rtwn: allow firmware rate control to be enabled for rtl8192cu

Although there's no RTS/CTS rate control available yet, the support
is enough to enable firmware rate control for experimenting.

This w

rtwn: allow firmware rate control to be enabled for rtl8192cu

Although there's no RTS/CTS rate control available yet, the support
is enough to enable firmware rate control for experimenting.

This won't be enabled by default - users will need to set a tunable
before loading the driver (eg kenv dev.rtwn.0.ratectl=2) but it is
enough for experimentation, feedback and continued work.

Locally tested:

* RTL8192CU, STA mode

Differential Revision: https://reviews.freebsd.org/D48143
Reviewed by: bz, emaste

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rtwn: disable a workaround introduced earlier for RTL8192CU TX performance

I'm unable to reproduce the original problem with my RTL8192CU USB
devices with the current codebase and I can't find any r

rtwn: disable a workaround introduced earlier for RTL8192CU TX performance

I'm unable to reproduce the original problem with my RTL8192CU USB
devices with the current codebase and I can't find any reference
to what this power register is doing - I see it defined in drivers,
but it's not described or used anywhere.

This reverts 7f740971658d71c1ee95ee68032b4696c1684845 -
rtwn_usb(4): fix Tx instability with RTL8192CU chipsets

In any case being able to do higher rate RTS/CTS is beneficial.

Local testing:

* rtl8192cu, STA mode, TX/RX testing

PR: 233949

Differential Revision: https://reviews.freebsd.org/D48026
Reviewed by: imp

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sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

rtwn: clean up empty lines in .c and .h files

MFHead@r345275

MFhead@r344786

Merge ^/head r344549 through r344775.

rtwn_usb(4): fix Tx instability with RTL8192CU chipsets

- Fix data frames transmission via POWER_STATUS register setup -
it seems to be set by MACID_CONFIG firmware command, which was broken*
in r29

rtwn_usb(4): fix Tx instability with RTL8192CU chipsets

- Fix data frames transmission via POWER_STATUS register setup -
it seems to be set by MACID_CONFIG firmware command, which was broken*
in r290439 and later disabled in r307529.

We can re-enable it later if / when firmware rate adaptation will be
ready; however, this step will be required anyway - for firmware-less
builds.

- Force RTS / CTS protection frame rate to CCK1 (this rate works fine
without any additional setup; no better workaround is known yet).

The problem was not observed on the channel 1 or with CCK1 rate enforced
('ifconfig wlan0 ucastrate 1' for 11 b/g; not possible for 11n networks
due to ifconfig(8) bug).

* I'm not sure if it works before r290439 because - AFAIR - I never seen
firmware rate adaptation working for 10-STABLE urtwn(4)
(It needs EN_BCN bit set and RSSI updates at least).

Tested with RTL8188CUS in STA mode
(in regular mode and with disabled MRR - DARFRC*8 is set to 0)

PR: 233949
MFC after: 2 weeks

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Merge ^/head r311314 through r311459.

In rtl8188eu, read R92C_HSSI_PARAM2(0)) register to detect whether it needs
to enable CCK high power feature or not.

Reviewed by: avos

Merge ^/head r309263 through r309518.

Fix logic error so the R92C_TDECTRL register value is updated correctly.

Reviewed by: avos

Merge ^/head r307383 through r307735.

rtwn(4), urtwn(4): merge common code, add support for 11ac devices.

All devices:
- add support for rate adaptation via ieee80211_amrr(9);
- use short preamble for transmitted frames when needed;
- m

rtwn(4), urtwn(4): merge common code, add support for 11ac devices.

All devices:
- add support for rate adaptation via ieee80211_amrr(9);
- use short preamble for transmitted frames when needed;
- multi-bss support:
* for RTL8821AU: 2 VAPs at the same time;
* other: 1 any VAP + 1 sta VAP.
RTL8188CE:
- fix IQ calibration bug (reason of significant speed degradation);
- add h/w crypto acceleration support.
USB:
- A-MPDU Tx support;
- short GI support;
Other:
- add support for RTL8812AU / RTL8821AU chipsets
(a/b/g/n only; no ac yet);
- split merged code into subparts:
* bus glue (usb/*, pci/*, rtl*/usb/*, rtl*/pci/*)
* common (if_rtwn*)
* chip-specific (rtl*/*)
- various other bugfixes.

Due to code reorganization, module names / requirements were changed too:
urtwn urtwnfw -> rtwn rtwn_usb rtwnfw
rtwn rtwnfw -> rtwn rtwn_pci rtwnfw

Tested with RTL8188CE, RTL8188CUS, RTL8188EU and RTL8821AU.

Tested by: kevlo, garga,
Peter Garshtja <peter.garshtja@ambient-md.com>,
Kevin McAleavey <kevin.mcaleavey@knosproject.com>,
Ilias-Dimitrios Vrachnis <id@vrachnis.com>,
<otacilio.neto@bsd.com.br>
Relnotes: yes

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