[PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[Sekhar Nori]

For both BT.656 and BT.1120 video, the pixel format
used by VPIF is Y/CbCr 4:2:2 in semi-planar format
(Luma in one plane and Chroma in another). This
corresponds to NV16 pixel format.

This is documented in section 36.2.3 of OMAP-L138
Technical Reference Manual, SPRUH77A.

The VPIF driver incorrectly sets the default format
to V4L2_PIX_FMT_YUV422P. Fix it.

Reported-by: Alejandro Hernandez <ajhernandez@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 drivers/media/platform/davinci/vpif_capture.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/media/platform/davinci/vpif_capture.c b/drivers/media/platform/davinci/vpif_capture.c
index 44f702752d3a..128e92d1dd5a 100644
--- a/drivers/media/platform/davinci/vpif_capture.c
+++ b/drivers/media/platform/davinci/vpif_capture.c
@@ -513,7 +513,7 @@ static int vpif_update_std_info(struct channel_obj *ch)
 	if (ch->vpifparams.iface.if_type == VPIF_IF_RAW_BAYER)
 		common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_SBGGR8;
 	else
-		common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV422P;
+		common->fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_NV16;
 
 	common->fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
 
@@ -917,8 +917,8 @@ static int vpif_enum_fmt_vid_cap(struct file *file, void  *priv,
 		fmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
 	} else {
 		fmt->type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-		strcpy(fmt->description, "YCbCr4:2:2 YC Planar");
-		fmt->pixelformat = V4L2_PIX_FMT_YUV422P;
+		strcpy(fmt->description, "YCbCr4:2:2 Semi-Planar");
+		fmt->pixelformat = V4L2_PIX_FMT_NV16;
 	}
 	return 0;
 }
@@ -946,8 +946,8 @@ static int vpif_try_fmt_vid_cap(struct file *file, void *priv,
 		if (pixfmt->pixelformat != V4L2_PIX_FMT_SBGGR8)
 			pixfmt->pixelformat = V4L2_PIX_FMT_SBGGR8;
 	} else {
-		if (pixfmt->pixelformat != V4L2_PIX_FMT_YUV422P)
-			pixfmt->pixelformat = V4L2_PIX_FMT_YUV422P;
+		if (pixfmt->pixelformat != V4L2_PIX_FMT_NV16)
+			pixfmt->pixelformat = V4L2_PIX_FMT_NV16;
 	}
 
 	common->fmt.fmt.pix.pixelformat = pixfmt->pixelformat;
-- 
2.9.0

Re: [PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[Kevin Hilman]

Sekhar Nori <nsekhar@ti.com> writes:

> For both BT.656 and BT.1120 video, the pixel format
> used by VPIF is Y/CbCr 4:2:2 in semi-planar format
> (Luma in one plane and Chroma in another). This
> corresponds to NV16 pixel format.
>
> This is documented in section 36.2.3 of OMAP-L138
> Technical Reference Manual, SPRUH77A.
>
> The VPIF driver incorrectly sets the default format
> to V4L2_PIX_FMT_YUV422P. Fix it.
>
> Reported-by: Alejandro Hernandez <ajhernandez@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>

Acked-by: Kevin Hilman <khilman@baylibre.com>

Re: [PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[Lad, Prabhakar]

Hi Sekhar,

Thanks for the patch.

On Fri, May 26, 2017 at 11:55 AM, Sekhar Nori <nsekhar@ti.com> wrote:
> For both BT.656 and BT.1120 video, the pixel format
> used by VPIF is Y/CbCr 4:2:2 in semi-planar format
> (Luma in one plane and Chroma in another). This
> corresponds to NV16 pixel format.
>
> This is documented in section 36.2.3 of OMAP-L138
> Technical Reference Manual, SPRUH77A.
>
> The VPIF driver incorrectly sets the default format
> to V4L2_PIX_FMT_YUV422P. Fix it.
>
> Reported-by: Alejandro Hernandez <ajhernandez@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>

Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Can you also post a similar patch for vpif_display as well ?

Cheers,
--Prabhakar Lad

Re: [PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[Sekhar Nori]

On Tuesday 30 May 2017 03:10 PM, Lad, Prabhakar wrote:
> Hi Sekhar,
> 
> Thanks for the patch.
> 
> On Fri, May 26, 2017 at 11:55 AM, Sekhar Nori <nsekhar@ti.com> wrote:
>> For both BT.656 and BT.1120 video, the pixel format
>> used by VPIF is Y/CbCr 4:2:2 in semi-planar format
>> (Luma in one plane and Chroma in another). This
>> corresponds to NV16 pixel format.
>>
>> This is documented in section 36.2.3 of OMAP-L138
>> Technical Reference Manual, SPRUH77A.
>>
>> The VPIF driver incorrectly sets the default format
>> to V4L2_PIX_FMT_YUV422P. Fix it.
>>
>> Reported-by: Alejandro Hernandez <ajhernandez@ti.com>
>> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
> 
> Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>

Thanks!

> 
> Can you also post a similar patch for vpif_display as well ?

Sure. The LCDK board I am working on does not have the VPIF display. But
I should be able to test that on the EVM.

Thanks,
Sekhar

Re: [PATCH] davinci: vpif_capture: fix default pixel format for BT.656/BT.1120 video

[Benoit Parrot]

Sekhar Nori <nsekhar@ti.com> wrote on Fri [2017-May-26 16:25:27 +0530]:
> For both BT.656 and BT.1120 video, the pixel format
> used by VPIF is Y/CbCr 4:2:2 in semi-planar format
> (Luma in one plane and Chroma in another). This
> corresponds to NV16 pixel format.
> 
> This is documented in section 36.2.3 of OMAP-L138
> Technical Reference Manual, SPRUH77A.
> 
> The VPIF driver incorrectly sets the default format
> to V4L2_PIX_FMT_YUV422P. Fix it.
> 
> Reported-by: Alejandro Hernandez <ajhernandez@ti.com>
> Signed-off-by: Sekhar Nori <nsekhar@ti.com>
> ---
>  drivers/media/platform/davinci/vpif_capture.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 

Acked-by: Benoit Parrot <bparrot@ti.com>