The vendor driver rtl8188C_8192C_usb_linux_v4.0.1_6911.20130308 includes
new firmware files. These were extracted from data statements in that
driver to form these files.
Before this update, with version 80 of the firmware, the USB interface
of the RTL8192CU WLAN controller often locked itself up:
usb 1-2: device descriptor read/64, error -110
usb 1-2: device not accepting address 4, error -110
usb 1-2: device not accepting address 5, error -110
usb usb1-port2: unable to enumerate USB device
usb 2-2: device descriptor read/64, error -110
usb 2-2: device descriptor read/64, error -110
On ARMv5 based GARDENA smart gateways running Linux 4.19.78, this can
be reliably reproduced by rebooting (warm) the gateway multiple times
(max. 50 attempts needed).
Unlike users having this issues on a USB Wi-Fi dongle, resetting of the
chip by replugging is not an option on this gateway due to the lack of
any power cut functionality. Therefore, a (cold) reboot of the whole
gateway is needed.
Updating the firmware of the RTL8192CU WLAN controller from version
v80.0 to v88.2 (as per output of rtl8xxxu) resolves this issue.
The problem did no show up anymore for 1000 restarts.
Please note:
- Only rtl8192cufw_TMSC.bin tested (mainly on rtl8xxxu)
- rtl8192cu seems to work as well as before, but I can not rule out
that this new firmware version brings unwanted changes.
The Realtek drivers containing v88.2 of the firmware
(v4.0.1_6911.20130308 to v4.0.9_25039.20171107) have some changes
compared to the version v3.4.2_3727.20120404, for which I do not know
if those should be reflected in rtl8192cu.
Unrelated of the initially described USB problem, another issue still
remains after updating the firmware: Using the rtl8192cu driver,
scanning for available SSIDs yields no more results after a few hundred
scans (iw wlan0 scan). rtl8xxxu does not suffer from this problem.
Signed-off-by: Reto Schneider <code@reto-schneider.ch>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Tested-by: Chris Chiu <chiu@endlessos.org>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>
Reto Schneider