From patchwork Tue Nov 21 20:28:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dmitry Rokosov X-Patchwork-Id: 746307 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=salutedevices.com header.i=@salutedevices.com header.b="bCxCluAN" Received: from mx1.sberdevices.ru (mx2.sberdevices.ru [45.89.224.132]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 77B8619E; Tue, 21 Nov 2023 12:28:55 -0800 (PST) Received: from p-infra-ksmg-sc-msk02 (localhost [127.0.0.1]) by mx1.sberdevices.ru (Postfix) with ESMTP id 1CFCC120063; Tue, 21 Nov 2023 23:28:54 +0300 (MSK) DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.sberdevices.ru 1CFCC120063 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=salutedevices.com; s=mail; t=1700598534; bh=ZssAi5WdNtQCPcb5QdmdyeQtMwsDcqRERVND2eAlJLk=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type:From; b=bCxCluAN3CZio71JN1IwWPEdslmCeOIF7AxTkHGxDerSSXU/TSWkXITbd9ZrZXvM9 klro9CnmHMVCgG7CqDt7ghQyEu7M9BcRUkvuInalUusY+1Hs83gS9xPnDb3sbgZ7oN VtVfhIAx6AeLyhm0N9Q9aG4XdBdVVt6IwHdoWG3/d6iWJfRhH1zo7dPzE1M8zYeAG/ k1YmXMYojp5O0RBwT3WVs0lwdrVB6PrURo+sBMe80eQbwMBm82GxbeJ6vyDr6uO5BE AyerZRe79Vlig0Xs25tgua92R05Jb8vEiWHuyw2Q9MMEhEau41VYsIF9T9XajxdoFb /5TPTkZ2WBc1w== Received: from p-i-exch-sc-m01.sberdevices.ru (p-i-exch-sc-m01.sberdevices.ru [172.16.192.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.sberdevices.ru (Postfix) with ESMTPS; Tue, 21 Nov 2023 23:28:53 +0300 (MSK) Received: from localhost.localdomain (100.64.160.123) by p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.40; Tue, 21 Nov 2023 23:28:53 +0300 From: Dmitry Rokosov To: , , , , , CC: , , , , , George Stark , Dmitry Rokosov Subject: [PATCH v4 08/11] leds: aw200xx: improve autodim calculation method Date: Tue, 21 Nov 2023 23:28:32 +0300 Message-ID: <20231121202835.28152-9-ddrokosov@salutedevices.com> X-Mailer: git-send-email 2.36.0 In-Reply-To: <20231121202835.28152-1-ddrokosov@salutedevices.com> References: <20231121202835.28152-1-ddrokosov@salutedevices.com> Precedence: bulk X-Mailing-List: linux-leds@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) To p-i-exch-sc-m01.sberdevices.ru (172.16.192.107) X-KSMG-Rule-ID: 10 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 181514 [Nov 21 2023] X-KSMG-AntiSpam-Version: 6.0.0.2 X-KSMG-AntiSpam-Envelope-From: ddrokosov@salutedevices.com X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 3 0.3.3 e5c6a18a9a9bff0226d530c5b790210c0bd117c8, {Tracking_from_domain_doesnt_match_to}, 100.64.160.123:7.1.2; 127.0.0.199:7.1.2; p-i-exch-sc-m01.sberdevices.ru:5.0.1,7.1.1; salutedevices.com:7.1.1; d41d8cd98f00b204e9800998ecf8427e.com:7.1.1, FromAlignment: s, ApMailHostAddress: 100.64.160.123 X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean X-KSMG-LinksScanning: Clean X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 2.0.1.6960, bases: 2023/11/21 17:47:00 #22495004 X-KSMG-AntiVirus-Status: Clean, skipped From: George Stark It is highly recommended to leverage the DIV_ROUND_UP() function as a more refined and mathematically precise alternative to employing a coarse division method. Signed-off-by: George Stark Signed-off-by: Dmitry Rokosov Reviewed-by: Andy Shevchenko --- drivers/leds/leds-aw200xx.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/leds/leds-aw200xx.c b/drivers/leds/leds-aw200xx.c index 4c83d4979cf5..c48aa11fd411 100644 --- a/drivers/leds/leds-aw200xx.c +++ b/drivers/leds/leds-aw200xx.c @@ -87,6 +87,8 @@ #define AW200XX_REG_DIM(x, columns) \ AW200XX_REG(AW200XX_PAGE4, AW200XX_LED2REG(x, columns) * 2) #define AW200XX_REG_DIM2FADE(x) ((x) + 1) +#define AW200XX_REG_FADE2DIM(fade) \ + DIV_ROUND_UP((fade) * AW200XX_DIM_MAX, AW200XX_FADE_MAX) /* * Duty ratio of display scan (see p.15 of datasheet for formula): @@ -195,9 +197,7 @@ static int aw200xx_brightness_set(struct led_classdev *cdev, dim = led->dim; if (dim < 0) - dim = max_t(int, - brightness / (AW200XX_FADE_MAX / AW200XX_DIM_MAX), - 1); + dim = AW200XX_REG_FADE2DIM(brightness); ret = regmap_write(chip->regmap, reg, dim); if (ret) @@ -460,6 +460,7 @@ static int aw200xx_probe_fw(struct device *dev, struct aw200xx *chip) led->num = source; led->chip = chip; led->cdev.brightness_set_blocking = aw200xx_brightness_set; + led->cdev.max_brightness = AW200XX_FADE_MAX; led->cdev.groups = dim_groups; init_data.fwnode = child;