From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4E81FC5AD49 for ; Wed, 4 Jun 2025 02:35:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/MCTBHjfYYGboMN5tBsGWhJPHluHXNJtXW07PoQmsdk=; b=m9KyVJq6MGp1EKA4egE2JrM4uc kMsszozpmhE8Ii/BHKCNewOVRU4wqi/fYUxl+Mszmdkz5O6z9ZU0+5krwRDSCpTTTPjU9S9S3c/mr xb2dGF5m2K0121JfXcUsY2ryDRF7t0xiwHvLBjlk4lo3KN1V70JaQu5hwCX9AnQ/DbEUnWkMFtKBK TXg7yrF8CMsN7AfhXmHNBMREp6e42eP9/xXVrIX1/hwHeQpctuaLoyuhdYk5RA14xfGft2E+AplgO GQ2ZWeH0T7+GapZDHzKzb33lOUcUYvRKMXz40pd3qVVsRFIYiO/JuXLeBJ4V04O1ccIo7xHYpgPJA kCmbhZ0Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMdxw-0000000CKWR-0uFr; Wed, 04 Jun 2025 02:34:56 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMcWW-0000000C8Lt-0sHQ; Wed, 04 Jun 2025 01:02:32 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id A3C65629D1; Wed, 4 Jun 2025 01:02:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 05EE8C4CEED; Wed, 4 Jun 2025 01:02:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748998951; bh=Aqdj2Q6TlvmodVFHhnYb7j0rcFO/cZVP0AUSuTr1dlU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MGqnI6yOCJLdjBsuznr8SSW4/UdZcqdYz3VSihoJQXFOn09dXs6vJw7RdCQsVJonx FwatGKsJEs4QORO31dQZx4nQV2pAjqMfmlxlwJ+t//VZ1yITAAmQjTF2INZQA3t8RO XlMrIj2ex1kypsU0Dzjrz46u4nrlNAAxuYbDHrlCfy/SpO53q0zLxOAKl9/1JSWDDN NEc0JEnlZf8hUVtuR6GYNH10VM0EKnWVX6yqsGYy8/5Zr5WExcDPkEF4l5F5JlBrBZ qn1kkkZqSAwEDOO6m4ZYcjKtEDRKWPoi0/FMh7SwtbtEXLJArkuzaL3vQrKm83QW0s 1AsrDN4wIdxMQ== From: Sasha Levin To: patches@lists.linux.dev, stable@vger.kernel.org Cc: Henk Vergonet , Lorenzo Bianconi , Felix Fietkau , Sasha Levin , matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, uwu@icenowy.me, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH AUTOSEL 6.6 09/62] wifi: mt76: mt76x2: Add support for LiteOn WN4516R,WN4519R Date: Tue, 3 Jun 2025 21:01:20 -0400 Message-Id: <20250604010213.3462-9-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250604010213.3462-1-sashal@kernel.org> References: <20250604010213.3462-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.6.92 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Henk Vergonet [ Upstream commit 3c0e4f606d8693795a2c965d6f4987b1bfc31097 ] Adds support for: - LiteOn WN4516R - LiteOn WN4519R Both use: - A nonstandard USB connector - Mediatek chipset MT7600U - ASIC revision: 76320044 Disabled VHT support on ASIC revision 76320044: This fixes the 5G connectibity issue on LiteOn WN4519R module see https://github.com/openwrt/mt76/issues/971 And may also fix the 5G issues on the XBox One Wireless Adapter see https://github.com/openwrt/mt76/issues/200 I have looked at the FCC info related to the MT7632U chip as mentioned in here: https://github.com/openwrt/mt76/issues/459 These confirm the chipset does not support 'ac' mode and hence VHT should be turned of. Signed-off-by: Henk Vergonet Acked-by: Lorenzo Bianconi Link: https://patch.msgid.link/20250418143914.31384-1-henk.vergonet@gmail.com Signed-off-by: Felix Fietkau Signed-off-by: Sasha Levin --- **YES** This commit should be backported to stable kernel trees. Here's my detailed analysis: ## Comparison with Similar Commits This commit closely matches **Similar Commit #1** (XBox One wifi adapter support) which was marked as **YES** for backporting. Both commits: - Add new USB device IDs for wireless adapters - Include hardware-specific workarounds for device limitations - Fix connectivity issues for specific hardware ## Code Changes Analysis ### 1. USB Device ID Additions (Low Risk) ```c { USB_DEVICE(0x0471, 0x2126) }, /bin /bin.usr-is-merged /boot /dev /etc /home /init /lib /lib.usr-is-merged /lib64 /lost+found /media /mnt /opt /proc /root /run /sbin /sbin.usr-is-merged /snap /srv /sys /tmp /usr /var LiteOn WN4516R module, nonstandard USB connector linux/ { USB_DEVICE(0x0471, 0x7600) }, /bin /bin.usr-is-merged /boot /dev /etc /home /init /lib /lib.usr-is-merged /lib64 /lost+found /media /mnt /opt /proc /root /run /sbin /sbin.usr-is-merged /snap /srv /sys /tmp /usr /var LiteOn WN4519R module, nonstandard USB connector linux/ ``` - **Risk**: Minimal - adding device IDs is very safe - **Impact**: Enables support for new hardware without affecting existing devices - **Scope**: Contained to device identification ### 2. VHT Capability Fix (Critical Bug Fix) ```c switch (dev->mt76.rev) { case 0x76320044: /bin /bin.usr- is-merged /boot /dev /etc /home /init /lib /lib.usr-is-merged /lib64 /lost+found /media /mnt /opt /proc /root /run /sbin /sbin.usr-is-merged /snap /srv /sys /tmp /usr /var these ASIC revisions do not support VHT linux/ vht = false; break; default: vht = true; break; } ``` - **Fixes critical connectivity issues**: The commit explicitly fixes 5G connectivity problems - **Hardware-specific workaround**: Targets a specific ASIC revision (0x76320044) - **Conservative approach**: Disables problematic VHT only for affected hardware - **Minimal regression risk**: Existing devices continue using VHT as before ## Backport Suitability Criteria ✅ **Fixes user-affecting bugs**: Resolves 5G connectivity issues on LiteOn modules and potentially XBox One adapters ✅ **Small and contained**: Changes are minimal - 2 new USB IDs and a targeted VHT disable ✅ **No architectural changes**: Uses existing framework, just adds device support and fixes capability detection ✅ **References external issues**: Links to GitHub issues #971 and #200, indicating real user problems ✅ **Clear side effects documentation**: VHT disabling is well-documented and justified with FCC information ✅ **Follows stable tree rules**: Important hardware support fix with minimal regression risk ✅ **Confined to subsystem**: Changes limited to mt76x2 USB driver ## Hardware Impact Assessment The commit addresses **confirmed hardware limitations** where VHT was incorrectly enabled on chipsets that don't support it, causing: - Connection failures in 5GHz band - Potential instability when VHT features are attempted This matches the pattern of **Similar Commit #1** which added support for newer XBox One adapters and was successfully backported. The risk/benefit ratio strongly favors backporting: minimal code changes that fix real connectivity issues for specific hardware without affecting other devices. drivers/net/wireless/mediatek/mt76/mt76x2/usb.c | 2 ++ .../net/wireless/mediatek/mt76/mt76x2/usb_init.c | 13 ++++++++++++- 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/usb.c b/drivers/net/wireless/mediatek/mt76/mt76x2/usb.c index d804309992196..229a365370ef5 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x2/usb.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x2/usb.c @@ -17,6 +17,8 @@ static const struct usb_device_id mt76x2u_device_table[] = { { USB_DEVICE(0x057c, 0x8503) }, /* Avm FRITZ!WLAN AC860 */ { USB_DEVICE(0x7392, 0xb711) }, /* Edimax EW 7722 UAC */ { USB_DEVICE(0x0e8d, 0x7632) }, /* HC-M7662BU1 */ + { USB_DEVICE(0x0471, 0x2126) }, /* LiteOn WN4516R module, nonstandard USB connector */ + { USB_DEVICE(0x0471, 0x7600) }, /* LiteOn WN4519R module, nonstandard USB connector */ { USB_DEVICE(0x2c4e, 0x0103) }, /* Mercury UD13 */ { USB_DEVICE(0x0846, 0x9053) }, /* Netgear A6210 */ { USB_DEVICE(0x045e, 0x02e6) }, /* XBox One Wireless Adapter */ diff --git a/drivers/net/wireless/mediatek/mt76/mt76x2/usb_init.c b/drivers/net/wireless/mediatek/mt76/mt76x2/usb_init.c index 33a14365ec9b9..3b55628115115 100644 --- a/drivers/net/wireless/mediatek/mt76/mt76x2/usb_init.c +++ b/drivers/net/wireless/mediatek/mt76/mt76x2/usb_init.c @@ -191,6 +191,7 @@ int mt76x2u_register_device(struct mt76x02_dev *dev) { struct ieee80211_hw *hw = mt76_hw(dev); struct mt76_usb *usb = &dev->mt76.usb; + bool vht; int err; INIT_DELAYED_WORK(&dev->cal_work, mt76x2u_phy_calibrate); @@ -217,7 +218,17 @@ int mt76x2u_register_device(struct mt76x02_dev *dev) /* check hw sg support in order to enable AMSDU */ hw->max_tx_fragments = dev->mt76.usb.sg_en ? MT_TX_SG_MAX_SIZE : 1; - err = mt76_register_device(&dev->mt76, true, mt76x02_rates, + switch (dev->mt76.rev) { + case 0x76320044: + /* these ASIC revisions do not support VHT */ + vht = false; + break; + default: + vht = true; + break; + } + + err = mt76_register_device(&dev->mt76, vht, mt76x02_rates, ARRAY_SIZE(mt76x02_rates)); if (err) goto fail; -- 2.39.5