tree 29e377204bafdaf8dfcd72420737421774004475
parent 7d0093277104dbd3c6a94dbf36611767c96e544f
author Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> 1706541828 +0000
committer Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com> 1715159347 +0100

fix(psci): mask the Last in Level nibble in StateId

In the ARM recommended StateID Encoding, the index for the power
level where the calling core is last to go idle use the last niblle
of the StateId.

Even if this nibble is necessary for OS-initiated mode, it can be
used by caller even when this OSI mode is not used.

In arm_validate_power_state() function, the StateId is compared with
content of arm_pm_idle_states[] build with the arm_make_pwrstate_lvl2
macro, without Last in Level information. So it is safe to mask this
nibble for ARM platform in all the cases, and that avoids issues with
caller with use the same StateId encoding with OSI mode activated or
not (in tftf tests for example, the input(power state) parameter =
(0x40001022) and the associated power state is 0x40000022).

Change-Id: I45e8e2b8f526fb61b94cf134d7d4aa3bac4c215d
Signed-off-by: Jayanth Dodderi Chidanand <jayanthdodderi.chidanand@arm.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>