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

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Date:   Mon, 25 Jul 2022 10:04:25 +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
> 
> 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.

Regards,
Peng.

> 
> > The reference manual would be public soon I think, then you could have
> > more information.
> 
> Looking forward to it :)
> 
> Regards,
>   Marco