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From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To: Hans de Goede <hdegoede@redhat.com>
Cc: "Thierry Reding" <thierry.reding@gmail.com>,
	"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
	"Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>,
	"Rafael J . Wysocki" <rjw@rjwysocki.net>,
	"Len Brown" <lenb@kernel.org>,
	linux-pwm@vger.kernel.org,
	intel-gfx <intel-gfx@lists.freedesktop.org>,
	dri-devel@lists.freedesktop.org,
	"Mika Westerberg" <mika.westerberg@linux.intel.com>,
	linux-acpi@vger.kernel.org
Subject: Re: [PATCH v5 11/16] pwm: crc: Implement apply() method to support the new atomic PWM API
Date: Wed, 29 Jul 2020 13:51:29 +0300
Message-ID: <20200729105129.GS3703480@smile.fi.intel.com> (raw)
In-Reply-To: <20200717133753.127282-12-hdegoede@redhat.com>

On Fri, Jul 17, 2020 at 03:37:48PM +0200, Hans de Goede wrote:
> Replace the enable, disable and config pwm_ops with an apply op,
> to support the new atomic PWM API.

I didn't notice any visible issue, so
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

Perhaps you may consider reusing existing _enable() / _disable(), but I don't
see if there will be nice improvement (maybe if in on of the previous patches
you also add an error handling to them first).

> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
> ---
> Changes in v3:
> - Keep crc_pwm_calc_clk_div() helper to avoid needless churn
> ---
>  drivers/pwm/pwm-crc.c | 89 ++++++++++++++++++++++++++-----------------
>  1 file changed, 53 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/pwm/pwm-crc.c b/drivers/pwm/pwm-crc.c
> index b72008c9b072..8a7f4707279c 100644
> --- a/drivers/pwm/pwm-crc.c
> +++ b/drivers/pwm/pwm-crc.c
> @@ -51,59 +51,76 @@ static int crc_pwm_calc_clk_div(int period_ns)
>  	return clk_div;
>  }
>  
> -static int crc_pwm_enable(struct pwm_chip *c, struct pwm_device *pwm)
> +static int crc_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
> +			 const struct pwm_state *state)
>  {
> -	struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
> -	int div = crc_pwm_calc_clk_div(pwm_get_period(pwm));
> -
> -	regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, div | PWM_OUTPUT_ENABLE);
> -	regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 1);
> -
> -	return 0;
> -}
> -
> -static void crc_pwm_disable(struct pwm_chip *c, struct pwm_device *pwm)
> -{
> -	struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
> -	int div = crc_pwm_calc_clk_div(pwm_get_period(pwm));
> -
> -	regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 0);
> -	regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, div);
> -}
> -
> -static int crc_pwm_config(struct pwm_chip *c, struct pwm_device *pwm,
> -			  int duty_ns, int period_ns)
> -{
> -	struct crystalcove_pwm *crc_pwm = to_crc_pwm(c);
> +	struct crystalcove_pwm *crc_pwm = to_crc_pwm(chip);
>  	struct device *dev = crc_pwm->chip.dev;
> -	int level;
> +	int err;
>  
> -	if (period_ns > PWM_MAX_PERIOD_NS) {
> +	if (state->period > PWM_MAX_PERIOD_NS) {
>  		dev_err(dev, "un-supported period_ns\n");
>  		return -EINVAL;
>  	}
>  
> -	if (pwm_get_period(pwm) != period_ns) {
> -		int clk_div = crc_pwm_calc_clk_div(period_ns);
> +	if (state->polarity != PWM_POLARITY_NORMAL)
> +		return -EOPNOTSUPP;
> +
> +	if (pwm_is_enabled(pwm) && !state->enabled) {
> +		err = regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 0);
> +		if (err) {
> +			dev_err(dev, "Error writing BACKLIGHT_EN %d\n", err);
> +			return err;
> +		}
> +	}
> +
> +	if (pwm_get_duty_cycle(pwm) != state->duty_cycle ||
> +	    pwm_get_period(pwm) != state->period) {
> +		int level = state->duty_cycle * PWM_MAX_LEVEL / state->period;
>  
> +		err = regmap_write(crc_pwm->regmap, PWM0_DUTY_CYCLE, level);
> +		if (err) {
> +			dev_err(dev, "Error writing PWM0_DUTY_CYCLE %d\n", err);
> +			return err;
> +		}
> +	}
> +
> +	if (pwm_is_enabled(pwm) && state->enabled &&
> +	    pwm_get_period(pwm) != state->period) {
>  		/* changing the clk divisor, clear PWM_OUTPUT_ENABLE first */
> -		regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, 0);
> +		err = regmap_write(crc_pwm->regmap, PWM0_CLK_DIV, 0);
> +		if (err) {
> +			dev_err(dev, "Error writing PWM0_CLK_DIV %d\n", err);
> +			return err;
> +		}
> +	}
>  
> -		regmap_write(crc_pwm->regmap, PWM0_CLK_DIV,
> -					clk_div | PWM_OUTPUT_ENABLE);
> +	if (pwm_get_period(pwm) != state->period ||
> +	    pwm_is_enabled(pwm) != state->enabled) {
> +		int clk_div = crc_pwm_calc_clk_div(state->period);
> +		int pwm_output_enable = state->enabled ? PWM_OUTPUT_ENABLE : 0;
> +
> +		err = regmap_write(crc_pwm->regmap, PWM0_CLK_DIV,
> +				   clk_div | pwm_output_enable);
> +		if (err) {
> +			dev_err(dev, "Error writing PWM0_CLK_DIV %d\n", err);
> +			return err;
> +		}
>  	}
>  
> -	/* change the pwm duty cycle */
> -	level = duty_ns * PWM_MAX_LEVEL / period_ns;
> -	regmap_write(crc_pwm->regmap, PWM0_DUTY_CYCLE, level);
> +	if (!pwm_is_enabled(pwm) && state->enabled) {
> +		err = regmap_write(crc_pwm->regmap, BACKLIGHT_EN, 1);
> +		if (err) {
> +			dev_err(dev, "Error writing BACKLIGHT_EN %d\n", err);
> +			return err;
> +		}
> +	}
>  
>  	return 0;
>  }
>  
>  static const struct pwm_ops crc_pwm_ops = {
> -	.config = crc_pwm_config,
> -	.enable = crc_pwm_enable,
> -	.disable = crc_pwm_disable,
> +	.apply = crc_pwm_apply,
>  };
>  
>  static int crystalcove_pwm_probe(struct platform_device *pdev)
> -- 
> 2.26.2
> 

-- 
With Best Regards,
Andy Shevchenko



  reply index

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-17 13:37 [PATCH v5 00/16] acpi/pwm/i915: Convert pwm-crc and i915 driver's PWM code to use the " Hans de Goede
2020-07-17 13:37 ` [PATCH v5 01/16] ACPI / LPSS: Resume Cherry Trail PWM controller in no-irq phase Hans de Goede
2020-07-17 13:37 ` [PATCH v5 02/16] ACPI / LPSS: Save Cherry Trail PWM ctx registers only once (at activation) Hans de Goede
2020-07-17 13:37 ` [PATCH v5 03/16] pwm: lpss: Fix off by one error in base_unit math in pwm_lpss_prepare() Hans de Goede
2020-07-17 13:37 ` [PATCH v5 04/16] pwm: lpss: Add range limit check for the base_unit register value Hans de Goede
2020-07-17 13:37 ` [PATCH v5 05/16] pwm: lpss: Add pwm_lpss_prepare_enable() helper Hans de Goede
2020-07-28 18:45   ` Andy Shevchenko
2020-07-28 19:49     ` Hans de Goede
2020-07-17 13:37 ` [PATCH v5 06/16] pwm: lpss: Use pwm_lpss_apply() when restoring state on resume Hans de Goede
2020-07-28 18:57   ` Andy Shevchenko
2020-07-28 19:55     ` Hans de Goede
2020-07-29  8:12       ` Andy Shevchenko
2020-08-02 20:51         ` Hans de Goede
2020-08-03  8:41           ` Andy Shevchenko
2020-07-17 13:37 ` [PATCH v5 07/16] pwm: crc: Fix period / duty_cycle times being off by a factor of 256 Hans de Goede
2020-07-28 19:36   ` Andy Shevchenko
2020-07-28 20:00     ` Hans de Goede
2020-07-29  8:13   ` Andy Shevchenko
2020-07-17 13:37 ` [PATCH v5 08/16] pwm: crc: Fix off-by-one error in the clock-divider calculations Hans de Goede
2020-07-29 10:28   ` Andy Shevchenko
2020-07-17 13:37 ` [PATCH v5 09/16] pwm: crc: Fix period changes not having any effect Hans de Goede
2020-07-29 10:30   ` Andy Shevchenko
2020-07-17 13:37 ` [PATCH v5 10/16] pwm: crc: Enable/disable PWM output on enable/disable Hans de Goede
2020-07-29 10:32   ` Andy Shevchenko
2020-07-17 13:37 ` [PATCH v5 11/16] pwm: crc: Implement apply() method to support the new atomic PWM API Hans de Goede
2020-07-29 10:51   ` Andy Shevchenko [this message]
2020-07-17 13:37 ` [PATCH v5 12/16] pwm: crc: Implement get_state() method Hans de Goede
2020-07-17 13:37 ` [PATCH v5 13/16] drm/i915: panel: Add get_vbt_pwm_freq() helper Hans de Goede
2020-07-17 13:37 ` [PATCH v5 14/16] drm/i915: panel: Honor the VBT PWM frequency for devs with an external PWM controller Hans de Goede
2020-07-17 13:44 ` [PATCH v5 15/16] drm/i915: panel: Honor the VBT PWM min setting " Hans de Goede
2020-07-17 13:44   ` [PATCH v5 16/16] drm/i915: panel: Use atomic PWM API " Hans de Goede
2020-07-27  7:41 ` [PATCH v5 00/16] acpi/pwm/i915: Convert pwm-crc and i915 driver's PWM code to use the atomic PWM API Thierry Reding
2020-07-29  8:23   ` Andy Shevchenko
2020-07-29  9:32     ` Hans de Goede
2020-07-30  9:26       ` Thierry Reding
2020-08-01 14:33         ` Hans de Goede
2020-07-29 10:54 ` Andy Shevchenko
2020-08-01 14:38   ` Hans de Goede
2020-08-02 11:25     ` Andy Shevchenko
2020-08-02 19:43       ` Hans de Goede

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