media: staging: media: tegra-video: Use swap macro

Makes the code simpler and cocci happier:

drivers/staging/media/tegra-video/tegra20.c:324:44-45: WARNING opportunity for swap()

Link: https://lore.kernel.org/linux-media/20240429-fix-cocci-v3-10-3c4865f5a4b0@chromium.org
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

staging: media: tegra-video: Fix -Wmaybe-unitialized warn in gcc

Make sure that tegra20_vi_get_input_formats always assign a value for
yuv_input_format.

Fix:
drivers/staging/media/tegra-video/tegra20.c:624:72: warning: ‘yuv_input_format’ may be used uninitialized [-Wmaybe-uninitialized]

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

staging: media: tegra-video: add support for Tegra20 parallel input

The VI peripheral of Tegra supports capturing from MIPI CSI-2 or parallel
video (called VIP in the docs).

The staging tegra-video driver currently implements MIPI CSI-2 video
capture for Tegra210. Add support for parallel video capture (VIP) on
Tegra20. With the generalizations added to the VI driver in previous
commits, this is only a matter of adding the vip.c and tegra20.c
implementations and registering them.

Unfortunately there was no documentation available for the VI or VIP
peripherals of Tegra20 (or any other Tegra chips). This implementation has
been based entirely on the code from a vendor kernel based on Linux 3.1 and
massively adapted to fit into the tegra-video driver. Parts of this code is
definitely non-optimal to say the least (especially tegra20_vi_enable() and
the single-frame capture logic), but it was impossible to improve it.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[hverkuil: fix host1x_client_unregister usage: it's now a void func]