media: venus: core, venc, vdec: Fix probe dependency error

Commit aaaa93eda64b ("media] media: venus: venc: add video encoder files")
is the last in a series of three commits to add core.c vdec.c and venc.c
adding core, encoder and decoder.

The encoder and decoder check for core drvdata as set and return -EPROBE_DEFER
if it has not been set, however both the encoder and decoder rely on
core.v4l2_dev as valid.

core.v4l2_dev will not be valid until v4l2_device_register() has completed
in core.c's probe().

Normally this is never seen however, Dmitry reported the following
backtrace when compiling drivers and firmware directly into a kernel image.

[ 5.259968] Hardware name: Qualcomm Technologies, Inc. Robotics RB5 (DT)
[ 5.269850] sd 0:0:0:3: [sdd] Optimal transfer size 524288 bytes
[ 5.275505] Workqueue: events deferred_probe_work_func
[ 5.275513] pstate: 60400005 (nZCv daif +PAN -UAO -TCO BTYPE=--)
[ 5.441211] usb 2-1: new SuperSpeedPlus Gen 2 USB device number 2 using xhci-hcd
[ 5.442486] pc : refcount_warn_saturate+0x140/0x148
[ 5.493756] hub 2-1:1.0: USB hub found
[ 5.496266] lr : refcount_warn_saturate+0x140/0x148
[ 5.500982] hub 2-1:1.0: 4 ports detected
[ 5.503440] sp : ffff80001067b730
[ 5.503442] x29: ffff80001067b730
[ 5.592660] usb 1-1: new high-speed USB device number 2 using xhci-hcd
[ 5.598478] x28: ffff6c6bc1c379b8
[ 5.598480] x27: ffffa5c673852960 x26: ffffa5c673852000
[ 5.598484] x25: ffff6c6bc1c37800 x24: 0000000000000001
[ 5.810652] x23: 0000000000000000 x22: ffffa5c673bc7118
[ 5.813777] hub 1-1:1.0: USB hub found
[ 5.816108] x21: ffffa5c674440000 x20: 0000000000000001
[ 5.820846] hub 1-1:1.0: 4 ports detected
[ 5.825415] x19: ffffa5c6744f4000 x18: ffffffffffffffff
[ 5.825418] x17: 0000000000000000 x16: 0000000000000000
[ 5.825421] x15: 00000a4810c193ba x14: 0000000000000000
[ 5.825424] x13: 00000000000002b8 x12: 000000000000f20a
[ 5.825427] x11: 000000000000f20a x10: 0000000000000038
[ 5.845447] usb 2-1.1: new SuperSpeed Gen 1 USB device number 3 using xhci-hcd
[ 5.845904]
[ 5.845905] x9 : 0000000000000000 x8 : ffff6c6d36fae780
[ 5.871208] x7 : ffff6c6d36faf240 x6 : 0000000000000000
[ 5.876664] x5 : 0000000000000004 x4 : 0000000000000085
[ 5.882121] x3 : 0000000000000119 x2 : ffffa5c6741ef478
[ 5.887578] x1 : 3acbb3926faf5f00 x0 : 0000000000000000
[ 5.893036] Call trace:
[ 5.895551] refcount_warn_saturate+0x140/0x148
[ 5.900202] __video_register_device+0x64c/0xd10
[ 5.904944] venc_probe+0xc4/0x148
[ 5.908444] platform_probe+0x68/0xe0
[ 5.912210] really_probe+0x118/0x3e0
[ 5.915977] driver_probe_device+0x5c/0xc0
[ 5.920187] __device_attach_driver+0x98/0xb8
[ 5.924661] bus_for_each_drv+0x68/0xd0
[ 5.928604] __device_attach+0xec/0x148
[ 5.932547] device_initial_probe+0x14/0x20
[ 5.936845] bus_probe_device+0x9c/0xa8
[ 5.940788] device_add+0x3e8/0x7c8
[ 5.944376] of_device_add+0x4c/0x60
[ 5.948056] of_platform_device_create_pdata+0xbc/0x140
[ 5.953425] of_platform_bus_create+0x17c/0x3c0
[ 5.958078] of_platform_populate+0x80/0x110
[ 5.962463] venus_probe+0x2ec/0x4d8
[ 5.966143] platform_probe+0x68/0xe0
[ 5.969907] really_probe+0x118/0x3e0
[ 5.973674] driver_probe_device+0x5c/0xc0
[ 5.977882] __device_attach_driver+0x98/0xb8
[ 5.982356] bus_for_each_drv+0x68/0xd0
[ 5.986298] __device_attach+0xec/0x148
[ 5.990242] device_initial_probe+0x14/0x20
[ 5.994539] bus_probe_device+0x9c/0xa8
[ 5.998481] deferred_probe_work_func+0x74/0xb0
[ 6.003132] process_one_work+0x1e8/0x360
[ 6.007254] worker_thread+0x208/0x478
[ 6.011106] kthread+0x150/0x158
[ 6.014431] ret_from_fork+0x10/0x30
[ 6.018111] ---[ end trace f074246b1ecdb466 ]---

This patch fixes by

- Only setting drvdata after v4l2_device_register() completes
- Moving v4l2_device_register() so that suspend/reume in core::probe()
stays as-is
- Changes pm_ops->core_function() to take struct venus_core not struct
device
- Minimal rework of v4l2_device_*register in probe/remove

Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: venus: introduce core selection

Presently the core (vcodec pipelines) assignment is static. Here we
introduce dynamic load balancing across the cores depending on the
current session load. The load on earch core is calculated and core
with minimum load is assigned to given instance. This will be
applicable on Venus v4 with more than one vcodec cores.

Signed-off-by: Aniket Masule <amasule@codeaurora.org>
Co-developed-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

media: venus: redesign clocks and pm domains control

Redesign core (vcodec) clock control to give the venus core more
freedom to control them in order to make possible to use core
selection feature on Venus IP v4.

Move all clock and pmdomain functions in separate file and abstract
power control with common operations per Venus IP version.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>