Those commits doesn't affect the power consumption on Intel ICL-Y
SDP(alpha), so I'm not sure if they help on power consumption on real
products.
** Description changed:
Description:
S0ix-states represent the residency in the Intel® SoC idle standby power
states.
The S0ix states shut off part of the SoC when they are not in use. The S0ix
states are triggered when specific conditions within the SoC have been
achieved,
for example: certain components are in low power states. The SoC consumes the
least amount of power in the deepest (for example, S0i3) state.
S0ix is triggered by two paths:
(1) by system PM, e.g "suspend-to-idle" triggered by pressing the power button
on Android device or command manually triggered on any Linux based distros;
(2) by runtime PM, i.e no system activities with display off.
S0ix should simply work in theory with trigger path (1) if we have the device
drivers ready. On GLK, we require the below PCI device drivers with system PM
support. ACPI device requirements are WIP.
I2C designware PCI driver
USB XHCI PCI ID
Intel trace Hub[NPK) PCI ID
SPI BXT PCI ID
SCSI UFS BXT PCI host ID
Graphics
Audio
PWM
HSUART
Security engine
S0ix with trigger path (2) require work as defined below.
All the above device drivers need to support runtime PM (already defined in
the same LCK above)
PCI root port to support runtime PM
Both paths will require intel_idle driver support for S0ix support.
238f9c11351f8af8534ae0318b4d9acc77b09ee8
8aba056a4ea6da18186025a335a96b2f071e69d3
6769fdbe27d782dfee5e459e25b44baacc7c8459
cfb55af9add9c19806300fdb31f4cd25e67c6d1a
4a5861f714293767980e4948c9a7c9e5e09c9b94
2a13096ac7da07a1bfc9d91fc4a982020e7ded2b
cd89e92b7399a69512b8d855a2dd145c47399bf8
d6827015e671cd17871c9b7a0fabe06c044f7470
0e68eeea9894feeba2edf7ec63e4551b87f39621
e50af8332785355de3cb40d9f5e8c45dbfc86f53
Target Kernel: 5.1
Target Release: 19.10
SRU Justification
[Impact]
Requires patches to make new INTEL CPU IceLake support s0ix
[Fix]
The patch list is provided by Intel
238f9c11351f platform/x86: intel_pmc_core: Quirk to ignore XTAL
shutdown
8aba056a4ea6 platform/x86: intel_pmc_core: Add Package cstates residency
info
6769fdbe27d7 platform/x86: intel_pmc_core: Add ICL platform support
cfb55af9add9 platform/x86: intel_pmc_core: Convert to INTEL_CPU_FAM6 macro
4a5861f71429 platform/x86: intel_pmc_core: Avoid a u32 overflow
2a13096ac7da platform/x86: intel_pmc_core: Include Reserved IP for LTR
cd89e92b7399 platform/x86: intel_pmc_core: Fix file permissions for
ltr_show
d6827015e671 platform/x86: intel_pmc_core: Fix PCH IP name
0e68eeea9894 platform/x86: intel_pmc_core: Fix PCH IP sts reading
e50af8332785 platform/x86: intel_pmc_core: Handle CFL regmap properly
Below commit fix 238f9c11351f ("platform/x86: intel_pmc_core: Quirk to ignore
XTAL shutdown")
9ae11e237d95 platform/x86: intel_pmc_core: Mark local function static
[Test]
Verified on Intel ICL-Y SDP with fwts s2idle test 30 times, the system is
still working.
[Regression Risk]
+ Low. Those patches are all small changes, and most of them are adding IDs,
should be safe to include them.
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https://bugs.launchpad.net/bugs/1819413
Title:
[ICL] S0ix Enabling
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