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GET /api/patches/2180424/?format=api
{ "id": 2180424, "url": "http://patchwork.ozlabs.org/api/patches/2180424/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260106141420.1585948-3-vitaly.lifshits@intel.com/", "project": { "id": 46, "url": "http://patchwork.ozlabs.org/api/projects/46/?format=api", "name": "Intel Wired Ethernet development", "link_name": "intel-wired-lan", "list_id": "intel-wired-lan.osuosl.org", "list_email": "intel-wired-lan@osuosl.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260106141420.1585948-3-vitaly.lifshits@intel.com>", "list_archive_url": null, "date": "2026-01-06T14:14:20", "name": "[iwl-net,v4,2/2] e1000e: clear DPG_EN after reset to avoid autonomous power-gating", "commit_ref": null, "pull_url": null, "state": "under-review", "archived": false, "hash": "b659697893e179b4f51c93138652d403fb27ce3c", "submitter": { "id": 76816, "url": "http://patchwork.ozlabs.org/api/people/76816/?format=api", "name": "Lifshits, Vitaly", "email": "vitaly.lifshits@intel.com" }, "delegate": { "id": 109701, "url": "http://patchwork.ozlabs.org/api/users/109701/?format=api", "username": "anguy11", "first_name": "Anthony", "last_name": "Nguyen", "email": "anthony.l.nguyen@intel.com" }, "mbox": "http://patchwork.ozlabs.org/project/intel-wired-lan/patch/20260106141420.1585948-3-vitaly.lifshits@intel.com/mbox/", "series": [ { "id": 487342, "url": "http://patchwork.ozlabs.org/api/series/487342/?format=api", "web_url": "http://patchwork.ozlabs.org/project/intel-wired-lan/list/?series=487342", "date": "2026-01-06T14:14:18", "name": "e1000e: avoid unexpected autonomous power-gating on Panther Lake devices", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/487342/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2180424/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2180424/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<intel-wired-lan-bounces@osuosl.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "intel-wired-lan@lists.osuosl.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=osuosl.org header.i=@osuosl.org header.a=rsa-sha256\n header.s=default header.b=WjSY8WCR;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=osuosl.org\n (client-ip=2605:bc80:3010::138; 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envelope-from=intel-wired-lan-bounces@osuosl.org;\n receiver=<UNKNOWN> ", "DKIM-Filter": [ "OpenDKIM Filter v2.11.0 smtp1.osuosl.org 81BDF810B3", "OpenDKIM Filter v2.11.0 smtp4.osuosl.org 84BF5401EC" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=osuosl.org;\n\ts=default; t=1767708874;\n\tbh=VoNWbxce1YsS6P3Mrh/sOsMwTdrVmsyKtnuZ3Sg4t7M=;\n\th=From:To:Cc:Date:In-Reply-To:References:Subject:List-Id:\n\t List-Unsubscribe:List-Archive:List-Post:List-Help:List-Subscribe:\n\t From;\n\tb=WjSY8WCRjG+ZEuHpAzLvYUXi2uOPAyD7d7Sludordq6h3uuqRRySrWUXr8aTJ425Z\n\t U9NQ5OQCyFXOdSjxfdn5IqbFt9yxUwe+G1rNUffvODuh47oLt6xXWQpNTTfxeCJ3va\n\t MTm/neWSsteVDZ/bKYyh3aFxs9uZCU7el9lfc4m77txWyh57au6Ls9Bo57E5GtWAd5\n\t FS7Z/i2kqHkSmjwZZ4k5aLueB9H3PNxb5jT5PqzX/gML6xdkIA4+9GjrK6B2qLVQXv\n\t Ri4SasE42DSpA+Fcu5sWNkVyePaJg+iP30AEHl1+1x5q4hEQJHS3e/vXlMnsxVl6zH\n\t c3WXCsjFJpuhA==", "Received-SPF": "Pass (mailfrom) identity=mailfrom; client-ip=198.175.65.10;\n helo=mgamail.intel.com; envelope-from=vitaly.lifshits@intel.com;\n receiver=<UNKNOWN>", "DMARC-Filter": "OpenDMARC Filter v1.4.2 smtp4.osuosl.org 84BF5401EC", "X-CSE-ConnectionGUID": [ "FUfs9Q0US0ObWASw8DMweg==", "JhlzpY96TCi71XFk2Y4bcw==" ], "X-CSE-MsgGUID": [ "L0KH1jn+Swq664nNgWR2YA==", "BODGjNFcTjimq3lxntkLhw==" ], "X-IronPort-AV": [ "E=McAfee;i=\"6800,10657,11663\"; a=\"86491214\"", "E=Sophos;i=\"6.21,204,1763452800\"; d=\"scan'208\";a=\"86491214\"", "E=Sophos;i=\"6.21,204,1763452800\"; d=\"scan'208\";a=\"226199286\"" ], "X-ExtLoop1": "1", "From": "Vitaly Lifshits <vitaly.lifshits@intel.com>", "To": "intel-wired-lan@lists.osuosl.org", "Cc": "Vitaly Lifshits <vitaly.lifshits@intel.com>", "Date": "Tue, 6 Jan 2026 16:14:20 +0200", "Message-Id": "<20260106141420.1585948-3-vitaly.lifshits@intel.com>", "X-Mailer": "git-send-email 2.34.1", "In-Reply-To": "<20260106141420.1585948-1-vitaly.lifshits@intel.com>", "References": "<20260106141420.1585948-1-vitaly.lifshits@intel.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Mailman-Original-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple;\n d=intel.com; i=@intel.com; q=dns/txt; s=Intel;\n t=1767708871; x=1799244871;\n h=from:to:cc:subject:date:message-id:in-reply-to:\n references:mime-version:content-transfer-encoding;\n bh=hFobxG8+WPHaXyQwWSZ/n8vBY+GsXQWSpgZlNw55wsA=;\n b=NYAJ5SsvtmuiQATvOPoBIVyHL6gEVvSUHYXp2BSHKJ0Vg/hoGcVdheN0\n lqff6KTEAPJIN9Eo+7rGUVcIQeeRgz83tDpzGZhQPPkMACjbwJj4AefOw\n oowt+Uv19vk4WrIJnRFiYS50HkbiDXliTquBE10dyqUOYtNVLEtFomjJ8\n MtwB5w6ONrOOUozTMNHAY6loSASm5QblRlJ4wa9clbM7zgEYkh/E2wTsG\n bInPKWCq9isT1tCANUL7gGEoVr/HBVKQmdHFW6J6D3k/Pdjz/Y84XqYoO\n AuzYMUnQMqfbj3R7U8dcRWryNDVVK2cBpvPo8Yoc/zlmRJ0NU2/83ZorP\n A==;", "X-Mailman-Original-Authentication-Results": [ "smtp4.osuosl.org;\n dmarc=pass (p=none dis=none)\n header.from=intel.com", "smtp4.osuosl.org;\n dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com\n header.a=rsa-sha256 header.s=Intel header.b=NYAJ5Ssv" ], "Subject": "[Intel-wired-lan] [PATCH iwl-net v4 2/2] e1000e: clear DPG_EN after\n reset to avoid autonomous power-gating", "X-BeenThere": "intel-wired-lan@osuosl.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Intel Wired Ethernet Linux Kernel Driver Development\n <intel-wired-lan.osuosl.org>", "List-Unsubscribe": "<https://lists.osuosl.org/mailman/options/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=unsubscribe>", "List-Archive": "<http://lists.osuosl.org/pipermail/intel-wired-lan/>", "List-Post": "<mailto:intel-wired-lan@osuosl.org>", "List-Help": "<mailto:intel-wired-lan-request@osuosl.org?subject=help>", "List-Subscribe": "<https://lists.osuosl.org/mailman/listinfo/intel-wired-lan>,\n <mailto:intel-wired-lan-request@osuosl.org?subject=subscribe>", "Errors-To": "intel-wired-lan-bounces@osuosl.org", "Sender": "\"Intel-wired-lan\" <intel-wired-lan-bounces@osuosl.org>" }, "content": "Panther Lake systems introduced an autonomous power gating feature for\nthe integrated Gigabit Ethernet in shutdown state (S5) state. As part of\nit, the reset value of DPG_EN bit was changed to 1. Clear this bit after\nperforming hardware reset to avoid errors such as Tx/Rx hangs, or packet\nloss/corruption.\n\nFixes: 0c9183ce61bc (\"e1000e: Add support for the next LOM generation\")\nSigned-off-by: Vitaly Lifshits <vitaly.lifshits@intel.com>\n---\nv4: fix commit message\nv3: rephrase a comment in the code\nv2: fix a typo in a macro\nv1: initial version\n---\n drivers/net/ethernet/intel/e1000e/ich8lan.c | 10 ++++++++++\n 2 files changed, 11 insertions(+)", "diff": "diff --git a/drivers/net/ethernet/intel/e1000e/defines.h b/drivers/net/ethernet/intel/e1000e/defines.h\nindex ba331899d186..d4a1041e456d 100644\n--- a/drivers/net/ethernet/intel/e1000e/defines.h\n+++ b/drivers/net/ethernet/intel/e1000e/defines.h\n@@ -33,6 +33,7 @@\n \n /* Extended Device Control */\n #define E1000_CTRL_EXT_LPCD 0x00000004 /* LCD Power Cycle Done */\n+#define E1000_CTRL_EXT_DPG_EN\t0x00000008 /* Dynamic Power Gating Enable */\n #define E1000_CTRL_EXT_SDP3_DATA 0x00000080 /* Value of SW Definable Pin 3 */\n #define E1000_CTRL_EXT_FORCE_SMBUS 0x00000800 /* Force SMBus mode */\n #define E1000_CTRL_EXT_EE_RST 0x00002000 /* Reinitialize from EEPROM */\ndiff --git a/drivers/net/ethernet/intel/e1000e/ich8lan.c b/drivers/net/ethernet/intel/e1000e/ich8lan.c\nindex eead80bba6f4..13841daba399 100644\n--- a/drivers/net/ethernet/intel/e1000e/ich8lan.c\n+++ b/drivers/net/ethernet/intel/e1000e/ich8lan.c\n@@ -4932,6 +4932,16 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)\n \treg |= E1000_KABGTXD_BGSQLBIAS;\n \tew32(KABGTXD, reg);\n \n+\t/*\n+\t * The hardware reset value of the DPG_EN bit is 1.\n+\t * Clear DPG_EN to prevent unexpected autonomous power gating.\n+\t */\n+\tif (hw->mac.type >= e1000_pch_ptp) {\n+\t\treg = er32(CTRL_EXT);\n+\t\treg &= ~E1000_CTRL_EXT_DPG_EN;\n+\t\tew32(CTRL_EXT, reg);\n+\t}\n+\n \treturn 0;\n }\n \n", "prefixes": [ "iwl-net", "v4", "2/2" ] }