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

[Mathieu Poirier]

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 at toradex.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.
> 
> 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
>