[PATCH v2 0/3] remoteproc: imx_rproc: allow attaching to running core kicked by the bootloader

[Hiago De Franco]

From: Hiago De Franco <hiago.franco at toradex.com>

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 series of patches implement an API call to the SCU which will
return the power mode of a given resource (M core in this case) and if
it is already powered on, the driver will attach to it. This SCU API was
already being used inside pmdomain/imx/scu-pd.c driver, therefore it has
been moved to firmware/imx/misc.c so it can be accessed by imx_rproc
driver.

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 [1] and from a reported regression [2].

[1] https://lore.kernel.org/lkml/20250423155131.101473-1-hiagofranco@gmail.com/
[2] https://lore.kernel.org/lkml/20250404141713.ac2ntcsjsf7epdfa@hiago-nb/

v2:
- Order of commits changed, now "firmware: imx: move get power mode
  function from scu-pd.c to misc.c" comes at first.
- Updated commit description of "remoteproc: imx_rproc: skip clock
  enable when M-core is managed by the SCU" as suggested by Peng.
- Removed "imx_rproc_is_on" function and dropped unnecessary include as
  suggested by Peng.
- Email corrected: peng.fan at oss.nxp.com -> peng.fan at nxp.com

v1:
- https://lore.kernel.org/lkml/20250505154849.64889-1-hiagofranco@gmail.com/

Hiago De Franco (3):
  firmware: imx: move get power mode function from scu-pd.c to misc.c
  remoteproc: imx_rproc: skip clock enable when M-core is managed by the
    SCU
  remoteproc: imx_rproc: add power mode check for remote core attachment

 drivers/firmware/imx/misc.c           | 47 +++++++++++++++++++++++++++
 drivers/pmdomain/imx/scu-pd.c         | 29 ++++-------------
 drivers/remoteproc/imx_rproc.c        | 17 ++++++++--
 include/linux/firmware/imx/svc/misc.h |  8 +++++
 4 files changed, 77 insertions(+), 24 deletions(-)

-- 
2.39.5