From patchwork Thu May 20 09:18:21 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 12269607 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=-19.1 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 B8466C4360C for ; Thu, 20 May 2021 09:47:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9ADE5619BE for ; Thu, 20 May 2021 09:47:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233907AbhETJso (ORCPT ); Thu, 20 May 2021 05:48:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:47800 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233837AbhETJqj (ORCPT ); Thu, 20 May 2021 05:46:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id DC6066145E; Thu, 20 May 2021 09:34:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503241; bh=Wo6UJarYlLD4jwMqh8qhs8BVvvgDb70kH13z56ZTjSs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GaByykTeHiZYlHPkiccpIonW0169TL1fBk83RA1rAT4Kd9fyl6i549v3m/yunU1/D JYBEVTbSpfkGI86qsgFVxczotIXjrlwKg0T6cPjkBsj/TGlZM/vhhZ8U5bwQCckvV0 tWG5YCDoEYARdTtHgdTNsIy++gSvQ00vyEih3mmU= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ilya Lipnitskiy , John Crispin , linux-mips@vger.kernel.org, linux-mediatek@lists.infradead.org, Thomas Bogendoerfer Subject: [PATCH 4.19 132/425] MIPS: pci-mt7620: fix PLL lock check Date: Thu, 20 May 2021 11:18:21 +0200 Message-Id: <20210520092135.771895768@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092131.308959589@linuxfoundation.org> References: <20210520092131.308959589@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org From: Ilya Lipnitskiy commit c15b99ae2ba9ea30da3c7cd4765b8a4707e530a6 upstream. Upstream a long-standing OpenWrt patch [0] that fixes MT7620 PCIe PLL lock check. The existing code checks the wrong register bit: PPLL_SW_SET is not defined in PPLL_CFG1 and bit 31 of PPLL_CFG1 is marked as reserved in the MT7620 Programming Guide. The correct bit to check for PLL lock is PPLL_LD (bit 23). Also reword the error message for clarity. Without this change it is unlikely that this driver ever worked with mainline kernel. [0]: https://lists.infradead.org/pipermail/lede-commits/2017-July/004441.html Signed-off-by: Ilya Lipnitskiy Cc: John Crispin Cc: linux-mips@vger.kernel.org Cc: linux-mediatek@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: stable@vger.kernel.org Signed-off-by: Thomas Bogendoerfer Signed-off-by: Greg Kroah-Hartman --- arch/mips/pci/pci-mt7620.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) --- a/arch/mips/pci/pci-mt7620.c +++ b/arch/mips/pci/pci-mt7620.c @@ -33,6 +33,7 @@ #define RALINK_GPIOMODE 0x60 #define PPLL_CFG1 0x9c +#define PPLL_LD BIT(23) #define PPLL_DRV 0xa0 #define PDRV_SW_SET BIT(31) @@ -242,8 +243,8 @@ static int mt7620_pci_hw_init(struct pla rt_sysc_m32(0, RALINK_PCIE0_CLK_EN, RALINK_CLKCFG1); mdelay(100); - if (!(rt_sysc_r32(PPLL_CFG1) & PDRV_SW_SET)) { - dev_err(&pdev->dev, "MT7620 PPLL unlock\n"); + if (!(rt_sysc_r32(PPLL_CFG1) & PPLL_LD)) { + dev_err(&pdev->dev, "pcie PLL not locked, aborting init\n"); reset_control_assert(rstpcie0); rt_sysc_m32(RALINK_PCIE0_CLK_EN, 0, RALINK_CLKCFG1); return -1;