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| author | Linus Walleij <linus.walleij@linaro.org> | 2016-03-09 17:40:37 +0700 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2016-03-09 17:40:37 +0700 |
| commit | 0bae2f17323a4630c487a9b77c37bebf407424af (patch) | |
| tree | fc1f71a0209ec61841a5acb65d59d147af3cc4fa /arch/arm64/kernel/head.S | |
| parent | adf32eaa05323449b74b36f25b918583e2bdb6f1 (diff) | |
| parent | ca801a22f465eae39fadc770e15b5b7e82595f81 (diff) | |
Merge branch 'ib-mfd-regulator-gpio-4.6' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/mfd into devel
Diffstat (limited to 'arch/arm64/kernel/head.S')
| -rw-r--r-- | arch/arm64/kernel/head.S | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S index ffe9c2b6431b..917d98108b3f 100644 --- a/arch/arm64/kernel/head.S +++ b/arch/arm64/kernel/head.S @@ -514,9 +514,14 @@ CPU_LE( movk x0, #0x30d0, lsl #16 ) // Clear EE and E0E on LE systems #endif /* EL2 debug */ + mrs x0, id_aa64dfr0_el1 // Check ID_AA64DFR0_EL1 PMUVer + sbfx x0, x0, #8, #4 + cmp x0, #1 + b.lt 4f // Skip if no PMU present mrs x0, pmcr_el0 // Disable debug access traps ubfx x0, x0, #11, #5 // to EL2 and allow access to msr mdcr_el2, x0 // all PMU counters from EL1 +4: /* Stage-2 translation */ msr vttbr_el2, xzr |