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This patch adds the support for reading the power gating status of various devices present on Sunrise Point PCH. This is intended to be used for debugging purpose while tuning the platform for power optimizations and also to understand which devices (on PCH) are blocking the system to enter a low power state. Power Management Controller on Sunrise Point PCH provides access to "PGD PFET Enable Ack Status Registers (ppfear)". This patch reads and decodes this register and dumps the output in formatted manner showing various devices present on the PCH and their "Power Gating" status. Further documentation can be found in Intel 7th Gen Core family mobile u/y processor io datasheet volume 2. Sample output (stripped and not in order): cat /sys/kernel/debug/pmc_core/pch_ip_power_gating_status PMC State: Not Power gated OPI-DMI State: Not Power gated XHCI State: Power gated LPSS State: Power gated CSME_PSF State: Not power gated Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@intel.com> Signed-off-by: Darren Hart <dvhart@linux.intel.com> |
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