From patchwork Thu Sep 3 11:23:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 11753301 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4F9AD722 for ; Thu, 3 Sep 2020 11:24:45 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 2DFEC2087C for ; Thu, 3 Sep 2020 11:24:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="OYQFpV4u" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2DFEC2087C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 6150D6E9C5; Thu, 3 Sep 2020 11:24:44 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from us-smtp-delivery-1.mimecast.com (us-smtp-2.mimecast.com [205.139.110.61]) by gabe.freedesktop.org (Postfix) with ESMTPS id 872FD6E9C5 for ; Thu, 3 Sep 2020 11:24:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599132282; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BihA1BpHNAPbZmr7utm+7lcBoH9ReI2g/yHAfDzPOZk=; b=OYQFpV4uJalEEn2AIyB5Gh9cWlkZFZYA3z1SclVSjAeyWD34QzQ8L90vch0l4B8KsYZ7Oz onsl7sb07KdRFBXVgGy9V3tv3ikPEwRYKmBVHl70qLXtMNaTd7zP98mimFrmZu7RWSFC+o jBmklVYktPaHwFbMlzDP90z3yWWRYu4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-86-EHjOs5jPN_eBJa0VFXdbgA-1; Thu, 03 Sep 2020 07:24:40 -0400 X-MC-Unique: EHjOs5jPN_eBJa0VFXdbgA-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D353910ABDD1; Thu, 3 Sep 2020 11:24:35 +0000 (UTC) Received: from x1.localdomain (ovpn-113-3.ams2.redhat.com [10.36.113.3]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3B8FF5C1C2; Thu, 3 Sep 2020 11:24:32 +0000 (UTC) From: Hans de Goede To: Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6n?= =?utf-8?q?ig?= , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , =?utf-8?b?VmlsbGUgU3lyasOkbMOk?= , "Rafael J . Wysocki" , Len Brown Subject: [PATCH v10 13/17] pwm: crc: Implement get_state() method Date: Thu, 3 Sep 2020 13:23:33 +0200 Message-Id: <20200903112337.4113-14-hdegoede@redhat.com> In-Reply-To: <20200903112337.4113-1-hdegoede@redhat.com> References: <20200903112337.4113-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-pwm@vger.kernel.org, linux-acpi@vger.kernel.org, intel-gfx , dri-devel@lists.freedesktop.org, Hans de Goede , Andy Shevchenko , Mika Westerberg Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Implement the pwm_ops.get_state() method to complete the support for the new atomic PWM API. Reviewed-by: Andy Shevchenko Acked-by: Thierry Reding Signed-off-by: Hans de Goede --- Changes in v6: - Rebase on 5.9-rc1 - Use DIV_ROUND_UP_ULL because pwm_state.period and .duty_cycle are now u64 Changes in v5: - Fix an indentation issue Changes in v4: - Use DIV_ROUND_UP when calculating the period and duty_cycle from the controller's register values Changes in v3: - Add Andy's Reviewed-by tag - Remove extra whitespace to align some code after assignments (requested by Uwe Kleine-König) --- drivers/pwm/pwm-crc.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c index 27dc30882424..ecfdfac0c2d9 100644 --- a/drivers/pwm/pwm-crc.c +++ b/drivers/pwm/pwm-crc.c @@ -121,8 +121,39 @@ static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return 0; } +static void crc_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm, + struct pwm_state *state) +{ + struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip); + struct device *dev = crc_pwm->chip.dev; + unsigned int clk_div, clk_div_reg, duty_cycle_reg; + int error; + + error = regmap_read(crc_pwm->regmap, PWM0_CLK_DIV, &clk_div_reg); + if (error) { + dev_err(dev, "Error reading PWM0_CLK_DIV %d\n", error); + return; + } + + error = regmap_read(crc_pwm->regmap, PWM0_DUTY_CYCLE, &duty_cycle_reg); + if (error) { + dev_err(dev, "Error reading PWM0_DUTY_CYCLE %d\n", error); + return; + } + + clk_div = (clk_div_reg & ~PWM_OUTPUT_ENABLE) + 1; + + state->period = + DIV_ROUND_UP(clk_div * NSEC_PER_USEC * 256, PWM_BASE_CLK_MHZ); + state->duty_cycle = + DIV_ROUND_UP_ULL(duty_cycle_reg * state->period, PWM_MAX_LEVEL); + state->polarity = PWM_POLARITY_NORMAL; + state->enabled = !!(clk_div_reg & PWM_OUTPUT_ENABLE); +} + static const struct pwm_ops crc_pwm_ops = { .apply = crc_pwm_apply, + .get_state = crc_pwm_get_state, }; static int crystalcove_pwm_probe(struct platform_device *pdev)