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* [PATCH v8 03/12] hwmon: pwm-fan: Use 64-bit division macro
       [not found] <cover.1583889178.git.gurus@codeaurora.org>
@ 2020-03-11  1:41 ` Guru Das Srinagesh
  2020-03-11 15:08   ` Guenter Roeck
  0 siblings, 1 reply; 2+ messages in thread
From: Guru Das Srinagesh @ 2020-03-11  1:41 UTC (permalink / raw)
  To: linux-pwm
  Cc: Thierry Reding, Uwe Kleine-König, Subbaraman Narayanamurthy,
	linux-kernel, Guru Das Srinagesh, Kamil Debski,
	Bartlomiej Zolnierkiewicz, Jean Delvare, Guenter Roeck,
	Liam Girdwood, Mark Brown, linux-hwmon

Since the PWM framework is switching struct pwm_args.period's datatype
to u64, prepare for this transition by using DIV_ROUND_UP_ULL to handle
a 64-bit dividend.

Cc: Kamil Debski <kamil@wypas.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: linux-hwmon@vger.kernel.org

Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
---
 drivers/hwmon/pwm-fan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
index 42ffd2e..283423a 100644
--- a/drivers/hwmon/pwm-fan.c
+++ b/drivers/hwmon/pwm-fan.c
@@ -437,7 +437,7 @@ static int pwm_fan_resume(struct device *dev)
 		return 0;
 
 	pwm_get_args(ctx->pwm, &pargs);
-	duty = DIV_ROUND_UP(ctx->pwm_value * (pargs.period - 1), MAX_PWM);
+	duty = DIV_ROUND_UP_ULL(ctx->pwm_value * (pargs.period - 1), MAX_PWM);
 	ret = pwm_config(ctx->pwm, duty, pargs.period);
 	if (ret)
 		return ret;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project


^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v8 03/12] hwmon: pwm-fan: Use 64-bit division macro
  2020-03-11  1:41 ` [PATCH v8 03/12] hwmon: pwm-fan: Use 64-bit division macro Guru Das Srinagesh
@ 2020-03-11 15:08   ` Guenter Roeck
  0 siblings, 0 replies; 2+ messages in thread
From: Guenter Roeck @ 2020-03-11 15:08 UTC (permalink / raw)
  To: Guru Das Srinagesh
  Cc: linux-pwm, Thierry Reding, Uwe Kleine-König,
	Subbaraman Narayanamurthy, linux-kernel, Kamil Debski,
	Bartlomiej Zolnierkiewicz, Jean Delvare, Liam Girdwood,
	Mark Brown, linux-hwmon

On Tue, Mar 10, 2020 at 06:41:12PM -0700, Guru Das Srinagesh wrote:
> Since the PWM framework is switching struct pwm_args.period's datatype
> to u64, prepare for this transition by using DIV_ROUND_UP_ULL to handle
> a 64-bit dividend.
> 
> Cc: Kamil Debski <kamil@wypas.org>
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
> Cc: Jean Delvare <jdelvare@suse.com>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Cc: Liam Girdwood <lgirdwood@gmail.com>
> Cc: Mark Brown <broonie@kernel.org>
> Cc: linux-hwmon@vger.kernel.org
> 
> Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>

Not sure if I entirely buy the use case, but then the performance
impact is minimal, at least for this driver, so

Acked-by: Guenter Roeck <linux@roeck-us.net>

Guenter

> ---
>  drivers/hwmon/pwm-fan.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/hwmon/pwm-fan.c b/drivers/hwmon/pwm-fan.c
> index 42ffd2e..283423a 100644
> --- a/drivers/hwmon/pwm-fan.c
> +++ b/drivers/hwmon/pwm-fan.c
> @@ -437,7 +437,7 @@ static int pwm_fan_resume(struct device *dev)
>  		return 0;
>  
>  	pwm_get_args(ctx->pwm, &pargs);
> -	duty = DIV_ROUND_UP(ctx->pwm_value * (pargs.period - 1), MAX_PWM);
> +	duty = DIV_ROUND_UP_ULL(ctx->pwm_value * (pargs.period - 1), MAX_PWM);
>  	ret = pwm_config(ctx->pwm, duty, pargs.period);
>  	if (ret)
>  		return ret;
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 

^ permalink raw reply	[flat|nested] 2+ messages in thread

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     [not found] <cover.1583889178.git.gurus@codeaurora.org>
2020-03-11  1:41 ` [PATCH v8 03/12] hwmon: pwm-fan: Use 64-bit division macro Guru Das Srinagesh
2020-03-11 15:08   ` Guenter Roeck

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