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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8EFC1ECAAA1 for ; Tue, 6 Sep 2022 11:43:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232406AbiIFLnm (ORCPT ); Tue, 6 Sep 2022 07:43:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34810 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232203AbiIFLnm (ORCPT ); Tue, 6 Sep 2022 07:43:42 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 395AE33401 for ; Tue, 6 Sep 2022 04:43:41 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id EF675B81684 for ; Tue, 6 Sep 2022 11:43:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 63013C433D7; Tue, 6 Sep 2022 11:43:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1662464618; bh=9s9v0orFS6h1agJvPswPl08qthULOfshfn1gNh0oYu8=; h=Subject:To:Cc:From:Date:From; b=MqUZlb52V4uO9iqVjns0IHkuRtldTjZzRsh1q3g5+scaay5c+1U5zoLZOw4JOggq4 3ng/eK7Ev1zumygfTLGQvCQpb1tPIXuohzP8R5sPbABvhzGIgILeHQA89op8kL8Jdu L8IWqnmPIFzfFqWvCsurwuBjJYgwX8H3+npjn+Is= Subject: FAILED: patch "[PATCH] USB: serial: ch341: fix disabled rx timer on older devices" failed to apply to 5.15-stable tree To: johan@kernel.org, jwoithe@just42.net Cc: From: Date: Tue, 06 Sep 2022 13:42:08 +0200 Message-ID: <1662464528244161@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org The patch below does not apply to the 5.15-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 . Possible dependencies: 41ca302a697b ("USB: serial: ch341: fix disabled rx timer on older devices") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 41ca302a697b64a3dab4676e01d0d11bb184737d Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 31 Aug 2022 10:15:25 +0200 Subject: [PATCH] USB: serial: ch341: fix disabled rx timer on older devices At least one older CH341 appears to have the RX timer enable bit inverted so that setting it disables the RX timer and prevents the FIFO from emptying until it is full. Only set the RX timer enable bit for devices with version newer than 0x27 (even though this probably affects all pre-0x30 devices). Reported-by: Jonathan Woithe Tested-by: Jonathan Woithe Link: https://lore.kernel.org/r/Ys1iPTfiZRWj2gXs@marvin.atrad.com.au Fixes: 4e46c410e050 ("USB: serial: ch341: reinitialize chip on reconfiguration") Cc: stable@vger.kernel.org # 4.10 Signed-off-by: Johan Hovold diff --git a/drivers/usb/serial/ch341.c b/drivers/usb/serial/ch341.c index 2bcce172355b..af01a462cc43 100644 --- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -253,8 +253,12 @@ static int ch341_set_baudrate_lcr(struct usb_device *dev, /* * CH341A buffers data until a full endpoint-size packet (32 bytes) * has been received unless bit 7 is set. + * + * At least one device with version 0x27 appears to have this bit + * inverted. */ - val |= BIT(7); + if (priv->version > 0x27) + val |= BIT(7); r = ch341_control_out(dev, CH341_REQ_WRITE_REG, CH341_REG_DIVISOR << 8 | CH341_REG_PRESCALER,