Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932384AbaJNNtH (ORCPT ); Tue, 14 Oct 2014 09:49:07 -0400 Received: from smtp.codeaurora.org ([198.145.11.231]:39812 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932147AbaJNNtE (ORCPT ); Tue, 14 Oct 2014 09:49:04 -0400 From: Stephen Boyd To: Russell King Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Will Deacon , Rob Clark Subject: [PATCH v2 1/3] ARM: vfp: Workaround bad MVFR1 register on some Kraits Date: Tue, 14 Oct 2014 06:48:57 -0700 Message-Id: <1413294539-22069-2-git-send-email-sboyd@codeaurora.org> X-Mailer: git-send-email 2.1.0.61.ge50deb1 In-Reply-To: <1413294539-22069-1-git-send-email-sboyd@codeaurora.org> References: <1413294539-22069-1-git-send-email-sboyd@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Certain versions of the Krait processor don't report that they support the fused multiply accumulate instruction via the MVFR1 register despite the fact that they actually do. Unfortunately we use this register to identify support for VFPv4. Override the hwcap on all Krait processors to indicate support for VFPv4 to workaround this. Signed-off-by: Stephen Boyd --- arch/arm/mm/proc-v7.S | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S index b5d67db20897..2e78b4b2538f 100644 --- a/arch/arm/mm/proc-v7.S +++ b/arch/arm/mm/proc-v7.S @@ -593,9 +593,10 @@ __krait_proc_info: /* * Some Krait processors don't indicate support for SDIV and UDIV * instructions in the ARM instruction set, even though they actually - * do support them. + * do support them. They also don't indicate support for fused multiply + * instructions even though they actually do support them. */ - __v7_proc __v7_setup, hwcaps = HWCAP_IDIV + __v7_proc __v7_setup, hwcaps = HWCAP_IDIV | HWCAP_VFPv4 .size __krait_proc_info, . - __krait_proc_info /* -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/