Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx> wrote:
> RTL8811AU stops responding during the firmware download on some systems:
>
> [ 809.256440] rtw_8821au 5-2.1:1.0: Firmware version 42.4.0, H2C version 0
> [ 812.759142] rtw_8821au 5-2.1:1.0 wlp48s0f4u2u1: renamed from wlan0
> [ 837.315388] rtw_8821au 1-4:1.0: write register 0x1ef4 failed with -110
> [ 867.524259] rtw_8821au 1-4:1.0: write register 0x1ef8 failed with -110
> [ 868.930976] rtw_8821au 5-2.1:1.0 wlp48s0f4u2u1: entered promiscuous mode
> [ 897.730952] rtw_8821au 1-4:1.0: write register 0x1efc failed with -110
>
> Each write takes 30 seconds to fail because that's the timeout currently
> used for control messages in rtw_usb_write().
>
> In this scenario the firmware download takes at least 2000 seconds.
> Because this is done from the USB probe function, the long delay makes
> other things in the system hang.
>
> Reduce the timeout to 500 ms. This is the value used by the official USB
> wifi drivers from Realtek.
A question about timeout time. Is this enough for USB 2 or older?
>
> Of course this only makes things hang for ~30 seconds instead of ~30
> minutes. It doesn't fix the firmware download.
>
> Tested with RTL8822CU, RTL8812BU, RTL8811CU, RTL8814AU, RTL8811AU,
> RTL8812AU, RTL8821AU, RTL8723DU.
>
> Cc: stable@xxxxxxxxxxxxxxx
> Fixes: a82dfd33d123 ("wifi: rtw88: Add common USB chip support")
> Link: https://github.com/lwfinger/rtw88/issues/344
> Signed-off-by: Bitterblue Smith <rtl8821cerfe2@xxxxxxxxx>
Acked-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
