From patchwork Tue Apr 16 13:29:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Thomas Richard X-Patchwork-Id: 13631866 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 D67FAC04FF9 for ; Tue, 16 Apr 2024 13:32:43 +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:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9WQDFCAFZnSeP2ZQ2imBLBVTbxzUJ5lQKzQMjw0AgnY=; b=LY+q4MZwLhg0Vx 5npy/e9/jBMwfOO3pqPz2SYx3AJCi2R/6R4PKunMMTwrHmGgtLYCo/70viahy+Tvnb6d2iuaskUUc Cdyfy9KrA/TB/0FAEhLePuRGr4lKuAPRrpedYaSPy/jKIQVS9Xh/xA4Z58lGNY8eCOpNM+ug8/j2N 3OMppV+a9bEIZCiB8PdVDheyxZqfbcUmoe5rtMg0OSDV3jPHbMopb3qc2A/ACh2SvVb7VbB5V/5ww QiblsxIkmmPINjohU5BqGeu75NKvnPVw2i+HeU7CGaN3KtX4lXoGytReo7nJMmMmRWNVcSy33Beor +in3AYtxxApVzDwGCXqw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rwivA-0000000CKRU-3eAH; Tue, 16 Apr 2024 13:32:24 +0000 Received: from relay2-d.mail.gandi.net ([2001:4b98:dc4:8::222]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rwitH-0000000CJLC-3LSS for linux-arm-kernel@lists.infradead.org; Tue, 16 Apr 2024 13:30:33 +0000 Received: by mail.gandi.net (Postfix) with ESMTPSA id 89DAA40007; Tue, 16 Apr 2024 13:30:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bootlin.com; s=gm1; t=1713274226; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=SOtYByFbOq/kD+SHjuSXQZVzJTtVnLBLPoL8nOih1ao=; b=UVoXazS64pUJ2dqd9Efwu8fZrPjLcY9GpSxAvev1gs9Hgos2iof1LFsA+ZhzfJE+UXyn0/ +1Jvy5CC2vbg9ToO/ekDRTZVWDnrxnGFoWvtvLmfvnSkhJKkK8THhbvPswiWmF3XMfOag/ MiMp9dhJb4gw0HVPYxA5f3b1Lu2rv2a39PVKsBcURzPKiOZp9MtAv+z5jZGOBZVJoH+vu0 KoQxtte/MO2O/yqxhATTXLX3lVzuO4JBePHkrzgK9Ve7GQvB+8NXW/J5nL8cg3Pr/wgBiP tv8c+DseqNoXJmmMgeL06ksnSoRz0uK2zrpb+ecLqstSeZUurC0zxbOW4/nRhg== From: Thomas Richard Date: Tue, 16 Apr 2024 15:29:58 +0200 Subject: [PATCH v5 09/11] PCI: Add T_PERST_CLK_US macro MIME-Version: 1.0 Message-Id: <20240102-j7200-pcie-s2r-v5-9-4b8c46711ded@bootlin.com> References: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@bootlin.com> In-Reply-To: <20240102-j7200-pcie-s2r-v5-0-4b8c46711ded@bootlin.com> To: Linus Walleij , Bartosz Golaszewski , Tony Lindgren , Aaro Koskinen , Janusz Krzysztofik , Vignesh R , Andi Shyti , Peter Rosin , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy?= =?utf-8?q?=C5=84ski?= , Rob Herring , Bjorn Helgaas , Siddharth Vadapalli Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-i2c@vger.kernel.org, linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org, gregory.clement@bootlin.com, theo.lebrun@bootlin.com, thomas.petazzoni@bootlin.com, u-kumar1@ti.com, Thomas Richard X-Mailer: b4 0.12.0 X-GND-Sasl: thomas.richard@bootlin.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240416_063028_811681_16E92895 X-CRM114-Status: UNSURE ( 8.85 ) X-CRM114-Notice: Please train this message. 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 "Power Sequencing and Reset Signal Timings" table (section 2.9.2) in PCI EXPRESS CARD ELECTROMECHANICAL SPECIFICATION, REV. 5.1 indicates PERST# should be deasserted after minimum of 100us once REFCLK is stable (symbol T_PERST-CLK). Add a macro so that PCIe controller drivers can use it. Signed-off-by: Thomas Richard --- drivers/pci/pci.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 17fed1846847..c47b1d3b5887 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -16,6 +16,9 @@ /* Power stable to PERST# inactive from PCIe card Electromechanical Spec */ #define PCIE_T_PVPERL_MS 100 +/* REFCLK stable before PERST# inactive from PCIe card Electromechanical Spec */ +#define PCIE_T_PERST_CLK_US 100 + /* * PCIe r6.0, sec 5.3.3.2.1 * Recommends 1ms to 10ms timeout to check L2 ready.