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 724992222AA for ; Sat, 18 Jul 2026 01:00:02 +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=1784336403; cv=none; b=S80Yw0e6dGEYm/mw8wXMLHLbDVNpXUL1nINHDfb8dg0JCVFNj0S42LXwCLdRHS0eBVPQCeGtYPR9eAEWhMJ0MVkx7BoN0BgvuGf0fp86RyeZTFBiUfLJ0Bz65Er1W4L1Nx+iIPzezTGSxmImgkuOG7Lbu3QAl45RFWAsVAqJLbU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784336403; c=relaxed/simple; bh=t5dfLnmYrFlvfi9cFjKLCh9Lsw9U8pkmQFfRb4GC2sQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XmCeSmW2+Nk1vxPJHDLvaXuKj4t/x/Z+ej3d2RUt9ndW1HIwIrUozPFcwz6foVerSVdZp14KX66IiyAtSdBj286gIurUXbClde1gaRPpHpBVUL9zwnb9ZihAWuNEbjLGElGezMb3cWUlhQ6Xz5Irh2AdCQQj230TBD9/0v098js= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=KkSXrLYk; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="KkSXrLYk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9DBD31F00A3D; Sat, 18 Jul 2026 01:00:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784336402; bh=zEy0vrcIAQdZHqGH6iHTtKXXYXKbKBH7te6MIzhw6p0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=KkSXrLYkSTPgBOoLTHb1bo4rMWOSJPIU1r2GdF4u6eZDWvxBe1BgOFg8CnyRcZYWg Qnz24eKXd6Y5jIIMX3PYg3sLNTLkmTt+nmcFrGXfnCwTRv5R33SZ3aCE1Q+4B9lPu4 j6CWZjVtr2VMnJ3mur75qm1wp+F6LHwDEBscKP64uNQYvm+pr+TEjdshQICftSSwl0 PA5j4N/myBvylJdHpJzLo/d0Yck2XZq6E9qOytxaH9LvRycvqOLQ/BucVa59lUyMLR B9AQbpI8QKHJl9bb5Kons2EsNOhwLH41lw/GUngT2tCjeFjBRfesuqNlSAqpckXLqR 5Qqtb/KO7vxNg== From: Sasha Levin To: stable@vger.kernel.org Cc: Andy Shevchenko , micas-opensource , stable , Greg Kroah-Hartman , Sasha Levin Subject: [PATCH 5.15.y 2/2] serial: 8250_mid: Disable DMA for selected platforms Date: Fri, 17 Jul 2026 20:59:58 -0400 Message-ID: <20260718005958.2505769-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260718005958.2505769-1-sashal@kernel.org> References: <2026071458-footpad-hunting-e8d7@gregkh> <20260718005958.2505769-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Andy Shevchenko [ Upstream commit b1b4efea05a56c0995e4702a86d6624b4fdff32f ] 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 Signed-off-by: Sasha Levin --- drivers/tty/serial/8250/8250_mid.c | 13 +++++++++++-- 1 file changed, 11 insertions(+), 2 deletions(-) diff --git a/drivers/tty/serial/8250/8250_mid.c b/drivers/tty/serial/8250/8250_mid.c index 220857a45ac2d3..9a4c6466ab026d 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 @@ -371,8 +372,16 @@ 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), }; #define MID_DEVICE(id, board) { PCI_VDEVICE(INTEL, id), (kernel_ulong_t)&board } -- 2.53.0