On Tue, Feb 20, 2018 at 09:58:16AM +0000, Matt Redfearn wrote: > If a JTAG probe is connected to a MIPS cluster, then the CPC detects it > and latches the CPC.STAT_CONF.EJTAG_PROBE bit to 1. While set, > attempting to send a power-down command to a core will be blocked, and > the CPC will instead send the core to clock-off state. This can > interfere with systems fully entering a low power state where all > cores, CM, GIC, etc are powered down. > > Detect that a JTAG probe is / has been connected to the cluster and > block the suspend attempt. > > Attempting to suspend the system while a JTAG probe is connected now > yields: > # echo mem > /sys/power/state > [ 11.654000] PM: Syncing filesystems ... done. > [ 11.658000] JTAG probe is connected - abort suspend > -sh: echo: write error: Operation not permitted > # > > To restore suspend, the JTAG probe should be disconnected or put into > quiescent state. Platform code can then clear the > CPC.STAT_CONF.EJTAG_PROBE bit. > > Reported-by: Ed Blake <ed.blake@xxxxxxxxxxx> > Signed-off-by: Matt Redfearn <matt.redfearn@xxxxxxxx> Thanks, applied for 4.17. Cheers James
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