From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0A69843F090; Thu, 1 Oct 2026 04:13:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.21 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790827993; cv=none; b=SgdwrmGoQ/4m5djPkONKqMDMosUy5wxu8RGceYlmSZQ68bqGwrKYZTVHNpsWdhP8XUoY/4GiFRxu5YRUcsSvum51kCimMjt9Ox8VkakfjGCUOWWWarnY84QCVWRTaeWvoG8HBoxjwpmW4+hJgnVRArsSM0JXDV5oREK2WlTJp9A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790827993; c=relaxed/simple; bh=0gAxlKmIA6K1VhObkwtDYhb08ccS4/II8Y1SYR8k3+s=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=cd/z9j8iaNJ9DwdMZ+FVwn7by6HSxwOfH47uKnsnZR0xvzFN9O4+KnPAnmZ6ZD5MtVRp7cOcL1yxsVVBehujxojZB3+EzProJZOjqGLnQBbiTH8pVHQjRwoPAEPvhGN0sF7AYuh4gkeV0CI7KXNs1B7kZSjeV4s19Ib0ktxUUKw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=linux.intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=I0mhHuxK; arc=none smtp.client-ip=198.175.65.21 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="I0mhHuxK" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1790827985; x=1822363985; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=0gAxlKmIA6K1VhObkwtDYhb08ccS4/II8Y1SYR8k3+s=; b=I0mhHuxKr8NjV//7+9ILkTwBjLwOlV6UOJUKXTzCwO5YBSzS0jzpX9PP LeMG/t4piXrpEsizyoNOrQfSIGP6yrGm2SU/HirOrg6XQ79txaFggOezT QCzutDPVcm0eecPxHP1ukdrD3BGkrGn0CeTKwmETZp9OU5OpbLyfPIhom MlA7tkZQFVWgjK713G0gCkBxic8tmyA7fsYWa60Gn85kdsvwFTZl9VUqB v2syl+IUhrysGT7ASnbpCv0+pYrkFSp66WXhpIxrq2LVE+xyLnszqH0uB qWRaV8naX1uLYkuAzxtc6ty1vfESE0eJdYYheMmiJ8ODMPCahQ4EV55To Q==; X-CSE-ConnectionGUID: +TeTIIghRi2bscvQ6rMGtw== X-CSE-MsgGUID: /5nBk55PS9ebXxwB8Kx93A== X-IronPort-AV: E=McAfee;i="6800,10657,11921"; a="90436460" X-IronPort-AV: E=Sophos;i="6.27,133,1787036400"; d="scan'208";a="90436460" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Sep 2026 21:13:05 -0700 X-CSE-ConnectionGUID: 75Xo4f+JTciNDNdQJjJe1Q== X-CSE-MsgGUID: tzhl8O0RTK+E2xq0gYHgsA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.27,133,1787036400"; d="scan'208";a="280629052" Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa004.fm.intel.com with ESMTP; 30 Sep 2026 21:13:02 -0700 Received: by black.igk.intel.com (Postfix, from userid 1001) id 3C1A299; Thu, 01 Oct 2026 06:13:01 +0200 (CEST) Date: Thu, 1 Oct 2026 06:13:01 +0200 From: Mika Westerberg To: Shih-Yuan Lee Cc: Mark Brown , Andy Shevchenko , Lukas Wunner , Daniel Mack , Haojian Zhuang , Robert Jarzmik , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v17 5/6] spi: pxa2xx-pci: restore LPSS private register state across S3 resume Message-ID: <20261001041301.GC176164@black.igk.intel.com> References: <20260930160629.1822-1-fourdollars@debian.org> <20260930160629.1822-6-fourdollars@debian.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260930160629.1822-6-fourdollars@debian.org> Hi, On Thu, Oct 01, 2026 at 12:06:28AM +0800, Shih-Yuan Lee wrote: > On platforms where Intel LPSS SPI is enumerated as a bare PCI device > (such as the Apple MacBook8,1 on Lynxpoint-LP), the LPSS power island > loses power during system sleep and powers up with the controller held > in reset. Because the device lacks ACPI companion objects or MFD > binding, neither drivers/acpi/x86/lpss.c nor drivers/mfd/intel-lpss.c > restore the private register context across S3 resume. Hmm, how is that possible? The LPSS is a single PCI device that only the the LPSS MFD driver binds to. I don't think it is any different in Apple platforms than any other regular PC platforms in that sense. What does lspci -vv show on this system?