From: Hiago De Franco <hiago.fra...@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 is being added to the new file drivers/firmware/imx/power.c, where all PM related APIs should go. 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-hiagofra...@gmail.com/ [2] https://lore.kernel.org/lkml/20250404141713.ac2ntcsjsf7epdfa@hiago-nb/ v3: - New file introduced, drivers/firmware/imx/power.c, to handle the PM (Power Management) API functions, as suggested in v2. - First patch, "firmware: imx: move get power mode function from scu-pd.c to misc.c" was dropped to make the reviewing process easier and in favor of firmware/imx/power.c file. Moving the power mode function from scu-pd.c as proposed will be sent later in a different future patch, as suggested. v2: - https://lore.kernel.org/lkml/20250507160056.11876-1-hiagofra...@gmail.com/ v1: - https://lore.kernel.org/lkml/20250505154849.64889-1-hiagofra...@gmail.com/ Hiago De Franco (3): firmware: imx: introduce imx_sc_pm_get_resource_power_mode() 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/Makefile | 2 +- drivers/firmware/imx/power.c | 52 +++++++++++++++++++++++++++++ drivers/remoteproc/imx_rproc.c | 17 ++++++++-- include/linux/firmware/imx/svc/pm.h | 9 +++++ 4 files changed, 77 insertions(+), 3 deletions(-) create mode 100644 drivers/firmware/imx/power.c -- 2.39.5
