linux-kernel - [PATCH AUTOSEL for 4.15 049/189] MIPS: JZ4770: Work around config2 misreporting associativity

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Message-ID: <20180409001637.162453-49-alexander.levin@microsoft.com>
Date:   Mon, 9 Apr 2018 00:17:24 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Maarten ter Huurne <maarten@...ewalker.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
        James Hogan <jhogan@...nel.org>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.15 049/189] MIPS: JZ4770: Work around config2
 misreporting associativity

From: Maarten ter Huurne <maarten@...ewalker.org>

[ Upstream commit 1f7412e0e2f327fe7dc5a0c2fc36d7b319d05d47 ]

According to config2, the associativity would be 5-ways, but the
documentation states 4-ways, which also matches the documented
L2 cache size of 256 kB.

Signed-off-by: Maarten ter Huurne <maarten@...ewalker.org>
Reviewed-by: James Hogan <jhogan@...nel.org>
Cc: Ralf Baechle <ralf@...ux-mips.org>
Cc: linux-mips@...ux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18488/
Signed-off-by: James Hogan <jhogan@...nel.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 arch/mips/mm/sc-mips.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/mips/mm/sc-mips.c b/arch/mips/mm/sc-mips.c
index 548acb7f8557..394673991bab 100644
--- a/arch/mips/mm/sc-mips.c
+++ b/arch/mips/mm/sc-mips.c
@@ -16,6 +16,7 @@
 #include <asm/mmu_context.h>
 #include <asm/r4kcache.h>
 #include <asm/mips-cps.h>
+#include <asm/bootinfo.h>
 
 /*
  * MIPS32/MIPS64 L2 cache handling
@@ -220,6 +221,14 @@ static inline int __init mips_sc_probe(void)
 	else
 		return 0;
 
+	/*
+	 * According to config2 it would be 5-ways, but that is contradicted
+	 * by all documentation.
+	 */
+	if (current_cpu_type() == CPU_JZRISC &&
+				mips_machtype == MACH_INGENIC_JZ4770)
+		c->scache.ways = 4;
+
 	c->scache.waysize = c->scache.sets * c->scache.linesz;
 	c->scache.waybit = __ffs(c->scache.waysize);
 
-- 
2.15.1