From patchwork Thu Mar 24 07:25:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?Smlhbmp1biBXYW5nICjnjovlu7rlhpsp?= X-Patchwork-Id: 12790491 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3676BC433EF for ; Thu, 24 Mar 2022 07:37:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=HU0KYs9l401PzOsqKnVxBuqgX4z//nVezuKVZyzjmY8=; b=cBOY1a/9CwW30F XNQoZcPBR1Zv5rhO3pkHU3UV/3akAUw0BFIJyxB3vQtCDcp9mZVIeO2quti7l7pERm3cAgGKV1fR9 iRQ2L2EtixwTbZNiHGh/OwEbwq/gjYL43A9J9N2AE6ghk6h0gydU0vx4MoW63DJs92lI23AOQ/m5s Ia0QBl49HTByTa/ztket02+yIWz/zJXWduLx8y3a6xuvchHL/GKMT/Tt8LicEn7qhuvEpXOJWyxY8 1Znxe2h+mTLGNfRUcrCuJg+DQzxT0mwgVpTg2VZfRM0lYIhmCV1Llvweq7XV/dpAgXufprjgZOM6A j4N+EuQDGvO8igEGKPag==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nXI15-00FxMj-Cn; Thu, 24 Mar 2022 07:36:19 +0000 Received: from mailgw02.mediatek.com ([216.200.240.185]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nXI10-00FxLy-Mk; Thu, 24 Mar 2022 07:36:17 +0000 X-UUID: 2a94006c9e5a499183df22b7ea7466de-20220324 X-UUID: 2a94006c9e5a499183df22b7ea7466de-20220324 Received: from mtkcas66.mediatek.inc [(172.29.193.44)] by mailgw02.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 1369683219; Thu, 24 Mar 2022 00:36:10 -0700 Received: from mtkexhb02.mediatek.inc (172.21.101.103) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 24 Mar 2022 00:26:07 -0700 Received: from mtkcas10.mediatek.inc (172.21.101.39) by mtkexhb02.mediatek.inc (172.21.101.103) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 24 Mar 2022 15:25:54 +0800 Received: from localhost.localdomain (10.17.3.154) by mtkcas10.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 24 Mar 2022 15:25:53 +0800 From: Jianjun Wang To: Ryder Lee , Lorenzo Pieralisi , Bjorn Helgaas CC: Jianjun Wang , Rob Herring , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Matthias Brugger , , , , , , , , Subject: [PATCH] PCI: mediatek-gen3: Print LTSSM state when PCIe link down Date: Thu, 24 Mar 2022 15:25:48 +0800 Message-ID: <20220324072548.11408-1-jianjun.wang@mediatek.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220324_003614_758528_D1146966 X-CRM114-Status: GOOD ( 12.09 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Print current LTSSM state when PCIe link down instead of the register value, make it easier to get the link status. Signed-off-by: Jianjun Wang Reviewed-by: AngeloGioacchino Del Regno --- drivers/pci/controller/pcie-mediatek-gen3.c | 40 ++++++++++++++++++++- 1 file changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c index 7705d61fba4c..54663f025e27 100644 --- a/drivers/pci/controller/pcie-mediatek-gen3.c +++ b/drivers/pci/controller/pcie-mediatek-gen3.c @@ -153,6 +153,37 @@ struct mtk_gen3_pcie { DECLARE_BITMAP(msi_irq_in_use, PCIE_MSI_IRQS_NUM); }; +/* LTSSM state in PCIE_LTSSM_STATUS_REG bit[28:24] */ +static const char *const ltssm_str[] = { + "detect.quiet", /* 0x00 */ + "detect.active", /* 0x01 */ + "polling.active", /* 0x02 */ + "polling.compliance", /* 0x03 */ + "polling.configuration", /* 0x04 */ + "config.linkwidthstart", /* 0x05 */ + "config.linkwidthaccept", /* 0x06 */ + "config.lanenumwait", /* 0x07 */ + "config.lanenumaccept", /* 0x08 */ + "config.complete", /* 0x09 */ + "config.idle", /* 0x0A */ + "recovery.receiverlock", /* 0x0B */ + "recovery.equalization", /* 0x0C */ + "recovery.speed", /* 0x0D */ + "recovery.receiverconfig", /* 0x0E */ + "recovery.idle", /* 0x0F */ + "L0", /* 0x10 */ + "L0s", /* 0x11 */ + "L1.entry", /* 0x12 */ + "L1.idle", /* 0x13 */ + "L2.idle", /* 0x14 */ + "L2.transmitwake", /* 0x15 */ + "disable", /* 0x16 */ + "loopback.entry", /* 0x17 */ + "loopback.active", /* 0x18 */ + "loopback.exit", /* 0x19 */ + "hotreset", /* 0x1A */ +}; + /** * mtk_pcie_config_tlp_header() - Configure a configuration TLP header * @bus: PCI bus to query @@ -327,8 +358,15 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie) !!(val & PCIE_PORT_LINKUP), 20, PCI_PM_D3COLD_WAIT * USEC_PER_MSEC); if (err) { + const char *ltssm_state; + int ltssm_index; + val = readl_relaxed(pcie->base + PCIE_LTSSM_STATUS_REG); - dev_err(pcie->dev, "PCIe link down, ltssm reg val: %#x\n", val); + ltssm_index = PCIE_LTSSM_STATE(val); + ltssm_state = ltssm_index >= ARRAY_SIZE(ltssm_str) ? + "Unknown state" : ltssm_str[ltssm_index]; + dev_err(pcie->dev, "PCIe link down, current ltssm state: %s\n", + ltssm_state); return err; }