From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 0557A18132A; Wed, 3 Jul 2024 11:29:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720006167; cv=none; b=FsRVxyoHa4pXtsNixIpKSuwSDjWIgSPfJgP8AwfJXv0G8R3PHXchOkEibB24M3hdo3lM6lmyvTxP2TkKGiB/Hzz4+M+onnYmY8zb+Ycyj4ZjUcvu34j1k8P8XryEVAjxoksfTZQXWH1XFe9VDTw9BRCPMJiWrSJyrR2k0bI2K1o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720006167; c=relaxed/simple; bh=GJ0HDf+RDyBQ+5s7fQiYm4mvLHLGBFEUjmrcsx/evII=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=X42yQCIHCSvFCuI5TaCNM6wQJBv5IeqjzG4kGmPTKWBhHdrMmOTFOykjf0ZswNY6Hp5bm+aCZGvUu7MaNn3D9IK8Mx7d/xPwEUR/KlSDWEPLzFSEUnEuDoIsvbv6lokNBc6VZQBm+F72QVnHTzeNXISNxthxaZAZuGEdWM58bGs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=epYKVQur; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="epYKVQur" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C186C2BD10; Wed, 3 Jul 2024 11:29:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1720006166; bh=GJ0HDf+RDyBQ+5s7fQiYm4mvLHLGBFEUjmrcsx/evII=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=epYKVQurmXsEdoCnUB3lrpqTyqtwCfFhgJ7l+XxB/0RU4aTdJVqs9KIkLzQ3FTgeg j+FhH1qzu22pspJG6ceOSMn1MjBXnou9B2rhd05B07f3TLyzq10l0EP2vn0FUFji4W HkNGRK94M4I243bInoAdEfUZHv71dVZSQ04PuXBE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Stefan Eichenberger Subject: [PATCH 5.15 323/356] serial: imx: set receiver level before starting uart Date: Wed, 3 Jul 2024 12:40:59 +0200 Message-ID: <20240703102925.335798101@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240703102913.093882413@linuxfoundation.org> References: <20240703102913.093882413@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Stefan Eichenberger commit a81dbd0463eca317eee44985a66aa6cc2ce5c101 upstream. Set the receiver level to something > 0 before calling imx_uart_start_rx in rs485_config. This is necessary to avoid an interrupt storm that might prevent the system from booting. This was seen on an i.MX7 device when the rs485-rts-active-low property was active in the device tree. Fixes: 6d215f83e5fc ("serial: imx: warn user when using unsupported configuration") Cc: stable Signed-off-by: Stefan Eichenberger Link: https://lore.kernel.org/r/20240621153829.183780-1-eichest@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1972,8 +1972,10 @@ static int imx_uart_rs485_config(struct /* Make sure Rx is enabled in case Tx is active with Rx disabled */ if (!(rs485conf->flags & SER_RS485_ENABLED) || - rs485conf->flags & SER_RS485_RX_DURING_TX) + rs485conf->flags & SER_RS485_RX_DURING_TX) { + imx_uart_setup_ufcr(sport, TXTL_DEFAULT, RXTL_DEFAULT); imx_uart_start_rx(port); + } port->rs485 = *rs485conf;