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 gateway 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, which was used temporarily) seems to resolve this issue. The problem did no show up anymore for 1000 restarts. Please note that only rtl8192cufw_TMSC.bin has been tested. Unrelated of this USB problem, another issue still remains: Using the rtl8192cu driver, scanning for available SSIDs yields no more results after a few hundred scans (iw wlan0 scan). Also, 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 am unsure of whether they need to be reflected in rtl8192cu and/or rtl8xxxu. What I could spot for sure however, is that some tables have been updated: https://github.com/rettichschnidi/linux/commit/0c865ba26aba907b601b3b73c82111dd10e59ffe I am unsure if this changes are relevant and how the best way would be to ensure that this commit does not break old drivers out there. Reto Schneider (1): rtlwifi: v88.2 firmware files for RTL8192CU WHENCE | 6 ++++++ rtlwifi/rtl8192cufw_A.bin | Bin 16116 -> 16126 bytes rtlwifi/rtl8192cufw_B.bin | Bin 16096 -> 16096 bytes rtlwifi/rtl8192cufw_TMSC.bin | Bin 16116 -> 16126 bytes 4 files changed, 6 insertions(+) -- 2.20.1
