netdev - Re: [v5,net-next]net: wwan: t7xx : V5 ptach upstream work

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Date: Fri, 23 Jun 2023 17:01:42 +0200
From: Jose Ignacio Tornos Martinez <jtornosm@...hat.com>
To: bjorn.helgaas@...il.com
Cc: Jinjian.Song@...ocom.com,
	Reid.he@...ocom.com,
	bjorn@...gaas.com,
	haijun.liu@...iatek.com,
	helgaas@...nel.org,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	rafael.wang@...ocom.com,
	somashekhar.puttagangaiah@...el.com,
	jtornosm@...hat.com
Subject: Re: [v5,net-next]net: wwan: t7xx : V5 ptach upstream work

I have a proposal because at this moment with the current status, t7xx is not
functional due to problems like this if there is no activity:
[   57.370534] mtk_t7xx 0000:72:00.0: [PM] SAP suspend error: -110
[   57.370581] mtk_t7xx 0000:72:00.0: can't suspend
    (t7xx_pci_pm_runtime_suspend [mtk_t7xx] returned -110)
and after this the traffic is not working.

As yu know the situation was stalled and it seems that the final solution for
the complete series can take longer, so in order to have at least the modem
working, it would be enough if just the first commit of the series is
re-applied (d20ef656f994 net: wwan: t7xx: Add AP CLDMA). With that, the
Application Processor would be controlled, correctly suspended and the
commented problems would be fixed (I am testing here like this with no related
issue).

I think the first commit of the series is independent of the others and it can
be re-applied cleanly. Later on, the other commits related to fw flashing and 
coredump collection new features could be added taking into account Bjorn's 
comments (and of course updated doc if needed).

Thanks
Jose Ignacio