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Instead provide respective RPU >>> start and stop API in the firmware driver and move the logic to interact >>> with the PM firmware in the firmware driver. The remoteproc driver >>> doesn't >>> need to know actual logic, but only the final result i.e. RPU start/stop >>> was success or not. This refactor keeps the remoteproc driver simple and >>> moves firmware interaction logic to the firmware driver. >>> >>> Signed-off-by: Tanmay Shah >>> --- >>>   drivers/firmware/xilinx/zynqmp.c        | 93 +++++++++++++++++++++++++ >>>   drivers/remoteproc/xlnx_r5_remoteproc.c | 68 ++---------------- >>>   include/linux/firmware/xlnx-zynqmp.h    | 12 ++++ >>>   3 files changed, 110 insertions(+), 63 deletions(-) >>> >>> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/ >>> xilinx/zynqmp.c >>> index af838b2dc327..f9a3a95b0638 100644 >>> --- a/drivers/firmware/xilinx/zynqmp.c >>> +++ b/drivers/firmware/xilinx/zynqmp.c >>> @@ -1513,6 +1513,99 @@ int zynqmp_pm_request_wake(const u32 node, >>>   } >>>   EXPORT_SYMBOL_GPL(zynqmp_pm_request_wake); >>>   +/** >>> + * zynqmp_pm_start_rpu - Boot Real-time Processing Unit (Cortex-R) on >>> SoC >>> + * >>> + * @node: power-domains id of the core >>> + * @bootaddr: Boot address of elf >>> + * >>> + * Return: status, either success or error+reason >>> + */ >>> +int zynqmp_pm_start_rpu(const u32 node, const u64 bootaddr) >>> +{ >>> +    enum rpu_boot_mem bootmem; >>> +    int ret; >>> + >>> +    /* >>> +     * The exception vector pointers (EVP) refer to the base-address of >>> +     * exception vectors (for reset, IRQ, FIQ, etc). The reset-vector >>> +     * starts at the base-address and subsequent vectors are on 4-byte >>> +     * boundaries. >>> +     * >>> +     * Exception vectors can start either from 0x0000_0000 (LOVEC) or >>> +     * from 0xFFFF_0000 (HIVEC) which is mapped in the OCM (On-Chip >>> Memory) >> >> here >> >>> +     * >>> +     * Usually firmware will put Exception vectors at LOVEC. >>> +     * >>> +     * It is not recommend that you change the exception vector. >>> +     * Changing the EVP to HIVEC will result in increased interrupt >>> latency >>> +     * and jitter. Also, if the OCM is secured and the Cortex-R5F >>> processor >>> +     * is non-secured, then the Cortex-R5F processor cannot access the >>> +     * HIVEC exception vectors in the OCM. >>> +     */ >>> +    bootmem = (bootaddr >= 0xFFFC0000) ? >> >> and here you have different values without any explanation why. >> > > The value in the comment is correct, but the check is done for all of > OCM address range. This is just refactoring of the interfaces and not > the actual logic. There is a separate patch which actually refactors the > logic, I will send it later. I would like to keep this as it is because > this was originally there, and the intent of the commit is not to modify it. ok. Acked-by: Michal Simek Thanks, Michal