linux-kernel - [PATCH 5.5 41/44] ARM: imx: Enable ARM_ERRATA

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Date:   Sat, 11 Apr 2020 14:10:01 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Anson Huang <Anson.Huang@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Christian Eggers <ceggers@...i.de>
Subject: [PATCH 5.5 41/44] ARM: imx: Enable ARM_ERRATA_814220 for i.MX6UL and i.MX7D

From: Anson Huang <Anson.Huang@....com>

commit 4562fa4c86c92a2df635fe0697c9e06379738741 upstream.

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@....com>
Signed-off-by: Shawn Guo <shawnguo@...nel.org>
Cc: Christian Eggers <ceggers@...i.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-imx/Kconfig |    2 ++
 1 file changed, 2 insertions(+)

--- 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.