From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756839AbcJWWV4 (ORCPT ); Sun, 23 Oct 2016 18:21:56 -0400 Received: from 14.mo3.mail-out.ovh.net ([188.165.43.98]:36062 "EHLO 14.mo3.mail-out.ovh.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756769AbcJWWVy (ORCPT ); Sun, 23 Oct 2016 18:21:54 -0400 X-Greylist: delayed 2127 seconds by postgrey-1.27 at vger.kernel.org; Sun, 23 Oct 2016 18:21:53 EDT From: Lukasz Majewski To: Thierry Reding , Stefan Agner , Boris Brezillon Cc: linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Fabio Estevam , Fabio Estevam , Lothar Wassmann , Bhuvanchandra DV , kernel@pengutronix.de, Lukasz Majewski Subject: [PATCH 3/6] pwm: imx: Move PWMv2 wait for fifo slot code to a separate function Date: Sun, 23 Oct 2016 23:45:43 +0200 Message-Id: <1477259146-19167-4-git-send-email-l.majewski@majess.pl> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1477259146-19167-1-git-send-email-l.majewski@majess.pl> References: <1477259146-19167-1-git-send-email-l.majewski@majess.pl> X-Ovh-Tracer-Id: 3442720441194431109 X-VR-SPAMSTATE: OK X-VR-SPAMSCORE: -100 X-VR-SPAMCAUSE: gggruggvucftvghtrhhoucdtuddrfeelvddrieeggddtjecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfqggfjpdevjffgvefmvefgnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The code, which waits for fifo slot, has been extracted from imx_pwm_config_v2 function and moved to new one - imx_pwm_wait_fifo_slot(). This change reduces the overall size of imx_pwm_config_v2() and prepares it for atomic PWM operation. Suggested-by: Stefan Agner Suggested-by: Boris Brezillon Signed-off-by: Lukasz Majewski --- drivers/pwm/pwm-imx.c | 42 +++++++++++++++++++++++++----------------- 1 file changed, 25 insertions(+), 17 deletions(-) diff --git a/drivers/pwm/pwm-imx.c b/drivers/pwm/pwm-imx.c index fac5c93..f3577c5 100644 --- a/drivers/pwm/pwm-imx.c +++ b/drivers/pwm/pwm-imx.c @@ -149,18 +149,36 @@ static void imx_pwm_sw_reset(struct pwm_chip *chip) dev_warn(dev, "software reset timeout\n"); } +static void imx_pwm_wait_fifo_slot(struct pwm_chip *chip, + struct pwm_device *pwm) +{ + struct imx_chip *imx = to_imx_chip(chip); + struct device *dev = chip->dev; + unsigned int period_ms; + int fifoav; + u32 sr; + + sr = readl(imx->mmio_base + MX3_PWMSR); + fifoav = sr & MX3_PWMSR_FIFOAV_MASK; + if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) { + period_ms = DIV_ROUND_UP(pwm_get_period(pwm), + NSEC_PER_MSEC); + msleep(period_ms); + + sr = readl(imx->mmio_base + MX3_PWMSR); + if (fifoav == (sr & MX3_PWMSR_FIFOAV_MASK)) + dev_warn(dev, "there is no free FIFO slot\n"); + } +} static int imx_pwm_config_v2(struct pwm_chip *chip, struct pwm_device *pwm, int duty_ns, int period_ns) { struct imx_chip *imx = to_imx_chip(chip); - struct device *dev = chip->dev; unsigned long long c; unsigned long period_cycles, duty_cycles, prescale; - unsigned int period_ms; bool enable = pwm_is_enabled(pwm); - int fifoav; - u32 cr, sr; + u32 cr; /* * i.MX PWMv2 has a 4-word sample FIFO. @@ -169,19 +187,9 @@ static int imx_pwm_config_v2(struct pwm_chip *chip, * wait for a full PWM cycle to get a relinquished FIFO slot * when the controller is enabled and the FIFO is fully loaded. */ - if (enable) { - sr = readl(imx->mmio_base + MX3_PWMSR); - fifoav = sr & MX3_PWMSR_FIFOAV_MASK; - if (fifoav == MX3_PWMSR_FIFOAV_4WORDS) { - period_ms = DIV_ROUND_UP(pwm_get_period(pwm), - NSEC_PER_MSEC); - msleep(period_ms); - - sr = readl(imx->mmio_base + MX3_PWMSR); - if (fifoav == (sr & MX3_PWMSR_FIFOAV_MASK)) - dev_warn(dev, "there is no free FIFO slot\n"); - } - } else + if (enable) + imx_pwm_wait_fifo_slot(chip, pwm); + else imx_pwm_sw_reset(chip); c = clk_get_rate(imx->clk_per); -- 2.1.4