From patchwork Wed Jul 1 08:21:59 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Boris Brezillon X-Patchwork-Id: 489927 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 411F51402C0 for ; Wed, 1 Jul 2015 18:23:09 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751500AbbGAIXI (ORCPT ); Wed, 1 Jul 2015 04:23:08 -0400 Received: from down.free-electrons.com ([37.187.137.238]:34418 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1750768AbbGAIWe (ORCPT ); Wed, 1 Jul 2015 04:22:34 -0400 Received: by mail.free-electrons.com (Postfix, from userid 106) id 5E0761F46; Wed, 1 Jul 2015 10:22:35 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on mail.free-electrons.com X-Spam-Level: X-Spam-Status: No, score=-1.0 required=5.0 tests=ALL_TRUSTED,SHORTCIRCUIT, URIBL_BLOCKED shortcircuit=ham autolearn=disabled version=3.4.0 Received: from localhost.localdomain (col31-4-88-188-83-94.fbx.proxad.net [88.188.83.94]) by mail.free-electrons.com (Postfix) with ESMTPSA id 44DA12705; Wed, 1 Jul 2015 10:22:27 +0200 (CEST) From: Boris Brezillon To: Thierry Reding , linux-pwm@vger.kernel.org Cc: Mark Brown , Liam Girdwood , Bryan Wu , Richard Purdie , Jacek Anaszewski , linux-leds@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Jean-Christophe Plagniol-Villard , Tomi Valkeinen , linux-fbdev@vger.kernel.org, Stephen Warren , Alexandre Courbot , linux-tegra@vger.kernel.org, Maxime Ripard , Jingoo Han , Lee Jones , Doug Anderson , Boris Brezillon Subject: [RFC PATCH 13/15] pwm: rockchip: add support for atomic update Date: Wed, 1 Jul 2015 10:21:59 +0200 Message-Id: <1435738921-25027-14-git-send-email-boris.brezillon@free-electrons.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> References: <1435738921-25027-1-git-send-email-boris.brezillon@free-electrons.com> Sender: linux-pwm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pwm@vger.kernel.org Implement the ->apply() function to add support for atomic update. Signed-off-by: Boris Brezillon --- drivers/pwm/pwm-rockchip.c | 75 ++++++++++++++++++++++++++++++---------------- 1 file changed, 49 insertions(+), 26 deletions(-) diff --git a/drivers/pwm/pwm-rockchip.c b/drivers/pwm/pwm-rockchip.c index 11e932d..cbe619bf 100644 --- a/drivers/pwm/pwm-rockchip.c +++ b/drivers/pwm/pwm-rockchip.c @@ -50,7 +50,8 @@ struct rockchip_pwm_data { const struct pwm_ops *ops; void (*set_enable)(struct pwm_chip *chip, - struct pwm_device *pwm, bool enable); + struct pwm_device *pwm, bool enable, + enum pwm_polarity polarity); void (*init)(struct pwm_chip *chip, struct pwm_device *pwm); }; @@ -60,7 +61,8 @@ static inline struct rockchip_pwm_chip *to_rockchip_pwm_chip(struct pwm_chip *c) } static void rockchip_pwm_set_enable_v1(struct pwm_chip *chip, - struct pwm_device *pwm, bool enable) + struct pwm_device *pwm, bool enable, + enum pwm_polarity polarity) { struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); u32 enable_conf = PWM_CTRL_OUTPUT_EN | PWM_CTRL_TIMER_EN; @@ -88,14 +90,15 @@ static void rockchip_pwm_init_v1(struct pwm_chip *chip, struct pwm_device *pwm) } static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, - struct pwm_device *pwm, bool enable) + struct pwm_device *pwm, bool enable, + enum pwm_polarity polarity) { struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | PWM_CONTINUOUS; u32 val; - if (pwm_get_polarity(pwm) == PWM_POLARITY_INVERSED) + if (polarity == PWM_POLARITY_INVERSED) enable_conf |= PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSITIVE; else enable_conf |= PWM_DUTY_POSITIVE | PWM_INACTIVE_NEGATIVE; @@ -110,6 +113,26 @@ static void rockchip_pwm_set_enable_v2(struct pwm_chip *chip, writel_relaxed(val, pc->base + pc->data->regs.ctrl); } +static void rockchip_pwm_init_v2(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); + u32 enable_conf = PWM_OUTPUT_LEFT | PWM_LP_DISABLE | PWM_ENABLE | + PWM_CONTINUOUS; + u32 val; + + val = readl(pc->base + pc->data->regs.ctrl); + + if ((val & enable_conf) != enable_conf) + return; + + pwm->state.enabled = true; + + enable_conf = PWM_DUTY_NEGATIVE | PWM_INACTIVE_POSITIVE; + + if ((val & enable_conf) == enable_conf) + pwm->state.polarity = PWM_POLARITY_INVERSED; +} + static void rockchip_pwm_init_state(struct pwm_chip *chip, struct pwm_device *pwm) { @@ -146,7 +169,6 @@ static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); unsigned long period, duty; u64 clk_rate, div; - int ret; clk_rate = clk_get_rate(pc->clk); @@ -163,15 +185,8 @@ static int rockchip_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, do_div(div, pc->data->prescaler * NSEC_PER_SEC); duty = div; - ret = clk_enable(pc->clk); - if (ret) - return ret; - writel(period, pc->base + pc->data->regs.period); writel(duty, pc->base + pc->data->regs.duty); - writel(0, pc->base + pc->data->regs.cntr); - - clk_disable(pc->clk); return 0; } @@ -189,43 +204,51 @@ static int rockchip_pwm_set_polarity(struct pwm_chip *chip, return 0; } -static int rockchip_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) +static int rockchip_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) { struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); + bool enabled = pwm_is_enabled(pwm); int ret; ret = clk_enable(pc->clk); if (ret) return ret; - pc->data->set_enable(chip, pwm, true); + if (state->polarity != pwm_get_polarity(pwm) && enabled) { + pc->data->set_enable(chip, pwm, false, state->polarity); + enabled = false; + } - return 0; -} + ret = rockchip_pwm_config(chip, pwm, state->duty_cycle, state->period); + if (ret) { + if (enabled != pwm_is_enabled(pwm)) + pc->data->set_enable(chip, pwm, !enabled, + state->polarity); -static void rockchip_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) -{ - struct rockchip_pwm_chip *pc = to_rockchip_pwm_chip(chip); + goto out; + } - pc->data->set_enable(chip, pwm, false); + if (state->enabled != enabled) + pc->data->set_enable(chip, pwm, state->enabled, + state->polarity); +out: clk_disable(pc->clk); + + return ret; } static const struct pwm_ops rockchip_pwm_ops_v1 = { .init_state = rockchip_pwm_init_state, - .config = rockchip_pwm_config, - .enable = rockchip_pwm_enable, - .disable = rockchip_pwm_disable, + .apply = rockchip_pwm_apply, .owner = THIS_MODULE, }; static const struct pwm_ops rockchip_pwm_ops_v2 = { .init_state = rockchip_pwm_init_state, - .config = rockchip_pwm_config, + .apply = rockchip_pwm_apply, .set_polarity = rockchip_pwm_set_polarity, - .enable = rockchip_pwm_enable, - .disable = rockchip_pwm_disable, .owner = THIS_MODULE, };