RE: [EXT] Re: [PATCH] wifi: mwifiex: added extra delay for firmware ready.

[David Lin]

> From: Brian Norris <briannorris@xxxxxxxxxxxx>
> Sent: Wednesday, December 6, 2023 4:27 AM
> To: David Lin <yu-hao.lin@xxxxxxx>
> Cc: linux-wireless@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> kvalo@xxxxxxxxxx; francesco@xxxxxxxxxx; Pete Hsieh
> <tsung-hsien.hsieh@xxxxxxx>
> Subject: [EXT] Re: [PATCH] wifi: mwifiex: added extra delay for firmware ready.
> 
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> On Tue, Nov 28, 2023 at 04:25:44PM +0800, David Lin wrote:
> > For SDIO IW416, in a corner case FW may return ready before complete
> > full initialization.
> > Command timeout may occur at driver load after reboot.
> 
> Do you have any idea why? Is it specific to this chip and/or firmware?
> I'm hesitant to add magic sleeps to everything, just because you have one
> buggy chip/firmware.
> 
> If it's a known issue with a single chip, it seems like you should add a flag to
> struct mwifiex_sdio_device / mwifiex_sdio_sd8978.
> 

This issue is reported by customer
We confirmed it's specific to this chip and 100ms is sufficient and relatively safe/easy then change FW. 

Will add flag to struct mwifiex_sdio_device / mwifiex_sdio_sd8978

> Brian
> 
> > Workaround by adding 100ms delay at checking FW status.
> >
> > Signed-off-by: David Lin <yu-hao.lin@xxxxxxx>