linux-kernel - RE: [PATCH] soc: imx: imx93-blk-ctrl: set priority level

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Message-ID: <DU0PR04MB9417A6E7A7D4A8C7EB55777188949@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date:   Tue, 26 Jul 2022 11:55:38 +0000
From:   Peng Fan <peng.fan@....com>
To:     Marco Felsch <m.felsch@...gutronix.de>
CC:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] soc: imx: imx93-blk-ctrl: set priority level

> Subject: Re: [PATCH] soc: imx: imx93-blk-ctrl: set priority level
> 
> Hi Peng,
> 
> On 22-07-25, Peng Fan wrote:
> > > Subject: Re: [PATCH] soc: imx: imx93-blk-ctrl: set priority level
> > >
> > > On 22-07-25, Peng Fan wrote:
> > > > Hi Marco,
> > > >
> > > > > Subject: Re: [PATCH] soc: imx: imx93-blk-ctrl: set priority
> > > > > level
> > > > >
> > > > > Hi Peng,
> > > > >
> > > > > thanks for the patch.
> > > > >
> > > > > On 22-07-25, Peng Fan (OSS) wrote:
> > > > > > From: Peng Fan <peng.fan@....com>
> > > > > >
> > > > > > i.MX93 mediamix blk ctrl has registers to set QoS(priority) value.
> > > > > > It support default QoS value and cfg QoS value. Set an initial
> > > > > > value from i.MX design team. If LCDIF/ISI/PXP wanna a
> > > > > > different QoS value in future, they could use interconnect to
> request bandwidth.
> > > > >
> > > > > I need to ask here. Does the iMX93 use the same interconnect as
> > > > > the
> > > > > iMX8M* does?
> > > >
> > > > No. i.MX93 use different interconnect, it has different design,
> > > > the QoS priority register are distributed in blk ctrl.
> > >
> > > Did just the interface change e.g. how you configure the
> > > interconnect or is it a complete new interconnect?
> >
> > It is different interconnect IP. The QoS(priority) register is not in
> > a central place, they are spread in the mix blk ctrl register space,
> > most blk ctrl has QoS. By configure the register in BLK CTRL, the QoS
> > value will flow into the interconnect IP.
> >
> > But compared with i.MX8M, it is simpler.
> 
> Okay, I got both points. Just to be clear (and sorry for my persistency
> here) it is not just a different IP interface for the NOC?

The interconnect IP is a different IP, not NOC. Before RM public,
I could not say what it is.

> 
> So to be on the same page with you: On the i.MX93 we now have the
> BLKCTRL settting the interconnect priority and a interconnect setting for
> advanced traffic shaping like bandwidth reservation?

For mediamix, the programming registers is in mediamix blk ctrl.

Regards,
Peng.
> 
> Regards,
>   Marco