IMX6Q Interlaced TVIN bt656

matthewreynolds — Thu, 24 Apr 2014 03:56:01 GMT

Greetings,

I am working with a custom board based on the IMX6Q SaberSD. Our board uses the 8-bit bt656 parallel input (without external HS/VS) and 8-bit bt656 output with interlaced NTSC video. I got the output working from the patch (Patch to Support BT656 and BT1120 Output For i.MX6 BSP) but, am struggling with the parallel input. I used the adv7180 driver as a reference and made a few modification to configure parallel mode and interlaced. In the function ioctl_g_ifparm I set the "p->u.bt656.bt_sync_correct = 0;" to use internal syncs and set "p->u.bt656.clock_curr = 0;" so mxc_v4l2_capture.c will use IPU_CSI_CLK_MODE_CCIR656_INTERLACED.

Testing the video capture and preview with " /unit_tests/mxc_v4l2_tvin.out -ow 720 -oh 480 -ot 1 -ol 1 -f UYVY" there are a few issues with the video.

- It is continuously rolling vertically

- Colours are incorrect. It looks like it is drawing in the wrong color space?

//My output device tree entry

bt656@0 {

compatible = "fsl,bt656";

ipu_id = <0>;

disp_id = <0>;

default_ifmt = "BT656";

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ipu1_1>;

status = "okay";

};

//My input device tree entry

bt656In {

compatible = "fsl,bt656in";

pinctrl-names = "default";

pinctrl-0 = <&pinctrl_ipu1_2>;

clocks = <&clks 201>;

clock-names = "csi_mclk";

csi_id = <0>;

mclk = <27000000>;

mclk_source = <0>;

};

Is there a problem with this configuration? The only warning message printed is "imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_5 = 0x00000001". Below is the log of the mxc_v4l2_tvin.out test.

Sincerely,

Matthew

/unit_tests/mxc_v4l2_tvin.out -ow 720 -oh 480 -ot 0 -ol 1 -f UYVY
TV decoder chip is bt656_tvinIn mxc_v4l2_s_std b000

In mxc_v4l2_s_std b000
driver=mxc_vout, card=DISP3 FG, bus=, version=0x00030a11, capabilities=0x04000002
fmt RGB565: fourcc = 0x50424752
fmt BGR24: fourcc = 0x33524742
fmt RGB24: fourcc = 0x33424752
fmt RGB32: fourcc = 0x34424752
fmt BGR32: fourcc = 0x34524742
fmt NV12: fourcc = 0x3231564e
fmt UYVY: fourcc = 0x59565955
fmt YUYV: fourcc = 0x56595559
fmt YUV422 planar: fourcc = 0x50323234
fmt YUV444: fourcc = 0x34343459
fmt YUV420: fourcc = 0x32315559
fmt YVU420: fourcc = 0x32315659
fmt TILED NV12P: fourcc = 0x50564e54
fmt TILED NV12F: fourcc = 0x46564e54
fmt YUV444 planar: fourcc = 0x50343434
start time = 1398310913 s, 967905 us
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_5 = 0x00000001
imx-ipuv3 2400000.ipu: IPU Warning - IPU_INT_STAT_5 = 0x00000001

Edit

On further investigation I don't believe the foreground buffer, fb1 is initialized correctly.

# cat /sys/class/graphics/fb1/name

DISP3 FG

# cat /sys/class/graphics/fb1/mode

<empty.>

# cat /sys/class/graphics/fb1/modes

U:712x480p-13
U:240x320p-60

In the device tree I had set disp_dev = "off"; to mxcfb2, mxcfb3 and mxcfb3. I am going to try to re-enable the hdmi device on mxcfb2. Hopefully, that will initialize the buffer and correct the video preview.

Edit 2:

A colour space conversion from the UYVY foreground layer to the bt656 RGB565 output seems to be the problem. I got the foreground layer to display with correct colours by changing the fbpix format from RGB565 to UYVY16 using u-boot variables. However, as a consequence the background layer does not draw correct, since it needs to be RGB565.

In u-boot I changed the video variable from

video=mxcfb0:dev=bt656,BT656-NTSC,if=BT656,fbpix=RGB565

video=mxcfb0:dev=bt656,BT656-NTSC,if=BT656,fbpix=UYVY16

I am still not sure how to configure the system so the background and overlay display correct.

Re: IMX6Q Interlaced TVIN bt656

matthewreynolds — Sat, 26 Apr 2014 01:23:52 GMT

I was able to fix the vertical video scrolling by changing active _top = 13 to active_top = 3 in the mxc_v4l2_capture.c driver. This was mentioned as a work around in a few other discussion.

I still could use some help with configuring the foreground and background displays. Both layers will be used in our application.

Re: IMX6Q Interlaced TVIN bt656

matthewreynolds — Mon, 28 Apr 2014 22:06:20 GMT

Instead of focusing on the drivers and the mxc_v4l2_tvin.out test utility, I was to solve the color problem by configuring the framebuffer for RGB565 and using the gstreamer plugin mfw_ipucsc in our application to perform the color space conversion.

Here is a test pipeline

gst-launch tvsrc ! 'video/x-raw-yuv,width=720,height=480,framerate=30/1' ! mfw_ipucsc ! 'video/x-raw-rgb,bpp=16,width=720,height=480,framerate=30/1' ! mfw_v4lsink disp-width=720 disp-height=480 device=/dev/video17

Re: IMX6Q Interlaced TVIN bt656

YixingKong — Fri, 20 Jun 2014 03:40:55 GMT

Mattew

Had your issue got resolved? If yes, we are going to close the discussion in 3 days. If you still need help, please feel free to reply with an update to this discussion.

Thanks,

Yixing

Re: IMX6Q Interlaced TVIN bt656

matthewreynolds — Fri, 20 Jun 2014 05:48:01 GMT

Yixing,

Yes, I was able to work it out.

Thank You,

Matthew

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