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 X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 195A9C433E9 for ; Mon, 1 Mar 2021 19:26:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DF359601FA for ; Mon, 1 Mar 2021 19:26:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234676AbhCATZ4 (ORCPT ); Mon, 1 Mar 2021 14:25:56 -0500 Received: from mail.kernel.org ([198.145.29.99]:46160 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241421AbhCATVo (ORCPT ); Mon, 1 Mar 2021 14:21:44 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7FA5065243; Mon, 1 Mar 2021 17:27:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1614619637; bh=sL1zLTgzyVQcrdT1sm43KNumDWpFDbBz6iB+WqQirwY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L6GIPJuqjn0EGmVHbEXr9slXtkYcgmiNwMWUaolWUP+l4pGD5EjHT5gH2vNYBwIS7 FwSFpKSsJ3Cl6qHHas/jKFEGBVyTOeKr4BgA8JeiTbnlaUOmYhFvD+J+eJafCOtHNt b5s0gfl8myXS9Lp+DKPSbpkuXFOLf0DFxDwYtm7g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Charles Yeh , Johan Hovold Subject: [PATCH 5.10 496/663] USB: serial: pl2303: fix line-speed handling on newer chips Date: Mon, 1 Mar 2021 17:12:24 +0100 Message-Id: <20210301161206.387314281@linuxfoundation.org> X-Mailer: git-send-email 2.30.1 In-Reply-To: <20210301161141.760350206@linuxfoundation.org> References: <20210301161141.760350206@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Johan Hovold commit 979d9cbe75b922ab1695b8ad5576115774f72e62 upstream. The latest chip family (HXN) apparently does not support setting the line speed using divisors and instead needs to use the direct encoding scheme for all rates. This specifically enables 50, 110, 134, 200 bps and other rates not supported by the original chip type. Fixes: ebd09f1cd417 ("USB: serial: pl2303: add support for PL2303HXN") Cc: stable@vger.kernel.org # 5.5 Cc: Charles Yeh Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/pl2303.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/usb/serial/pl2303.c +++ b/drivers/usb/serial/pl2303.c @@ -183,6 +183,7 @@ struct pl2303_type_data { speed_t max_baud_rate; unsigned long quirks; unsigned int no_autoxonxoff:1; + unsigned int no_divisors:1; }; struct pl2303_serial_private { @@ -209,6 +210,7 @@ static const struct pl2303_type_data pl2 }, [TYPE_HXN] = { .max_baud_rate = 12000000, + .no_divisors = true, }, }; @@ -571,8 +573,12 @@ static void pl2303_encode_baud_rate(stru baud = min_t(speed_t, baud, spriv->type->max_baud_rate); /* * Use direct method for supported baud rates, otherwise use divisors. + * Newer chip types do not support divisor encoding. */ - baud_sup = pl2303_get_supported_baud_rate(baud); + if (spriv->type->no_divisors) + baud_sup = baud; + else + baud_sup = pl2303_get_supported_baud_rate(baud); if (baud == baud_sup) baud = pl2303_encode_baud_rate_direct(buf, baud);