It is necessary to implement psci_features callback
to report supported features for linux kernel to
decide whether to proceed psci calls, for example,
linux deep sleep mode is ONLY entered when psci_features
returns TRUE when linux kernel checks whether
system suspend is supported by calling psci_features,
otherwise, s2idle will be entered instead.
Signed-off-by: Anson Huang <anson.hu...@nxp.com>
---
no change since V1.
arch/arm/mach-imx/mx7/psci.S | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/arch/arm/mach-imx/mx7/psci.S b/arch/arm/mach-imx/mx7/psci.S
index cbe6781..694cef7 100644
--- a/arch/arm/mach-imx/mx7/psci.S
+++ b/arch/arm/mach-imx/mx7/psci.S
@@ -23,6 +23,22 @@
.arch_extension sec
+imx_psci_supported_table:
+ .word ARM_PSCI_0_2_FN_CPU_OFF
+ .word ARM_PSCI_RET_SUCCESS
+ .word ARM_PSCI_0_2_FN_CPU_ON
+ .word ARM_PSCI_RET_SUCCESS
+ .word ARM_PSCI_0_2_FN_AFFINITY_INFO
+ .word ARM_PSCI_RET_SUCCESS
+ .word ARM_PSCI_0_2_FN_SYSTEM_OFF
+ .word ARM_PSCI_RET_SUCCESS
+ .word ARM_PSCI_0_2_FN_SYSTEM_RESET
+ .word ARM_PSCI_RET_SUCCESS
+ .word ARM_PSCI_1_0_FN_SYSTEM_SUSPEND
+ .word ARM_PSCI_RET_SUCCESS
+ .word 0
+ .word ARM_PSCI_RET_NI
+
.global ddrc_enter_self_refresh
ddrc_enter_self_refresh:
/* let DDR out of self-refresh */
@@ -112,6 +128,20 @@ v7_invalidate_l1:
isb
mov pc, lr
+.globl psci_features
+psci_features:
+ adr r2, imx_psci_supported_table
+1: ldr r3, [r2]
+ cmp r3, #0
+ beq out_psci_features
+ cmp r1, r3
+ addne r2, r2, #8
+ bne 1b
+
+out_psci_features:
+ ldr r0, [r2, #4]
+ bx lr
+
.globl psci_cpu_on
psci_cpu_on:
push {r4, r5, lr}
--
2.7.4
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