linux-kernel - Re: [PATCH V2 0/6] remoteproc: imx

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Date:   Fri, 3 Feb 2023 15:03:08 +0200
From:   Daniel Baluta <daniel.baluta@...il.com>
To:     Peng Fan <peng.fan@....com>
Cc:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "andersson@...nel.org" <andersson@...nel.org>,
        "mathieu.poirier@...aro.org" <mathieu.poirier@...aro.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "arnaud.pouliquen@...s.st.com" <arnaud.pouliquen@...s.st.com>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...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>
Subject: Re: [PATCH V2 0/6] remoteproc: imx_rproc: support firmware in DDR

On Fri, Feb 3, 2023 at 2:55 PM Peng Fan <peng.fan@....com> wrote:
>
> Hi Daniel
> > Subject: Re: [PATCH V2 0/6] remoteproc: imx_rproc: support firmware in
> > DDR
> >
> > On Fri, Jan 27, 2023 at 11:26 AM Peng Fan (OSS) <peng.fan@....nxp.com>
> > wrote:
> > >
> > > From: Peng Fan <peng.fan@....com>
> > >
> > > V2:
> > >  patch 4 is introduced for sparse check warning fix
> > >
> > > This pachset is to support i.MX8M and i.MX93 Cortex-M core firmware
> > > could be in DDR, not just the default TCM.
> > >
> > > i.MX8M needs stack/pc value be stored in TCML entry address[0,4], the
> > > initial value could be got from firmware first section ".interrupts".
> > > i.MX93 is a bit different, it just needs the address of .interrupts
> > > section. NXP SDK always has .interrupts section.
> > >
> > > So first we need find the .interrupts section from firmware, so patch
> > > 1 is to reuse the code of find_table to introduce a new API
> > > rproc_elf_find_shdr to find shdr, the it could reused by i.MX driver.
> > >
> > > Patch 2 is introduce devtype for i.MX8M/93
> > >
> > > Although patch 3 is correct the mapping, but this area was never used
> > > by NXP SW team, we directly use the DDR region, not the alias region.
> > > Since this patchset is first to support firmware in DDR, mark this
> > > patch as a fix does not make much sense.
> > >
> > > patch 4 and 5 is support i.MX8M/93 firmware in DDR with parsing
> > > .interrupts section. Detailed information in each patch commit message.
> > >
> > > Patches were tested on i.MX8MQ-EVK i.MX8MP-EVK i.MX93-11x11-EVK
> >
> > Hi Peng,
> >
> > Few observations:
> >
> > - bugfixes should come first in the series.
> > - in case we want to patches to be pushed back into stable releases please
> > add "Fixes: " tag.
>
> You mean patch 4: sparse warning fix?
> Or patch 3 is correct the mapping? Or both? For patch 3, I would not take
> it as fix, I just think there is no people using this ddr alias address. If you
> prefer, I could add a fix tag for patch 3.

Yes, I mean patch 3) which is definitely a thing that stable versions
could benefit.