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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D5CBC433FE for ; Thu, 18 Nov 2021 10:46:23 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 1B09861B29 for ; Thu, 18 Nov 2021 10:46:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 1B09861B29 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org 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:References:In-Reply-To: Subject:Cc:To:From:Message-ID:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=A7z8AzqFagShIIb4F7+Tdjptpc3Yv55FyEcr8qdvTb8=; b=JBRmGibUaLthf9 s5h2pgogZ3gCSe44i/oG89z/Ym/5hvWcoYwbg5f97DdmxMxI1klSUhzye4CfQ1pvnNSgB5WzDVOj8 6nxd3actsPMOhiIugX5aSKJ4/u9NOcGZEdhRVFkRPFvKflvrFmEzLxiWNZ0aPuUOal0Aw28tHihot O3ApUk5amZZEeI1Dw2wkTqYcgwxFEvT0AmuWyxpBTkoP+UIxDh+GvduzSEGn4XeDFJR1MMTWe2YlF hWbhQnoSRySMkquvQ6VAANYj2pAWRID8VESpA/EDygf+Gqd5R5Z+4gZFlvZPcmHYpM29ZOsRVCQUq hgg1imjVSK3a1WEDxMpQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1mneuk-007Tpk-Mi; Thu, 18 Nov 2021 10:45:10 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1mneuh-007Toz-Jq for linux-arm-kernel@lists.infradead.org; Thu, 18 Nov 2021 10:45:08 +0000 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (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 1D83C61AA3; Thu, 18 Nov 2021 10:45:07 +0000 (UTC) Received: from sofa.misterjones.org ([185.219.108.64] helo=why.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mneue-006I7g-UW; Thu, 18 Nov 2021 10:45:05 +0000 Date: Thu, 18 Nov 2021 10:45:04 +0000 Message-ID: <87lf1l7nf3.wl-maz@kernel.org> From: Marc Zyngier To: Pali =?UTF-8?B?Um9ow6Fy?= Cc: Bjorn Helgaas , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, kernel-team@android.com, Alyssa Rosenzweig , Lorenzo Pieralisi , Bjorn Helgaas Subject: Re: [PATCH] PCI: apple: Reset the port for 100ms on probe In-Reply-To: <87o86h7pex.wl-maz@kernel.org> References: <20211117160053.232158-1-maz@kernel.org> <20211117201245.GA1768803@bhelgaas> <20211117202859.2m5sqwz6xsjgldji@pali> <87o86h7pex.wl-maz@kernel.org> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/27.1 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: pali@kernel.org, helgaas@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, kernel-team@android.com, alyssa@rosenzweig.io, lorenzo.pieralisi@arm.com, bhelgaas@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211118_024507_697912_483EC344 X-CRM114-Status: GOOD ( 13.35 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 18 Nov 2021 10:01:58 +0000, Marc Zyngier wrote: > > There is also a third delay (Tperst-clk) which represents the time > required for the clock to ramp up before releasing #PERST. No, there > is no value associated with this. Actually, there is. At least the PCIe CMS r2.0 (2.6.2. AC Specifications) does provide a table of the timings. Tperst-clk has a minimum value of 100us. Which means I can tighten things further. M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel