Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752110AbcLFL5b (ORCPT ); Tue, 6 Dec 2016 06:57:31 -0500 Received: from foss.arm.com ([217.140.101.70]:37036 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751437AbcLFL53 (ORCPT ); Tue, 6 Dec 2016 06:57:29 -0500 Date: Tue, 6 Dec 2016 11:54:57 +0000 From: Will Deacon To: Andy Gross Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux@armlinux.org.uk, jesper.nilsson@axis.com, lars.persson@axis.com, niklas.cassel@axis.com, heiko@sntech.de, Kevin Hilman , lorenzo.pieralisi@arm.com, ck.hu@mediatek.com, p.zabel@pengutronix.de, matthias.bgg@gmail.com, Srinivas Kandagatla , Bjorn Andersson , linux-mediatek@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-amlogic@lists.infradead.org Subject: Re: [PATCH 2/2] firmware: qcom: scm: Fix interrupted SCM calls Message-ID: <20161206115456.GC2498@arm.com> References: <1480405463-23165-1-git-send-email-andy.gross@linaro.org> <1480405463-23165-3-git-send-email-andy.gross@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1480405463-23165-3-git-send-email-andy.gross@linaro.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 882 Lines: 23 On Tue, Nov 29, 2016 at 01:44:23AM -0600, Andy Gross wrote: > This patch adds a Qualcomm specific quirk to the arm_smccc_smc call. > > On Qualcomm ARM64 platforms, the SMC call can return before it has > completed. If this occurs, the call can be restarted, but it requires > using the returned session ID value from the interrupted SMC call. > > The quirk stores off the session ID from the interrupted call in the > quirk structure so that it can be used by the caller. > > This patch folds in a fix given by Sricharan R: > https://lkml.org/lkml/2016/9/28/272 > > Signed-off-by: Andy Gross > --- > arch/arm64/kernel/smccc-call.S | 9 ++++++++- > drivers/firmware/qcom_scm-64.c | 11 +++++++++-- > include/linux/arm-smccc.h | 11 ++++++++--- > 3 files changed, 25 insertions(+), 6 deletions(-) Acked-by: Will Deacon Will