From nobody Thu Nov 28 20:29:38 2024 Received: from mail-oa1-f53.google.com (mail-oa1-f53.google.com [209.85.160.53]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0BB0813D531 for ; Mon, 30 Sep 2024 08:48:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.53 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727686096; cv=none; b=Zsyk77F9KenM1zVUzUy/I33wShQpm532ugcApLYZGFb94UhWY+F3bYKKxv+e5qbXvni7QAtN64+XBEXsBhBVItMgAkUh3KmkjUXwM/xxJ+KjNAXnr3ikJISF2ixZuixi/rGdLjZ6LAKqaiVfZALEQuH7JdXvw7bFmCBa7wUD6BI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727686096; c=relaxed/simple; bh=U+N6fg/c5wFr1Ckfoil5ymH2MOioONxXMWOiMGSRb6M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=tKAQOZVBv6vsQ7ISwysYwvyqbKp74Ee5JyaJl5Te6ImlZTa5hS1trE9DJR9civXAdVUc06Sf7RdAWrnUJzbLkUsQofBF2wpOPetkQ1IiKfIzywWTQy8I1FSchanWnFuLcBN6pCZG95r3xhM0cZJSLcnb/BXgUR/BZDE5BGsvWEE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=endlessos.org; spf=pass smtp.mailfrom=endlessos.org; dkim=pass (2048-bit key) header.d=endlessos.org header.i=@endlessos.org header.b=Uw5jRHeU; arc=none smtp.client-ip=209.85.160.53 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=endlessos.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=endlessos.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=endlessos.org header.i=@endlessos.org header.b="Uw5jRHeU" Received: by mail-oa1-f53.google.com with SMTP id 586e51a60fabf-27ce4f37afeso1623224fac.0 for ; Mon, 30 Sep 2024 01:48:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=endlessos.org; s=google; t=1727686094; x=1728290894; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=O/k2Ft8h3JSRNQa8sflgWnPU60S7BKrvPftgHnCSgfM=; b=Uw5jRHeUleKAcC6U3c5qB3j+Gcl9zBa5v1dpCIqA6v8/bHUjHzeMw+GHrGZYu5y0sy VaWFBmKBiOTJRTndIETOX34QU5TSERzGzWvkGaQYo+01opOomWO5FNiGqFxa1PXi+Y1I SbBWPdF66pjTpktNlNn9NnB76PYOc+KLDre0owxjCNnyVYgcKyFsG275T3n8w9UZCltD dPA3iGVwtxr4YjwGFkK8lMEeLAl/vxvG7LlY5RJ/7+WoCeTszcOhGz5EfQzUdp1uJM8A 4O5q+BOqyjmws1iiE3oJBuU61ypLtAJ0ZQ6HohLAdGf4NP3eHSaMwZhQUEUkGWY4ex8B a9Ww== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1727686094; x=1728290894; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=O/k2Ft8h3JSRNQa8sflgWnPU60S7BKrvPftgHnCSgfM=; b=Im52+yuKxzTXs/relQ6dBTxL+ZUPCNaLow15Sfg7uPmibOET+otRCrVn1tb/hJ/Nso BUDKa0rSPKmJ9uwjyHe7ljQ3fujqKeaGsyeE22q6k8Tlu0rp38c2t79mpcwbaxT5/tDh LjAgFFBo/ds4+To2n/Wmkk7DTeY7s0FlyeMQpYkrSjVKplwrpB37sJkcRfdwHAI05xC4 zl9XOlxxdzsO/8B05NyWRU06u5v5xuXhOmB44MbFLuER5h+SJ7QqW0QeRIifrOHj94Lj i7rg1WPI1xddzWQtVdghekiiaojDx7htboXWTutIEuCB+6bZTl+RoiO7LVUlo1K3QpUQ l39A== X-Forwarded-Encrypted: i=1; AJvYcCWPqUNkxGtYzQgugA2orPDAp5XkzUKknvmS5WTgIYkzqCsBP/GdS855oP7IQxhtPMGRH3kAqzWdArqdTHY=@vger.kernel.org X-Gm-Message-State: AOJu0Ywuu1lBC7qjPePiAPaa8SoEyZOyCTLRKkpvCLR3IYVICM1ojRF9 26dq/4hgZrXZ3e29esFno6DNyoizQ5x4XlAk8degFFuJKZ2ZDqR5Yv0nemM0F44= X-Google-Smtp-Source: AGHT+IEctgfFVEWe3ZkXkooElSMnX6+GspuiN7R7XD8Cqsgbc1F66DIhxam/a3LljXHHHb9R0Ru40w== X-Received: by 2002:a05:6870:55cc:b0:270:2abd:4772 with SMTP id 586e51a60fabf-28710bdc836mr5800613fac.45.1727686093838; Mon, 30 Sep 2024 01:48:13 -0700 (PDT) Received: from localhost.localdomain ([123.51.167.56]) by smtp.googlemail.com with ESMTPSA id 41be03b00d2f7-7e6db29278esm5922525a12.16.2024.09.30.01.48.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Sep 2024 01:48:13 -0700 (PDT) From: Jian-Hong Pan To: Bjorn Helgaas Cc: Johan Hovold , David Box , =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= , Kuppuswamy Sathyanarayanan , Nirmal Patel , Jonathan Derrick , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux@endlessos.org, Jian-Hong Pan Subject: [PATCH v11 1/3] PCI: vmd: Set PCI devices to D0 before enable PCI PM's L1 substates Date: Mon, 30 Sep 2024 16:29:27 +0800 Message-ID: <20240930082926.12966-2-jhp@endlessos.org> X-Mailer: git-send-email 2.46.2 In-Reply-To: <20240930082530.12839-2-jhp@endlessos.org> References: <20240930082530.12839-2-jhp@endlessos.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The remapped PCIe Root Port and the child device have PCI PM L1 substates capability, but they are disabled originally. Here is a failed example on ASUS B1400CEAE: Capabilities: [900 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+ PortCommonModeRestoreTime=3D32us PortTPowerOnTime=3D10us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- T_CommonMode=3D0us LTR1.2_Threshold=3D101376ns L1SubCtl2: T_PwrOn=3D50us Power on all of the VMD remapped PCI devices to D0 before enable PCI-PM L1 PM Substates by following "PCIe r6.0, sec 5.5.4". Link: https://bugzilla.kernel.org/show_bug.cgi?id=3D218394 Signed-off-by: Jian-Hong Pan Reviewed-by: Kuppuswamy Sathyanarayanan --- v2: - Power on the VMD remapped devices with pci_set_power_state_locked() - Prepare the PCIe LTR parameters before enable L1 Substates - Add note into the comments of both pci_enable_link_state() and pci_enable_link_state_locked() for kernel-doc. - The original patch set can be split as individual patches. v3: - Re-send for the missed version information. - Split drivers/pci/pcie/aspm.c modification into following patches. - Fix the comment for enasuring the PCI devices in D0. v4: - The same v5: - Tweak the commit title and message - Change the goto label from out_enable_link_state to out_state_change v6~8: - The same v9: - Update L1 PM Substates information against kernel v6.11 in commit message v10~11: - The same drivers/pci/controller/vmd.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c index 264a180403a0..11870d1fc818 100644 --- a/drivers/pci/controller/vmd.c +++ b/drivers/pci/controller/vmd.c @@ -740,11 +740,9 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, v= oid *userdata) if (!(features & VMD_FEAT_BIOS_PM_QUIRK)) return 0; =20 - pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL); - pos =3D pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_LTR); if (!pos) - return 0; + goto out_state_change; =20 /* * Skip if the max snoop LTR is non-zero, indicating BIOS has set it @@ -752,7 +750,7 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, vo= id *userdata) */ pci_read_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, <r_reg); if (!!(ltr_reg & (PCI_LTR_VALUE_MASK | PCI_LTR_SCALE_MASK))) - return 0; + goto out_state_change; =20 /* * Set the default values to the maximum required by the platform to @@ -764,6 +762,13 @@ static int vmd_pm_enable_quirk(struct pci_dev *pdev, v= oid *userdata) pci_write_config_dword(pdev, pos + PCI_LTR_MAX_SNOOP_LAT, ltr_reg); pci_info(pdev, "VMD: Default LTR value set by driver\n"); =20 +out_state_change: + /* + * Ensure devices are in D0 before enabling PCI-PM L1 PM Substates, per + * PCIe r6.0, sec 5.5.4. + */ + pci_set_power_state_locked(pdev, PCI_D0); + pci_enable_link_state_locked(pdev, PCIE_LINK_STATE_ALL); return 0; } =20 --=20 2.46.2