Hi, On Fri, Sep 02, 2022 at 10:05:11AM +0530, Rajendra Nayak wrote: > Add cpu and llcc BWMON nodes and their corresponding > OPP tables for sc7280 SoC. > > Signed-off-by: Rajendra Nayak <quic_rjendra@xxxxxxxxxxx> > Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx> I found that with a v6.1 kernel AOSS on sc7280 doesn't reach it's low power state during system. This can be observed on herobrine based boards on which the AP_SUSPEND signal should transition to 1 during system suspend. If it doesn't the Embedded Controller (EC) notices it and wakes the system up again. Bisection points to this patch, the issue only occurs when CONFIG_QCOM_ICC_BWMON is *not* set. One might think the patch shouldn't have any impact at all when the driver is not enabled, but it does. Debugging shows that the issue is interconnect related. A bare platform device is created for each bwmon devices, which results in the average and peak bandwidth of the interconnect link to be set 'initially' to INT_MAX. The driver is supposed to call icc_sync_state() during probe, which would set the initially bandwidths to 0 and determine the actually needed bandwidth. But since the driver isn't probed the initial bandwidths stay at INT_MAX. This isn't actually an issue with this patch, but how the interconnect framework deals with devices that are registered on the bus, but aren't probed (yet). Not sure how this would be best fixed. Georgi, do you have any ideas? Thanks Matthias
