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 13391E7C4E9 for ; Wed, 4 Oct 2023 18:33:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244381AbjJDSdc (ORCPT ); Wed, 4 Oct 2023 14:33:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39826 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244385AbjJDSdb (ORCPT ); Wed, 4 Oct 2023 14:33:31 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A0817AD for ; Wed, 4 Oct 2023 11:33:28 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0051C433C7; Wed, 4 Oct 2023 18:33:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1696444408; bh=GlOyA4DV6DaLZgzsGgfkotpTtO+FE/MsIqty39FtQNE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bq9PDavUyu1H4KNjW9XlIMMfRV7y9cGasIS00+uqkVvPmeNy9yWz2z9nd6v9coLtZ jS+f25oIuRTxQqyISBdpAZ8woYunpJlsX6ArNSju2gdUoibw1VzqhvUXBL0I9GI9uo GxphIzATMrOYKWXXLTuoiBV7DbA/XrjE4KA+Vyiw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Richard Fitzgerald , Stefan Binding , Mark Brown , Sasha Levin Subject: [PATCH 6.5 212/321] ASoC: cs42l42: Ensure a reset pulse meets minimum pulse width. Date: Wed, 4 Oct 2023 19:55:57 +0200 Message-ID: <20231004175239.075709613@linuxfoundation.org> X-Mailer: git-send-email 2.42.0 In-Reply-To: <20231004175229.211487444@linuxfoundation.org> References: <20231004175229.211487444@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 6.5-stable review patch. If anyone has any objections, please let me know. ------------------ From: Richard Fitzgerald [ Upstream commit 41dac81b56c82c51a6d00fda5f3af7691ffee2d7 ] The CS42L42 can accept very short reset pulses of a few microseconds but there's no reason to force a very short pulse. Allow a wide range for the usleep_range() so it can be relaxed about the choice of timing source. Signed-off-by: Richard Fitzgerald Signed-off-by: Stefan Binding Link: https://lore.kernel.org/r/20230913150012.604775-2-sbinding@opensource.cirrus.com Signed-off-by: Mark Brown Signed-off-by: Sasha Levin --- sound/soc/codecs/cs42l42.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/sound/soc/codecs/cs42l42.c b/sound/soc/codecs/cs42l42.c index a0de0329406a1..56d2857a4f01c 100644 --- a/sound/soc/codecs/cs42l42.c +++ b/sound/soc/codecs/cs42l42.c @@ -2320,6 +2320,10 @@ int cs42l42_common_probe(struct cs42l42_private *cs42l42, if (cs42l42->reset_gpio) { dev_dbg(cs42l42->dev, "Found reset GPIO\n"); + + /* Ensure minimum reset pulse width */ + usleep_range(10, 500); + gpiod_set_value_cansleep(cs42l42->reset_gpio, 1); } usleep_range(CS42L42_BOOT_TIME_US, CS42L42_BOOT_TIME_US * 2); -- 2.40.1