RE: [RFC] rtw88: Fix startup problems for SDIO wifi plus UART Bluetooth

[Ping-Ke Shih <pkshih@realtek.com>]

Larry Finger <Larry.Finger@gmail.com> wrote:

> As discussed in the links below, the SDIO part of RTW8821CS fails to
> start correctly if such startup happens while the UART portion of
> the chip is initializing. 

I checked with SDIO team internally, but they didn't meet this case, so we may
take this workaround.

SDIO team wonder if something other than BT cause this failure, and after
system boots everything will be well. Could you boot the system without WiFi/BT
drivers, but insmod drivers manually after booting?


> ---
>  drivers/net/wireless/realtek/rtw88/sdio.c | 28 +++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/drivers/net/wireless/realtek/rtw88/sdio.c b/drivers/net/wireless/realtek/rtw88/sdio.c
> index 0cae5746f540..eec0ad85be72 100644
> --- a/drivers/net/wireless/realtek/rtw88/sdio.c
> +++ b/drivers/net/wireless/realtek/rtw88/sdio.c
> @@ -1325,6 +1325,34 @@ int rtw_sdio_probe(struct sdio_func *sdio_func,

[...]

> +       mdelay(500);

Will it better to use sleep function?