[Bug 785164] v4lsrc: device negociating a color format not exposed by the driver

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785164

--- Comment #6 from Florent Thiéry <florent.thiery at ubicast.eu> ---
The driver offers private controls allowing get the detected input
characteristics (v4l2.RGB133_V4L2_CID_HOR_TIME, v4l2.RGB133_V4L2_CID_VER_TIME).
Other private controls allow to override analog timings, brightness, contrast,
scaling A/R behaviour ...

We currently don't need/use input selection as the driver supports an option to
expose all inputs as separate /dev/videoN device nodes.

Btw the card does internal scaling, so i can just request whatever i want and
it will up/down scale if necessary.

Also, they support quite a lot of colorspaces that are not even supported by
v4l, which triggers massive amounts of such kernel messages :

[15804.161161] WARNING: CPU: 5 PID: 3162 at
drivers/media/v4l2-core/v4l2-ioctl.c:1291 v4l_enum_fmt+0x771/0x1220 [videodev]
[15804.161161] Unknown pixelformat 0x20203842
[15804.161162] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek
snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp
nls_iso8859_1 nls_cp437 snd_hda_intel kvm_intel vfat iTCO_wdt fat rgb200(PO)
rgb133(PO) kvm i915 irqbypass snd_hda_codec mei_wdt iTCO_vendor_support
crct10dif_pclmul drm_kms_helper ppdev crc32_pclmul snd_hda_core crc32c_intel
mxm_wmi ghash_clmulni_intel drm aesni_intel snd_hwdep videodev aes_x86_64
snd_pcm lrw intel_gtt evdev e1000e igb gf128mul media mac_hid snd_timer
syscopyarea glue_helper sysfillrect sysimgblt ablk_helper snd dca fb_sys_fops
cryptd mei_me i2c_algo_bit mei ptp soundcore i2c_i801 intel_cstate psmouse
intel_rapl_perf pps_core shpchp i2c_smbus pcspkr hci_uart btbcm btqca btintel
bluetooth parport_pc parport battery i2c_hid acpi_als
[15804.161177]  intel_lpss_acpi rfkill intel_lpss wmi kfifo_buf fjes hid
tpm_tis tpm_tis_core video industrialio tpm acpi_pad button sch_fq_codel
ip_tables x_tables ext4 crc16 jbd2 fscrypto mbcache sd_mod serio_raw atkbd
libps2 ahci libahci xhci_pci libata xhci_hcd scsi_mod usbcore usb_common i8042
serio
[15804.161184] CPU: 5 PID: 3162 Comm: v4l2src11:src Tainted: P        W  O   
4.9.37-1-lts #1
[15804.161184] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./IMB-391, BIOS P1.00 10/18/2016
[15804.161185]  ffffc9000a0c3bb0 ffffffff812f904d ffffc9000a0c3c00
0000000000000000
[15804.161186]  ffffc9000a0c3bf0 ffffffff8107cc6b 0000050b0a0c3c28
ffffc9000a0c3d88
[15804.161187]  0000000000000000 0000000000000000 ffffffffa0d5acc0
ffffc90009e6d000
[15804.161188] Call Trace:
[15804.161189]  [<ffffffff812f904d>] dump_stack+0x63/0x86
[15804.161190]  [<ffffffff8107cc6b>] __warn+0xcb/0xf0
[15804.161191]  [<ffffffff8107ccef>] warn_slowpath_fmt+0x5f/0x80
[15804.161192]  [<ffffffffa05eb381>] v4l_enum_fmt+0x771/0x1220 [videodev]
[15804.161194]  [<ffffffffa05ec7b4>] __video_do_ioctl+0x364/0x370 [videodev]
[15804.161194]  [<ffffffff810a6d3f>] ? ttwu_do_activate+0x6f/0x80
[15804.161196]  [<ffffffff810a7800>] ? try_to_wake_up+0xd0/0x3b0
[15804.161198]  [<ffffffffa05ec0fb>] video_usercopy+0x2cb/0x600 [videodev]
[15804.161199]  [<ffffffffa05ec450>] ? video_ioctl2+0x20/0x20 [videodev]
[15804.161200]  [<ffffffff811015e5>] ? do_futex+0x695/0xb90
[15804.161201]  [<ffffffff8118cef6>] ?
lru_cache_add_active_or_unevictable+0x36/0xb0
[15804.161202]  [<ffffffffa05ec445>] video_ioctl2+0x15/0x20 [videodev]
[15804.161203]  [<ffffffffa05e774c>] v4l2_ioctl+0xbc/0xe0 [videodev]
[15804.161204]  [<ffffffff8121bec5>] do_vfs_ioctl+0xa5/0x600
[15804.161205]  [<ffffffff8121c499>] SyS_ioctl+0x79/0x90
[15804.161205]  [<ffffffff815fc637>] entry_SYSCALL_64_fastpath+0x1a/0xa9
[15804.161206] ---[ end trace c0e66770b4ca49ed ]---

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