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 5119BC4452B for ; Tue, 21 Jul 2026 20:28:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To: Content-Transfer-Encoding:Content-Type:MIME-Version:References:Message-ID: Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=gznV+LB15vmhWoRTlpGEHarjonWqGIox8XJlDCHDZK8=; b=jQv+Ph9AuN6tH1zJv+PC7Q1mcg BrH8AChFRyONKgSa3rP1MmCZs6oCAEzeEs6bhStpBT6Afc0/qbXGPRSdCJ9qO5FgvUoXINmLVTjRV /Koy8abon7oPbC+7YwAvNbtCrNinoQFhCJmOpBOUTn7WiqZCfgr+XsLTu69zor3VbiYPcOlUchdtk HB3pfTXe6bDficSYeETpGqivmpMyK0u/7+ECkQzaANpYOKQcdb7YjBresk9skGXS62dbeqOYqu435 E2Yf0EMejOGULN/AXBLm14Y7hocdGk6zuS+WcH+fzZrZ52cKyKs8MRA84js3FmEJfXGvY0G/pjvao f42tdy2g==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmH4y-0000000ANfM-03av; Tue, 21 Jul 2026 20:28:40 +0000 Received: from mgamail.intel.com ([192.198.163.17]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmH4w-0000000ANf0-1Q3u for linux-arm-kernel@lists.infradead.org; Tue, 21 Jul 2026 20:28:39 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1784665718; x=1816201718; h=date:from:to:cc:subject:message-id:references: mime-version:content-transfer-encoding:in-reply-to; bh=i41F0VtbH8eej0JjA+9cjDBrSagBe6HmsLGLINWNq1Y=; b=gUgXs4b4c8pdQs1WguH1fpH0VhZXdaDiuoKghmCnm+VAAHLPgG86we5e BuyPAa7obWmiUEO+7jRLfhUCXlSvjfeG1ekn8T1UTGh66x3hn2jt8ASwf +FA9h+jWjImBjGkjTHSmgDEtdQA3rqCXm3IaQBQly1vlAiwCXnjWpIxL2 j7xprNA8AH9CCO4fwoJIDLrqnOvmY+kBeBPOVxOqsH2ZZBkDgBiXIQXsi sjeAS0SX8LO9xfaBZBNFZXbJ4EeXEV6Pl6nN2WFnJZGtGURxZpCdaR3d4 uJ8RuQQZ94ruA5vPMWG9Vy6GoyUS6ifxp9SLi3z0+2FRLcIrZ1GZeEqyB A==; X-CSE-ConnectionGUID: GMW5M2PqR8u59RJzDM1m/Q== X-CSE-MsgGUID: I3mfsrx2T4q4FEFDlcwdrA== X-IronPort-AV: E=McAfee;i="6800,10657,11853"; a="85157318" X-IronPort-AV: E=Sophos;i="6.25,177,1779174000"; d="scan'208";a="85157318" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa111.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jul 2026 13:28:35 -0700 X-CSE-ConnectionGUID: rvQzQn6cTiy66MrPIUEa/A== X-CSE-MsgGUID: H4YlEInCRuK03bLxzDbNyg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,177,1779174000"; d="scan'208";a="287898383" Received: from ncintean-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.245.67]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 21 Jul 2026 13:28:33 -0700 Date: Tue, 21 Jul 2026 23:28:29 +0300 From: Andy Shevchenko To: "Shih-Yuan Lee (FourDollars)" Cc: Mark Brown , Lukas Wunner , 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=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Organization: Intel Finland Oy - BIC 0357606-4 - c/o Alberga Business Park, 6 krs, Bertel Jungin Aukio 5, 02600 Espoo X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260721_132838_422351_8CCCEDBA X-CRM114-Status: GOOD ( 12.19 ) 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 Tue, Jul 21, 2026 at 11:26:27PM +0800, Shih-Yuan Lee (FourDollars) wrote: > On Tue, Jul 21, 2026 at 11:05 PM Mark Brown wrote: ... > Actually, I was just following Lukas's suggestion to modify > drivers/dma/dw/pci.c to do a quick proof-of-concept test, and I used > an AI assistant to help me write and deploy the driver quirk code. > > I have previous experience with the Initrd ACPI Table Override > mechanism, so I can definitely try that on my machine next to see if > we can get DMA working properly by aligning the PCI routing and DMAR > mapping correctly). > output. For old hardware (before Skylake) LPSS DMA interrupt line is defined in two places: DSDT (and/or PCI) and CSRT. Changing in one might not help as CSRT may have something different. Check drivers/dma/acpi-dma.c acpi_dma_parse_resource_group(). -- With Best Regards, Andy Shevchenko