linux-kernel - Re: [PATCH v7 0/3] remoteproc: imx_rproc: allow attaching to running core kicked by the bootloader

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Message-ID: <aHZ1zRiAuX2PVYcU@p14s>
Date: Tue, 15 Jul 2025 09:37:49 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Hiago De Franco <hiagofranco@...il.com>, linux-pm@...r.kernel.org,
	linux-remoteproc@...r.kernel.org, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Bjorn Andersson <andersson@...nel.org>,
	Hiago De Franco <hiago.franco@...adex.com>, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Peng Fan <peng.fan@....nxp.com>, daniel.baluta@....com,
	iuliana.prodan@....nxp.com,
	"Rafael J . Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v7 0/3] remoteproc: imx_rproc: allow attaching to running
 core kicked by the bootloader

Hi,

On Tue, Jul 15, 2025 at 01:49:42PM +0200, Ulf Hansson wrote:
> Hi Mathieu,
> 
> On Thu, 3 Jul 2025 at 18:45, Mathieu Poirier <mathieu.poirier@...aro.org> wrote:
> >
> > Hi Hiago,
> >
> > Many thanks for re-working the changelog and comments in this patchset, things
> > are much clearer now.
> >
> > Thanks,
> > Mathieu
> >
> > On Sun, Jun 29, 2025 at 02:25:09PM -0300, Hiago De Franco wrote:
> > > From: Hiago De Franco <hiago.franco@...adex.com>
> > >
> > > This patch series depends on Ulf's patches that are currently under
> > > review, "pmdomain: Add generic ->sync_state() support to genpd" [1].
> > > Without them, this series is not going to work.
> 
> The series above have been queued for v6.17 in my pmdomain tree.
> 
> Do I have your ack to pick $subject series via my pmdomain tree for
> v6.17 too or do you think it's better to postpone to v6.18?
> 

I may have spotted an error condition that is not handled properly in 3/3 of
this series.  Given that we are already at rc6, it is probably better to way
for the next cycle.

Thanks for sheperding this work.

> Kind regards
> Uffe
> 
> > >
> > > For the i.MX8X and i.MX8 family SoCs, currently when the remotecore is
> > > started by the bootloader and the M core and A core are in the same
> > > partition, the driver is not capable to detect the remote core and
> > > report the correct state of it.
> > >
> > > This patch series implement a new function, dev_pm_genpd_is_on(), which
> > > returns the power status of a given power domain (M core power domains
> > > IMX_SC_R_M4_0_PID0 and IMX_SC_R_M4_0_MU_1A in this case). If it is
> > > already powered on, the driver will attach to it.
> > >
> > > Finally, the imx_rproc_clk_enable() function was also changed to make it
> > > return before dev_clk_get() is called, as it currently generates an SCU
> > > fault reset if the remote core is already running and the kernel tries
> > > to enable the clock again. These changes are a follow up from a v1 sent
> > > to imx_rproc [2] and from a reported regression [3].
> > >
> > > [1] https://lore.kernel.org/all/20250523134025.75130-1-ulf.hansson@linaro.org/
> > > [2] https://lore.kernel.org/lkml/20250423155131.101473-1-hiagofranco@gmail.com/
> > > [3] https://lore.kernel.org/lkml/20250404141713.ac2ntcsjsf7epdfa@hiago-nb/
> > >
> > > v7:
> > > - Added Peng reviewed-by.
> > > v6:
> > > - https://lore.kernel.org/all/20250626215911.5992-1-hiagofranco@gmail.com/
> > > v5:
> > > - https://lore.kernel.org/all/20250617193450.183889-1-hiagofranco@gmail.com/
> > > v4:
> > > - https://lore.kernel.org/lkml/20250602131906.25751-1-hiagofranco@gmail.com/
> > > v3:
> > > - https://lore.kernel.org/all/20250519171514.61974-1-hiagofranco@gmail.com/
> > > v2:
> > > - https://lore.kernel.org/lkml/20250507160056.11876-1-hiagofranco@gmail.com/
> > > v1:
> > > - https://lore.kernel.org/lkml/20250505154849.64889-1-hiagofranco@gmail.com/
> > >
> > > Hiago De Franco (3):
> > >   pmdomain: core: introduce dev_pm_genpd_is_on()
> > >   remoteproc: imx_rproc: skip clock enable when M-core is managed by the
> > >     SCU
> > >   remoteproc: imx_rproc: detect and attach to pre-booted remote cores
> > >
> > >  drivers/pmdomain/core.c        | 33 +++++++++++++++++++++++++++
> > >  drivers/remoteproc/imx_rproc.c | 41 ++++++++++++++++++++++++++++------
> > >  include/linux/pm_domain.h      |  6 +++++
> > >  3 files changed, 73 insertions(+), 7 deletions(-)
> > >
> > > --
> > > 2.39.5
> > >