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Subject: Re: [PATCH v2 0/1] Updating RTL8192CU firmware
To:     linux-firmware@kernel.org
Cc:     linux-wireless@vger.kernel.org
References: <20200323024500.4090-1-code@reto-schneider.ch>
 <20200323225809.11594-1-code@reto-schneider.ch>
From:   Reto Schneider <code@reto-schneider.ch>
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Message-ID: <2dcb37a5-7d55-716c-bedf-d1270700efab@reto-schneider.ch>
Date:   Thu, 3 Sep 2020 19:57:43 +0200
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On 3/23/20 11:58 PM, Reto Schneider wrote:
> 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(+)
> 

Is there anything left I need to do in order to get this patch merged?

Reto

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