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 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 289EDC44539 for ; Wed, 22 Jul 2026 09:59:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=6SDsO25Rk7rGd75+RSY95wTDn5tS6ra/XRsVnBi1d1U=; b=HS5Zkrji5sff5ZhBijxX7k2YUl npS6rES3mGm1PXQ0U0bnReltLg606bcu95bGtp9X9WVk+7S7r7XSeVMIkc1mrs/heEGNpAeLqwKw7 npoO78CTYIcmaq3mLx+1eAsDgdv9VVRgOZCP/TAk/NzwpRY4j/KQbNbiCw48z5aN1lRxsWTUeNpBs bY/MtEz+0QrmoaWe+UNc6na3A9uzFR9o6rwYAuZdNw8sKm6weZHtT3bt45CIX+0cxGRy5/ZaARs1u p5Kv5aZB7UFSzxiYqqwsXvZdj1mAf08LtGwoGvzOqBSk2/s/PsqWFYE4Ipg5vuzov4Wy0fPirzg5+ PXooKJ1A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmTj6-0000000BTbU-1OFX; Wed, 22 Jul 2026 09:58:56 +0000 Received: from mailout2.hostsharing.net ([2a01:37:3000::53df:4ee9:0]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmTj2-0000000BTZU-2HQ7 for linux-arm-kernel@lists.infradead.org; Wed, 22 Jul 2026 09:58:55 +0000 Received: from h08.hostsharing.net (h08.hostsharing.net [IPv6:2a01:37:1000::53df:5f1c:0]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384 client-signature ECDSA (secp384r1) client-digest SHA384) (Client CN "*.hostsharing.net", Issuer "GlobalSign GCC R6 AlphaSSL CA 2025" (verified OK)) by mailout2.hostsharing.net (Postfix) with ESMTPS id 0AFC210611; Wed, 22 Jul 2026 11:58:44 +0200 (CEST) Received: by h08.hostsharing.net (Postfix, from userid 100393) id E9FB062749F4; Wed, 22 Jul 2026 11:58:43 +0200 (CEST) Date: Wed, 22 Jul 2026 11:58:43 +0200 From: Lukas Wunner To: "Shih-Yuan Lee (FourDollars)" Cc: Mark Brown , Andy Shevchenko , Mika Westerberg , Daniel Mack , Haojian Zhuang , Robert Jarzmik , linux-arm-kernel@lists.infradead.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v16 5/7] spi: pxa2xx: disable DMA for Apple MacBook8,1 Message-ID: References: <20260720162117.32304-1-fourdollars@debian.org> <20260720162117.32304-6-fourdollars@debian.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260722_025852_734770_8BD672D8 X-CRM114-Status: UNSURE ( 9.71 ) 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 On Wed, Jul 22, 2026 at 12:09:44AM +0800, Shih-Yuan Lee (FourDollars) wrote: > This confirms the root cause is not a software IRQ routing issue but > rather that the DMA controller's interrupt line is physically > non-functional on this motherboard. Like Andy says, the DMA controller is internal to the SkyLake-Y-ULX with SunrisePoint-PCH (Intel 100 Series Chipset), it's not something that needs to be connected on the mainboard. I've just looked through the Specification Update for Intel 100 Series Chipset and it doesn't list DMA-related errata. Hm... Lukas