Hi Laurent,
2014-07-10 0:29 GMT+02:00 Laurent Pinchart <laurent.pinch...@ideasonboard.com>:
> Hi Enric,
>
> On Wednesday 09 July 2014 17:56:59 Enric Balletbo Serra wrote:
>> 2014-05-16 2:45 GMT+02:00 Laurent Pinchart wrote:
>> > Hi Mauro,
>> >
>> > The following changes since commit
>> > ba0d342ecc21fbbe2f6c178f4479944d1fb34f3b:
>> > saa7134-alsa: include vmalloc.h (2014-05-13 23:05:15 -0300)
>> >
>> > are available in the git repository at:
>> > git://linuxtv.org/pinchartl/media.git sensors/next
>> >
>> > for you to fetch changes up to a3a7145c6cecbd9752311b8ae1e431f6755ad5f3:
>> > mt9p031: Fix BLC configuration restore when disabling test pattern
>> >
>> > (2014-05-16 02:43:50 +0200)
>> >
>> > ----------------------------------------------------------------
>> >
>> > Laurent Pinchart (2):
>> > mt9p031: Really disable Black Level Calibration in test pattern mode
>> > mt9p031: Fix BLC configuration restore when disabling test pattern
>> >
>> > drivers/media/i2c/mt9p031.c | 53 ++++++++++++++++++++++++++++++----------
>> >
>> > 1 file changed, 39 insertions(+), 14 deletions(-)
>>
>> I'm trying to test omap3-isp and a board with mt9p031 sensor with
>> current mainline. For now I'm using tag version 3.15 (which is close
>> to current mainline). First, when I tried to use the test patterns I
>> only saw a black screen, but after applying these two patches I saw an
>> improvement, although I can see the test pattern correctly.
>>
>> After some modifications the subdevs_group for my board is as follows:
>>
>> +static struct isp_v4l2_subdevs_group igep00x0_camera_subdevs[] = {
>> + {
>> + .subdevs = cam0020_primary_subdevs,
>> + .interface = ISP_INTERFACE_PARALLEL,
>> + .bus = {
>> + .parallel = {
>> + /* CAM[11:0] */
>> + .data_lane_shift = ISP_LANE_SHIFT_2,
>> + /* Sample on falling edge */
>> + .clk_pol = 1,
>> + }
>> + },
>> + },
>> + { },
>> +};
>>
>> As I have some problems I would ask some questions, maybe you can help me.
>>
>> In the past in the data_lane_shift was ISP_LANE_SHIFT_0, but now, it
>> seems I should to use ISP_LANE_SHIFT_2 (CAM[11:0] - as I saw in the
>> include file). ISP_LANE_SHIFT_0 is for CAM[13:0] but OMAP3 has only 12
>> data bus signals. Is that right ?
>
> Not really. The CCDC input is actually 16 bits wide. The ISP parallel bus is
> limited to 12 bits, the CSI2 receivers output up to 14 bits, and the bridge
> can merge two 8-bit samples into a 16-bit sample for YUV formats.
>
> When using a 12 bit parallel sensor, unless you want to restrict the dynamic
> of the input image, you should use a data lane shift value of 0. This will
> cause the CAMEXT[13:0] signal to be mapped to CAM[13:0]. As the parallel bus
> is limited to 12 bits, the CAM[13:12] bits will be set to zero. When capturing
> from the CCDC output to memory each pixel will be stored on 16 bits, with bits
> [15:12] set to zero, and bits [11:0] containing image data. When forwarding
> data to the preview engine, which has an input width of 10 bits, the ISP
> driver will configure the CCDC video port to output bits [11:2] to the preview
> engine, dropping the two LSBs.
>
Clear now, thank you for the explanations ...
>> Another thing is I'm not able to capture the image correctly, also if
>> if configure to ouput a test pattern, doesn't looks good. See as
>> example [1] and [2]. Do you know what could be the problem ?
>>
>> For your information these are the pipeline that I'm using :
>>
>> media-ctl -v -r -l '"mt9p031 1-005d":0->"OMAP3 ISP CCDC":0[1],
>> "OMAP3 ISP CCDC":2->"OMAP3 ISP preview":0[1], "OMAP3 ISP
>> preview":1->"OMAP3 ISP resizer":0[1], "OMAP3 ISP resizer":1->"OMAP3
>> ISP resizer output":0[1]'
>>
>> media-ctl -v -f '"mt9p031 1-005d":0[SGRBG12 720x480], "OMAP3 ISP
>> CCDC":2[SGRBG8 720x480], "OMAP3 ISP preview":1[UYVY 720x480], "OMAP3
>> ISP resizer":1[UYVY 720x480]'
>
> I would configure the pipeline with SGRBG10 at the output of the CCDC. The
> resolutions you request through the pipeline can't be achieved exactly, as the
> sensor can only perform binning/skipping to downscale. The resizer will take
> care to scale the image to the requested 720x480, but it will get distorted.
> You should use media-ctl -p to see what resolutions the above command actually
> sets, and fix the configuration with appropriate cropping if you want to keep
> the sensor aspect ratio intact.
>
Right. with configuration fixed works as expected. Thanks :)
>> # Set Vertical Color Bars as test pattern
>> yavta -w '0x009f0903 9' /dev/v4l-subdev8
>>
>> # Capture data with
>> yavta -f UYVY -s 720x480 --capture=5 --skip=1 --file=image-# /dev/video6
>>
>> # And convert with
>> raw2rgbpnm -s 720x480 image-00000.uyuv image-00000.pnm
>>
>> Thanks in advance and any help will be appreciate.
>>
>> Regards,
>> Enric
>>
>> [1] http://downloads.isee.biz/pub/files/tmp/9-Vertical Color Bars.pnm
>> [2] http://downloads.isee.biz/pub/files/tmp/9-Vertical Color Bars.uyvy
>
> --
> Regards,
>
> Laurent Pinchart
>
Best regards,
Enric
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