From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BC0FAC433E0 for ; Sun, 14 Mar 2021 16:41:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8894164EC6 for ; Sun, 14 Mar 2021 16:41:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233977AbhCNQkm (ORCPT ); Sun, 14 Mar 2021 12:40:42 -0400 Received: from muru.com ([72.249.23.125]:43104 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233369AbhCNQkP (ORCPT ); Sun, 14 Mar 2021 12:40:15 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id C927F80B4; Sun, 14 Mar 2021 16:40:56 +0000 (UTC) From: Tony Lindgren To: linux-omap@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Carlos Leija , Praneeth Bajjuri , Bryan Buckley , Tero Kristo , Carl Philipp Klemm , Merlijn Wajer , Ivan Jelincic , Pavel Machek , Sebastian Reichel , Tero Kristo Subject: [PATCH] ARM: OMAP4: PM: update ROM return address for OSWR and OFF Date: Sun, 14 Mar 2021 18:39:43 +0200 Message-Id: <20210314163943.6252-1-tony@atomide.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org From: Carlos Leija We need to add a dummy smc call to the cpuidle wakeup path to force the ROM code to save the return address after MMU is enabled again. This is needed to prevent random hangs on secure devices like droid4. Otherwise the system will eventually hang when entering deeper SoC idle states with the core and mpu domains in open-switch retention (OSWR). The hang happens as the ROM code tries to use the earlier physical return address set by omap-headsmp.S with MMU off while waking up CPU1 again. The hangs started happening in theory already with commit caf8c87d7ff2 ("ARM: OMAP2+: Allow core oswr for omap4"), but in practise the issue went unnoticed as various drivers were often blocking any deeper idle states with hardware autoidle features. This patch is based on an earlier TI Linux kernel tree commit 92f0b3028d9e ("OMAP4: PM: update ROM return address for OSWR and OFF") written by Carlos Leija , Praneeth Bajjuri , and Bryan Buckley . A later version of the patch was updated to use CPU_PM notifiers by Tero Kristo . Signed-off-by: Carlos Leija Signed-off-by: Praneeth Bajjuri Signed-off-by: Bryan Buckley Signed-off-by: Tero Kristo Fixes: caf8c87d7ff2 ("ARM: OMAP2+: Allow core oswr for omap4") Reported-by: Carl Philipp Klemm Reported-by: Merlijn Wajer Cc: Ivan Jelincic Cc: Pavel Machek Cc: Sebastian Reichel Cc: Tero Kristo [tony@atomide.com: updated to apply, updated description] Signed-off-by: Tony Lindgren --- arch/arm/mach-omap2/omap-secure.c | 39 +++++++++++++++++++++++++++++++ arch/arm/mach-omap2/omap-secure.h | 1 + 2 files changed, 40 insertions(+) diff --git a/arch/arm/mach-omap2/omap-secure.c b/arch/arm/mach-omap2/omap-secure.c --- a/arch/arm/mach-omap2/omap-secure.c +++ b/arch/arm/mach-omap2/omap-secure.c @@ -9,6 +9,7 @@ */ #include +#include #include #include #include @@ -20,6 +21,7 @@ #include "common.h" #include "omap-secure.h" +#include "soc.h" static phys_addr_t omap_secure_memblock_base; @@ -213,3 +215,40 @@ void __init omap_secure_init(void) { omap_optee_init_check(); } + +/* + * Dummy dispatcher call after core OSWR and MPU off. Updates the ROM return + * address after MMU has been re-enabled after CPU1 has been woken up again. + * Otherwise the ROM code will attempt to use the earlier physical return + * address that got set with MMU off when waking up CPU1. Only used on secure + * devices. + */ +static int cpu_notifier(struct notifier_block *nb, unsigned long cmd, void *v) +{ + switch (cmd) { + case CPU_CLUSTER_PM_EXIT: + omap_secure_dispatcher(OMAP4_PPA_SERVICE_0, + FLAG_START_CRITICAL, + 0, 0, 0, 0, 0); + break; + default: + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block secure_notifier_block = { + .notifier_call = cpu_notifier, +}; + +static int __init secure_pm_init(void) +{ + if (omap_type() == OMAP2_DEVICE_TYPE_GP) + return 0; + + cpu_pm_register_notifier(&secure_notifier_block); + + return 0; +} +omap_arch_initcall(secure_pm_init); diff --git a/arch/arm/mach-omap2/omap-secure.h b/arch/arm/mach-omap2/omap-secure.h --- a/arch/arm/mach-omap2/omap-secure.h +++ b/arch/arm/mach-omap2/omap-secure.h @@ -50,6 +50,7 @@ #define OMAP5_DRA7_MON_SET_ACR_INDEX 0x107 /* Secure PPA(Primary Protected Application) APIs */ +#define OMAP4_PPA_SERVICE_0 0x21 #define OMAP4_PPA_L2_POR_INDEX 0x23 #define OMAP4_PPA_CPU_ACTRL_SMP_INDEX 0x25 -- 2.30.2