Commit Graph

722018 Commits

Author SHA1 Message Date
Jia-Ju Bai
df8ab4c601 media: bdisp: Fix a possible sleep-in-atomic bug in bdisp_hw_save_request
The driver may sleep under a spinlock.
The function call path is:
bdisp_device_run (acquire the spinlock)
  bdisp_hw_update
    bdisp_hw_save_request
      devm_kzalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: Fabien Dessenne <fabien.dessenne@st.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 15:02:48 -05:00
Stanimir Varbanov
c0cb76589c media: vb2: unify calling of set_page_dirty_lock
Currently videobuf2-dma-sg checks for dma direction for
every single page and videobuf2-dc lacks any dma direction
checks and calls set_page_dirty_lock unconditionally.

Thus unify and align the invocations of set_page_dirty_lock
for videobuf2-dc, videobuf2-sg  memory allocators with
videobuf2-vmalloc, i.e. the pattern used in vmalloc has been
copied to dc and dma-sg.

Suggested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 15:02:08 -05:00
Hans Verkuil
c4b72ee8ac media: pvrusb2: correctly return V4L2_PIX_FMT_MPEG in enum_fmt
The pvrusb2 code appears to have a some old workaround code for xawtv that causes a
WARN() due to an unrecognized pixelformat 0 in v4l2_ioctl.c.

Since all other MPEG drivers fill this in correctly, it is a safe assumption that
this particular problem no longer exists.

While I'm at it, clean up the code a bit.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 15:01:23 -05:00
Philipp Zabel
327553ae8e media: vb2: clear V4L2_BUF_FLAG_LAST when filling vb2_buffer
V4L2_BUF_FLAG_LAST is a signal from the driver to userspace for buffers
on the capture queue. When userspace queues back a capture buffer with
the flag set, we should clear it.

Otherwise, if userspace restarts streaming after EOS, without
reallocating the buffers, mem2mem devices will erroneously signal EOS
prematurely, as soon as the already flagged buffer is dequeued.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 15:00:33 -05:00
Philipp Zabel
645838b519 media: coda: use correct offset for mpeg4 decoder mvcol buffer
The mvcol buffer needs to be placed behind the chroma plane(s) when
decoding MPEG-4, same as for the h.264 decoder. Use the real offset
with the required rounding.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 15:00:16 -05:00
Philipp Zabel
25141bc7ac media: coda: allocate space for mpeg4 decoder mvcol buffer
The MPEG-4 decoder mvcol buffer was registered, but its size not added
to a frame buffer allocation. This could cause the decoder to write past
the end of the allocated buffer for large frame sizes.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:59:52 -05:00
Philipp Zabel
8e75a5363c media: coda: round up frame sizes to multiples of 16 for MPEG-4 decoder
We need internal frames to be rounded up to full macroblocks for MPEG-4
decoding as well.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:59:31 -05:00
Philipp Zabel
1403bc4c0f media: coda: fix capture TRY_FMT for YUYV with non-MB-aligned widths
Since bytesperline always fulfills VDOA width requirements, detile the
whole buffer instead of limiting to visible width. This stops TRY_FMT
from returning -EINVAL for YUYV capture buffers that are not a multiple
of 16 wide.

An alternative would be to always round up width to stride, as we report
the valid image rectange via G_SELECTION (V4L2_SEL_TGT_COMPOSE_DEFAULT),
but that would require all applications to handle the compose default
rectangle properly.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:59:04 -05:00
Lucas Stach
e112146f3b media: coda: set min_buffers_needed
The current driver implementation expects at least one buffer on
all queues to start streaming. Properly signal this to the vb2
core, to avoid confusion when streamon is racing with qbuf.

Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:58:39 -05:00
Flavio Ceolin
9392483122 media: pxa_camera: disable and unprepare the clock source on error
pxa_camera_probe() was not calling pxa_camera_deactivate(),
responsible to call clk_disable_unprepare(), on the failure path. This
was leading to unbalancing source clock.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:57:45 -05:00
Jacopo Mondi
866a6eccdd media: v4l: sh_mobile_ceu: Return buffers on streamoff()
videobuf2 core reports an error when not all buffers have been returned
to the framework:

drivers/media/v4l2-core/videobuf2-core.c:1651
WARN_ON(atomic_read(&q->owned_by_drv_count))

Fix this returning all buffers currently in capture queue.

Signed-off-by: Jacopo Mondi <jacopo+renesas@jmondi.org>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:57:25 -05:00
Mauro Carvalho Chehab
991232a929 media: vb2-core: fix descriptions for VB2-only functions
When we split VB2 into an independent streaming module and
a V4L2 one, some vb2-core functions started to have a wrong
description: they're meant to be used only by the API-specific
parts of VB2, like vb2-v4l2, as the functions that V4L2 drivers
should use are all under videobuf2-v4l2.h.

Correct their descriptions.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:37:02 -05:00
Mauro Carvalho Chehab
bb92895a1c media: v4l2-subdev: convert frame description to enum
As kernel-doc doesn't support documenting #define values,
and using enum makes easier to identify where the values
are used, convert V4L2_MBUS_FRAME_DESC_FL_* to enum, and
use BIT() macro.

While here, fix the description at v4l2_mbus_frame_desc_entry,
in order to match what's described for
V4L2_MBUS_FRAME_DESC_FL_LEN_MAX.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:15:48 -05:00
Mauro Carvalho Chehab
4eb2f55728 media: v4l2-subdev: better document IO pin configuration flags
Convert V4L2_SUBDEV_IO_PIN_* to enums, use BIT() and document
via kernel-doc.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 14:14:29 -05:00
Mauro Carvalho Chehab
0722ef82e5 media: v4l2-subdev: fix a typo
ownner -> owner

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:38:24 -05:00
Mauro Carvalho Chehab
43feabdbcc media: v4l2-tpg: use __u16 instead of int for struct tpg_rbg_color16
Despite the struct says "color16", it was actually using 32 bits
for each color. Fix it.

Suggested-by: Hans Verkuil <hverkuil@xs4all.nl>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:29:40 -05:00
Mauro Carvalho Chehab
b29fd5639c media: v4l2-tpg.h: rename color structs
The color structs right now are just "color" and "color16".
That may lead into conflicts, and don't define precisely what
they meant. As those are used by two drivers (vivid and vimc),
this is even on a somewhat public header!

So rename them to:
	color ->  tpg_rbg_color8
	color16 ->  tpg_rbg_color16

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:29:05 -05:00
Mauro Carvalho Chehab
1beb623bda media: v4l2-tpg*.h: move headers to include/media/tpg and merge them
The v4l2-tpg*.h headers are meant to be used only internally by
vivid and vimc. There's no sense keeping them together with the
V4L2 kAPI headers. Also, one header includes the other as they're
meant to be used together. So, merge them.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:28:35 -05:00
Mauro Carvalho Chehab
9fbe71b4d8 media: vb2: add cross references at memops and v4l2 kernel-doc markups
Add cross-references where needed and add periods at the end of
each kernel-doc paragraph, in order to make it coherent with other
VB2 descriptions.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:27:41 -05:00
Mauro Carvalho Chehab
8dcde47ff8 media: vb2-core: document remaining functions
There are several VB2 core functions that aren't documented.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:21:45 -05:00
Mauro Carvalho Chehab
2b14132455 media: vb2-core: Improve kernel-doc markups
There are several issues on the current markups:
- lack of cross-references;
- wrong cross-references;
- lack of a period of the end of several phrases;
- Some descriptions can be enhanced.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:20:52 -05:00
Mauro Carvalho Chehab
37bc2d8741 media: vb2-core: use bitops for bits
Use the existing macros to identify vb2_io_modes bits.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 12:17:33 -05:00
Mauro Carvalho Chehab
07bf9355ca media: v4l2-subdev: fix description of tuner.s_radio ops
The description there is completely broken and it mentions
an ioctl that doesn't exist.

Fix it.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:57:15 -05:00
Mauro Carvalho Chehab
3fb558f6c3 media: v4l2-subdev: create cross-references for ioctls
When generating Sphinx output, create cross-references for the
callbacks for each ioctl.

While here, fix a few wrong names for ioctls.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:56:36 -05:00
Mauro Carvalho Chehab
63b31ffd1c media: v4l2-dev: document video_device flags
Convert #defines to enums and add kernel-doc markups for V4L2
video_device flags.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:55:02 -05:00
Mauro Carvalho Chehab
468fde0b79 media: v4l2-dev: document VFL_DIR_* direction defines
The V4L_DIR_* direction flags document the direction for a
V4L2 device node. Convert them to enum and document.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:54:22 -05:00
Mauro Carvalho Chehab
1ac051631a media: get rid of i2c-addr.h
In the past, the same I2C address were used on multiple places.
After I2C rebinding changes, this is no longer needed. So, we
can just get rid of this header, placing the I2C address where
they belong, e. g. either at bttv driver or at tvtuner.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:52:24 -05:00
Mauro Carvalho Chehab
39654531be media: i2c-addr.h: get rid of now unused defines
Some of the previously used I2C addresses there aren't used
anymore. So, get rid of them.

Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:50:17 -05:00
Mauro Carvalho Chehab
4839c58f03 media: v4l2-dev: convert VFL_TYPE_* into an enum
Using enums makes easier to document, as it can use kernel-doc
markups. It also allows cross-referencing, with increases the
kAPI readability.

Please notice that now cx88_querycap() has to have a default for
the VFL type, as there are more types than supported by the driver.

Acked-By: Mike Isely <isely@pobox.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 11:49:40 -05:00
Mauro Carvalho Chehab
2120961f0c media: v4l2-mediabus: use BIT() macro for flags
Instead of using (1 << n) for bits, use the BIT() macro,
as it makes a difference from documentation point of view.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:41:45 -05:00
Mauro Carvalho Chehab
716b87647f media: v4l2-flash-led-class.h: add kernel-doc to two helper funcs
There are two helper functions at v4l2-flash-led-class.h
that aren't documented.

Document them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:40:41 -05:00
Mauro Carvalho Chehab
69b925c5fc media: v4l2-dev.h: add kernel-doc to two macros
There are two macros at v4l2-dev.h that aren't documented.

Document them, for completeness.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:38:39 -05:00
Mauro Carvalho Chehab
66f1e6078e media: v4l2-event.rst: improve events description
Both v4l2-event.rst and v4l2-event.h have an overview of
events, but there are some inconsistencies there:

- at v4l2-event, the event's ring buffer is called kevent. Its
  name is, instead, v4l2_kevent;

- Some things are mentioned on both places (with different words),
  others are either on one of the files.

In order to cleanup this mess, put everything at v4l2-event.rst
and improve it to be a little more coherent and to have cross
references.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:35:46 -05:00
Mauro Carvalho Chehab
bd945e4799 media: media-entity.h: add kernel-doc markups for nested structs
Now that nested structs are parsed by kernel-doc, add markups
to them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:22:40 -05:00
Mauro Carvalho Chehab
60e7926b93 media: videobuf2-core: improve kernel-doc markups
Now that nested structs are supported, change the
documentation to use it. While here, add cross-references
where pertinent and use monotonic fonts where pertinent,
using the right markup tags.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:21:51 -05:00
Mauro Carvalho Chehab
20139f1857 media: v4l2-ctrls: document nested members of structs
There are a few nested members at v4l2-ctrls.h. Now that
kernel-doc supports, document them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:21:16 -05:00
Mauro Carvalho Chehab
d63a9ef241 media: v4l2-fwnode.h: better describe bus union at fwnode endpoint struct
Better document the bus union at struct v4l2_fwnode_endpoint.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:18:15 -05:00
Mauro Carvalho Chehab
f4ab70e3d2 media: rc-core.h: minor adjustments at rc_driver_type doc
The description of this enum doesn't match what it
actually represents. Adjust it.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:16:04 -05:00
Mauro Carvalho Chehab
cccd6fa435 media: rc-core.rst: add an introduction for RC core
The RC core does several assumptions, but those aren't documented
anywhere, with could make harder for ones that want to understand
what's there.

So, add an introduction explaining the basic concepts of RC and
how they're related to the RC core implementation.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:15:29 -05:00
Mauro Carvalho Chehab
4ffbf14369 media: v4l2-dv-timings.h: convert comment into kernel-doc markup
The can_reduce_fps() is already documented, but it is not
using the kernel-doc markup. Convert it, in order to generate
documentation from it.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 10:00:48 -05:00
Mauro Carvalho Chehab
76a59fe770 media: v4l2-common.h: document helper functions
There are several helper functions that aren't documented.

Document them.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:25:26 -05:00
Mauro Carvalho Chehab
0545629e50 media: v4l2-common: get rid of struct v4l2_discrete_probe
This struct is there just two store two arguments of
v4l2_find_nearest_format(). The other two arguments are passed
as parameter.

IMHO, there isn't much sense on doing that, and that will just
add one more struct to document ;)

So, let's get rid of the struct, passing the parameters directly.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:14:57 -05:00
Mauro Carvalho Chehab
01154ef582 media: v4l2-common: get rid of v4l2_routing dead struct
This struct is not used anymore. Get rid of it and update
the documentation about what should still be converted.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:11:25 -05:00
Mauro Carvalho Chehab
8030e774e2 media: tuner-types: add kernel-doc markups for struct tunertype
This struct is lacking documentation. Add it.

Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:06:40 -05:00
Mauro Carvalho Chehab
0bd9298557 media: frontend: describe nested structs
There are some nested structs on this header, with aren't
properly document them.

This should solve some warnings after the addition of
a patche at kernel-doc adding support for nested structs/unions.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:05:59 -05:00
Mauro Carvalho Chehab
8db044b24d media: dvb_demux: describe nested structs
There are some nested structs on this header, with aren't
properly document them.

This should solve some warnings after the addition of
a patche at kernel-doc adding support for nested structs/unions.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:05:04 -05:00
Mauro Carvalho Chehab
3483d3aebd media: dmxdev: describe nested structs
There are some nested structs on this header, with aren't
properly document them.

This should solve some warnings after the addition of
a patche at kernel-doc adding support for nested structs/unions.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-18 09:02:22 -05:00
Steve Longerbeam
45267fed3e media: staging/imx: update TODO
Update TODO file:

- Remove TODO info about the OV564x driver, while this still needs
  to be done (add a OV5642 driver or merge with OV5640 driver), it
  is not relevant here.

- Update TODO about methods for retrieving CSI bus config.

- Add some TODO's about OF graph parsing restrictions.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-15 14:10:26 -05:00
Steve Longerbeam
e762fe4c58 media: staging/imx: reorder function prototypes
Re-order some of the function prototypes in imx-media.h to
group them correctly by source file. No functional changes.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-15 14:09:42 -05:00
Steve Longerbeam
bd9d208a04 media: staging/imx: convert static vdev lists to list_head
Although not technically necessary because imx-media has only a
maximum of 8 video devices, and once setup the video device lists
are static, in anticipation of moving control ineritance to
v4l2-core, make the vdev lists more generic by converting to
dynamic list_head's.

After doing that, 'struct imx_media_pad' is now just a list_head
of video devices reachable from a pad. Allocate an array of list_head's,
one list_head for each pad, and attach that array to sd->host_priv.
An entry in the pad lists is of type 'struct imx_media_pad_vdev', and
points to a video device from the master list.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2017-12-15 14:08:03 -05:00