refactor(platforms): remove usage of psci_power_down_wfi

The callers in PSCI will now call wfi() after calling the
pwr_domain_pwr_down() platform hook (previously they were mutually
exclusive). As s

refactor(platforms): remove usage of psci_power_down_wfi

The callers in PSCI will now call wfi() after calling the
pwr_domain_pwr_down() platform hook (previously they were mutually
exclusive). As such, there is no need for platforms to do this
themselves. In fact, it is strongly advisable for platforms not to do
this themselves so that the PSCI can apply any relevant errata
mitigations.

Change-Id: Ic9702edef7503996be24d984e29dfcc13bc3fcba
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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Merge changes I765a7fa0,Ic33f0b6d,I8d1a88c7,I381f96be,I698fa849, ... into integration

* changes:
fix(cpus): clear CPUPWRCTLR_EL1.CORE_PWRDN_EN_BIT on reset
chore(docs): drop the "wfi" from `pwr_

Merge changes I765a7fa0,Ic33f0b6d,I8d1a88c7,I381f96be,I698fa849, ... into integration

* changes:
fix(cpus): clear CPUPWRCTLR_EL1.CORE_PWRDN_EN_BIT on reset
chore(docs): drop the "wfi" from `pwr_domain_pwr_down_wfi`
chore(psci): drop skip_wfi variable
feat(arm): convert arm platforms to expect a wakeup
fix(cpus): avoid SME related loss of context on powerdown
feat(psci): allow cores to wake up from powerdown
refactor: panic after calling psci_power_down_wfi()
refactor(cpus): undo errata mitigations
feat(cpus): add sysreg_bit_toggle

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refactor(mediatek): update API calls to MTK GIC v3 driver

Updated the code to call the API of MTK GIC v3.

Change-Id: I1bb1771dda4d5532b1b818864f823dbb7a38094d
Signed-off-by: Gavin Liu <gavin.liu@me

refactor(mediatek): update API calls to MTK GIC v3 driver

Updated the code to call the API of MTK GIC v3.

Change-Id: I1bb1771dda4d5532b1b818864f823dbb7a38094d
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>

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refactor: panic after calling psci_power_down_wfi()

This function doesn't return and its callers that don't return either
rely on this. Drop the dead attribute and add a panic() after it to make
thi

refactor: panic after calling psci_power_down_wfi()

This function doesn't return and its callers that don't return either
rely on this. Drop the dead attribute and add a panic() after it to make
this expectation explicit. Calling `wfi` in the powerdown sequence is
terminal so even if the function was made to return, there would be no
functional change.

This is useful for a following patch that makes psci_power_down_wfi()
return.

Change-Id: I62ca1ee058b1eaeb046966c795081e01bf45a2eb
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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feat(mt8196): add mcdi driver

Add MCDI driver to manage CPU idle states and optimize power consumption.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I3a2e163730dd997dd72f2ebc1375dea

feat(mt8196): add mcdi driver

Add MCDI driver to manage CPU idle states and optimize power consumption.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I3a2e163730dd997dd72f2ebc1375dea38d728cb7

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feat(mt8196): add pwr_ctrl module for CPU power management

Implement pwr_ctrl module to manage CPU power.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I73a7a8a2d0b120b7225c2f3239901

feat(mt8196): add pwr_ctrl module for CPU power management

Implement pwr_ctrl module to manage CPU power.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I73a7a8a2d0b120b7225c2f323990176397b6e4a5

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feat(mt8196): initialize platform for MediaTek MT8196

- Add basic platform setup.
- Add MT8196 documentation at docs/plat/.
- Add generic CPU helper functions.
- Add basic register address.
- Add ti

feat(mt8196): initialize platform for MediaTek MT8196

- Add basic platform setup.
- Add MT8196 documentation at docs/plat/.
- Add generic CPU helper functions.
- Add basic register address.
- Add timer driver configuration.

Change-Id: I07fcdeb785fcda4a955c11c39a345da4ad05ef04
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>

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