From patchwork Sat Nov 12 21:21:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Gabriel L. Somlo" X-Patchwork-Id: 624545 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 04299C433FE for ; Sat, 12 Nov 2022 21:22:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235146AbiKLVV4 (ORCPT ); Sat, 12 Nov 2022 16:21:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53768 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235092AbiKLVVl (ORCPT ); Sat, 12 Nov 2022 16:21:41 -0500 Received: from mail-qt1-x82f.google.com (mail-qt1-x82f.google.com [IPv6:2607:f8b0:4864:20::82f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8F2B715A1D; Sat, 12 Nov 2022 13:21:39 -0800 (PST) Received: by mail-qt1-x82f.google.com with SMTP id l15so4874485qtv.4; Sat, 12 Nov 2022 13:21:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=lj3jgN94Up18U7wVvpj0Zgp4+ZbcXYE4CuLEGeta7KA=; b=hT5YiZaCxVZ1nPy9zMoXb3qQqnPNsZ7o9pju+19OsVVMRh096IvhsGw3wrI3WyLprx qdPk33wgAo8ELhrFTjh2rJ6nwlND9hL1trHMue0kGpziwDe/aXDdF5A2OAztsgcbx0KP Devs53QoRNOxuZgtr9LpArCBscEp1EFIfWc+Wyv3CtrjVMAZaawDoetYCdxvKkAIXK+p 9bltTnJY5s/ewqlCSBZchvfwRncppJ3X2Q13ZUWTkSl1J1V1hikyiJ7EuSqzDPfs6J42 fk4qATFyjlt2NIP+fFBwR1ezjd70Ex5775RmWUNZKvqFjJYSuQJMGm3sO+iqGRD2Oco2 2lVA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lj3jgN94Up18U7wVvpj0Zgp4+ZbcXYE4CuLEGeta7KA=; b=esRuAhsIkXxasbv3VU+/CPPofmVzwoyrT/cBYNwuG1l0SpbpwmrQwVsv5YZwFv8Kw6 Dx1rD15Y3z4JMOB/7pozgKyzADyOOM8ptoM3ziK93ncBMae2Gg57FgwzkabPVPo+DvMg S3v4SzG4nosa8KPjigJKEg10yGTaqGVs2sOVD9aN4hsUMDRDZNGn8z9x7NxFIRgM9o8r PsDyChdt2w32tlGISkXUf2Tx7BKSI0vYykpapOmaywcVi22C50jp4Lsn0J58pkomD4VE 8SeZ5l0VDM28AVPm+4FR4bxNVkkgxdPqN6EXi4uRi+4xUcwekd8Y+RodIwQzqWV5FIae 8oyQ== X-Gm-Message-State: ANoB5pnrD9wbFNQv0L+A565zHMdQeLMGTE0WMvhSeuPQYqcjgRnRvxZz VyNcmTzY6vLVGV4DgOvyeA9W1LnBTwAYHQ== X-Google-Smtp-Source: AA0mqf776Ls7iEIplNJANnecNoE8bcN5Xr/bW7Ap/UWRiwTpsId1B0vgXlwLHmLHMKf0ePUo0KQbfg== X-Received: by 2002:ac8:474b:0:b0:3a5:177d:d9cb with SMTP id k11-20020ac8474b000000b003a5177dd9cbmr6770535qtp.64.1668288098440; Sat, 12 Nov 2022 13:21:38 -0800 (PST) Received: from glsvmlin.ini.cmu.edu (GLSVMLIN.INI.CMU.EDU. [128.2.16.9]) by smtp.gmail.com with ESMTPSA id t8-20020a37ea08000000b006fa313bf185sm3811839qkj.8.2022.11.12.13.21.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 12 Nov 2022 13:21:38 -0800 (PST) From: Gabriel Somlo To: linux-kernel@vger.kernel.org Cc: linux-serial@vger.kernel.org, gregkh@linuxfoundation.org, jirislaby@kernel.org, kgugala@antmicro.com, mholenko@antmicro.com, joel@jms.id.au, david.abdurachmanov@gmail.com, florent@enjoy-digital.fr, geert@linux-m68k.org Subject: [PATCH v3 07/14] serial: liteuart: rx loop should only ack rx events Date: Sat, 12 Nov 2022 16:21:18 -0500 Message-Id: <20221112212125.448824-8-gsomlo@gmail.com> X-Mailer: git-send-email 2.37.3 In-Reply-To: <20221112212125.448824-1-gsomlo@gmail.com> References: <20221112212125.448824-1-gsomlo@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-serial@vger.kernel.org While receiving characters, it is necessary to acknowledge each one by writing to the EV_PENDING register's EV_RX bit. Ensure we do not also gratuitously set the EV_TX bit in the process. Signed-off-by: Gabriel Somlo --- drivers/tty/serial/liteuart.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/tty/serial/liteuart.c b/drivers/tty/serial/liteuart.c index ff3486860989..b5ab48aa35cf 100644 --- a/drivers/tty/serial/liteuart.c +++ b/drivers/tty/serial/liteuart.c @@ -81,7 +81,7 @@ static void liteuart_timer(struct timer_list *t) port->icount.rx++; /* necessary for RXEMPTY to refresh its value */ - litex_write8(membase + OFF_EV_PENDING, EV_TX | EV_RX); + litex_write8(membase + OFF_EV_PENDING, EV_RX); /* no overflow bits in status */ if (!(uart_handle_sysrq_char(port, ch)))