There's no reason why this driver should use BUG(). Instead,
just properly handle issue, returning an error code where
pertinent.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

When in passthrough mode, copy the entire line at once, in
order to make it faster (if not HFLIP).
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Add an horizontal linear scaler using Breseham algorithm in
order to speep up its calculus.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Handling any Y,Cr,Cb formats require some extra logic, as it
handles a group of two pixels. That's easy while we don't do
horizontal scaling.

However, doing horizontal scaling with such formats would require
a lot more code, in order to avoid distortions, as, if it scales
to two non-consecutive points, the logic would need to read 4
points in order to properly convert to RGB.

As this is just a test driver, and we want fast algorithms,
let's just get rid of this format as an output one.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

When resolutions are different, the expected behavior is to
scale the image. Implement a vertical scaler as the first step.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

The vim2m driver doesn't enforce that the capture and output
buffers would have the same size. Do the right thing if the
buffers are different, zeroing the buffer before writing,
ensuring that lines will be aligned and it won't write past
the buffer area.

This is a temporary fix.

A proper fix is to either implement a simple scaler at vim2m,
or to better define the behaviour of M2M transform drivers
at V4L2 API with regards to its capability of scaling the
image or not.

In any case, such changes would deserve a separate patch
anyway, as it would imply on some behavoral change.

Also, as we have an actual bug of writing data at wrong
places, let's fix this here, and add a mental note that
we need to properly address it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

The only real restriction at vim2m is that width should be
multiple of two, as the copy routine always copy two pixels
each time.

However, Bayer formats are defined as having a 2x2 matrix.
So, odd vertical numbers would cause color distortions at the
last line. So, it makes sense to use step 2 for vertical alignment
on Bayer.

With this patch, the reported formats for video capture will
be:

	[0]: 'RGBP' (16-bit RGB 5-6-5)
		Size: Stepwise 32x32 - 640x480 with step 2/1
	[1]: 'RGBR' (16-bit RGB 5-6-5 BE)
		Size: Stepwise 32x32 - 640x480 with step 2/1
	[2]: 'RGB3' (24-bit RGB 8-8-8)
		Size: Stepwise 32x32 - 640x480 with step 2/1
	[3]: 'BGR3' (24-bit BGR 8-8-8)
		Size: Stepwise 32x32 - 640x480 with step 2/1
	[4]: 'YUYV' (YUYV 4:2:2)
		Size: Stepwise 32x32 - 640x480 with step 2/1
	[5]: 'BA81' (8-bit Bayer BGBG/GRGR)
		Size: Stepwise 32x32 - 640x480 with step 2/2
	[6]: 'GBRG' (8-bit Bayer GBGB/RGRG)
		Size: Stepwise 32x32 - 640x480 with step 2/2
	[7]: 'GRBG' (8-bit Bayer GRGR/BGBG)
		Size: Stepwise 32x32 - 640x480 with step 2/2
	[8]: 'RGGB' (8-bit Bayer RGRG/GBGB)
		Size: Stepwise 32x32 - 640x480 with step 2/2
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

As we do alignments for width, expose it via V4L2 API.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

The copy logic assumes that the data width is multiple of two,
as this is needed in order to support YUYV.

There's no reason to force it to be 8-pixel aligned, as 2-pixel
alignment is enough.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

1) Use two levels for debug:
	- level 1: setup stuff
	- level 2: add queue/dequeue messages

2) Better display the debug output, translating buffer
   type, fourcc and making some messages clearer.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

The vim2m device is interesting to simulate a webcam. As most
sensors are arranged using bayer formats, the best is to support
to output data using those formats.

So, add support for them.

All 4 8-bit bayer formats tested with:

	$ qvidcap -p &
	$ v4l2-ctl --stream-mmap --stream-out-mmap --stream-to-host localhost --stream-lossless --stream-out-hor-speed 1 -v pixelformat=RGGB

It was tested also with GStreamer with:

	$ gst-validate-1.0 filesrc location=some_video.mp4 ! qtdemux ! avdec_h264 ! videoconvert ! videoscale ! v4l2convert disable-passthrough=1 extra-controls="s,horizontal_flip=0,vertical_flip=0" ! bayer2rgb ! videoconvert ! xvimagesink

For all possible HFLIP/VFLIP values.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Those typos were left over from codespell check, on
my first pass or belong to code added after the time I
ran it.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Reviewed-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Andrzej Pietrasiewicz <andrzejtp2010@gmail.com>
Reviewed-by: Benoit Parrot <bparrot@ti.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Lad, Prabhakar <prabhakar.csengg@gmail.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Reviewed-by: Houlong Wei <houlong.wei@mediatek.com>
Reviewed-by: Yong Deng <yong.deng@magewell.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Use codespell to fix lots of typos over frontends.

Manually verified to avoid false-positives.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Remove code that is not called anywhere, just
remove the internal ops.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

When an rc device is created, we do not know what key codes it will
support, since a new keymap might be loaded at some later point. So,
we set all keybit in the input device.

The uevent for the input device includes all the key codes, of which
there are now 768. This overflows the size of the uevent
(UEVENT_BUFFER_SIZE) and no event is generated.

Revert for now until we figure out a different solution.

This reverts commit fec225a0.

Cc: <stable@vger.kernel.org> # 4.20+
Reported-by: Christian Holpert <christian@holpert.de>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Some kernel-doc markups are wrong. fix them.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

There are lots of warnings produced by this driver. It is not
as much as atomisp, but it is still a lot.

So, use the same solution to hide most of them.
Those need to be fixed before promoting it out of staging,
so add it at the TODO list.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

	drivers/staging/media/imx/imx7-media-csi.c: In function 'imx7_csi_enum_mbus_code':
	drivers/staging/media/imx/imx7-media-csi.c:926:33: warning: variable 'in_cc' set but not used [-Wunused-but-set-variable]
	  const struct imx_media_pixfmt *in_cc;
	                                 ^~~~~
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

if imx7_csi_try_fmt() fails, outcc variable won't be
initialized and csi->cc[IMX7_CSI_PAD_SRC] would be pointing
to a random location.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Commit 5964cbd8 ("imx: Set capture compose rectangle in
capture_device_set_format") broke the compilation of commit
05f63404 ("staging/imx7: add imx7 CSI subdev driver").

These patches came in through different pull requests and
nobody noticed that the first changed functions that the
second relied upon.

Update imx7-media-csi.c accordingly.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Add maintainer entry for the imx7 media csi, mipi csis driver,
dt-bindings and documentation.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Add non vendor bayer formats to the allowed format array.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Add some i.MX7 related entries to TODO file.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Sphinx didn't like the code-blocks on this file:

	Documentation/media/v4l-drivers/imx7.rst:19: WARNING: Inline substitution_reference start-string without end-string.
	Documentation/media/v4l-drivers/imx7.rst:20: WARNING: Block quote ends without a blank line; unexpected unindent.
	Documentation/media/v4l-drivers/imx7.rst:27: WARNING: Inline substitution_reference start-string without end-string.
	Documentation/media/v4l-drivers/imx7.rst:79: WARNING: Error in "code-block" directive:
	maximum 1 argument(s) allowed, 26 supplied.

	.. code-block:: none
	   # Setup links
	<snip/>
	   media-ctl -V "'csi':0 [fmt:SBGGR10_1X10/800x600 field:none]"
	Documentation/media/v4l-drivers/imx7.rst:96: WARNING: Error in "code-block" directive:
	maximum 1 argument(s) allowed, 9 supplied.

	.. code-block:: none
	<snip/>.
	                    -> "imx7-mipi-csis.0":0 [ENABLED]

Fix them, in order to match the expected syntax for code blocks.
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Add rst document to describe the i.MX7 media driver and also a working
example from the Warp7 board usage with a OV2680 sensor.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

Adds MIPI CSI-2 subdev for i.MX7 to connect with sensors with a MIPI
CSI-2 interface.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: clean up some alignment warnings]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

This add the media entity subdevice and control driver for the i.MX7
CMOS Sensor Interface.
Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil-cisco@xs4all.nl: clean up some alignment warnings]
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>