From patchwork Tue Sep 14 15:18:09 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 77007 X-Patchwork-Delegate: sean@mess.org Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1mQACT-00A0a0-EF; Tue, 14 Sep 2021 15:18:21 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234826AbhINPTe (ORCPT + 1 other); Tue, 14 Sep 2021 11:19:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234779AbhINPTb (ORCPT ); Tue, 14 Sep 2021 11:19:31 -0400 Received: from gofer.mess.org (gofer.mess.org [IPv6:2a02:8011:d000:212::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6857BC0613C1; Tue, 14 Sep 2021 08:18:12 -0700 (PDT) Received: by gofer.mess.org (Postfix, from userid 1000) id 90BDEC65BA; Tue, 14 Sep 2021 16:18:09 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=mess.org; s=2020; t=1631632689; bh=WksOAXceADQojSv7D9XcocopFCjz8Htoqezgrn7HtWc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=M5H+5QxlrjRGQv24cWyMdIBqxOCO7NaO8FYzva+CkR/axoNrE5Lr4uZWg8I3n8lpY oC54a1MlTaKcQOI5uPX5Fu4GnrTV/ZOxSu0UbnticgsaNCWJDSUU12HT5lErQn5JaW lkmTgwRV7bhqGFK7qqvd73/dOCSdrhfh50wQD+Xy5HCF2OUt6OVlFio+kl42YSXeFl LL+QPnkiEvOysBeaNg9kLdSrOLLJakR4k34ZT2sr1Xu5uhoS+d98nOmNptgJP1+QnO BqH0EhwgQ/oSU5PxLDV7gLe2BdqyfrAEYZCBnMjLtQAsxvmX1HgUCm17AZY8B8kGJU GA12pd5h85Plw== From: Sean Young To: linux-media@vger.kernel.org Cc: Georgi Bakalski , stable@vger.kernel.org Subject: [PATCH 4/4] media: ir_toy: prevent device from hanging during transmit Date: Tue, 14 Sep 2021 16:18:09 +0100 Message-Id: <4ed68b6848f09f191e0709702c3d1d7838a3a717.1631632442.git.sean@mess.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <22eeae667aac9d5eaaae2f21904f238ebef0c05b.1631632442.git.sean@mess.org> References: <22eeae667aac9d5eaaae2f21904f238ebef0c05b.1631632442.git.sean@mess.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -4.6 (----) X-LSpam-Report: No, score=-4.6 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1,RCVD_IN_DNSWL_MED=-2.3,T_DKIM_INVALID=0.01 autolearn=ham autolearn_force=no If the IR Toy is receiving IR while a transmit is done, it may end up hanging. We can prevent this from happening by re-entering sample mode just before issuing the transmit command. Link: https://github.com/bengtmartensson/HarcHardware/discussions/25 Cc: stable@vger.kernel.org Signed-off-by: Sean Young --- drivers/media/rc/ir_toy.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/media/rc/ir_toy.c b/drivers/media/rc/ir_toy.c index d2d9346eb8f5..71aced52248f 100644 --- a/drivers/media/rc/ir_toy.c +++ b/drivers/media/rc/ir_toy.c @@ -26,6 +26,7 @@ static const u8 COMMAND_VERSION[] = { 'v' }; // End transmit and repeat reset command so we exit sump mode static const u8 COMMAND_RESET[] = { 0xff, 0xff, 0, 0, 0, 0, 0 }; static const u8 COMMAND_SMODE_ENTER[] = { 's' }; +static const u8 COMMAND_SMODE_EXIT[] = { 0 }; static const u8 COMMAND_TXSTART[] = { 0x26, 0x24, 0x25, 0x03 }; #define REPLY_XMITCOUNT 't' @@ -317,12 +318,30 @@ static int irtoy_tx(struct rc_dev *rc, uint *txbuf, uint count) buf[i] = cpu_to_be16(v); } - buf[count] = cpu_to_be16(0xffff); + buf[count] = 0xffff; irtoy->tx_buf = buf; irtoy->tx_len = size; irtoy->emitted = 0; + // There is an issue where if the unit is receiving IR while the + // first TXSTART command is sent, the device might end up hanging + // with its led on. It does not respond to any command when this + // happens. To work around this, re-enter sample mode. + err = irtoy_command(irtoy, COMMAND_SMODE_EXIT, + sizeof(COMMAND_SMODE_EXIT), STATE_COMMAND_NO_RESP); + if (err) { + dev_err(irtoy->dev, "exit sample mode: %d\n", err); + return err; + } + + err = irtoy_command(irtoy, COMMAND_SMODE_ENTER, + sizeof(COMMAND_SMODE_ENTER), STATE_COMMAND); + if (err) { + dev_err(irtoy->dev, "enter sample mode: %d\n", err); + return err; + } + err = irtoy_command(irtoy, COMMAND_TXSTART, sizeof(COMMAND_TXSTART), STATE_TX); kfree(buf);