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GET /api/1.0/patches/2197344/?format=api
{ "id": 2197344, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2197344/?format=api", "project": { "id": 28, "url": "http://patchwork.ozlabs.org/api/1.0/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 }, "msgid": "<20260217170419.236739-5-Simon.Richter@hogyros.de>", "date": "2026-02-17T17:04:18", "name": "[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/1.0/people/91044/?format=api", "name": "Simon Richter", "email": "Simon.Richter@hogyros.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pci/patch/20260217170419.236739-5-Simon.Richter@hogyros.de/mbox/", "series": [ { "id": 492462, "url": "http://patchwork.ozlabs.org/api/1.0/series/492462/?format=api", "date": "2026-02-17T17:04:19", "name": "bridges without VGA support", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492462/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197344/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-pci+bounces-47486-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=2600:3c0a:e001:db::12fc:5321; helo=sea.lore.kernel.org;\n envelope-from=linux-pci+bounces-47486-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 sea.lore.kernel.org (sea.lore.kernel.org\n [IPv6:2600:3c0a:e001:db::12fc:5321])\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 4fFmTs0N1tz1xpl\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 18 Feb 2026 04:14:41 +1100 (AEDT)", "from smtp.subspace.kernel.org (conduit.subspace.kernel.org\n [100.90.174.1])\n\tby sea.lore.kernel.org (Postfix) with ESMTP id A10873046BBB\n\tfor <incoming@patchwork.ozlabs.org>; Tue, 17 Feb 2026 17:13:57 +0000 (UTC)", "from localhost.localdomain (localhost.localdomain [127.0.0.1])\n\tby smtp.subspace.kernel.org (Postfix) with ESMTP id C98C936EA87;\n\tTue, 17 Feb 2026 17:13:55 +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 EB8D636EA9A\n\tfor <linux-pci@vger.kernel.org>; Tue, 17 Feb 2026 17:13:53 +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 D101848A3B;\n\tTue, 17 Feb 2026 18:04:47 +0100 (CET)" ], "ARC-Seal": "i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116;\n\tt=1771348435; cv=none;\n b=RkVKitMkACLp9dyTudk3NcHZZcoEkjOrY3iFY0/XFzSaavEmo8ERUkihMaUm+i7GjrxPDMFohJutTDi9uTR8yQMPKTR29o7dehTcxE2nYDvg3LF7l/VHeVw9hKnAY7ZCF8lN2OWyGk0Eea6IzDKpzFwK7dtrUfnqR/CnSKrY964=", "ARC-Message-Signature": "i=1; a=rsa-sha256; d=subspace.kernel.org;\n\ts=arc-20240116; t=1771348435; c=relaxed/simple;\n\tbh=38JmW/h+/76TrY6zhOVtMMo787EL8xmv9oNbACan8Tw=;\n\th=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References:\n\t MIME-Version;\n b=VXvhL+aCMjndjm3HYQ02i0oHkl7FNqmsI2SoAlMrIzPxOA64d9laGZFaRp2o1fdi9fZb5FBwKaqn6qn2DrCCmrU6Vd5NALvB77S8C8CB+tajrm67khloG94J3rBAZ7wMSso7n7FoB7oAWwme/K+EGPQZoIrQocSK8D5/FJzGdfg=", "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 4/5] pci: check if VGA decoding was really activated", "Date": "Wed, 18 Feb 2026 02:04:18 +0900", "Message-ID": "<20260217170419.236739-5-Simon.Richter@hogyros.de>", "X-Mailer": "git-send-email 2.47.3", "In-Reply-To": "<20260217170419.236739-1-Simon.Richter@hogyros.de>", "References": "<20260217170419.236739-1-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 ignoring\nattempts to set the bit that enables it, so after setting the bit, read it\nback 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": [ "4/5" ] }