From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 B68EB3112B7; Wed, 29 Oct 2025 17:25:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761758756; cv=none; b=qLJzXNSVm7tsSdyKAMJjGxjQFKF+TlGRt56wiFmefa8YsO1a+NN02kBOlKUxs3CFrn7IHUUu+Qq7ukMcLlCVMiu05CQmRsOVtWPf3QjgP9GLNCroKk5UEgtA8v3QGS7lYt8tS1XXqoelvr+g18krpDnyLmGDv8ZFM9Qwwf8wzRM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761758756; c=relaxed/simple; bh=UNCv/SLEKVdIM0/F5Qh+o3LkOisYzz/k4Ngw7LOuDtI=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition:In-Reply-To; b=p0lugZHE2BIj377K/CMISoCk59TqCapBwoxAI1ezwql2M6k7brcMu6U885L74Xmx4HBZvuPkKtSziO3mIJp9LgNWf8V2vNEzeOPxuzuMycx8Ll7y17Lfl1/npkCbuLRbspg2bRiEa4L0cjqAG1GRVJA2jM8avcKC+lnaruCRw84= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PWuHWZJ+; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="PWuHWZJ+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1D4A8C4CEF7; Wed, 29 Oct 2025 17:25:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1761758756; bh=UNCv/SLEKVdIM0/F5Qh+o3LkOisYzz/k4Ngw7LOuDtI=; h=Date:From:To:Cc:Subject:In-Reply-To:From; b=PWuHWZJ+oT416PmcdJeCl9fvjHCkJFvtKNX1frItmY4dqgCUDhAjz0oSZ9qODt2ef Io0O15PkPD/uyhqnbe/y9MiXW+KucYH9xYGU25wyKLDab0A3ELRwYUAHplXUIumVdO rg60yYQWUd/mefNR48m2K6ssxnsTARoDO0CREaMYhAARUKqxOwe1UMO0QEws9iAxai 4VXTheLLFK1WBzjkyTWZiYk4EVK/ZqrBXYe63qdVM/xS0geger8Twg0mQvBB1ZwZKS dFAY9v4BQ9fbHFwx9W76Wrc0ho0S+1pglHvzoKxq8/sE+EVHKfhHGHBcgXvgxLqnGX STD/Opd53ruzQ== Date: Wed, 29 Oct 2025 12:25:54 -0500 From: Bjorn Helgaas To: Christian Zigotzky Cc: Johan Hovold , linux-pci@vger.kernel.org, Manivannan Sadhasivam , Naoki FUKAUMI , Herve Codina , Diederik de Haas , Dragan Simic , linuxppc-dev@lists.ozlabs.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, Bjorn Helgaas , Shawn Lin , Frank Li , "R.T.Dickinson" , mad skateman , hypexed@yahoo.com.au, Christian Zigotzky Subject: Re: [PATCH] PCI/ASPM: Enable only L0s and L1 for devicetree platforms Message-ID: <20251029172554.GA1571455@bhelgaas> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: On Wed, Oct 29, 2025 at 06:47:19AM +0100, Christian Zigotzky wrote: > > On 29 October 2025 at 00:33 am, Bjorn Helgaas wrote: > > On Mon, Oct 27, 2025 at 06:12:24PM +0100, Christian Zigotzky wrote: > >> Hi All, > >> > >> I activated CONFIG_PCIEASPM and CONFIG_PCIEASPM_DEFAULT again for the RC3 of > >> kernel 6.18. Unfortunately my AMD Radeon HD6870 doesn't work with the latest > >> patches. > >> > >> But that doesn't matter because we disable the above kernel options by > >> default. We don't need power management for PCI Express because of boot > >> issues and performance issues. > > > > If you have a chance, could you try the patch below on top of > > v6.18-rc3 with CONFIG_PCIEASPM=y? > > > > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > > index 214ed060ca1b..2b6d4e0958aa 100644 > > --- a/drivers/pci/quirks.c > > +++ b/drivers/pci/quirks.c > > @@ -2524,6 +2524,7 @@ static void quirk_disable_aspm_l0s_l1(struct pci_dev *dev) > > * disable both L0s and L1 for now to be safe. > > */ > > DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_disable_aspm_l0s_l1); > > +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_FREESCALE, 0x0451, quirk_disable_aspm_l0s_l1); > > > > /* > > * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain > > Thanks for the patch. > > I will test it on my FSL Cyrus+ board over the weekend. > BTW, I also tested my PASemi Nemo board with the RC3 of kernel 6.18 > and with power management for PCI Express enabled. Unfortunately, > the installed AMD Radeon HD5870 does not work with power management > for PCI Express enabled either. Oops, I made that fixup run too late. Instead of the patch above, can you test the one below? You'll likely see something like this, which is a little misleading because even though we claim "default L1" for 01:00.0 (or whatever your Radeon is), the fact that L0s and L1 are disabled at the other end of the link (00:00.0) should prevent us from actually enabling it: pci 0000:00:00.0: Disabling ASPM L0s/L1 pci 0000:01:00.0: ASPM: default states L1 diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index 214ed060ca1b..27777ded9a2c 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -2524,6 +2524,7 @@ static void quirk_disable_aspm_l0s_l1(struct pci_dev *dev) * disable both L0s and L1 for now to be safe. */ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ASMEDIA, 0x1080, quirk_disable_aspm_l0s_l1); +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_FREESCALE, 0x0451, quirk_disable_aspm_l0s_l1); /* * Some Pericom PCIe-to-PCI bridges in reverse mode need the PCIe Retrain