Laurent Pinchart e5b6b07a1b media: v4l2: Extend VIDIOC_ENUM_FMT to support MC-centric devices ... The VIDIOC_ENUM_FMT ioctl enumerates all formats supported by a video node. For MC-centric devices, its behaviour has always been ill-defined, with drivers implementing one of the following behaviours: - No support for VIDIOC_ENUM_FMT at all - Enumerating all formats supported by the video node, regardless of the configuration of the pipeline - Enumerating formats supported by the video node for the active configuration of the connected subdevice The first behaviour is obviously useless for applications. The second behaviour provides the most information, but doesn't offer a way to find what formats are compatible with a given pipeline configuration. The third behaviour fixes that, but with the drawback that applications can't enumerate all supported formats anymore, and have to modify the active configuration of the pipeline to enumerate formats. The situation is messy as none of the implemented behaviours are ideal, and userspace can't predict what will happen as the behaviour is driver-specific. To fix this, let's extend the VIDIOC_ENUM_FMT with a missing capability: enumerating pixel formats for a given media bus code. The media bus code is passed through the v4l2_fmtdesc structure in a new mbus_code field (repurposed from the reserved fields). With this capability in place, applications can enumerate pixel formats for a given media bus code without modifying the active configuration of the device. The current behaviour of the ioctl is preserved when the new mbus_code field is set to 0, ensuring compatibility with existing userspace. The API extension is documented as mandatory for MC-centric devices (as advertised through the V4L2_CAP_IO_MC capability), allowing applications and compliance tools to easily determine the availability of the VIDIOC_ENUM_FMT extension. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>		2020-05-06 12:09:04 +02:00
..
ABI	media: docs: move uAPI book to userspace-api/media	2020-04-14 10:31:49 +02:00
accounting	doc: cgroup: improve formatting of references	2020-03-02 12:57:03 -07:00
admin-guide	media: admin-guide: split cardlist.rst file	2020-05-05 17:29:22 +02:00
arm	docs: arm: tcm: Fix a few typos	2020-02-19 02:42:21 -07:00
arm64	arm64 updates for 5.7:	2020-03-31 10:05:01 -07:00
block	block: Document genhd capability flags	2020-03-12 07:47:22 -06:00
bpf	bpf: lsm: Add Documentation	2020-03-30 01:35:12 +02:00
cdrom	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
core-api	docs: timekeeping: Use correct prototype for deprecated functions	2020-04-15 14:48:26 -06:00
cpu-freq	docs: cpu-freq: convert cpufreq-stats.txt to ReST	2020-03-06 00:01:02 +01:00
crypto	crypto: algapi - make unregistration functions return void	2019-12-20 14:58:35 +08:00
dev-tools	linux-kselftest-kunit-5.7-rc1	2020-04-01 16:11:40 -07:00
devicetree	media: dt-bindings: media: rockchip-vpu: fix interrupt-names	2020-05-05 17:08:02 +02:00
doc-guide	media: docs: move uAPI book to userspace-api/media	2020-04-14 10:31:49 +02:00
driver-api	media: media/test_drivers: rename to test-drivers	2020-04-16 10:38:31 +02:00
fault-injection	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
fb	media: docs: move uAPI book to userspace-api/media	2020-04-14 10:31:49 +02:00
features	documentation: vm: Advertise support for pte_special in riscv	2020-02-19 02:41:01 -07:00
filesystems	A handful of late-arriving fixes for the documentation tree.	2020-04-10 17:53:43 -07:00
firmware_class
firmware-guide	Documentation: firmware-guide: ACPI: fix table alignment in namespace.rst	2020-04-08 14:27:48 +02:00
fpga	Documentation: fpga: dfl: add descriptions for thermal/power management interfaces	2019-10-16 19:18:26 -07:00
gpu	UAPI Changes:	2020-03-19 10:40:27 +10:00
hid	docs: add some documentation dirs to the driver-api book	2019-07-15 11:03:02 -03:00
hwmon	hwmon: (pmbus/isl68137) Fix up chip IDs	2020-04-12 15:12:51 -07:00
i2c	i2c: convert SMBus alert setup function to return an ERRPTR	2020-03-10 12:19:52 +01:00
ia64	docs: add SPDX tags to new index files	2019-07-15 11:03:03 -03:00
ide	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
iio	docs: add some documentation dirs to the driver-api book	2019-07-15 11:03:02 -03:00
infiniband	Documentation/infiniband: update name of some functions	2019-09-13 16:55:55 -03:00
input	Input: docs: fix spelling mistake "potocol" -> "protocol"	2019-08-06 11:24:49 -06:00
isdn	isdn: capi: dead code removal	2019-12-11 09:12:38 +01:00
kbuild	kbuild: support LLVM=1 to switch the default tools to Clang/LLVM	2020-04-09 03:18:21 +09:00
kernel-hacking	docs: locking: Drop :c:func: throughout	2020-03-20 17:16:24 -06:00
leds	leds: core: Add support for composing LED class device names	2019-07-25 20:07:52 +02:00
livepatch	livepatch: Documentation of the new API for tracking system state changes	2019-11-01 13:08:24 +01:00
locking	Documentation/locking/locktypes: Minor copy editor fixes	2020-03-28 12:47:34 +01:00
m68k	docs: README.buddha: convert to ReST and add to m68k book	2019-07-31 13:30:10 -06:00
maintainer	Add a maintainer entry profile for documentation	2020-01-24 09:48:39 -07:00
mhi	docs: Add documentation for MHI bus	2020-03-19 07:41:04 +01:00
mips	docs: mips: remove no longer needed au1xxx_ide.rst documentation	2020-03-24 15:53:48 +01:00
misc-devices	Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2020-04-01 14:47:40 -07:00
netlabel	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
networking	Documentation: Fix tcp_challenge_ack_limit default value	2020-04-15 16:22:59 -07:00
nios2	docs: nios2: add it to the main Documentation body	2019-07-31 13:31:51 -06:00
nvdimm	docs: nvdimm: use ReST notation for subsection	2020-01-24 09:54:42 -07:00
openrisc	openrisc: configs: Cleanup CONFIG_CROSS_COMPILE	2020-01-31 22:10:58 +09:00
parisc	docs: parisc: convert to ReST and add to documentation body	2019-07-31 13:30:15 -06:00
PCI	pci-v5.7-changes	2020-04-03 14:25:02 -07:00
pcmcia	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
power	Merge branches 'pm-core', 'pm-sleep', 'pm-acpi' and 'pm-domains'	2020-03-30 14:46:58 +02:00
powerpc	powerpc updates for 5.7	2020-04-05 11:12:59 -07:00
process	Documentation/changes: Raise minimum supported binutils version to 2.23	2020-04-09 00:02:00 +09:00
RCU	doc: Add rcutorture scripting to torture.txt	2020-02-27 07:03:14 -08:00
riscv	It has been a relatively quiet cycle for documentation, but there's still a	2020-01-29 15:27:31 -08:00
s390	Documentation/s390: remove outdated debugging390 documentation	2019-08-21 12:41:43 +02:00
scheduler	Documentation/scheduler: fix links in sched-stats	2019-10-29 04:35:41 -06:00
scsi	SCSI misc on 20200402	2020-04-02 17:03:53 -07:00
security	docs: prevent warnings due to autosectionlabel	2020-03-20 17:01:29 -06:00
sh	docs: remove extra conf.py files	2019-07-17 06:57:52 -03:00
sound	ALSA: hda/realtek - Remove now-unnecessary XPS 13 headphone noise fixups	2020-03-31 10:54:06 +02:00
sparc	docs: add arch doc directories to the index	2019-07-15 11:03:01 -03:00
sphinx	docs: Fix empty parallelism argument	2020-02-25 03:11:04 -07:00
sphinx-static	doc-rst: Reduce CSS padding around Field	2019-10-02 10:03:06 -06:00
spi	spi: docs: convert to ReST and add it to the kABI bookset	2019-07-31 14:13:13 -06:00
target	docs: prevent warnings due to autosectionlabel	2020-03-20 17:01:29 -06:00
timers	docs: add some directories to the main documentation index	2019-07-15 11:03:03 -03:00
trace	New tracing features:	2020-04-05 10:36:18 -07:00
translations	media: docs: move user-facing docs to the admin guide	2020-04-14 10:34:58 +02:00
usb	usb: gadget: add raw-gadget interface	2020-03-15 11:34:48 +02:00
userspace-api	media: v4l2: Extend VIDIOC_ENUM_FMT to support MC-centric devices	2020-05-06 12:09:04 +02:00
virt	ARM:	2020-04-02 15:13:15 -07:00
vm	mm/zswap: allow setting default status, compressor and allocator in Kconfig	2020-04-07 10:43:41 -07:00
w1	docs: w1: Fix a typo in omap-hdq.rst	2019-12-30 11:58:02 -07:00
watchdog	linux-watchdog 5.4-rc1 tag	2019-09-27 11:17:38 -07:00
x86	Documentation/x86, efi/x86: Clarify EFI handover protocol and its requirements	2020-04-14 08:32:15 +02:00
xtensa	docs: add arch doc directories to the index	2019-07-15 11:03:01 -03:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
asm-annotations.rst	Documentation: Call out example SYM_FUNC_* usage as x86-specific	2020-01-16 12:53:16 -07:00
atomic_bitops.txt
atomic_t.txt	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-07-08 16:12:03 -07:00
bus-virt-phys-mapping.txt
Changes
CodingStyle
conf.py	docs: conf.py: avoid thousands of duplicate label warning on Sphinx	2020-03-20 17:01:34 -06:00
COPYING-logo	docs: logo.txt: rename it to COPYING-logo	2019-07-15 09:20:27 -03:00
crc32.txt
debugging-via-ohci1394.txt
digsig.txt
DMA-API-HOWTO.txt	docs: DMA-API-HOWTO.txt: fix an unmarked code block	2019-07-15 09:20:24 -03:00
DMA-API.txt	dma-mapping: remove dma_release_declared_memory	2019-09-04 11:13:19 +02:00
DMA-attributes.txt	dma-mapping: remove the DMA_ATTR_WRITE_BARRIER flag	2019-11-14 12:01:54 -04:00
DMA-ISA-LPC.txt
docutils.conf
dontdiff	modpost: dump missing namespaces into a single modules.nsdeps file	2019-11-11 20:10:01 +09:00
futex-requeue-pi.txt
hwspinlock.txt
index.rst	media: docs: get rid of Documentation/media/	2020-04-14 10:36:50 +02:00
IPMI.txt
IRQ-affinity.txt
IRQ-domain.txt
IRQ.txt
irqflags-tracing.txt
Kconfig
kprobes.txt
kref.txt	docs: kref: Clarify the use of two kref_put() in example code	2020-02-25 03:39:10 -07:00
logo.gif
lzo.txt
mailbox.txt
Makefile	media: docs: move uAPI book to userspace-api/media	2020-04-14 10:31:49 +02:00
memory-barriers.txt	Documentation/memory-barriers: Fix typos	2020-02-27 07:03:14 -08:00
nommu-mmap.txt
percpu-rw-semaphore.txt
pi-futex.txt	docs: locking: convert docs to ReST and rename to *.rst	2019-07-15 08:53:27 -03:00
preempt-locking.txt
rbtree.txt	docs: rbtree.txt: fix Sphinx build warnings	2019-07-15 09:20:24 -03:00
remoteproc.txt	remoteproc: Add elf64 support in elf loader	2020-03-25 22:29:40 -07:00
robust-futex-ABI.txt	threads: Update PID limit comment according to futex UAPI change	2020-03-21 17:48:13 +01:00
robust-futexes.txt
rpmsg.txt
speculation.txt
static-keys.txt
SubmittingPatches
tee.txt	Documentation: tee: add AMD-TEE driver details	2020-01-04 13:49:51 +08:00
this_cpu_ops.txt
unaligned-memory-access.txt
xz.txt