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:
> 
> I originally wondered if there was a power problem when both were simultaneously
> started, but I see that is not the case. To reiterate, the BT must start first
> and complete UART initialization before the wifi starts initializing. It seems
> to me that a suitable msleep() at the start of the SDIO probe routine seems to
> be a viable workaround even though it is not aesthetically pleasing. A sleep of
> 150 ms is too short, but 500 seems to work reliably.

Suggest to apply this workaround but only if UART-BT + SDIO-WiFi, because SDIO
experts didn't remember they have met this problem. They need real hardware to
measure signals to know what it is wrong, but unfortunately they don't have
bandwidth to process this because of limitation of human resources. Sorry
for that.

Ping-Ke