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=-10.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,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 CE16EC33CB6 for ; Thu, 16 Jan 2020 17:22:08 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id A006B2468D for ; Thu, 16 Jan 2020 17:22:08 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="uhA5+dNW"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="XTiYYdLO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A006B2468D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ySKIzguvSKSoeFO0SikLnR9vBlaucrCIw+ij0PqfUPk=; b=uhA5+dNWvkMgDT 9o53h34DuYqbCGjglDPLLeMqJIL0OPhGbbF5Vi/CPppwptXDxVfW9D7eNfIkQk8h5i755rFAcL6ki 1zY8yT5RGFIDGiexh+klfXxe7M1lkcgCUEsfiLY3NSghvjXYeLdp/0oOA8z7RVVCzJGYOdetcDPW1 tM093SqNT5jNxdF1rG/tRRd6AdSLmyMz8pmIfskZRjHdCR+7BXKy5BeaoZoN9crQRMz+FOTmHHqsu NSQa4eUZDvPgfg2uZAxwirX+UP5aCth9VVOmCh7XimoLrfhPVQeP2iAro9mL7cykfu/SYbltrdJGj LHFhQYm0ukd3C6caSvbQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1is8qL-0007r8-PR; Thu, 16 Jan 2020 17:22:05 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1is8c2-0000Ny-Ht; Thu, 16 Jan 2020 17:07:22 +0000 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 BDCCD20663; Thu, 16 Jan 2020 17:07:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1579194437; bh=C7GWMH4e8A+00KK7ertF2ir/PvFAXPbJTUdWcrjSCdQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XTiYYdLO4saJtXbaXGO1UcOG28/HiZNQFl+im+BBBcSR+FJNkvr141s/IjK+4SB9Q x+RP72Ss86l10Fn5PZf5gQl/eOd7jVGHVWN8Tem9tBAxyi+gBTEsXViWvFJzXRlQ4y CMaW4eJeGxaVLR4bD4+zSyt2sqppyg3Xlx8bbWZg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 351/671] pwm: meson: Don't disable PWM when setting duty repeatedly Date: Thu, 16 Jan 2020 11:59:49 -0500 Message-Id: <20200116170509.12787-88-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200116170509.12787-1-sashal@kernel.org> References: <20200116170509.12787-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200116_090718_649211_B6CFB00E X-CRM114-Status: UNSURE ( 9.23 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , linux-pwm@vger.kernel.org, Neil Armstrong , Martin Blumenstingl , Bichao Zheng , Thierry Reding , linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.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 4b708c1fcb1d..e247ab632530 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -325,11 +325,6 @@ 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel