From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1BB53A4F36 for ; Tue, 14 Jul 2026 15:50:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784044205; cv=none; b=NPZXQZrP6SdLc/bN6bB+LBPuQlz6Unkm+ETLQ6OFghsDLDJMGkmFCNot9iRKHnyxMsnCVqdQ/2EV0iv+QonrcIhWUZ8iNFM8Euu71hbJhus5vH/QzQTBqTbne7waxCxS0n7j70KPevlNm+TpHiPrvSq0NRAsLGZRvJ9gWLIBAv8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784044205; c=relaxed/simple; bh=ReYe2pgmZL5/h03+PSORFqf9fomfhed705+LNcqc/FM=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=sfF5GoIaMBWOCpL7uUEYu9suYt2rK08KBzMvPDgNdsbfLF+zXs+SKtLKFuBJyX6FnP/hICDUyvLKLeRqp8dBcMd0Aua+m+jbLtNZPKoFq2+k7QjGT0Rbig3w2EE/03295Ms7t94f1ApEvLCIMYcA2pofiW6uO/54QFQCCibY+/U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2IdN82fy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2IdN82fy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C71651F000E9; Tue, 14 Jul 2026 15:50:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784044204; bh=gYLtqRQWy14kS4PXkvvENf6FUw6WUxop/IUUTksNLrc=; h=Subject:To:Cc:From:Date; b=2IdN82fy4VNbaR+wHMmTVEaACn1u5DJAOEYWcYOjW0cgc6gqeaA60FRWDhibYpWpG Z/w7g17H+TvwDqm/GijWNcqCnomM/n1lJu+vQHFA+j3Eme1r3HcglsN/0cDr7YQrZT PICTBfpR69bSlxujPjUnpg2uJWpMKT7tISEdQycc= Subject: FAILED: patch "[PATCH] serial: 8250_mid: Disable DMA for selected platforms" failed to apply to 6.6-stable tree To: andriy.shevchenko@linux.intel.com,gregkh@linuxfoundation.org,stable@kernel.org,zjianan156@gmail.com Cc: From: Date: Tue, 14 Jul 2026 17:49:58 +0200 Message-ID: <2026071458-expletive-shrubbery-16e0@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.6-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y git checkout FETCH_HEAD git cherry-pick -x b1b4efea05a56c0995e4702a86d6624b4fdff32f # git commit -s git send-email --to '' --in-reply-to '2026071458-expletive-shrubbery-16e0@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From b1b4efea05a56c0995e4702a86d6624b4fdff32f Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Fri, 26 Jun 2026 11:49:37 +0200 Subject: [PATCH] serial: 8250_mid: Disable DMA for selected platforms In accordance with Errata (specification updates) HSUART May Stop Functioning when DMA is Active. - Denverton document #572409, rev 3.4, DNV60 - Ice Lake Xeon D document #714070, ICXD65 - Snowridge document #731931, SNR44 For a quick fix just disable the respective callbacks during the device probe. Depending on the future development we might remove them completely. Reported-by: micas-opensource Closes: https://lore.kernel.org/linux-serial/20250625031409.2404219-1-opensource@ruijie.com.cn/ Fixes: 6ede6dcd87aa ("serial: 8250_mid: add support for DMA engine handling from UART MMIO") Cc: stable Signed-off-by: Andy Shevchenko Link: https://patch.msgid.link/20260626094937.561776-1-andriy.shevchenko@linux.intel.com Signed-off-by: Greg Kroah-Hartman diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index 8ec03863606e..f88809ff370b 100644 --- a/drivers/tty/serial/8250/8250_mid.c +++ b/drivers/tty/serial/8250/8250_mid.c @@ -10,6 +10,7 @@ #include #include #include +#include #include @@ -368,8 +369,16 @@ static const struct mid8250_board dnv_board = { .freq = 133333333, .base_baud = 115200, .bar = 1, - .setup = dnv_setup, - .exit = dnv_exit, + /* + * Errata: + * HSUART May Stop Functioning when DMA is Active. + * + * - Denverton document #572409, rev 3.4, DNV60 + * - Ice Lake Xeon D document #714070, ICXD65 + * - Snowridge document #731931, SNR44 + */ + .setup = PTR_IF(false, dnv_setup), + .exit = PTR_IF(false, dnv_exit), }; static const struct pci_device_id pci_ids[] = {