From patchwork Fri Jun 2 10:32:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: George Stark X-Patchwork-Id: 13265075 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 9D84DC7EE29 for ; Fri, 2 Jun 2023 10:33:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=X7yHdVPqmBVfRf7STB7g8L3AXdHW61gVSLx05iu3oMk=; b=obw2c286z0K1I4 uk09XAa8tQdc5zEADLzAxfoF18oSoycFb0je1LIlcDGQV70JpwTtpxU4aXMyDP3rdE1dXDcK/Dhzo /xZpNr3E5k6k7IGvB3pX6dQrC8xRrDuH6ZXNnZhihrC+38bWMaketkK96OfRu9PFSBd1BHHx5Hby4 vPLqneEjsgJM+CRpyZuLbE1n4GtCv7wpFYnccNCNBqtIxoEgeSZF6/CUKPBjTOUBHxdwoASVV4Zwb MMYPXXHk8OKsTjKzeWwxugT+AvLoCmFluCHgGIYW/dvyWenN6Pi2ITwwlDlzFjnKZw6g+vONj2ltw UStx8KYt+aLJan07bdVg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q525K-006XIy-0h; Fri, 02 Jun 2023 10:32:42 +0000 Received: from mx.sberdevices.ru ([45.89.227.171]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q525G-006XHp-0y; Fri, 02 Jun 2023 10:32:40 +0000 Received: from s-lin-edge02.sberdevices.ru (localhost [127.0.0.1]) by mx.sberdevices.ru (Postfix) with ESMTP id 2390C5FD03; Fri, 2 Jun 2023 13:32:30 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sberdevices.ru; s=mail; t=1685701950; bh=U2UnoUMYRs9m/BLycNQ2iLq6bQeVm56LTFKDcGw5E4A=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=dDpfb4nspYq2IX79ggRqGaSgsWFxQt9B9+ivAjCuKkPYK+q/bDLe82NvRXQUIoP+J 1UgfCSEnRVAf5ne/aOauc+fEm69F8FQcHNj3jabszSu48HnRuxfrN2df70IxJudXUL EbvNvDia+9mnO4Yc2jgEksvdVUhgVqGchpdhHZ3m6PqX55BggvX0jUK6f9Y8poxFpZ cWQX7YPm52iN0PKBRwsknc5qKJgZX6pM4h4ofywpJyYrEW003YvZ8+H+HYySWIge0D wMaJq5LKgKm+TuCkbyW0xzWe44pGE7/VvS1mPdJvdQtxM6Wr43p6CZh8SGtVssXyPz w2WiIR79N/Yvg== Received: from S-MS-EXCH01.sberdevices.ru (S-MS-EXCH01.sberdevices.ru [172.16.1.4]) by mx.sberdevices.ru (Postfix) with ESMTP; Fri, 2 Jun 2023 13:32:29 +0300 (MSK) From: George Stark To: , , , , , , CC: , , , , , George Stark , Dmitry Rokosov Subject: [PATCH] pwm: meson: compute cnt register value in proper way Date: Fri, 2 Jun 2023 13:32:11 +0300 Message-ID: <20230602103211.2199283-1-gnstark@sberdevices.ru> X-Mailer: git-send-email 2.40.1 MIME-Version: 1.0 X-Originating-IP: [172.16.1.6] X-ClientProxiedBy: S-MS-EXCH02.sberdevices.ru (172.16.1.5) To S-MS-EXCH01.sberdevices.ru (172.16.1.4) X-KSMG-Rule-ID: 4 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Status: not scanned, disabled by settings X-KSMG-AntiSpam-Interceptor-Info: not scanned X-KSMG-AntiPhishing: not scanned, disabled by settings X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2023/06/02 03:06:00 #21401484 X-KSMG-AntiVirus-Status: Clean, skipped X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230602_033238_863198_729059D9 X-CRM114-Status: UNSURE ( 8.04 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org According to the datasheet, the PWM high and low clock count values should be set to at least one. Therefore, setting the clock count register to 0 actually means 1 clock count. Signed-off-by: George Stark Signed-off-by: Dmitry Rokosov --- This patch is based on currently unmerged patch by Heiner Kallweit https://lore.kernel.org/linux-amlogic/23fe625e-dc23-4db8-3dce-83167cd3b206@gmail.com --- diff --git a/drivers/pwm/pwm-meson.c b/drivers/pwm/pwm-meson.c index 834acd7..57e7d9c 100644 --- a/drivers/pwm/pwm-meson.c +++ b/drivers/pwm/pwm-meson.c @@ -206,6 +206,11 @@ channel->pre_div = pre_div; channel->hi = duty_cnt; channel->lo = cnt - duty_cnt; + + if (channel->hi) + channel->hi--; + if (channel->lo) + channel->lo--; } return 0; @@ -340,7 +345,8 @@ channel->lo = FIELD_GET(PWM_LOW_MASK, value); channel->hi = FIELD_GET(PWM_HIGH_MASK, value); - state->period = meson_pwm_cnt_to_ns(chip, pwm, channel->lo + channel->hi); + state->period = meson_pwm_cnt_to_ns(chip, pwm, + channel->lo + 1 + channel->hi + 1); state->duty_cycle = meson_pwm_cnt_to_ns(chip, pwm, channel->hi); return 0;