From patchwork Mon Mar 29 07:57:38 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 412617 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 916B6C433E0 for ; Mon, 29 Mar 2021 08:23:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70E6661927 for ; Mon, 29 Mar 2021 08:23:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233556AbhC2IXf (ORCPT ); Mon, 29 Mar 2021 04:23:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:39110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233731AbhC2IWQ (ORCPT ); Mon, 29 Mar 2021 04:22:16 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 33FC06044F; Mon, 29 Mar 2021 08:22:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617006125; bh=WNjIOSWreC0GQTlW1iRMYz47SgwQa5dd35GM4wDeaeg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Klfqmg/HkYDWkARCOR9Gobsd3Rj4e1cO5zb1bccIuDceWxlyzyQnTCodG7tNNBpnQ ilfgBJH+D3mqAP0pXf35eQVE+SuMTg0oWpVkdf1KiTmlRodzoMIfTs3mquaaXKorvU yQkI3bhn2BolosA6MI8TK4nT5Fqgt5vhRWaIbAQQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Angelo Dureghello , Marc Kleine-Budde , Sasha Levin Subject: [PATCH 5.10 127/221] can: flexcan: flexcan_chip_freeze(): fix chip freeze for missing bitrate Date: Mon, 29 Mar 2021 09:57:38 +0200 Message-Id: <20210329075633.441753261@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210329075629.172032742@linuxfoundation.org> References: <20210329075629.172032742@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Angelo Dureghello [ Upstream commit 47c5e474bc1e1061fb037d13b5000b38967eb070 ] For cases when flexcan is built-in, bitrate is still not set at registering. So flexcan_chip_freeze() generates: [ 1.860000] *** ZERO DIVIDE *** FORMAT=4 [ 1.860000] Current process id is 1 [ 1.860000] BAD KERNEL TRAP: 00000000 [ 1.860000] PC: [<402e70c8>] flexcan_chip_freeze+0x1a/0xa8 To allow chip freeze, using an hardcoded timeout when bitrate is still not set. Fixes: ec15e27cc890 ("can: flexcan: enable RX FIFO after FRZ/HALT valid") Link: https://lore.kernel.org/r/20210315231510.650593-1-angelo@kernel-space.org Signed-off-by: Angelo Dureghello [mkl: use if instead of ? operator] Signed-off-by: Marc Kleine-Budde Signed-off-by: Sasha Levin --- drivers/net/can/flexcan.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index d712c6fdbc87..7cbaac238ff6 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -658,9 +658,15 @@ static int flexcan_chip_disable(struct flexcan_priv *priv) static int flexcan_chip_freeze(struct flexcan_priv *priv) { struct flexcan_regs __iomem *regs = priv->regs; - unsigned int timeout = 1000 * 1000 * 10 / priv->can.bittiming.bitrate; + unsigned int timeout; + u32 bitrate = priv->can.bittiming.bitrate; u32 reg; + if (bitrate) + timeout = 1000 * 1000 * 10 / bitrate; + else + timeout = FLEXCAN_TIMEOUT_US / 10; + reg = priv->read(®s->mcr); reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT; priv->write(reg, ®s->mcr);