[PATCH] arm64/boot: Don't set PMUv3p9 FGT2 bits without PMUv3

[Fuad Tabba]

On a CPU with FGT2 and an IMPLEMENTATION DEFINED PMU (PMUVer 0b1111),
__init_el2_fgt2 sets the PMUv3p9 bits in HDFGRTR2_EL2 and HDFGWTR2_EL2,
which are RES0 there. The macro only checks that PMUVer is at least
PMUv3p9, and 0b1111 passes.

Exclude 0b1111 before the compare, as __init_el2_debug does.

Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9")
Signed-off-by: Fuad Tabba <fuad.tabba at linux.dev>
---
 arch/arm64/include/asm/el2_setup.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/el2_setup.h b/arch/arm64/include/asm/el2_setup.h
index 87560d8b254e6..1da277baacf78 100644
--- a/arch/arm64/include/asm/el2_setup.h
+++ b/arch/arm64/include/asm/el2_setup.h
@@ -421,8 +421,9 @@
 	mov	x2, xzr
 	mrs	x1, id_aa64dfr0_el1
 	ubfx	x1, x1, #ID_AA64DFR0_EL1_PMUVer_SHIFT, #4
-	cmp	x1, #ID_AA64DFR0_EL1_PMUVer_V3P9
-	b.lt	.Lskip_pmuv3p9_\@
+	cmp	x1, #ID_AA64DFR0_EL1_PMUVer_IMP_DEF
+	ccmp	x1, #ID_AA64DFR0_EL1_PMUVer_V3P9, #8, ne
+	b.lt	.Lskip_pmuv3p9_\@		// Skip if < PMUv3p9 or IMP_DEF
 
 	orr	x0, x0, #HDFGRTR2_EL2_nPMICNTR_EL0
 	orr	x0, x0, #HDFGRTR2_EL2_nPMICFILTR_EL0

base-commit: 72d3fcf802c45d00b300f25b848a93c3a2bd7c7e
-- 
2.39.5