linux-kernel - [PATCH] ARM: drop ISAR0 workaround for B15

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Date:	Wed, 13 Aug 2014 12:40:47 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Gregory Fong <gregory.0xf0@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Russell King <linux@....linux.org.uk>,
	Will Deacon <will.deacon@....com>,
	Matt Porter <mporter@...aro.org>,
	Christian Daudt <bcm@...thebug.org>,
	Mark Rutland <mark.rutland@....com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Marc Carino <marc.ceeeee@...il.com>,
	Kevin Cernekee <cernekee@...il.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM: drop ISAR0 workaround for B15

The Brahma-B15's ISAR0 correcty advertises UDIV/SDIV support in both ARM
and Thumb2 modes (CPUID_EXT_ISAR0=02101110), so we don't need to
manually apply this hwcap.

The code in question actually predates the following commit, which made
our hwcaps unnecessary:

    commit 8164f7af88d9ad3a757bd14f634b23997ee77f6b
    Author: Stephen Boyd <sboyd@...eaurora.org>
    Date:   Mon Mar 18 19:44:15 2013 +0100

        ARM: 7680/1: Detect support for SDIV/UDIV from ISAR0 register

Signed-off-by: Brian Norris <computersforpeace@...il.com>
Cc: Will Deacon <will.deacon@....com>
Cc: Mark Rutland <mark.rutland@....com>
---
Supersedes Gregory's previous patch.

This addresses some very old review comments from Mark and Will:

  http://lists.infradead.org/pipermail/linux-arm-kernel/2014-January/225895.html
  http://lists.infradead.org/pipermail/linux-arm-kernel/2014-January/227916.html

 arch/arm/mm/proc-v7.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index b5d67db20897..b3a947863ac7 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -570,7 +570,7 @@ __v7_ca15mp_proc_info:
 __v7_b15mp_proc_info:
 	.long	0x420f00f0
 	.long	0xff0ffff0
-	__v7_proc __v7_b15mp_setup, hwcaps = HWCAP_IDIV
+	__v7_proc __v7_b15mp_setup
 	.size	__v7_b15mp_proc_info, . - __v7_b15mp_proc_info
 
 	/*
-- 
1.9.1
--
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