media: atomisp: Stop overriding padding w/h to 12 on BYT

atomisp_set_fmt() first does:

	v4l2_fill_mbus_format(&vformat.format, ...);
        vformat.format.height += padding_h;
        vformat.format.width += padding_w;

        ret = v4l2_subdev_call(isp->inputs[asd->input_curr].camera, pad,
                               set_fmt, NULL, &vformat);
        if (ret)
                return ret;

	f->fmt.pix.width = vformat.format.width - padding_w;
	f->fmt.pix.height = vformat.format.height - padding_h;

this happens with the original padding w/h = 16 values and then later
on it calls:

                ret = atomisp_set_fmt_to_snr(vdev, &s_fmt,
                                             f->fmt.pix.pixelformat, padding_w,
                                             padding_h, dvs_env_w, dvs_env_h);

Which repeats the above structure. If at that point padding w/h are
changed to 12 then it will now request a different output-size of
the sensor driver.

The sensor drivers so far have actually been ignoring this since they use
v4l2_find_nearest_size() on a fixed resolution list and the nearest
resolution will be the one from the earlier calls where padding w/h
was 16.

But there really is no reason for sensor drivers to use a fixed
resolution list. They make lower resolutions using cropping so they
can make any resolution as long as width/height are even numbers.

Dropping the fixed-resolution list limit from sensors on BYT results
in trying to start streaming failing because the resolution set to
the sensor now no longer matches with the resolution used during
the initial part of the configuration done by atomisp_set_fmt().

Drop the BYT specific overriding of the padding_w/h to 12, so that
the padding in the first and second s_fmt calls made to the sensor
matches, to fix stream start failing when the fixed resolution list
is dropped.

Reviewed-by: Andy Shevchenko <andy@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -5163,9 +5163,6 @@ int atomisp_set_fmt(struct video_device *vdev, struct v4l2_format *f)
 	if (!atomisp_subdev_format_conversion(asd, source_pad)) {
 		padding_w = 0;
 		padding_h = 0;
-	} else if (IS_BYT) {
-		padding_w = 12;
-		padding_h = 12;
 	}
 
 	/* construct resolution supported by isp */