* [PATCH V2] ARM: imx: Enable ARM_ERRATA_814220 for i.MX6UL and i.MX7D
@ 2019-12-11 2:53 Anson Huang
2019-12-11 3:40 ` Shawn Guo
0 siblings, 1 reply; 2+ messages in thread
From: Anson Huang @ 2019-12-11 2:53 UTC (permalink / raw)
To: linux, shawnguo, s.hauer, kernel, festevam, tglx, gregkh,
linux-arm-kernel, linux-kernel
Cc: Linux-imx
ARM_ERRATA_814220 has below description:
The v7 ARM states that all cache and branch predictor maintenance
operations that do not specify an address execute, relative to
each other, in program order.
However, because of this erratum, an L2 set/way cache maintenance
operation can overtake an L1 set/way cache maintenance operation.
This ERRATA only affected the Cortex-A7 and present in r0p2, r0p3,
r0p4, r0p5.
i.MX6UL and i.MX7D have Cortex-A7 r0p5 inside, need to enable
ARM_ERRATA_814220 for proper workaround.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
---
Changes since V1:
- Add errata description and ARM core version in commit message.
---
arch/arm/mach-imx/Kconfig | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 593bf15..4326c8f 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -520,6 +520,7 @@ config SOC_IMX6UL
bool "i.MX6 UltraLite support"
select PINCTRL_IMX6UL
select SOC_IMX6
+ select ARM_ERRATA_814220
help
This enables support for Freescale i.MX6 UltraLite processor.
@@ -556,6 +557,7 @@ config SOC_IMX7D
select PINCTRL_IMX7D
select SOC_IMX7D_CA7 if ARCH_MULTI_V7
select SOC_IMX7D_CM4 if ARM_SINGLE_ARMV7M
+ select ARM_ERRATA_814220
help
This enables support for Freescale i.MX7 Dual processor.
--
2.7.4
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^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH V2] ARM: imx: Enable ARM_ERRATA_814220 for i.MX6UL and i.MX7D
2019-12-11 2:53 [PATCH V2] ARM: imx: Enable ARM_ERRATA_814220 for i.MX6UL and i.MX7D Anson Huang
@ 2019-12-11 3:40 ` Shawn Guo
0 siblings, 0 replies; 2+ messages in thread
From: Shawn Guo @ 2019-12-11 3:40 UTC (permalink / raw)
To: Anson Huang
Cc: gregkh, s.hauer, linux, linux-kernel, Linux-imx, kernel, tglx,
festevam, linux-arm-kernel
On Wed, Dec 11, 2019 at 10:53:36AM +0800, Anson Huang wrote:
> ARM_ERRATA_814220 has below description:
>
> The v7 ARM states that all cache and branch predictor maintenance
> operations that do not specify an address execute, relative to
> each other, in program order.
> However, because of this erratum, an L2 set/way cache maintenance
> operation can overtake an L1 set/way cache maintenance operation.
> This ERRATA only affected the Cortex-A7 and present in r0p2, r0p3,
> r0p4, r0p5.
>
> i.MX6UL and i.MX7D have Cortex-A7 r0p5 inside, need to enable
> ARM_ERRATA_814220 for proper workaround.
>
> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Applied, thanks.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
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