From patchwork Tue May 17 14:26:16 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Stein X-Patchwork-Id: 1632403 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: bilbo.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=tq-group.com header.i=@tq-group.com header.a=rsa-sha256 header.s=key1 header.b=mQd+rkZe; dkim=pass (2048-bit key) header.d=tq-group.com header.i=@tq-group.com header.a=rsa-sha256 header.s=key1 header.b=qXgFBIDR; dkim-atps=neutral Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=2620:137:e000::1:20; helo=out1.vger.email; envelope-from=linux-pwm-owner@vger.kernel.org; receiver=) Received: from out1.vger.email (out1.vger.email [IPv6:2620:137:e000::1:20]) by bilbo.ozlabs.org (Postfix) with ESMTP id 4L2djT0wpYz9s5V for ; Wed, 18 May 2022 00:26:53 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348881AbiEQO0w (ORCPT ); Tue, 17 May 2022 10:26:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239516AbiEQO0s (ORCPT ); Tue, 17 May 2022 10:26:48 -0400 Received: from mx1.tq-group.com (mx1.tq-group.com [93.104.207.81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5BB742A31; Tue, 17 May 2022 07:26:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1652797607; x=1684333607; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RHY+Uqy+B8OW1co9+ZEM3AZ7L4FCao6DaFnGqdfR86A=; b=mQd+rkZebzMbWIOQQYcdi+AWYK4XPD79LPq2hZeM9ClC5XgNjJ9Sa5pR 3Rcz4GvKQZYUr2MxZktM1Eg3h5BjP1SI+aMYWTYR6BTe21HKqmNjZa3Ka dosYB9/Px/fV9Xz/5FyXtHotTI4dVar3zsOJDsHZg6QhSAP8ppXBxIvAK p185KaT7nQQI6w2geZKKa1fYvQKAzFMARFyjcwxyEmAB1H460MWP5b+4I SZY+wkKIwuSzTdmi8xq2Otvq+1MhwAa/Gp86TrnNWivYJvciBrAqsTMtA U9xzCmgLDSUkWawbRG5k32b5twNsjZHlBTiTv8eelvMHpcI76gMPSB66+ w==; X-IronPort-AV: E=Sophos;i="5.91,233,1647298800"; d="scan'208";a="23925938" Received: from unknown (HELO tq-pgp-pr1.tq-net.de) ([192.168.6.15]) by mx1-pgp.tq-group.com with ESMTP; 17 May 2022 16:26:35 +0200 Received: from mx1.tq-group.com ([192.168.6.7]) by tq-pgp-pr1.tq-net.de (PGP Universal service); Tue, 17 May 2022 16:26:35 +0200 X-PGP-Universal: processed; by tq-pgp-pr1.tq-net.de on Tue, 17 May 2022 16:26:35 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tq-group.com; i=@tq-group.com; q=dns/txt; s=key1; t=1652797595; x=1684333595; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=RHY+Uqy+B8OW1co9+ZEM3AZ7L4FCao6DaFnGqdfR86A=; b=qXgFBIDR3R7e/MpZ3qn1frxZWSFXS8hGSgppNcJC6CAjSyD6Ravt3v5t FC9p+H7ull8G+5gwMouePzxrVIBsLFJuNUSRahRjbv8Fn+W4pkDdZeySC 1sVSak2LbVvPIX39H0xx0Dnjxm3A5InBh9cDvmKRQU3YnbSsDOQr4gxVm QSmIloHen9bXkPEAceU0jpA5Gc18h5NbGr2cEoNNSkKIFxC+D7b0Zwbqo AbsidZYxlCFUB1hhH4mYsdAYmsmvu70B6fAeTMzXsNTSTHHVSmtkDKzDm ZQoJ2si8+3yu1Ad4lR51n0WyF7GAvCdBRDVk/E7+j3qIOv2nkXjhlKy50 w==; X-IronPort-AV: E=Sophos;i="5.91,233,1647298800"; d="scan'208";a="23925929" Received: from vtuxmail01.tq-net.de ([10.115.0.20]) by mx1.tq-group.com with ESMTP; 17 May 2022 16:26:25 +0200 Received: from steina-w.tq-net.de (unknown [10.123.49.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) by vtuxmail01.tq-net.de (Postfix) with ESMTPSA id 648A0280078; Tue, 17 May 2022 16:26:25 +0200 (CEST) From: Alexander Stein To: Bartlomiej Zolnierkiewicz , Jean Delvare , Guenter Roeck , Jonathan Corbet , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Lee Jones Cc: Alexander Stein , linux-hwmon@vger.kernel.org, linux-pwm@vger.kernel.org, Markus Niebel Subject: [PATCH v3 2/6] hwmon: pwm-fan: Simplify enable/disable check Date: Tue, 17 May 2022 16:26:16 +0200 Message-Id: <20220517142620.1523143-3-alexander.stein@ew.tq-group.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220517142620.1523143-1-alexander.stein@ew.tq-group.com> References: <20220517142620.1523143-1-alexander.stein@ew.tq-group.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Instead of comparing the current to the new pwm duty to decide whether to enable the PWM, use a dedicated flag. Also apply the new PWM duty in any case. This is a preparation to enable/disable the regulator dynamically. Signed-off-by: Alexander Stein --- drivers/hwmon/pwm-fan.c | 37 +++++++++++++++++++++++++++++-------- 1 file changed, 29 insertions(+), 8 deletions(-) diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 458914d01155..2b7b26ab9b88 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -29,10 +29,13 @@ struct pwm_fan_tach { }; struct pwm_fan_ctx { + struct device *dev; + struct mutex lock; struct pwm_device *pwm; struct pwm_state pwm_state; struct regulator *reg_en; + bool enabled; int tach_count; struct pwm_fan_tach *tachs; @@ -85,14 +88,21 @@ static void sample_timer(struct timer_list *t) static int pwm_fan_power_on(struct pwm_fan_ctx *ctx) { struct pwm_state *state = &ctx->pwm_state; - unsigned long period; int ret; - period = state->period; - state->duty_cycle = DIV_ROUND_UP(ctx->pwm_value * (period - 1), MAX_PWM); + if (ctx->enabled) + return 0; + state->enabled = true; ret = pwm_apply_state(ctx->pwm, state); + if (ret) { + dev_err(ctx->dev, "failed to enable PWM\n"); + goto err; + } + ctx->enabled = true; + +err: return ret; } @@ -100,26 +110,36 @@ static int pwm_fan_power_off(struct pwm_fan_ctx *ctx) { struct pwm_state state; + if (!ctx->enabled) + return 0; + state.enabled = false; state.duty_cycle = 0; pwm_apply_state(ctx->pwm, &state); + ctx->enabled = false; + return 0; } static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) { + struct pwm_state *state = &ctx->pwm_state; + unsigned long period; int ret = 0; mutex_lock(&ctx->lock); - if (ctx->pwm_value == pwm) - goto exit_set_pwm_err; - if (pwm > 0) + if (pwm > 0) { + period = state->period; + state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM); + ret = pwm_apply_state(ctx->pwm, state); + if (ret) + goto exit_set_pwm_err; ret = pwm_fan_power_on(ctx); - else + } else { ret = pwm_fan_power_off(ctx); - + } if (!ret) ctx->pwm_value = pwm; @@ -326,6 +346,7 @@ static int pwm_fan_probe(struct platform_device *pdev) mutex_init(&ctx->lock); + ctx->dev = &pdev->dev; ctx->pwm = devm_of_pwm_get(dev, dev->of_node, NULL); if (IS_ERR(ctx->pwm)) return dev_err_probe(dev, PTR_ERR(ctx->pwm), "Could not get PWM\n");