From patchwork Wed Sep 15 06:50:32 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Lindgren X-Patchwork-Id: 512639 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=-16.7 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 0CB76C433EF for ; Wed, 15 Sep 2021 06:50:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E4F3560F8F for ; Wed, 15 Sep 2021 06:50:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231252AbhIOGv7 (ORCPT ); Wed, 15 Sep 2021 02:51:59 -0400 Received: from muru.com ([72.249.23.125]:33112 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231195AbhIOGv7 (ORCPT ); Wed, 15 Sep 2021 02:51:59 -0400 Received: from hillo.muru.com (localhost [127.0.0.1]) by muru.com (Postfix) with ESMTP id 271D680C3; Wed, 15 Sep 2021 06:51:04 +0000 (UTC) From: Tony Lindgren To: linux-omap@vger.kernel.org Cc: Dave Gerlach , Faiz Abbas , Greg Kroah-Hartman , Grygorii Strashko , Keerthy , Nishanth Menon , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Suman Anna Subject: [PATCH] bus: ti-sysc: Fix external abort for am335x pruss probe Date: Wed, 15 Sep 2021 09:50:32 +0300 Message-Id: <20210915065032.45013-1-tony@atomide.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Starting with v5.15-rc1, I'm now seeing am335x beaglebone black produce the following error on pruss probe: Unhandled fault: external abort on non-linefetch (0x1008) at 0xe0326000 This seems to have started with the enabling of pruss for am335x in the dts files. Adding a read-back after write to the sysconfig register fixes the issue for me. Cc: Suman Anna Signed-off-by: Tony Lindgren --- drivers/bus/ti-sysc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c --- a/drivers/bus/ti-sysc.c +++ b/drivers/bus/ti-sysc.c @@ -2037,6 +2037,9 @@ static int sysc_reset(struct sysc *ddata) sysc_val = sysc_read_sysconfig(ddata); sysc_val |= sysc_mask; sysc_write(ddata, sysc_offset, sysc_val); + + /* Flush posted write */ + sysc_read_sysconfig(ddata); } if (ddata->cfg.srst_udelay)