From:   Christian Hewitt <christianshewitt@gmail.com>
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Subject: Bug/Problem with rtl_bt/rtl8822cs_config.bin
Message-Id: <3B9D4DB2-D2CD-44FE-817A-F6EA8A0AD734@gmail.com>
Date:   Tue, 21 Feb 2023 11:13:28 +0400
Cc:     Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Vyacheslav <adeep@lexina.in>
To:     Hilda Wu <hildawu@realtek.com>, Josh Boyer <jwboyer@kernel.org>,
        Linux Firmware <linux-firmware@kernel.org>,
        Bluez mailing list <linux-bluetooth@vger.kernel.org>
Precedence: bulk

I=E2=80=99m working with the RTL8822CS WiFi/BT mezzanine for BananaPi =
M2S/M5 boards.

SDIO WiFi works fine. The BT side fails to load firmware:

[    7.413297] Bluetooth: hci0: RTL: examining hci_ver=3D0a hci_rev=3D000c=
 lmp_ver=3D0a lmp_subver=3D8822
[    7.416873] Bluetooth: hci0: RTL: rom_version status=3D0 version=3D3
[    7.416892] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_fw.bin
[    7.418200] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_config.bin
[    7.453778] Bluetooth: hci0: RTL: cfg_sz 33, total sz 36529
[    9.469947] Bluetooth: hci0: command 0xfc20 tx timeout
[   17.629661] Bluetooth: hci0: RTL: download fw command failed (-110)

The same is also observed on an Amlogic Android box with 08 silicon:

[    3.950116] Bluetooth: hci0: RTL: examining hci_ver=3D08 hci_rev=3D000c=
 lmp_ver=3D08 lmp_subver=3D8822
[    3.963304] Bluetooth: hci0: RTL: rom_version status=3D0 version=3D3
[    3.969522] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_fw.bin
[    3.969556] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_config.bin
[    4.026336] Bluetooth: hci0: RTL: cfg_sz 33, total sz 36529
[    6.086301] Bluetooth: hci0: command 0xfc20 tx timeout
[   14.566290] Bluetooth: hci0: RTL: download fw command failed (-110)

The device is working in Armbian who bundle an older firmware:

[    7.319820] Bluetooth: hci0: RTL: examining hci_ver=3D0a hci_rev=3D000c=
 lmp_ver=3D0a lmp_subver=3D8822
[    7.323114] Bluetooth: hci0: RTL: rom_version status=3D0 version=3D3
[    7.323150] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_fw.bin
[    7.325103] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_config.bin
[    7.348972] Bluetooth: hci0: RTL: cfg_sz 73, total sz 40777
[    7.699139] Bluetooth: hci0: RTL: fw version 0x05a91a4a

However it=E2=80=99s not a regression in firmware. Further testing =
pinpointed the
rtl8822cs_config.bin file. I can use the latest firmware (FFB8_ABD6) =
with
the config file bundled with Armbian:

[    7.504405] Bluetooth: hci0: RTL: examining hci_ver=3D0a hci_rev=3D000c=
 lmp_ver=3D0a lmp_subver=3D8822
[    7.507827] Bluetooth: hci0: RTL: rom_version status=3D0 version=3D3
[    7.507850] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_fw.bin
[    7.509158] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_config.bin
[    7.529486] Bluetooth: hci0: RTL: cfg_sz 73, total sz 36569
[    7.850914] Bluetooth: hci0: RTL: fw version 0xffb8abd6

I can also use the oldest upstream firmware with the Armbian config:

[    7.315358] Bluetooth: hci0: RTL: examining hci_ver=3D0a hci_rev=3D000c=
 lmp_ver=3D0a lmp_subver=3D8822
[    7.318754] Bluetooth: hci0: RTL: rom_version status=3D0 version=3D3
[    7.318772] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_fw.bin
[    7.319680] Bluetooth: hci0: RTL: loading rtl_bt/rtl8822cs_config.bin
[    7.341340] Bluetooth: hci0: RTL: cfg_sz 73, total sz 30817
[    7.612533] Bluetooth: hci0: RTL: fw version 0x05990d54

The config file Armbian are using [0] is sourced from an Amlogic =
(Android) BSP
repo shared to manufacturer Jethome (Vyacheslav on CC). There is no =
obvious
version info. There are newer (more recently committed) config files =
available
in updates to the Amlogic repo (alongside older 0599_0D54 firmware) and =
all work
with any upstream firmware file.

I=E2=80=99m happy to apply test patches to get more output and I can =
provide remote
access to the board or arrange hardware to be shipped if that helps at =
all.

Hopefully RTL folks can spot whether this is a driver issue or something =
not
present in the upstream config?

Christian

[0] =
https://github.com/armbian/firmware/blob/master/rtl_bt/rtl8822cs_config.bi=
n