netdev - Re: [PATCH net] net: stmmac: dwmac-imx: request high frequency mode

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Message-ID:
 <PAXPR04MB918574D60B71B5B36C2429AC89CBA@PAXPR04MB9185.eurprd04.prod.outlook.com>
Date: Wed, 4 Oct 2023 20:16:15 +0000
From: Shenwei Wang <shenwei.wang@....com>
To: Florian Fainelli <f.fainelli@...il.com>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Shawn Guo
	<shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Maxime Coquelin
	<mcoquelin.stm32@...il.com>
CC: Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu
	<joabreu@...opsys.com>, Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, dl-linux-imx <linux-imx@....com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-stm32@...md-mailman.stormreply.com"
	<linux-stm32@...md-mailman.stormreply.com>, "imx@...ts.linux.dev"
	<imx@...ts.linux.dev>, Mario Ignacio Castaneda Lopez
	<mario.ignacio.castaneda.lopez@....com>
Subject: Re: [PATCH net] net: stmmac: dwmac-imx: request high frequency mode


> -----Original Message-----
> From: Florian Fainelli <f.fainelli@...il.com>
> Sent: Wednesday, October 4, 2023 3:00 PM
> To: Shenwei Wang <shenwei.wang@....com>; David S. Miller
> > Signed-off-by: Mario Castaneda <mario.ignacio.castaneda.lopez@....com>
> > Signed-off-by: Shenwei Wang <shenwei.wang@....com>
> > Tested-by: Mario Castaneda <mario.ignacio.castaneda.lopez@....com>
> 
> I assume that you cannot go full dynamic and adjust the bus frequency based
> upon the negotiated link speed? There may be a need to adjust the bus
> frequency prior to starting any DMA transfers, otherwise dynamic frequency
> scaling of the bus may cause all sorts of issues?

Once BUS_FREQ_HIGH is requested, the system will not change the bus frequency 
when transitioning to a low power state. 
The hardware supports glitch-free frequency scaling, so blocks like DMA will not be 
affected during bus frequency adjustments.

Regards,
Shenwei
 
> 
> Regardless of the answer:
> 
> Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
> --
> Florian