linux-kernel - Re: [PATCH 0/8] interconnect: support i.MX8MP

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Message-ID: <c2034c030333f89e0ac7d86c906dd222cc151d52.camel@pengutronix.de>
Date:   Tue, 14 Jun 2022 19:39:33 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Peng Fan <peng.fan@....com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "djakov@...nel.org" <djakov@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>, Abel Vesa <abel.vesa@....com>,
        "abailon@...libre.com" <abailon@...libre.com>,
        "laurent.pinchart@...asonboard.com" 
        <laurent.pinchart@...asonboard.com>,
        "marex@...x.de" <marex@...x.de>,
        "paul.elder@...asonboard.com" <paul.elder@...asonboard.com>,
        "Markus.Niebel@...tq-group.com" <Markus.Niebel@...tq-group.com>,
        "aford173@...il.com" <aford173@...il.com>
Cc:     "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 0/8] interconnect: support i.MX8MP

Hi Peng,

Am Montag, dem 13.06.2022 um 01:23 +0000 schrieb Peng Fan:
> All,
> 
> > Subject: [PATCH 0/8] interconnect: support i.MX8MP
> 
> I am going to send out V2 this week to address the comments until now.
> But before that I would like to see if any one has any comments on the
> design here.
> 
> Georgi, do you have comments on Patch 2 " interconnect: add device
> managed bulk API"
> 
> Lucas, since you had comments when I first use syscon to configure NoC,
> are you ok with the design to use interconnect in this patchset?
> 
I'm still not 100% convinced that the blk-ctrl is the right consumer
for the interconnect, since it doesn't do any busmastering. However,
the design looks much better than the syscon based one.

I mostly worry about being able to extend this to do more than the
current static configuration if/when NXP decides to release more
information about the NoC configuration options or someone reverse
engineers this part of the SoC. I still hope that we could optimize NoC
usage by setting real bandwidth and latency limits for the devices
connected to the NoC. As the blk-ctrl doesn't have any clue about this
right now, we can't really set any more specific requests than the
current INT_MAX ones.
I guess we could extend things in this way by making the blk-ctrl not
only be a simple consumer of the interconnect, but aggregate requests
from the devices in the blk-ctrl domain and forward them to the NOC
provider, right?

Regards,
Lucas

> Thanks,
> Peng.
> 
> > 
> > From: Peng Fan <peng.fan@....com>
> > 
> > This patchset is to support i.MX8MP NoC settings, i.MX8MP NoC initial value
> > after power up is invalid, need set a valid value after related power domain up.
> > 
> > This patchset also includes two patch[1,2] during my development to enable the
> > ICC feature for i.MX8MP.
> > 
> > I not include ddrc DVFS in this patchset, ths patchset is only to support NoC
> > value mode/priority/ext_control being set to a valid value that suggested by
> > i.MX Chip Design Team. The value is same as NXP downstream one inside Arm
> > Trusted Firmware:
> > https://source.codeaurora.org/external/imx/imx-atf/tree/plat/imx/imx8m/imx
> > 8mp/gpc.c?h=lf_v2.4#n97
> > 
> > A repo created here:
> > https://github.com/MrVan/linux/tree/imx8mp-interconnect
> > 
> > Peng Fan (8):
> >   dt-bindings: interconnect: imx8m: Add bindings for imx8mp noc
> >   interconnect: add device managed bulk API
> >   interconnect: imx: fix max_node_id
> >   interconnect: imx: set src node
> >   interconnect: imx: introduce imx_icc_provider
> >   interconnect: imx: set of_node for interconnect provider
> >   interconnect: imx: configure NoC mode/prioriry/ext_control
> >   interconnect: imx: Add platform driver for imx8mp
> > 
> >  .../bindings/interconnect/fsl,imx8m-noc.yaml  |   6 +
> >  drivers/interconnect/bulk.c                   |  34 +++
> >  drivers/interconnect/imx/Kconfig              |   4 +
> >  drivers/interconnect/imx/Makefile             |   2 +
> >  drivers/interconnect/imx/imx.c                |  68 +++--
> >  drivers/interconnect/imx/imx.h                |  25 +-
> >  drivers/interconnect/imx/imx8mm.c             |   2 +-
> >  drivers/interconnect/imx/imx8mn.c             |   2 +-
> >  drivers/interconnect/imx/imx8mp.c             | 232
> > ++++++++++++++++++
> >  drivers/interconnect/imx/imx8mq.c             |   2 +-
> >  include/dt-bindings/interconnect/fsl,imx8mp.h |  59 +++++
> >  include/linux/interconnect.h                  |   6 +
> >  12 files changed, 424 insertions(+), 18 deletions(-)  create mode 100644
> > drivers/interconnect/imx/imx8mp.c  create mode 100644
> > include/dt-bindings/interconnect/fsl,imx8mp.h
> > 
> > --
> > 2.25.1
>