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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 8DC18C10F14 for ; Sun, 6 Oct 2019 18:00:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 67B6420673 for ; Sun, 6 Oct 2019 18:00:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570384831; bh=idS9ft4PoldZTWTcbysRgHOMFEngjStNMRW5fk1OU7E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Ak+0h4L37N7/3Kj+idaIukXD+KgETbPCawDhpvEu9c78ag5c4RtxOtbqPskCHPOoZ QaGOQ9gkyJQK7RkiEO10qDfOKLv/TvMORsdiM2nKpG/uqFVEBFAxSoDsW3d5w0M9na yE1PngdBoImKtmaD2L0ss9rZERSD12G2w1rBjhnU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728921AbfJFR3F (ORCPT ); Sun, 6 Oct 2019 13:29:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:54662 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728891AbfJFR26 (ORCPT ); Sun, 6 Oct 2019 13:28:58 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 96F142133F; Sun, 6 Oct 2019 17:28:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570382938; bh=idS9ft4PoldZTWTcbysRgHOMFEngjStNMRW5fk1OU7E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AOV68vEKcLTD1B9pCw8xQBlpnMhaHUg+lSXi25bJBXH1fHmudYkjynmc3m2O3EjT2 jfQ3O7np+FqYwJmEGliiH9YS0E3wKtOoup6s/eW0E5FCNszresX4X3aVVfark5JHEW MmNKnX8pjxl1DbJZsusX8l0duDo6sDWJIdtGW79E= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Thierry Reding , Dmitry Osipenko , Sowjanya Komatineni , Linus Walleij , Sasha Levin Subject: [PATCH 4.19 026/106] pinctrl: tegra: Fix write barrier placement in pmx_writel Date: Sun, 6 Oct 2019 19:20:32 +0200 Message-Id: <20191006171137.992118437@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191006171124.641144086@linuxfoundation.org> References: <20191006171124.641144086@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sowjanya Komatineni [ Upstream commit c2cf351eba2ff6002ce8eb178452219d2521e38e ] pmx_writel uses writel which inserts write barrier before the register write. This patch has fix to replace writel with writel_relaxed followed by a readback and memory barrier to ensure write operation is completed for successful pinctrl change. Acked-by: Thierry Reding Reviewed-by: Dmitry Osipenko Signed-off-by: Sowjanya Komatineni Link: https://lore.kernel.org/r/1565984527-5272-2-git-send-email-skomatineni@nvidia.com Signed-off-by: Linus Walleij Signed-off-by: Sasha Levin --- drivers/pinctrl/tegra/pinctrl-tegra.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/tegra/pinctrl-tegra.c b/drivers/pinctrl/tegra/pinctrl-tegra.c index 1aba75897d147..26a3f1eb9c6bf 100644 --- a/drivers/pinctrl/tegra/pinctrl-tegra.c +++ b/drivers/pinctrl/tegra/pinctrl-tegra.c @@ -40,7 +40,9 @@ static inline u32 pmx_readl(struct tegra_pmx *pmx, u32 bank, u32 reg) static inline void pmx_writel(struct tegra_pmx *pmx, u32 val, u32 bank, u32 reg) { - writel(val, pmx->regs[bank] + reg); + writel_relaxed(val, pmx->regs[bank] + reg); + /* make sure pinmux register write completed */ + pmx_readl(pmx, bank, reg); } static int tegra_pinctrl_get_groups_count(struct pinctrl_dev *pctldev) -- 2.20.1