4] media: aspeed: Correct values for detected timing
2021-12-22 1:31 ` Joel Stanley
@ 2021-12-22 6:11 ` Jammy Huang
0 siblings, 0 replies; 12+ messages in thread
From: Jammy Huang @ 2021-12-22 6:11 UTC (permalink / raw)
To: Joel Stanley
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery,
linux-media@vger.kernel.org, OpenBMC Maillist, Linux ARM,
linux-aspeed, Linux Kernel Mailing List
Hi Joel,
OK, I will update in next patch as you advised.
Thanks for your review.
On 2021/12/22 上午 09:31, Joel Stanley wrote:
> On Fri, 17 Dec 2021 at 09:54, Jammy Huang <jammy_huang@aspeedtech.com> 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
>>
>> +--+ +-------------------+ +--+
>> | | | v i d e o | | |
>> +--+ +-----+ +-----+ +---+
>>
>> sync+--+
>> left/top+--------+
>> right/bottom+----------------------------+
>>
>> +-------------------+
>> | v i d e o |
>> +--+ +-----+ +-----+ +---+
>> | | | |
>> +--+ +--+
>> sync+-------------------------------+
>> left/top+-----+
>> right/bottom+-------------------------+
> This is a good explanation. Can you add detail that relates the names
> you use here to to the variable names in your patch (or change them to
> match)?
>
>> 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);
>
> Would it be clearer if you structured the code like this?
>
> vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
> vlines = FIELD_GET(VE_MODE_DETECT_V_LINES, mds);
>
> if (det->polarities & V4L2_DV_VSYNC_POS_POL)) {
> det->vbackporch = video->frame_top - vsync;
> det->vfrontporch = vlines - video->frame_bottom;
> det->vsync = vsync;
> } else {
> det->vbackporch = video->frame_top;
> det->vfrontporch = vlines - video->frame_bottom - vsync;
> det->vsync = vlines - vsync;
>
> }
>
>
>> + 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
>>
--
Best Regards
Jammy
^ permalink raw reply [flat|nested] 12+ messages in thread
* [PATCH 4/4] media: aspeed: Fix timing polarity incorrect
2021-12-17 9:53 [PATCH 0/4] Correct timing report Jammy Huang
` (2 preceding siblings ...)
2021-12-17 9:54 ` [PATCH 3/4] media: aspeed: Correct values for detected timing Jammy Huang
@ 2021-12-17 9:54 ` Jammy Huang
2021-12-22 1:22 ` Joel Stanley
3 siblings, 1 reply; 12+ messages in thread
From: Jammy Huang @ 2021-12-17 9:54 UTC (permalink / raw)
To: eajames, mchehab, joel, andrew, linux-media, openbmc,
linux-arm-kernel, linux-aspeed, linux-kernel
This is a workaround for 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>
---
drivers/media/platform/aspeed-video.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
index 5ad3a20c5bac..f628f69bb7dd 100644
--- a/drivers/media/platform/aspeed-video.c
+++ b/drivers/media/platform/aspeed-video.c
@@ -989,6 +989,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
video->frame_top = FIELD_GET(VE_SRC_TB_EDGE_DET_TOP,
src_tb_edge);
det->vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
+ /*
+ * Workaround for polarity detection
+ * Use sync(VR098) counts from sync's rising edge till falling
+ * edge to tell sync polarity.
+ */
+ if (det->vsync > (FIELD_GET(VE_MODE_DETECT_V_LINES, mds) >> 1))
+ 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 - det->vsync;
det->vfrontporch =
@@ -1010,6 +1019,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
video->frame_left = FIELD_GET(VE_SRC_LR_EDGE_DET_LEFT,
src_lr_edge);
det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
+ /*
+ * Workaround for polarity detection
+ * Use sync(VR098) counts from sync's rising edge till falling
+ * edge to tell sync polarity.
+ */
+ if (det->hsync > (htotal >> 1))
+ 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 - det->hsync;
det->hfrontporch = htotal - video->frame_right;
--
2.25.1
^ permalink raw reply related [flat|nested] 12+ messages in thread* Re: [PATCH 4/4] media: aspeed: Fix timing polarity incorrect
2021-12-17 9:54 ` [PATCH 4/4] media: aspeed: Fix timing polarity incorrect Jammy Huang
@ 2021-12-22 1:22 ` Joel Stanley
2021-12-22 6:10 ` Jammy Huang
0 siblings, 1 reply; 12+ messages in thread
From: Joel Stanley @ 2021-12-22 1:22 UTC (permalink / raw)
To: Jammy Huang
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery, linux-media,
OpenBMC Maillist, Linux ARM, linux-aspeed,
Linux Kernel Mailing List
On Fri, 17 Dec 2021 at 09:54, Jammy Huang <jammy_huang@aspeedtech.com> wrote:
>
> This is a workaround for 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>
> ---
> drivers/media/platform/aspeed-video.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
> index 5ad3a20c5bac..f628f69bb7dd 100644
> --- a/drivers/media/platform/aspeed-video.c
> +++ b/drivers/media/platform/aspeed-video.c
> @@ -989,6 +989,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> video->frame_top = FIELD_GET(VE_SRC_TB_EDGE_DET_TOP,
> src_tb_edge);
> det->vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
> + /*
> + * Workaround for polarity detection
> + * Use sync(VR098) counts from sync's rising edge till falling
> + * edge to tell sync polarity.
> + */
> + if (det->vsync > (FIELD_GET(VE_MODE_DETECT_V_LINES, mds) >> 1))
Are you right shifting as this is the value / 2? I think it's clearer
to write / 2 instead of >> 1.
Mention in the comment that this is a workaround for when the sync
value is larger than half.
> + 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 - det->vsync;
> det->vfrontporch =
> @@ -1010,6 +1019,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
> video->frame_left = FIELD_GET(VE_SRC_LR_EDGE_DET_LEFT,
> src_lr_edge);
> det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
> + /*
> + * Workaround for polarity detection
> + * Use sync(VR098) counts from sync's rising edge till falling
> + * edge to tell sync polarity.
> + */
> + if (det->hsync > (htotal >> 1))
> + 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 - det->hsync;
> det->hfrontporch = htotal - video->frame_right;
> --
> 2.25.1
>
^ permalink raw reply [flat|nested] 12+ messages in thread* Re: [PATCH 4/4] media: aspeed: Fix timing polarity incorrect
2021-12-22 1:22 ` Joel Stanley
@ 2021-12-22 6:10 ` Jammy Huang
0 siblings, 0 replies; 12+ messages in thread
From: Jammy Huang @ 2021-12-22 6:10 UTC (permalink / raw)
To: Joel Stanley
Cc: Eddie James, Mauro Carvalho Chehab, Andrew Jeffery,
linux-media@vger.kernel.org, OpenBMC Maillist, Linux ARM,
linux-aspeed, Linux Kernel Mailing List
Hi Joel,
OK, I will update in next patch as you advised.
Thanks for your review.
On 2021/12/22 上午 09:22, Joel Stanley wrote:
> On Fri, 17 Dec 2021 at 09:54, Jammy Huang <jammy_huang@aspeedtech.com> wrote:
>> This is a workaround for 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>
>> ---
>> drivers/media/platform/aspeed-video.c | 18 ++++++++++++++++++
>> 1 file changed, 18 insertions(+)
>>
>> diff --git a/drivers/media/platform/aspeed-video.c b/drivers/media/platform/aspeed-video.c
>> index 5ad3a20c5bac..f628f69bb7dd 100644
>> --- a/drivers/media/platform/aspeed-video.c
>> +++ b/drivers/media/platform/aspeed-video.c
>> @@ -989,6 +989,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
>> video->frame_top = FIELD_GET(VE_SRC_TB_EDGE_DET_TOP,
>> src_tb_edge);
>> det->vsync = FIELD_GET(VE_SYNC_STATUS_VSYNC, sync);
>> + /*
>> + * Workaround for polarity detection
>> + * Use sync(VR098) counts from sync's rising edge till falling
>> + * edge to tell sync polarity.
>> + */
>> + if (det->vsync > (FIELD_GET(VE_MODE_DETECT_V_LINES, mds) >> 1))
> Are you right shifting as this is the value / 2? I think it's clearer
> to write / 2 instead of >> 1.
>
> Mention in the comment that this is a workaround for when the sync
> value is larger than half.
>
>> + 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 - det->vsync;
>> det->vfrontporch =
>> @@ -1010,6 +1019,15 @@ static void aspeed_video_get_resolution(struct aspeed_video *video)
>> video->frame_left = FIELD_GET(VE_SRC_LR_EDGE_DET_LEFT,
>> src_lr_edge);
>> det->hsync = FIELD_GET(VE_SYNC_STATUS_HSYNC, sync);
>> + /*
>> + * Workaround for polarity detection
>> + * Use sync(VR098) counts from sync's rising edge till falling
>> + * edge to tell sync polarity.
>> + */
>> + if (det->hsync > (htotal >> 1))
>> + 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 - det->hsync;
>> det->hfrontporch = htotal - video->frame_right;
>> --
>> 2.25.1
>>
--
Best Regards
Jammy
^ permalink raw reply [flat|nested] 12+ messages in thread