On 03/25, Lina Iyer wrote: > SPM is a hardware block that controls the peripheral logic surrounding > the application cores (cpu/l$). When the core executes WFI instruction, > the SPM takes over the putting the core in low power state as > configured. The wake up for the SPM is an interrupt at the GIC, which > then completes the rest of low power mode sequence and brings the core > out of low power mode. > > The SPM has a set of control registers that configure the SPMs > individually based on the type of the core and the runtime conditions. > SPM is a finite state machine block to which a sequence is provided and > it interprets the bytes and executes them in sequence. Each low power > mode that the core can enter into is provided to the SPM as a sequence. > > Configure the SPM to set the core (cpu or L2) into its low power mode, > the index of the first command in the sequence is set in the SPM_CTL > register. When the core executes ARM wfi instruction, it triggers the > SPM state machine to start executing from that index. The SPM state > machine waits until the interrupt occurs and starts executing the rest > of the sequence until it hits the end of the sequence. The end of the > sequence jumps the core out of its low power mode. > > Add support for an idle driver to set up the SPM to place the core in > Standby or Standalone power collapse mode when the core is idle. > > Based on work by: Mahesh Sivasubramanian <[email protected]>, > Ai Li <[email protected]>, Praveen Chidambaram <[email protected]> > Original tree available at - > git://codeaurora.org/quic/la/kernel/msm-3.10.git > > Cc: Stephen Boyd <[email protected]> > Cc: Arnd Bergmann <[email protected]> > Cc: Kevin Hilman <[email protected]> > Cc: Daniel Lezcano <[email protected]> > Signed-off-by: Lina Iyer <[email protected]> > ---
Reviewed-by: Stephen Boyd <[email protected]> I suppose you're going to wait for 4.2 on this? It seems to depend on dlezcano's patches in the cpuidle tree and some scm patches that have gone through arm-soc. -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
