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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 7A2A6C33CAF for ; Thu, 16 Jan 2020 17:39:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 461FD24708 for ; Thu, 16 Jan 2020 17:39:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579196394; bh=o3C1UqRWBfZVIx0bzO1LlqfFxxEUFh+GSgJl8fNvMHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=T4zG70ZbGU3439ey19+MVb1csZDftJz+GXMPJZa6bTU39OT/qQ6laiY8/dDRZ9FaR QpIlFIPA6lcJafqG+1MhePh3H5a0gGZhqcSSh+ouRo3Gb7COqLJwp8y9lPh1IxSvZJ 2B7bmW+lftAS+qSnSz4YfW0Qwad9MDf+HvRk9znw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393546AbgAPRjx (ORCPT ); Thu, 16 Jan 2020 12:39:53 -0500 Received: from mail.kernel.org ([198.145.29.99]:55072 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390428AbgAPRjC (ORCPT ); Thu, 16 Jan 2020 12:39:02 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5ACEC246D3; Thu, 16 Jan 2020 17:39:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579196341; bh=o3C1UqRWBfZVIx0bzO1LlqfFxxEUFh+GSgJl8fNvMHs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fZm6Szib2cphewupuzqjmmVY6NbK5TKE2x12bp5cGAtlZTTVwBnP60a/foaoT9Nx1 YYuRY5c9ZAtKMl7/j4CAHW0qfzAfCn3MKhM4rhut0wcEoszE0iNtWMsCbkutl6bdhp CIbW7Mp7Rk7AGaj8juApiT1HnzmI+H2uofL1QkLc= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Bichao Zheng , Martin Blumenstingl , Neil Armstrong , Thierry Reding , Sasha Levin , linux-pwm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org Subject: [PATCH AUTOSEL 4.9 138/251] pwm: meson: Don't disable PWM when setting duty repeatedly Date: Thu, 16 Jan 2020 12:34:47 -0500 Message-Id: <20200116173641.22137-98-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116173641.22137-1-sashal@kernel.org> References: <20200116173641.22137-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bichao Zheng [ Upstream commit a279345807e1e0ae79567a52cfdd9d30c9174a3c ] There is an abnormally low about 20ms,when setting duty repeatedly. Because setting the duty will disable PWM and then enable. Delete this operation now. Fixes: 211ed630753d2f ("pwm: Add support for Meson PWM Controller") Signed-off-by: Bichao Zheng [ Dropped code instead of hiding it behind a comment ] Signed-off-by: Martin Blumenstingl Reviewed-by: Neil Armstrong Signed-off-by: Thierry Reding Signed-off-by: Sasha Levin --- drivers/pwm/pwm-meson.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index f58a4867b519..a196439ee14c 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -320,11 +320,6 @@ static int meson_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, if (state->period != channel->state.period || state->duty_cycle != channel->state.duty_cycle || state->polarity != channel->state.polarity) { - if (channel->state.enabled) { - meson_pwm_disable(meson, pwm->hwpwm); - channel->state.enabled = false; - } - if (state->polarity != channel->state.polarity) { if (state->polarity == PWM_POLARITY_NORMAL) meson->inverter_mask |= BIT(pwm->hwpwm); -- 2.20.1