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GET /api/patches/2197773/?format=api
{ "id": 2197773, "url": "http://patchwork.ozlabs.org/api/patches/2197773/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260218134633.461181-5-Simon.Richter@hogyros.de/", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/projects/28/?format=api", "name": "Linux PCI development", "link_name": "linux-pci", "list_id": "linux-pci.vger.kernel.org", "list_email": "linux-pci@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260218134633.461181-5-Simon.Richter@hogyros.de>", "list_archive_url": null, "date": "2026-02-18T13:46:32", "name": "[v2,4/5] pci: check if VGA decoding was really activated", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "73251b92542b77654e2421035e25a92ec16916c1", "submitter": { "id": 91044, "url": "http://patchwork.ozlabs.org/api/people/91044/?format=api", "name": "Simon Richter", "email": "Simon.Richter@hogyros.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260218134633.461181-5-Simon.Richter@hogyros.de/mbox/", "series": [ { "id": 492553, "url": "http://patchwork.ozlabs.org/api/series/492553/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pci/list/?series=492553", "date": "2026-02-18T13:46:28", "name": "Bridges without VGA support", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/492553/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2197773/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197773/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-pci+bounces-47566-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pci@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=104.64.211.4; helo=sin.lore.kernel.org;\n envelope-from=linux-pci+bounces-47566-incoming=patchwork.ozlabs.org@vger.kernel.org;\n receiver=patchwork.ozlabs.org)", "smtp.subspace.kernel.org;\n arc=none smtp.client-ip=185.187.169.70", "smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=hogyros.de", "smtp.subspace.kernel.org;\n spf=pass smtp.mailfrom=hogyros.de" ], "Received": [ "from sin.lore.kernel.org (sin.lore.kernel.org [104.64.211.4])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4fGHrG3gJpz1xvq\n\tfor <incoming@patchwork.ozlabs.org>; Thu, 19 Feb 2026 00:47:26 +1100 (AEDT)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sin.lore.kernel.org (Postfix) with ESMTP id E0E6B300ADA1\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 18 Feb 2026 13:47:10 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id 26674328623;\n\tWed, 18 Feb 2026 13:47:07 +0000 (UTC)", "from psionic.psi5.com (psionic.psi5.com [185.187.169.70])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))\n\t(No client certificate requested)\n\tby smtp.subspace.kernel.org (Postfix) with ESMTPS id E5BBB328246\n\tfor <linux-pci@vger.kernel.org>; Wed, 18 Feb 2026 13:47:05 +0000 (UTC)", "from localhost.localdomain (unknown\n [IPv6:2400:2410:b120:f200:2e09:4dff:fe00:2e9])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest\n SHA256)\n\t(Client did not present a certificate)\n\tby psionic.psi5.com (Postfix) with ESMTPSA id 23D173F1F5;\n\tWed, 18 Feb 2026 14:47:02 +0100 (CET)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1771422427; cv=none;\n b=SK/SR+1hx0NQTkRtuNqforNPVl8JzrMKPbGDw0X3eUrIFW4EBNvi50BmWOrFB/9Z45mMnEczKntniNCG9GnxtEY8C/+DrIW3/AumHtK5+VYfaYQTlzfytDeLqNLe7jRFGaPVWtANyx4PaOPGrxh071p/kT1IFpQPK4rF9Y2Pxgg=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1771422427; c=relaxed/simple;\n\tbh=9UsxK+DHCwrPPzpZ/2/TiPEIPpPHkmwG6fZSiFBwVmw=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=S3bj7WA7+nMMmcUAh24th5xDvBXcuCmtzV9Yvqb64NfXBE7iUW+jEHM35GVnOlJNHPxDBBGNL7dvtWh9SJWbwROfhUM1SOFWWQhLDa3oItRsn1+T+qCs33SsIJCrchvreHX7S+3U/IbBmGpjOcgVq5HRRxuPmdrbqwrdn+J1Od0=", "ARC-Authentication-Results": "i=1; smtp.subspace.kernel.org;\n dmarc=none (p=none dis=none) header.from=hogyros.de;\n spf=pass smtp.mailfrom=hogyros.de; arc=none smtp.client-ip=185.187.169.70", "From": "Simon Richter <Simon.Richter@hogyros.de>", "To": "linux-pci@vger.kernel.org", "Cc": "intel-xe@lists.freedesktop.org,\n\tdri-devel@lists.freedesktop.org,\n\tSimon Richter <Simon.Richter@hogyros.de>", "Subject": "[PATCH v2 4/5] pci: check if VGA decoding was really activated", "Date": "Wed, 18 Feb 2026 22:46:32 +0900", "Message-ID": "<20260218134633.461181-5-Simon.Richter@hogyros.de>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260218134633.461181-1-Simon.Richter@hogyros.de>", "References": "<20260217170419.236739-1-Simon.Richter@hogyros.de>\n <20260218134633.461181-1-Simon.Richter@hogyros.de>", "Precedence": "bulk", "X-Mailing-List": "linux-pci@vger.kernel.org", "List-Id": "<linux-pci.vger.kernel.org>", "List-Subscribe": "<mailto:linux-pci+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:linux-pci+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit" }, "content": "PCI bridges are allowed to refuse activating VGA decoding, by simply\nignoring attempts to set the bit that enables it, so after setting the bit,\nread it back to verify.\n\nOne example of such a bridge is the root bridge in IBM PowerNV.\n\nSigned-off-by: Simon Richter <Simon.Richter@hogyros.de>\n---\n drivers/pci/pci.c | 6 ++++++\n 1 file changed, 6 insertions(+)", "diff": "diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c\nindex f3244630bfd0..0984a0aefb88 100644\n--- a/drivers/pci/pci.c\n+++ b/drivers/pci/pci.c\n@@ -6198,6 +6198,12 @@ int pci_set_vga_state(struct pci_dev *dev, bool decode,\n \t\t\t\tcmd &= ~PCI_BRIDGE_CTL_VGA;\n \t\t\tpci_write_config_word(bridge, PCI_BRIDGE_CONTROL,\n \t\t\t\t\t cmd);\n+\t\t\tif (decode) {\n+\t\t\t\tpci_read_config_word(bridge, PCI_BRIDGE_CONTROL,\n+\t\t\t\t\t\t &cmd);\n+\t\t\t\tif(!(cmd & PCI_BRIDGE_CTL_VGA))\n+\t\t\t\t\treturn -EIO;\n+\t\t\t}\n \t\t}\n \t\tbus = bus->parent;\n \t}\n", "prefixes": [ "v2", "4/5" ] }