diff options
| author |   Doug Anderson <armlinux@m.disordat.com> | 2019-04-26 23:35:46 +0100 |
|---|---|---|
| committer |   Russell King <rmk+kernel@armlinux.org.uk> | 2019-06-20 22:29:55 +0100 |
| commit | 304009a182b9fc6eff74060b415c8240380501cb (patch) | |
| tree | fe9743b44dfbd5907a9a614151bfaf776946a5c6 /arch | |
| parent | ARM: 8860/1: VDSO: Drop implicit common-page-size linker flag (diff) | |
| download | linux-dev-304009a182b9fc6eff74060b415c8240380501cb.tar.xz linux-dev-304009a182b9fc6eff74060b415c8240380501cb.zip | |
ARM: 8861/1: errata: Workaround errata A12 857271 / A17 857272
This adds support for working around errata A12 857271 / A17 857272.
These errata were causing hangs on rk3288-based Chromebooks and it was
confirmed that this workaround fixed the problems. In the Chrome OS
3.14 kernel this was treated as two errata: ERRATA_FOOBAR [1] and
ERRATA_CR711784 [2]. Apparently the two errata got lumped together at
some point in time.
Let's actually get the workaround landed.
[1] https://crrev.com/c/342753
[2] https://crbug.com/711784
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/Kconfig | 18 | ||||
| -rw-r--r-- | arch/arm/mm/proc-v7.S | 10 |
2 files changed, 28 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 8869742a85df..96377e3cd3d8 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1175,6 +1175,14 @@ config ARM_ERRATA_825619 DMB NSHST or DMB ISHST instruction followed by a mix of Cacheable and Device/Strongly-Ordered loads and stores might cause deadlock +config ARM_ERRATA_857271 + bool "ARM errata: A12: CPU might deadlock under some very rare internal conditions" + depends on CPU_V7 + help + This option enables the workaround for the 857271 Cortex-A12 + (all revs) erratum. Under very rare timing conditions, the CPU might + hang. The workaround is expected to have a < 1% performance impact. + config ARM_ERRATA_852421 bool "ARM errata: A17: DMB ST might fail to create order between stores" depends on CPU_V7 @@ -1196,6 +1204,16 @@ config ARM_ERRATA_852423 config option from the A12 erratum due to the way errata are checked for and handled. +config ARM_ERRATA_857272 + bool "ARM errata: A17: CPU might deadlock under some very rare internal conditions" + depends on CPU_V7 + help + This option enables the workaround for the 857272 Cortex-A17 erratum. + This erratum is not known to be fixed in any A17 revision. + This is identical to Cortex-A12 erratum 857271. It is a separate + config option from the A12 erratum due to the way errata are checked + for and handled. + endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index 339eb17c9808..2966086d8a45 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -392,6 +392,11 @@ __ca12_errata: orr r10, r10, #1 << 24 @ set bit #24 mcr p15, 0, r10, c15, c0, 1 @ write diagnostic register #endif +#ifdef CONFIG_ARM_ERRATA_857271 + mrc p15, 0, r10, c15, c0, 1 @ read diagnostic register + orr r10, r10, #3 << 10 @ set bits #10 and #11 + mcr p15, 0, r10, c15, c0, 1 @ write diagnostic register +#endif b __errata_finish __ca17_errata: @@ -407,6 +412,11 @@ __ca17_errata: orrle r10, r10, #1 << 12 @ set bit #12 mcrle p15, 0, r10, c15, c0, 1 @ write diagnostic register #endif +#ifdef CONFIG_ARM_ERRATA_857272 + mrc p15, 0, r10, c15, c0, 1 @ read diagnostic register + orr r10, r10, #3 << 10 @ set bits #10 and #11 + mcr p15, 0, r10, c15, c0, 1 @ write diagnostic register +#endif b __errata_finish __v7_pj4b_setup: |