From patchwork Mon Dec 18 09:06:42 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496424 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 53A7211198; Mon, 18 Dec 2023 09:07:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="E663Cw2U"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="eaXb5fy+" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890436; bh=H02m+7ZCWR76SzdKN2YGwZ97zwCUhVUPpmdrKW2ye6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E663Cw2UA+9QpcPEJ7hdBbIoKTIWcBDNngS8X5RapUaPqSccQk+JkBDZlFqVOExKS DXjqDV8K4ZgETkeMTN1dksxJ9kuvOPOsgVxPcNZJpt5tcSZsGYeAZ64acxXoN9yCsT 4NsUw7N4WmvwMABm0kxA5cOnQv8iLXrYYSkohEJXaWMv0zPBG6OZzKCGt09n7fQWq3 lRc/Q7LAFUpXNfw1c0gVlrBlpPtSLEp+LpZWMKj7DacnvJZaX4HMebImIBitPsOtpf pcvE6vv7Ph4oQzOkMZAngE8rzVybd/Q1UGkPm9aTmPUEJRpoteARdURn+PvRmPZ2k2 UQ12yPjEalm9w== Received: by gofer.mess.org (Postfix, from userid 501) id 8280E1009FC; Mon, 18 Dec 2023 09:07:16 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890419; bh=H02m+7ZCWR76SzdKN2YGwZ97zwCUhVUPpmdrKW2ye6M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eaXb5fy+GxpmWSQoLjUvCulqSj+p90C0xqUDxECbTgZd1SM6aG70JbAmgiy387ZiB EkfeXQxrlR5SvCSCx/mc1yn6DWR2uHBVMFeemLsMbHh28YM8JPTnSxjaQOVMyYegBw ic79gDMR+GGC89/sqZaiD+LbNQ4dvRC6O6pV4ckfuv7co1e392pu9QOeJuC0ZhLwlE 3p91iTR9NVcnSsxltkW1TxlgLq0CbTEFTwDa2BsQaTQj4d7gpUXc4UBrmeWl/ONOpT yTsb20uTDSnzAigTfa7KhGv9BY4cJQlssFB9BgeOAEIlgvfMbJLiM4D0Bhe+IZxYpH 5QPL9jX3k9X4w== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id CBFBC10029E; Mon, 18 Dec 2023 09:06:59 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Jonathan Corbet , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , David Airlie , Daniel Vetter , Javier Martinez Canillas , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , Jean Delvare , Guenter Roeck , Support Opensource , Dmitry Torokhov , Pavel Machek , Lee Jones , Sean Young , Mauro Carvalho Chehab , Hans de Goede , =?utf-8?q?Ilpo_J=C3=A4rvinen?= , Mark Gross , Liam Girdwood , Mark Brown , Daniel Thompson , Jingoo Han , Helge Deller Cc: Jani Nikula , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-leds@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-fbdev@vger.kernel.org Subject: [PATCH v9 1/6] pwm: Rename pwm_apply_state() to pwm_apply_might_sleep() Date: Mon, 18 Dec 2023 09:06:42 +0000 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In order to introduce a pwm api which can be used from atomic context, we will need two functions for applying pwm changes: int pwm_apply_might_sleep(struct pwm *, struct pwm_state *); int pwm_apply_atomic(struct pwm *, struct pwm_state *); This commit just deals with renaming pwm_apply_state(), a following commit will introduce the pwm_apply_atomic() function. Acked-by: Uwe Kleine-König Acked-by: Guenter Roeck Acked-by: Mark Brown Acked-by: Dmitry Torokhov # for input Acked-by: Hans de Goede Acked-by: Jani Nikula Acked-by: Lee Jones Signed-off-by: Sean Young --- Documentation/driver-api/pwm.rst | 8 +++--- MAINTAINERS | 2 +- .../gpu/drm/i915/display/intel_backlight.c | 6 ++-- drivers/gpu/drm/solomon/ssd130x.c | 2 +- drivers/hwmon/pwm-fan.c | 8 +++--- drivers/input/misc/da7280.c | 4 +-- drivers/input/misc/pwm-beeper.c | 4 +-- drivers/input/misc/pwm-vibra.c | 8 +++--- drivers/leds/leds-pwm.c | 2 +- drivers/leds/rgb/leds-pwm-multicolor.c | 4 +-- drivers/media/rc/pwm-ir-tx.c | 4 +-- drivers/platform/x86/lenovo-yogabook.c | 2 +- drivers/pwm/core.c | 18 ++++++------ drivers/pwm/pwm-twl-led.c | 2 +- drivers/pwm/pwm-vt8500.c | 2 +- drivers/pwm/sysfs.c | 10 +++---- drivers/regulator/pwm-regulator.c | 4 +-- drivers/video/backlight/lm3630a_bl.c | 2 +- drivers/video/backlight/lp855x_bl.c | 2 +- drivers/video/backlight/pwm_bl.c | 12 ++++---- drivers/video/fbdev/ssd1307fb.c | 2 +- include/linux/pwm.h | 28 +++++++++---------- 22 files changed, 68 insertions(+), 68 deletions(-) diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst index bb264490a87a..f1d8197c8c43 100644 --- a/Documentation/driver-api/pwm.rst +++ b/Documentation/driver-api/pwm.rst @@ -41,7 +41,7 @@ the getter, devm_pwm_get() and devm_fwnode_pwm_get(), also exist. After being requested, a PWM has to be configured using:: - int pwm_apply_state(struct pwm_device *pwm, struct pwm_state *state); + int pwm_apply_might_sleep(struct pwm_device *pwm, struct pwm_state *state); This API controls both the PWM period/duty_cycle config and the enable/disable state. @@ -57,13 +57,13 @@ If supported by the driver, the signal can be optimized, for example to improve EMI by phase shifting the individual channels of a chip. The pwm_config(), pwm_enable() and pwm_disable() functions are just wrappers -around pwm_apply_state() and should not be used if the user wants to change +around pwm_apply_might_sleep() and should not be used if the user wants to change several parameter at once. For example, if you see pwm_config() and pwm_{enable,disable}() calls in the same function, this probably means you -should switch to pwm_apply_state(). +should switch to pwm_apply_might_sleep(). The PWM user API also allows one to query the PWM state that was passed to the -last invocation of pwm_apply_state() using pwm_get_state(). Note this is +last invocation of pwm_apply_might_sleep() using pwm_get_state(). Note this is different to what the driver has actually implemented if the request cannot be satisfied exactly with the hardware in use. There is currently no way for consumers to get the actually implemented settings. diff --git a/MAINTAINERS b/MAINTAINERS index 97f51d5ec1cf..c58480595220 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17576,7 +17576,7 @@ F: drivers/video/backlight/pwm_bl.c F: include/dt-bindings/pwm/ F: include/linux/pwm.h F: include/linux/pwm_backlight.h -K: pwm_(config|apply_state|ops) +K: pwm_(config|apply_might_sleep|ops) PXA GPIO DRIVER M: Robert Jarzmik diff --git a/drivers/gpu/drm/i915/display/intel_backlight.c b/drivers/gpu/drm/i915/display/intel_backlight.c index 2e8f17c04522..ff9b9918b0a1 100644 --- a/drivers/gpu/drm/i915/display/intel_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_backlight.c @@ -274,7 +274,7 @@ static void ext_pwm_set_backlight(const struct drm_connector_state *conn_state, struct intel_panel *panel = &to_intel_connector(conn_state->connector)->panel; pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100); - pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); + pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state); } static void @@ -427,7 +427,7 @@ static void ext_pwm_disable_backlight(const struct drm_connector_state *old_conn intel_backlight_set_pwm_level(old_conn_state, level); panel->backlight.pwm_state.enabled = false; - pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); + pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state); } void intel_backlight_disable(const struct drm_connector_state *old_conn_state) @@ -749,7 +749,7 @@ static void ext_pwm_enable_backlight(const struct intel_crtc_state *crtc_state, pwm_set_relative_duty_cycle(&panel->backlight.pwm_state, level, 100); panel->backlight.pwm_state.enabled = true; - pwm_apply_state(panel->backlight.pwm, &panel->backlight.pwm_state); + pwm_apply_might_sleep(panel->backlight.pwm, &panel->backlight.pwm_state); } static void __intel_backlight_enable(const struct intel_crtc_state *crtc_state, diff --git a/drivers/gpu/drm/solomon/ssd130x.c b/drivers/gpu/drm/solomon/ssd130x.c index e0174f82e353..cce043a4a1dc 100644 --- a/drivers/gpu/drm/solomon/ssd130x.c +++ b/drivers/gpu/drm/solomon/ssd130x.c @@ -319,7 +319,7 @@ static int ssd130x_pwm_enable(struct ssd130x_device *ssd130x) pwm_init_state(ssd130x->pwm, &pwmstate); pwm_set_relative_duty_cycle(&pwmstate, 50, 100); - pwm_apply_state(ssd130x->pwm, &pwmstate); + pwm_apply_might_sleep(ssd130x->pwm, &pwmstate); /* Enable the PWM */ pwm_enable(ssd130x->pwm); diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c index 6e4516c2ab89..b67bc9e833c0 100644 --- a/drivers/hwmon/pwm-fan.c +++ b/drivers/hwmon/pwm-fan.c @@ -151,7 +151,7 @@ static int pwm_fan_power_on(struct pwm_fan_ctx *ctx) } state->enabled = true; - ret = pwm_apply_state(ctx->pwm, state); + ret = pwm_apply_might_sleep(ctx->pwm, state); if (ret) { dev_err(ctx->dev, "failed to enable PWM\n"); goto disable_regulator; @@ -181,7 +181,7 @@ static int pwm_fan_power_off(struct pwm_fan_ctx *ctx) state->enabled = false; state->duty_cycle = 0; - ret = pwm_apply_state(ctx->pwm, state); + ret = pwm_apply_might_sleep(ctx->pwm, state); if (ret) { dev_err(ctx->dev, "failed to disable PWM\n"); return ret; @@ -207,7 +207,7 @@ static int __set_pwm(struct pwm_fan_ctx *ctx, unsigned long pwm) period = state->period; state->duty_cycle = DIV_ROUND_UP(pwm * (period - 1), MAX_PWM); - ret = pwm_apply_state(ctx->pwm, state); + ret = pwm_apply_might_sleep(ctx->pwm, state); if (ret) return ret; ret = pwm_fan_power_on(ctx); @@ -278,7 +278,7 @@ static int pwm_fan_update_enable(struct pwm_fan_ctx *ctx, long val) state, &enable_regulator); - pwm_apply_state(ctx->pwm, state); + pwm_apply_might_sleep(ctx->pwm, state); pwm_fan_switch_power(ctx, enable_regulator); pwm_fan_update_state(ctx, 0); } diff --git a/drivers/input/misc/da7280.c b/drivers/input/misc/da7280.c index ce82548916bb..c1fa75c0f970 100644 --- a/drivers/input/misc/da7280.c +++ b/drivers/input/misc/da7280.c @@ -352,7 +352,7 @@ static int da7280_haptic_set_pwm(struct da7280_haptic *haptics, bool enabled) state.duty_cycle = period_mag_multi; } - error = pwm_apply_state(haptics->pwm_dev, &state); + error = pwm_apply_might_sleep(haptics->pwm_dev, &state); if (error) dev_err(haptics->dev, "Failed to apply pwm state: %d\n", error); @@ -1175,7 +1175,7 @@ static int da7280_probe(struct i2c_client *client) /* Sync up PWM state and ensure it is off. */ pwm_init_state(haptics->pwm_dev, &state); state.enabled = false; - error = pwm_apply_state(haptics->pwm_dev, &state); + error = pwm_apply_might_sleep(haptics->pwm_dev, &state); if (error) { dev_err(dev, "Failed to apply PWM state: %d\n", error); return error; diff --git a/drivers/input/misc/pwm-beeper.c b/drivers/input/misc/pwm-beeper.c index 1e731d8397c6..5b9aedf4362f 100644 --- a/drivers/input/misc/pwm-beeper.c +++ b/drivers/input/misc/pwm-beeper.c @@ -39,7 +39,7 @@ static int pwm_beeper_on(struct pwm_beeper *beeper, unsigned long period) state.period = period; pwm_set_relative_duty_cycle(&state, 50, 100); - error = pwm_apply_state(beeper->pwm, &state); + error = pwm_apply_might_sleep(beeper->pwm, &state); if (error) return error; @@ -138,7 +138,7 @@ static int pwm_beeper_probe(struct platform_device *pdev) /* Sync up PWM state and ensure it is off. */ pwm_init_state(beeper->pwm, &state); state.enabled = false; - error = pwm_apply_state(beeper->pwm, &state); + error = pwm_apply_might_sleep(beeper->pwm, &state); if (error) { dev_err(dev, "failed to apply initial PWM state: %d\n", error); diff --git a/drivers/input/misc/pwm-vibra.c b/drivers/input/misc/pwm-vibra.c index acac79c488aa..3e5ed685ed8f 100644 --- a/drivers/input/misc/pwm-vibra.c +++ b/drivers/input/misc/pwm-vibra.c @@ -56,7 +56,7 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator) pwm_set_relative_duty_cycle(&state, vibrator->level, 0xffff); state.enabled = true; - err = pwm_apply_state(vibrator->pwm, &state); + err = pwm_apply_might_sleep(vibrator->pwm, &state); if (err) { dev_err(pdev, "failed to apply pwm state: %d\n", err); return err; @@ -67,7 +67,7 @@ static int pwm_vibrator_start(struct pwm_vibrator *vibrator) state.duty_cycle = vibrator->direction_duty_cycle; state.enabled = true; - err = pwm_apply_state(vibrator->pwm_dir, &state); + err = pwm_apply_might_sleep(vibrator->pwm_dir, &state); if (err) { dev_err(pdev, "failed to apply dir-pwm state: %d\n", err); pwm_disable(vibrator->pwm); @@ -160,7 +160,7 @@ static int pwm_vibrator_probe(struct platform_device *pdev) /* Sync up PWM state and ensure it is off. */ pwm_init_state(vibrator->pwm, &state); state.enabled = false; - err = pwm_apply_state(vibrator->pwm, &state); + err = pwm_apply_might_sleep(vibrator->pwm, &state); if (err) { dev_err(&pdev->dev, "failed to apply initial PWM state: %d\n", err); @@ -174,7 +174,7 @@ static int pwm_vibrator_probe(struct platform_device *pdev) /* Sync up PWM state and ensure it is off. */ pwm_init_state(vibrator->pwm_dir, &state); state.enabled = false; - err = pwm_apply_state(vibrator->pwm_dir, &state); + err = pwm_apply_might_sleep(vibrator->pwm_dir, &state); if (err) { dev_err(&pdev->dev, "failed to apply initial PWM state: %d\n", err); diff --git a/drivers/leds/leds-pwm.c b/drivers/leds/leds-pwm.c index 2b3bf1353b70..4e3936a39d0e 100644 --- a/drivers/leds/leds-pwm.c +++ b/drivers/leds/leds-pwm.c @@ -54,7 +54,7 @@ static int led_pwm_set(struct led_classdev *led_cdev, led_dat->pwmstate.duty_cycle = duty; led_dat->pwmstate.enabled = true; - return pwm_apply_state(led_dat->pwm, &led_dat->pwmstate); + return pwm_apply_might_sleep(led_dat->pwm, &led_dat->pwmstate); } __attribute__((nonnull)) diff --git a/drivers/leds/rgb/leds-pwm-multicolor.c b/drivers/leds/rgb/leds-pwm-multicolor.c index 46cd062b8b24..e1a81e0109e8 100644 --- a/drivers/leds/rgb/leds-pwm-multicolor.c +++ b/drivers/leds/rgb/leds-pwm-multicolor.c @@ -51,8 +51,8 @@ static int led_pwm_mc_set(struct led_classdev *cdev, priv->leds[i].state.duty_cycle = duty; priv->leds[i].state.enabled = duty > 0; - ret = pwm_apply_state(priv->leds[i].pwm, - &priv->leds[i].state); + ret = pwm_apply_might_sleep(priv->leds[i].pwm, + &priv->leds[i].state); if (ret) break; } diff --git a/drivers/media/rc/pwm-ir-tx.c b/drivers/media/rc/pwm-ir-tx.c index c5f37c03af9c..cf51e2760975 100644 --- a/drivers/media/rc/pwm-ir-tx.c +++ b/drivers/media/rc/pwm-ir-tx.c @@ -68,7 +68,7 @@ static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf, for (i = 0; i < count; i++) { state.enabled = !(i % 2); - pwm_apply_state(pwm, &state); + pwm_apply_might_sleep(pwm, &state); edge = ktime_add_us(edge, txbuf[i]); delta = ktime_us_delta(edge, ktime_get()); @@ -77,7 +77,7 @@ static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf, } state.enabled = false; - pwm_apply_state(pwm, &state); + pwm_apply_might_sleep(pwm, &state); return count; } diff --git a/drivers/platform/x86/lenovo-yogabook.c b/drivers/platform/x86/lenovo-yogabook.c index b8d0239192cb..fd62bf746ebd 100644 --- a/drivers/platform/x86/lenovo-yogabook.c +++ b/drivers/platform/x86/lenovo-yogabook.c @@ -435,7 +435,7 @@ static int yogabook_pdev_set_kbd_backlight(struct yogabook_data *data, u8 level) .enabled = level, }; - pwm_apply_state(data->kbd_bl_pwm, &state); + pwm_apply_might_sleep(data->kbd_bl_pwm, &state); gpiod_set_value(data->kbd_bl_led_enable, level ? 1 : 0); return 0; } diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index f60b715abe62..c2d78136625d 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -326,8 +326,8 @@ struct pwm_device *pwm_request_from_chip(struct pwm_chip *chip, } EXPORT_SYMBOL_GPL(pwm_request_from_chip); -static void pwm_apply_state_debug(struct pwm_device *pwm, - const struct pwm_state *state) +static void pwm_apply_debug(struct pwm_device *pwm, + const struct pwm_state *state) { struct pwm_state *last = &pwm->last; struct pwm_chip *chip = pwm->chip; @@ -433,11 +433,11 @@ static void pwm_apply_state_debug(struct pwm_device *pwm, } /** - * pwm_apply_state() - atomically apply a new state to a PWM device + * pwm_apply_might_sleep() - atomically apply a new state to a PWM device * @pwm: PWM device * @state: new state to apply */ -int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) +int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) { struct pwm_chip *chip; int err; @@ -445,7 +445,7 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) /* * Some lowlevel driver's implementations of .apply() make use of * mutexes, also with some drivers only returning when the new - * configuration is active calling pwm_apply_state() from atomic context + * configuration is active calling pwm_apply_might_sleep() from atomic context * is a bad idea. So make it explicit that calling this function might * sleep. */ @@ -475,11 +475,11 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state) * only do this after pwm->state was applied as some * implementations of .get_state depend on this */ - pwm_apply_state_debug(pwm, state); + pwm_apply_debug(pwm, state); return 0; } -EXPORT_SYMBOL_GPL(pwm_apply_state); +EXPORT_SYMBOL_GPL(pwm_apply_might_sleep); /** * pwm_capture() - capture and report a PWM signal @@ -537,7 +537,7 @@ int pwm_adjust_config(struct pwm_device *pwm) state.period = pargs.period; state.polarity = pargs.polarity; - return pwm_apply_state(pwm, &state); + return pwm_apply_might_sleep(pwm, &state); } /* @@ -560,7 +560,7 @@ int pwm_adjust_config(struct pwm_device *pwm) state.duty_cycle = state.period - state.duty_cycle; } - return pwm_apply_state(pwm, &state); + return pwm_apply_might_sleep(pwm, &state); } EXPORT_SYMBOL_GPL(pwm_adjust_config); diff --git a/drivers/pwm/pwm-twl-led.c b/drivers/pwm/pwm-twl-led.c index 8a870d0db3c6..c670ccb81653 100644 --- a/drivers/pwm/pwm-twl-led.c +++ b/drivers/pwm/pwm-twl-led.c @@ -172,7 +172,7 @@ static int twl4030_pwmled_apply(struct pwm_chip *chip, struct pwm_device *pwm, * We cannot skip calling ->config even if state->period == * pwm->state.period && state->duty_cycle == pwm->state.duty_cycle * because we might have exited early in the last call to - * pwm_apply_state because of !state->enabled and so the two values in + * pwm_apply_might_sleep because of !state->enabled and so the two values in * pwm->state might not be configured in hardware. */ ret = twl4030_pwmled_config(chip, pwm, diff --git a/drivers/pwm/pwm-vt8500.c b/drivers/pwm/pwm-vt8500.c index bdea60389487..7bfeacee05d0 100644 --- a/drivers/pwm/pwm-vt8500.c +++ b/drivers/pwm/pwm-vt8500.c @@ -206,7 +206,7 @@ static int vt8500_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, * We cannot skip calling ->config even if state->period == * pwm->state.period && state->duty_cycle == pwm->state.duty_cycle * because we might have exited early in the last call to - * pwm_apply_state because of !state->enabled and so the two values in + * pwm_apply_might_sleep because of !state->enabled and so the two values in * pwm->state might not be configured in hardware. */ err = vt8500_pwm_config(chip, pwm, state->duty_cycle, state->period); diff --git a/drivers/pwm/sysfs.c b/drivers/pwm/sysfs.c index 4edb994fa2e1..1698609d91c8 100644 --- a/drivers/pwm/sysfs.c +++ b/drivers/pwm/sysfs.c @@ -62,7 +62,7 @@ static ssize_t period_store(struct device *child, mutex_lock(&export->lock); pwm_get_state(pwm, &state); state.period = val; - ret = pwm_apply_state(pwm, &state); + ret = pwm_apply_might_sleep(pwm, &state); mutex_unlock(&export->lock); return ret ? : size; @@ -97,7 +97,7 @@ static ssize_t duty_cycle_store(struct device *child, mutex_lock(&export->lock); pwm_get_state(pwm, &state); state.duty_cycle = val; - ret = pwm_apply_state(pwm, &state); + ret = pwm_apply_might_sleep(pwm, &state); mutex_unlock(&export->lock); return ret ? : size; @@ -144,7 +144,7 @@ static ssize_t enable_store(struct device *child, goto unlock; } - ret = pwm_apply_state(pwm, &state); + ret = pwm_apply_might_sleep(pwm, &state); unlock: mutex_unlock(&export->lock); @@ -194,7 +194,7 @@ static ssize_t polarity_store(struct device *child, mutex_lock(&export->lock); pwm_get_state(pwm, &state); state.polarity = polarity; - ret = pwm_apply_state(pwm, &state); + ret = pwm_apply_might_sleep(pwm, &state); mutex_unlock(&export->lock); return ret ? : size; @@ -401,7 +401,7 @@ static int pwm_class_apply_state(struct pwm_export *export, struct pwm_device *pwm, struct pwm_state *state) { - int ret = pwm_apply_state(pwm, state); + int ret = pwm_apply_might_sleep(pwm, state); /* release lock taken in pwm_class_get_state */ mutex_unlock(&export->lock); diff --git a/drivers/regulator/pwm-regulator.c b/drivers/regulator/pwm-regulator.c index 2aff6db748e2..698c420e0869 100644 --- a/drivers/regulator/pwm-regulator.c +++ b/drivers/regulator/pwm-regulator.c @@ -90,7 +90,7 @@ static int pwm_regulator_set_voltage_sel(struct regulator_dev *rdev, pwm_set_relative_duty_cycle(&pstate, drvdata->duty_cycle_table[selector].dutycycle, 100); - ret = pwm_apply_state(drvdata->pwm, &pstate); + ret = pwm_apply_might_sleep(drvdata->pwm, &pstate); if (ret) { dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret); return ret; @@ -216,7 +216,7 @@ static int pwm_regulator_set_voltage(struct regulator_dev *rdev, pwm_set_relative_duty_cycle(&pstate, dutycycle, duty_unit); - ret = pwm_apply_state(drvdata->pwm, &pstate); + ret = pwm_apply_might_sleep(drvdata->pwm, &pstate); if (ret) { dev_err(&rdev->dev, "Failed to configure PWM: %d\n", ret); return ret; diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c index 8fcb62be597b..a3412c936ca2 100644 --- a/drivers/video/backlight/lm3630a_bl.c +++ b/drivers/video/backlight/lm3630a_bl.c @@ -180,7 +180,7 @@ static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max) pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false; - return pwm_apply_state(pchip->pwmd, &pchip->pwmd_state); + return pwm_apply_might_sleep(pchip->pwmd, &pchip->pwmd_state); } /* update and get brightness */ diff --git a/drivers/video/backlight/lp855x_bl.c b/drivers/video/backlight/lp855x_bl.c index da1f124db69c..7075bfab59c4 100644 --- a/drivers/video/backlight/lp855x_bl.c +++ b/drivers/video/backlight/lp855x_bl.c @@ -234,7 +234,7 @@ static int lp855x_pwm_ctrl(struct lp855x *lp, int br, int max_br) state.duty_cycle = div_u64(br * state.period, max_br); state.enabled = state.duty_cycle; - return pwm_apply_state(lp->pwm, &state); + return pwm_apply_might_sleep(lp->pwm, &state); } static int lp855x_bl_update_status(struct backlight_device *bl) diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c index 289bd9ce4d36..35c716e9043c 100644 --- a/drivers/video/backlight/pwm_bl.c +++ b/drivers/video/backlight/pwm_bl.c @@ -103,7 +103,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl) pwm_get_state(pb->pwm, &state); state.duty_cycle = compute_duty_cycle(pb, brightness, &state); state.enabled = true; - pwm_apply_state(pb->pwm, &state); + pwm_apply_might_sleep(pb->pwm, &state); pwm_backlight_power_on(pb); } else { @@ -120,7 +120,7 @@ static int pwm_backlight_update_status(struct backlight_device *bl) * inactive output. */ state.enabled = !pb->power_supply && !pb->enable_gpio; - pwm_apply_state(pb->pwm, &state); + pwm_apply_might_sleep(pb->pwm, &state); } if (pb->notify_after) @@ -528,7 +528,7 @@ static int pwm_backlight_probe(struct platform_device *pdev) if (!state.period && (data->pwm_period_ns > 0)) state.period = data->pwm_period_ns; - ret = pwm_apply_state(pb->pwm, &state); + ret = pwm_apply_might_sleep(pb->pwm, &state); if (ret) { dev_err(&pdev->dev, "failed to apply initial PWM state: %d\n", ret); @@ -633,7 +633,7 @@ static void pwm_backlight_remove(struct platform_device *pdev) pwm_get_state(pb->pwm, &state); state.duty_cycle = 0; state.enabled = false; - pwm_apply_state(pb->pwm, &state); + pwm_apply_might_sleep(pb->pwm, &state); if (pb->exit) pb->exit(&pdev->dev); @@ -649,7 +649,7 @@ static void pwm_backlight_shutdown(struct platform_device *pdev) pwm_get_state(pb->pwm, &state); state.duty_cycle = 0; state.enabled = false; - pwm_apply_state(pb->pwm, &state); + pwm_apply_might_sleep(pb->pwm, &state); } #ifdef CONFIG_PM_SLEEP @@ -673,7 +673,7 @@ static int pwm_backlight_suspend(struct device *dev) pwm_get_state(pb->pwm, &state); state.duty_cycle = 0; state.enabled = false; - pwm_apply_state(pb->pwm, &state); + pwm_apply_might_sleep(pb->pwm, &state); if (pb->notify_after) pb->notify_after(pb->dev, 0); diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c index 5ae48e36fccb..1a4f90ea7d5a 100644 --- a/drivers/video/fbdev/ssd1307fb.c +++ b/drivers/video/fbdev/ssd1307fb.c @@ -347,7 +347,7 @@ static int ssd1307fb_init(struct ssd1307fb_par *par) pwm_init_state(par->pwm, &pwmstate); pwm_set_relative_duty_cycle(&pwmstate, 50, 100); - pwm_apply_state(par->pwm, &pwmstate); + pwm_apply_might_sleep(par->pwm, &pwmstate); /* Enable the PWM */ pwm_enable(par->pwm); diff --git a/include/linux/pwm.h b/include/linux/pwm.h index f87655c06c82..b64b8a82415c 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -92,8 +92,8 @@ struct pwm_device { * @state: state to fill with the current PWM state * * The returned PWM state represents the state that was applied by a previous call to - * pwm_apply_state(). Drivers may have to slightly tweak that state before programming it to - * hardware. If pwm_apply_state() was never called, this returns either the current hardware + * pwm_apply_might_sleep(). Drivers may have to slightly tweak that state before programming it to + * hardware. If pwm_apply_might_sleep() was never called, this returns either the current hardware * state (if supported) or the default settings. */ static inline void pwm_get_state(const struct pwm_device *pwm, @@ -157,20 +157,20 @@ static inline void pwm_get_args(const struct pwm_device *pwm, } /** - * pwm_init_state() - prepare a new state to be applied with pwm_apply_state() + * pwm_init_state() - prepare a new state to be applied with pwm_apply_might_sleep() * @pwm: PWM device * @state: state to fill with the prepared PWM state * * This functions prepares a state that can later be tweaked and applied - * to the PWM device with pwm_apply_state(). This is a convenient function + * to the PWM device with pwm_apply_might_sleep(). This is a convenient function * that first retrieves the current PWM state and the replaces the period * and polarity fields with the reference values defined in pwm->args. * Once the function returns, you can adjust the ->enabled and ->duty_cycle - * fields according to your needs before calling pwm_apply_state(). + * fields according to your needs before calling pwm_apply_might_sleep(). * * ->duty_cycle is initially set to zero to avoid cases where the current * ->duty_cycle value exceed the pwm_args->period one, which would trigger - * an error if the user calls pwm_apply_state() without adjusting ->duty_cycle + * an error if the user calls pwm_apply_might_sleep() without adjusting ->duty_cycle * first. */ static inline void pwm_init_state(const struct pwm_device *pwm, @@ -226,7 +226,7 @@ pwm_get_relative_duty_cycle(const struct pwm_state *state, unsigned int scale) * * pwm_init_state(pwm, &state); * pwm_set_relative_duty_cycle(&state, 50, 100); - * pwm_apply_state(pwm, &state); + * pwm_apply_might_sleep(pwm, &state); * * This functions returns -EINVAL if @duty_cycle and/or @scale are * inconsistent (@scale == 0 or @duty_cycle > @scale). @@ -304,7 +304,7 @@ struct pwm_chip { #if IS_ENABLED(CONFIG_PWM) /* PWM user APIs */ -int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state); +int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state); int pwm_adjust_config(struct pwm_device *pwm); /** @@ -332,7 +332,7 @@ static inline int pwm_config(struct pwm_device *pwm, int duty_ns, state.duty_cycle = duty_ns; state.period = period_ns; - return pwm_apply_state(pwm, &state); + return pwm_apply_might_sleep(pwm, &state); } /** @@ -353,7 +353,7 @@ static inline int pwm_enable(struct pwm_device *pwm) return 0; state.enabled = true; - return pwm_apply_state(pwm, &state); + return pwm_apply_might_sleep(pwm, &state); } /** @@ -372,7 +372,7 @@ static inline void pwm_disable(struct pwm_device *pwm) return; state.enabled = false; - pwm_apply_state(pwm, &state); + pwm_apply_might_sleep(pwm, &state); } /* PWM provider APIs */ @@ -403,8 +403,8 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode, const char *con_id); #else -static inline int pwm_apply_state(struct pwm_device *pwm, - const struct pwm_state *state) +static inline int pwm_apply_might_sleep(struct pwm_device *pwm, + const struct pwm_state *state) { might_sleep(); return -ENOTSUPP; @@ -521,7 +521,7 @@ static inline void pwm_apply_args(struct pwm_device *pwm) state.period = pwm->args.period; state.usage_power = false; - pwm_apply_state(pwm, &state); + pwm_apply_might_sleep(pwm, &state); } struct pwm_lookup { From patchwork Mon Dec 18 09:06:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496422 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C528125A5; Mon, 18 Dec 2023 09:07:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="XD9yKPIX"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="ps7D0E6K" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890434; bh=M9WlBbQS+py4vER3IqEGVhXVemW9VnxieqHLqtwQ3LU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XD9yKPIXqiiGz+JMhJtxPdySF+OoOU2IBt2PN5pf2fRf4IVuHalPF95qrJaWDW8M2 UYc2YjJus9OAzfSbyTKBYlF/rieSc+yqZQEeCfjkl6dk18Fb4US2Owv9QN7xcTjFVM XcpyPJ8j7Gqqzuug6p0//NLOQO2ZbUfsAcQhSqOiWsGXf/GGJyKa3LLqXanz+PKlM7 lmRodLFXcQqwG8+xEIgVv6wCm4XVzboo+Ko+weFxmYHP85G5cPYc8wOyVwBgfoppcS NgOV+0mhHJok76UPHUpav2R2RLmjGjnLmczUWwNNMejmR3YesOUevTNwyl6RvcsFs3 brsVrvI1O/j4g== Received: by gofer.mess.org (Postfix, from userid 501) id E0ACD100A06; Mon, 18 Dec 2023 09:07:14 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890420; bh=M9WlBbQS+py4vER3IqEGVhXVemW9VnxieqHLqtwQ3LU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ps7D0E6KbDPw/1N6ea7ATvd4BzRKSOD2B83ULZcceR0d35PhXuGTCPPzNbjYziZDN Hn0fBfjt4uOpDH5qeTYiDy2y7Tmn/XVFtu+S9VyxZLYvxUpKxldNMPVbYviHfZMffM Enp08OhvEHAeccqI/GMV9PSCPNbgUG8OKjCKFfnUYSINtHn150GNgV4+tz0u6xmnQN JpMprVKDiHtkH7CDT5EzepDY8x8hvKMPYHXrEwt//vre+/z/eyJfkMV/0tBM57JEpX uiYFjfEf6wo0pdMled1bD+yNEF1RtchQCW/YXJzDLfk2kfaI0bcfMJjvOxLO1xBg52 A0NJLjwPAfbIg== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id 125961009FC; Mon, 18 Dec 2023 09:07:00 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Cc: Sean Young , linux-kernel@vger.kernel.org Subject: [PATCH v9 2/6] pwm: Replace ENOTSUPP with EOPNOTSUPP Date: Mon, 18 Dec 2023 09:06:43 +0000 Message-ID: <7d6c10b52bbb29925fff9d2f16788a65c138921e.1702890244.git.sean@mess.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 According to Documentation/dev-tools/checkpatch.rst ENOTSUPP is not recommended and EOPNOTSUPP should be used instead. Signed-off-by: Sean Young --- include/linux/pwm.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/pwm.h b/include/linux/pwm.h index b64b8a82415c..c9cb87b59ac8 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -407,12 +407,12 @@ static inline int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) { might_sleep(); - return -ENOTSUPP; + return -EOPNOTSUPP; } static inline int pwm_adjust_config(struct pwm_device *pwm) { - return -ENOTSUPP; + return -EOPNOTSUPP; } static inline int pwm_config(struct pwm_device *pwm, int duty_ns, From patchwork Mon Dec 18 09:06:44 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496423 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 837BC111A1; Mon, 18 Dec 2023 09:07:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="Q8Q++5gh"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="VZANn3yQ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890436; bh=4Uv9T6s4wh/LXg7ZHtJ7w1pHCYlvw7d96NQ/caKWDUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Q8Q++5ghCmF2m4LEceslU3Tkgl3mmWb2WZuc8OQ+tuuFW/NseyyesI/r+aqOo6RxW zJfIh6EhLECuP1rgJ97JqIv+KPY/r2bEmCpsiUy+DAq+8G08ZfZadZFIBlgfvHX6N3 eUIanTzwcjF4F6pUuwxWjLlhzxWxp2t5uzVV7hWOKMFXYvcC4i6PRXnCqQ823A3faN as5fNmFmxwxNrw+2vGEUx7JYmdnbxnIfmnK5NBnQpsb79xcyehGhM+sbSifVxRBRX7 AWyr0vR0mhkBQLLj9D/sG0J5ilDVm7Mg8wHRPD6jPhm8taoZjvJOBbOUHF2/APG26y IwD0UHTOzgJwg== Received: by gofer.mess.org (Postfix, from userid 501) id AE980100A00; Mon, 18 Dec 2023 09:07:16 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890420; bh=4Uv9T6s4wh/LXg7ZHtJ7w1pHCYlvw7d96NQ/caKWDUg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VZANn3yQEyw65xlkedEQD3QAHxG8/Oyqw0lIhoD6YcuN+B3IBtgNEWv80iTLycZ23 d4nJTNK5CJoCnKSDjP+N7x2rkgxHyf4+TYvyC0xW4rTNpfyriYwgMHdJ2ZZ8YCoSZs S9RTBhtWAUOv2jcnAKlO/jMWkeEMD8+dYcTMY6+9ygh6jUtl6npONx6BwI+Nm9xh8Q ge5FiYXgps6T4bGX25SUNs55g/VuyEYoZ5Hs7oAyzPlIgwupgjxaulcyrFjPZQZ3uO CSuGM0VwRkCHTSXMbRpFjPl/qjjWGmp1dZKOQfXSjScsMirvAo2NA4Cnj7SNudgJd+ ZhxHUGJE1VPOg== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id 436401000CC; Mon, 18 Dec 2023 09:07:00 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Cc: Sean Young , linux-kernel@vger.kernel.org Subject: [PATCH v9 3/6] pwm: renesas: Remove unused include Date: Mon, 18 Dec 2023 09:06:44 +0000 Message-ID: X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 No mutex is used in this driver. Reviewed-by: Uwe Kleine-König Signed-off-by: Sean Young --- drivers/pwm/pwm-renesas-tpu.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/pwm/pwm-renesas-tpu.c b/drivers/pwm/pwm-renesas-tpu.c index ce92db1f8511..28265fdfc92a 100644 --- a/drivers/pwm/pwm-renesas-tpu.c +++ b/drivers/pwm/pwm-renesas-tpu.c @@ -11,7 +11,6 @@ #include #include #include -#include #include #include #include From patchwork Mon Dec 18 09:06:45 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496425 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0D71111C95; Mon, 18 Dec 2023 09:07:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="FOxTn7/a"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="I4H5flPJ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890438; bh=nq08shY4F84JWnlQ3SSHlueQDTZg9R3tBoXVvnOsM60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FOxTn7/aDUtOeUOzjNz5FSNs+NWeUi6NUfYs9zTgeX0pU5cBCoTQK9FdfleLSjnwD fbUwRl47+2NyCUkSQAOE0WOTkJzEzQUyFXrPMtAMj4THzT0KkuUfuI04FYP3Y/u8RB IuJoDUgsEGm5xj1cFNvWtu7UegW7goaz8qy+v8664SNhan7jmFKGf2xm0KMcC/PVIF dirRu4u/7l2SGwFqg6ht/U45BP5W93sSgmPKNXih/H6K/8h69zgL+3or5kDjkHjvA3 CuLS5evuFQZQ+41yRYPCh0XbcMdhFAk5LiAFarMrMgXFmeM1s1r2a517ucmk1mjH9n vT+kd8Se9csrA== Received: by gofer.mess.org (Postfix, from userid 501) id 1A937100A09; Mon, 18 Dec 2023 09:07:18 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890420; bh=nq08shY4F84JWnlQ3SSHlueQDTZg9R3tBoXVvnOsM60=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=I4H5flPJJAIwcRSTQGENETb9ftnG6shx2tMwk799sk5aFg+eehZcD45atMqdSani+ ZIFR8g+2jRJ5d2LRNykgt2wh68Wi7Bmrzg4CngsbL8YdfraNfQztKEfJV5Lvm6xB5H p4q8pjE/edXZFixXIbuF/1Nrq3OpiOKhw7mWqObWKCde+sOJcrgnVlw+EdzizgUMQi yzdSzBT0rNXkoFfcoGMpNUyFa11roD+IvLCh6uVBqGOEJwAu3xfl7vAEpUJ4EU/ikx VjivjpQXOs2lbI8A+sffdR8AbBCmC7ixpCx5SoA4fciN21UNzowdVUboLewc8lueRy n5EvfsdZ9WVsw== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id B65781002A3; Mon, 18 Dec 2023 09:07:00 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Jonathan Corbet Cc: Sean Young , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v9 4/6] pwm: Make it possible to apply PWM changes in atomic context Date: Mon, 18 Dec 2023 09:06:45 +0000 Message-ID: <2a08b7876059f30c5c081d02978876022fa8d3ea.1702890244.git.sean@mess.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Some PWM devices require sleeping, for example if the pwm device is connected over I2C. However, many PWM devices could be used from atomic context, e.g. memory mapped PWM. This is useful for, for example, the pwm-ir-tx driver which requires precise timing. Sleeping causes havoc with the generated IR signal. Since not all PWM devices can support atomic context, we also add a pwm_might_sleep() function to check if is not supported. Signed-off-by: Sean Young --- Documentation/driver-api/pwm.rst | 9 +++++ MAINTAINERS | 2 +- drivers/pwm/core.c | 62 ++++++++++++++++++++++++++------ include/linux/pwm.h | 25 +++++++++++++ 4 files changed, 86 insertions(+), 12 deletions(-) diff --git a/Documentation/driver-api/pwm.rst b/Documentation/driver-api/pwm.rst index f1d8197c8c43..3c28ccc4b611 100644 --- a/Documentation/driver-api/pwm.rst +++ b/Documentation/driver-api/pwm.rst @@ -46,6 +46,15 @@ After being requested, a PWM has to be configured using:: This API controls both the PWM period/duty_cycle config and the enable/disable state. +PWM devices can be used from atomic context, if the PWM does not sleep. You +can check if this the case with:: + + bool pwm_might_sleep(struct pwm_device *pwm); + +If false, the PWM can also be configured from atomic context with:: + + int pwm_apply_atomic(struct pwm_device *pwm, struct pwm_state *state); + As a consumer, don't rely on the output's state for a disabled PWM. If it's easily possible, drivers are supposed to emit the inactive state, but some drivers cannot. If you rely on getting the inactive state, use .duty_cycle=0, diff --git a/MAINTAINERS b/MAINTAINERS index c58480595220..5342cf32d73f 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -17576,7 +17576,7 @@ F: drivers/video/backlight/pwm_bl.c F: include/dt-bindings/pwm/ F: include/linux/pwm.h F: include/linux/pwm_backlight.h -K: pwm_(config|apply_might_sleep|ops) +K: pwm_(config|apply_might_sleep|apply_atomic|ops) PXA GPIO DRIVER M: Robert Jarzmik diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index c2d78136625d..39bfc8b52294 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -433,24 +433,15 @@ static void pwm_apply_debug(struct pwm_device *pwm, } /** - * pwm_apply_might_sleep() - atomically apply a new state to a PWM device + * __pwm_apply() - atomically apply a new state to a PWM device * @pwm: PWM device * @state: new state to apply */ -int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) +static int __pwm_apply(struct pwm_device *pwm, const struct pwm_state *state) { struct pwm_chip *chip; int err; - /* - * Some lowlevel driver's implementations of .apply() make use of - * mutexes, also with some drivers only returning when the new - * configuration is active calling pwm_apply_might_sleep() from atomic context - * is a bad idea. So make it explicit that calling this function might - * sleep. - */ - might_sleep(); - if (!pwm || !state || !state->period || state->duty_cycle > state->period) return -EINVAL; @@ -479,8 +470,57 @@ int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) return 0; } + +/** + * pwm_apply_might_sleep() - atomically apply a new state to a PWM device + * Cannot be used in atomic context. + * @pwm: PWM device + * @state: new state to apply + */ +int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) +{ + int err; + + /* + * Some lowlevel driver's implementations of .apply() make use of + * mutexes, also with some drivers only returning when the new + * configuration is active calling pwm_apply_might_sleep() from atomic context + * is a bad idea. So make it explicit that calling this function might + * sleep. + */ + might_sleep(); + + if (IS_ENABLED(CONFIG_PWM_DEBUG) && pwm->chip->atomic) { + /* + * Catch any drivers that have been marked as atomic but + * that will sleep anyway. + */ + non_block_start(); + err = __pwm_apply(pwm, state); + non_block_end(); + } else { + err = __pwm_apply(pwm, state); + } + + return err; +} EXPORT_SYMBOL_GPL(pwm_apply_might_sleep); +/** + * pwm_apply_atomic() - apply a new state to a PWM device from atomic context + * Not all PWM devices support this function, check with pwm_might_sleep(). + * @pwm: PWM device + * @state: new state to apply + */ +int pwm_apply_atomic(struct pwm_device *pwm, const struct pwm_state *state) +{ + WARN_ONCE(!pwm->chip->atomic, + "sleeping PWM driver used in atomic context\n"); + + return __pwm_apply(pwm, state); +} +EXPORT_SYMBOL_GPL(pwm_apply_atomic); + /** * pwm_capture() - capture and report a PWM signal * @pwm: PWM device diff --git a/include/linux/pwm.h b/include/linux/pwm.h index c9cb87b59ac8..495af3627939 100644 --- a/include/linux/pwm.h +++ b/include/linux/pwm.h @@ -285,6 +285,7 @@ struct pwm_ops { * @npwm: number of PWMs controlled by this chip * @of_xlate: request a PWM device given a device tree PWM specifier * @of_pwm_n_cells: number of cells expected in the device tree PWM specifier + * @atomic: can the driver's ->apply() be called in atomic context * @pwms: array of PWM devices allocated by the framework */ struct pwm_chip { @@ -297,6 +298,7 @@ struct pwm_chip { struct pwm_device * (*of_xlate)(struct pwm_chip *chip, const struct of_phandle_args *args); unsigned int of_pwm_n_cells; + bool atomic; /* only used internally by the PWM framework */ struct pwm_device *pwms; @@ -305,6 +307,7 @@ struct pwm_chip { #if IS_ENABLED(CONFIG_PWM) /* PWM user APIs */ int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state); +int pwm_apply_atomic(struct pwm_device *pwm, const struct pwm_state *state); int pwm_adjust_config(struct pwm_device *pwm); /** @@ -375,6 +378,17 @@ static inline void pwm_disable(struct pwm_device *pwm) pwm_apply_might_sleep(pwm, &state); } +/** + * pwm_might_sleep() - is pwm_apply_atomic() supported? + * @pwm: PWM device + * + * Returns: false if pwm_apply_atomic() can be called from atomic context. + */ +static inline bool pwm_might_sleep(struct pwm_device *pwm) +{ + return !pwm->chip->atomic; +} + /* PWM provider APIs */ int pwm_capture(struct pwm_device *pwm, struct pwm_capture *result, unsigned long timeout); @@ -403,6 +417,11 @@ struct pwm_device *devm_fwnode_pwm_get(struct device *dev, struct fwnode_handle *fwnode, const char *con_id); #else +static inline bool pwm_might_sleep(struct pwm_device *pwm) +{ + return true; +} + static inline int pwm_apply_might_sleep(struct pwm_device *pwm, const struct pwm_state *state) { @@ -410,6 +429,12 @@ static inline int pwm_apply_might_sleep(struct pwm_device *pwm, return -EOPNOTSUPP; } +static inline int pwm_apply_atomic(struct pwm_device *pwm, + const struct pwm_state *state) +{ + return -EOPNOTSUPP; +} + static inline int pwm_adjust_config(struct pwm_device *pwm) { return -EOPNOTSUPP; From patchwork Mon Dec 18 09:06:46 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496426 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 596DF12B8F; Mon, 18 Dec 2023 09:07:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="Ef95AFuj"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="JJhq0UHZ" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890439; bh=LjaOwH9UGD1qjsd41DylO0EFQhH3+r2HBaFpyCOGEtM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Ef95AFujTW+p0IPeSunN4wL1NmrFEdPxGTqU1UDz3ohrYnK1ZXY49IlCVT0U627Ld +LOZicKSUxhRGhg8cnmwsqQfTzdEwiL/8khv9l5+0G1pf874Iko8IHSJSAlxShjqSO jX+/Epp/0F0Fzc1vaiU09iQcHQUkjAju8rDsHmI2HpDosxRKscHnJjsHuIBPsXGXDt zKbI0k308EY0PoVZeamuhwbFOtN6e/4p/QTRzle4QKcLm5WCxGFUG7+vyFZ7ysDVB7 0KCLvIiSb8slvxkn/eXyGAbjq4pQgUh5t8Yt0iHfsKYuHNVWRw8eojsPX07TXnLhcu 6CZUgSU41cdyQ== Received: by gofer.mess.org (Postfix, from userid 501) id CF0FF100A06; Mon, 18 Dec 2023 09:07:19 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890421; bh=LjaOwH9UGD1qjsd41DylO0EFQhH3+r2HBaFpyCOGEtM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JJhq0UHZr/w0Fs0e2iqfz0fDUdsaK8ijm7rmAq6jlcaWL+tfnln7/R8UjjYXsh0ho 1dWUZXIVosvb+ntlRapjUN8BHaCRcNKsOrlxha0bC33sKh5Bprh6zO/Mt6Si2AB85l q93/sAUXg+lwW2mIzIH6bYxV4JsCfuDOhHU2hur8EieyBKpB6g8zS7uLc4KQI5YXP6 hhBrEKM1ZSjzubRWOR6hKY4JlW0i350kGAYnylA5OUyFsrYrZPKzDbw+TgVaE6k5pA MEH8muqZBtdp+J5T10TQ51vNrwitFGUXGLa9n++K8ngJYKMT4KSIGg+iJQRHYz8w1Z xuNrGjOUGjLLw== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id 06D361009FD; Mon, 18 Dec 2023 09:07:01 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Florian Fainelli , Ray Jui , Scott Branden , Broadcom internal kernel review list Cc: Sean Young , linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v9 5/6] pwm: bcm2835: Allow PWM driver to be used in atomic context Date: Mon, 18 Dec 2023 09:06:46 +0000 Message-ID: <5249bb5d6c067692e4cd09573ced2df58966693b.1702890244.git.sean@mess.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 clk_get_rate() may do a mutex lock. Fetch the clock rate once, and prevent rate changes using clk_rate_exclusive_get(). Signed-off-by: Sean Young Reviewed-by: Florian Fainelli --- drivers/pwm/pwm-bcm2835.c | 40 +++++++++++++++++++++++++++++---------- 1 file changed, 30 insertions(+), 10 deletions(-) diff --git a/drivers/pwm/pwm-bcm2835.c b/drivers/pwm/pwm-bcm2835.c index ab30667f4f95..e556ae300c82 100644 --- a/drivers/pwm/pwm-bcm2835.c +++ b/drivers/pwm/pwm-bcm2835.c @@ -28,6 +28,7 @@ struct bcm2835_pwm { struct device *dev; void __iomem *base; struct clk *clk; + unsigned long rate; }; static inline struct bcm2835_pwm *to_bcm2835_pwm(struct pwm_chip *chip) @@ -63,17 +64,11 @@ static int bcm2835_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, { struct bcm2835_pwm *pc = to_bcm2835_pwm(chip); - unsigned long rate = clk_get_rate(pc->clk); unsigned long long period_cycles; u64 max_period; u32 val; - if (!rate) { - dev_err(pc->dev, "failed to get clock rate\n"); - return -EINVAL; - } - /* * period_cycles must be a 32 bit value, so period * rate / NSEC_PER_SEC * must be <= U32_MAX. As U32_MAX * NSEC_PER_SEC < U64_MAX the @@ -88,13 +83,13 @@ static int bcm2835_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, * <=> period < ((U32_MAX * NSEC_PER_SEC + NSEC_PER_SEC/2) / rate * <=> period <= ceil((U32_MAX * NSEC_PER_SEC + NSEC_PER_SEC/2) / rate) - 1 */ - max_period = DIV_ROUND_UP_ULL((u64)U32_MAX * NSEC_PER_SEC + NSEC_PER_SEC / 2, rate) - 1; + max_period = DIV_ROUND_UP_ULL((u64)U32_MAX * NSEC_PER_SEC + NSEC_PER_SEC / 2, pc->rate) - 1; if (state->period > max_period) return -EINVAL; /* set period */ - period_cycles = DIV_ROUND_CLOSEST_ULL(state->period * rate, NSEC_PER_SEC); + period_cycles = DIV_ROUND_CLOSEST_ULL(state->period * pc->rate, NSEC_PER_SEC); /* don't accept a period that is too small */ if (period_cycles < PERIOD_MIN) @@ -103,7 +98,7 @@ static int bcm2835_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, writel(period_cycles, pc->base + PERIOD(pwm->hwpwm)); /* set duty cycle */ - val = DIV_ROUND_CLOSEST_ULL(state->duty_cycle * rate, NSEC_PER_SEC); + val = DIV_ROUND_CLOSEST_ULL(state->duty_cycle * pc->rate, NSEC_PER_SEC); writel(val, pc->base + DUTY(pwm->hwpwm)); /* set polarity */ @@ -151,16 +146,40 @@ static int bcm2835_pwm_probe(struct platform_device *pdev) return dev_err_probe(&pdev->dev, PTR_ERR(pc->clk), "clock not found\n"); + ret = clk_rate_exclusive_get(pc->clk); + if (ret) + return dev_err_probe(&pdev->dev, ret, + "fail to get exclusive rate\n"); + + pc->rate = clk_get_rate(pc->clk); + if (!pc->rate) { + clk_rate_exclusive_put(pc->clk); + return dev_err_probe(&pdev->dev, -EINVAL, + "failed to get clock rate\n"); + } + pc->chip.dev = &pdev->dev; pc->chip.ops = &bcm2835_pwm_ops; + pc->chip.atomic = true; pc->chip.npwm = 2; platform_set_drvdata(pdev, pc); ret = devm_pwmchip_add(&pdev->dev, &pc->chip); - if (ret < 0) + if (ret < 0) { + clk_rate_exclusive_put(pc->clk); return dev_err_probe(&pdev->dev, ret, "failed to add pwmchip\n"); + } + + return 0; +} + +static int bcm2835_pwm_remove(struct platform_device *pdev) +{ + struct bcm2835_pwm *pc = platform_get_drvdata(pdev); + + clk_rate_exclusive_put(pc->clk); return 0; } @@ -197,6 +216,7 @@ static struct platform_driver bcm2835_pwm_driver = { .pm = pm_ptr(&bcm2835_pwm_pm_ops), }, .probe = bcm2835_pwm_probe, + .remove = bcm2835_pwm_remove, }; module_platform_driver(bcm2835_pwm_driver); From patchwork Mon Dec 18 09:06:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Young X-Patchwork-Id: 13496427 Received: from gofer.mess.org (gofer.mess.org [88.97.38.141]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 958CF12B9E; Mon, 18 Dec 2023 09:07:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=mess.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mess.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="EpbINsD2"; dkim=pass (2048-bit key) header.d=mess.org header.i=@mess.org header.b="KI/vNOLV" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890440; bh=hUUyx2Ra/j0PfiviV+OXUA5B+Rr5c5IfU2vtPHgn40o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EpbINsD2V6YvKtDU7RoAm2Bv9YQSnNbOpk6xPAPJ/76rPpxtRWSYGW+6lEl8bxKOv GJzuHSMaV+nkfVADJnKQ64HNUUQTOZ9WQV+nE9QpJoxc3f1Pycpz7WVs7aFA+teN8q oj+B1IIu/lUigZesYaO1i7UC7xf5A7ilIKr0uTECvqqj6cWEjjuwdrek/pKz6ajR+/ wuMqbsbLiJCUhNXWIWwW6/4AAqR+gXXxfWKuhbozSzVaMjczwHyQNv4vfxWkod13Vb TPCVX5XkNAMD8yseReccY5WNJNGHKmHLY9SBRKngUA1r5ZNbIqopOo+W1HYvc8tGAb a/0DmS6HwX9VQ== Received: by gofer.mess.org (Postfix, from userid 501) id 1D84B100A00; Mon, 18 Dec 2023 09:07:20 +0000 (GMT) X-Spam-Level: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=mess.org; s=2020; t=1702890421; bh=hUUyx2Ra/j0PfiviV+OXUA5B+Rr5c5IfU2vtPHgn40o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KI/vNOLV/Bn3e+bPRS5X9dubMgKyM6izosHjarzB4iO0rSXjvsZm5F40sO4RQ93TF jgC87BcntD2ahnJbYy+z/o1HGPfg+qbYBlmdIJk6HKC7Kyv4fd/I1uBup+lh2MACX6 DwUgdP7E4PfIJ37YBWnSPMM7QrWU3KKQYo5nY0DB/4LfhQp7Q6zWFcEvDy1/0k0ViD 9BaEWnOYs7JEXDEUQ9qoYbAA1LrvthHBVGGPrzNCICwvUADgZc2uSTVYAcT6WAQhgN 7VlN7myn0V+CC8hRYIHsHVfmbpW7AhEkA/k48OuvpTt5jt73H8PiZHChuGsfKdzAW7 rL/lqKzjIcMIw== Received: from localhost.localdomain (bigcore-79.local [IPv6:2a02:8011:d000:212:ca7f:54ff:fe51:14d6]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by gofer.mess.org (Postfix) with ESMTPSA id 4D6881009FF; Mon, 18 Dec 2023 09:07:01 +0000 (GMT) From: Sean Young To: linux-media@vger.kernel.org, linux-pwm@vger.kernel.org, Ivaylo Dimitrov , Thierry Reding , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , Sean Young , Mauro Carvalho Chehab Cc: linux-kernel@vger.kernel.org Subject: [PATCH v9 6/6] media: pwm-ir-tx: Trigger edges from hrtimer interrupt context Date: Mon, 18 Dec 2023 09:06:47 +0000 Message-ID: <13a4f0ba8e3b2c45b07d1003e736aa7ee3487523.1702890244.git.sean@mess.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This makes the generated IR much more precise. Before this change, the driver is unreliable and many users opted to use gpio-ir-tx instead. Signed-off-by: Sean Young --- drivers/media/rc/pwm-ir-tx.c | 83 +++++++++++++++++++++++++++++++++--- 1 file changed, 78 insertions(+), 5 deletions(-) diff --git a/drivers/media/rc/pwm-ir-tx.c b/drivers/media/rc/pwm-ir-tx.c index cf51e2760975..fe368aebbc13 100644 --- a/drivers/media/rc/pwm-ir-tx.c +++ b/drivers/media/rc/pwm-ir-tx.c @@ -10,6 +10,8 @@ #include #include #include +#include +#include #include #define DRIVER_NAME "pwm-ir-tx" @@ -17,8 +19,14 @@ struct pwm_ir { struct pwm_device *pwm; - unsigned int carrier; - unsigned int duty_cycle; + struct hrtimer timer; + struct completion tx_done; + struct pwm_state *state; + u32 carrier; + u32 duty_cycle; + const unsigned int *txbuf; + unsigned int txbuf_len; + unsigned int txbuf_index; }; static const struct of_device_id pwm_ir_of_match[] = { @@ -49,8 +57,8 @@ static int pwm_ir_set_carrier(struct rc_dev *dev, u32 carrier) return 0; } -static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf, - unsigned int count) +static int pwm_ir_tx_sleep(struct rc_dev *dev, unsigned int *txbuf, + unsigned int count) { struct pwm_ir *pwm_ir = dev->priv; struct pwm_device *pwm = pwm_ir->pwm; @@ -82,6 +90,62 @@ static int pwm_ir_tx(struct rc_dev *dev, unsigned int *txbuf, return count; } +static int pwm_ir_tx_atomic(struct rc_dev *dev, unsigned int *txbuf, + unsigned int count) +{ + struct pwm_ir *pwm_ir = dev->priv; + struct pwm_device *pwm = pwm_ir->pwm; + struct pwm_state state; + + pwm_init_state(pwm, &state); + + state.period = DIV_ROUND_CLOSEST(NSEC_PER_SEC, pwm_ir->carrier); + pwm_set_relative_duty_cycle(&state, pwm_ir->duty_cycle, 100); + + pwm_ir->txbuf = txbuf; + pwm_ir->txbuf_len = count; + pwm_ir->txbuf_index = 0; + pwm_ir->state = &state; + + hrtimer_start(&pwm_ir->timer, 0, HRTIMER_MODE_REL); + + wait_for_completion(&pwm_ir->tx_done); + + return count; +} + +static enum hrtimer_restart pwm_ir_timer(struct hrtimer *timer) +{ + struct pwm_ir *pwm_ir = container_of(timer, struct pwm_ir, timer); + ktime_t now; + + /* + * If we happen to hit an odd latency spike, loop through the + * pulses until we catch up. + */ + do { + u64 ns; + + pwm_ir->state->enabled = !(pwm_ir->txbuf_index % 2); + pwm_apply_atomic(pwm_ir->pwm, pwm_ir->state); + + if (pwm_ir->txbuf_index >= pwm_ir->txbuf_len) { + complete(&pwm_ir->tx_done); + + return HRTIMER_NORESTART; + } + + ns = US_TO_NS(pwm_ir->txbuf[pwm_ir->txbuf_index]); + hrtimer_add_expires_ns(timer, ns); + + pwm_ir->txbuf_index++; + + now = timer->base->get_time(); + } while (hrtimer_get_expires_tv64(timer) < now); + + return HRTIMER_RESTART; +} + static int pwm_ir_probe(struct platform_device *pdev) { struct pwm_ir *pwm_ir; @@ -103,10 +167,19 @@ static int pwm_ir_probe(struct platform_device *pdev) if (!rcdev) return -ENOMEM; + if (pwm_might_sleep(pwm_ir->pwm)) { + dev_info(&pdev->dev, "TX will not be accurate as PWM device might sleep\n"); + rcdev->tx_ir = pwm_ir_tx_sleep; + } else { + init_completion(&pwm_ir->tx_done); + hrtimer_init(&pwm_ir->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + pwm_ir->timer.function = pwm_ir_timer; + rcdev->tx_ir = pwm_ir_tx_atomic; + } + rcdev->priv = pwm_ir; rcdev->driver_name = DRIVER_NAME; rcdev->device_name = DEVICE_NAME; - rcdev->tx_ir = pwm_ir_tx; rcdev->s_tx_duty_cycle = pwm_ir_set_duty_cycle; rcdev->s_tx_carrier = pwm_ir_set_carrier;