[Bug 233949] [rtwn] rtl8192cu packet loss 10-25%, EDIMAX N150

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=233949

--- Comment #13 from commit-hook at freebsd.org ---
A commit references this bug:

Author: avos
Date: Mon Mar  4 03:02:15 UTC 2019
New revision: 344745
URL: https://svnweb.freebsd.org/changeset/base/344745

Log:
  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

Changes:
  head/sys/dev/rtwn/rtl8192c/r92c_reg.h
  head/sys/dev/rtwn/rtl8192c/r92c_tx.c
  head/sys/dev/rtwn/rtl8192c/usb/r92cu_init.c

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