From: Jan Kiszka <[email protected]>
U-Boot returns PSCI_NOT_SUPPORTED, rather than the implemented 0.2.
Filter out all negative return codes.
Fixes: ea924a3fec98 ("arm64: Initialise SMCCC backend")
Signed-off-by: Jan Kiszka <[email protected]>
---
hypervisor/arch/arm-common/smccc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/hypervisor/arch/arm-common/smccc.c
b/hypervisor/arch/arm-common/smccc.c
index 5affa965..7734b999 100644
--- a/hypervisor/arch/arm-common/smccc.c
+++ b/hypervisor/arch/arm-common/smccc.c
@@ -23,8 +23,9 @@ void smccc_discover(void)
ret = smc(PSCI_0_2_FN_VERSION);
- /* We need >=PSCIv1.0 for SMCCC */
- if (PSCI_VERSION_MAJOR(ret) < 1)
+ /* We need >=PSCIv1.0 for SMCCC. Against the spec, U-Boot may also
+ * return a negative error code. */
+ if (ret < 0 || PSCI_VERSION_MAJOR(ret) < 1)
return;
/* Check if PSCI supports SMCCC version call */
--
2.16.4
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