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From: Stephen Boyd <sboyd@kernel.org>
To: Maxime Ripard <maxime@cerno.tech>,
	Mike Turquette <mturquette@baylibre.com>
Cc: linux-clk@vger.kernel.org,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	Phil Elwell <phil@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dom Cobley <dom@raspberrypi.com>,
	dri-devel@lists.freedesktop.org,
	Maxime Ripard <maxime@cerno.tech>
Subject: Re: [PATCH v6 05/12] clk: Use clamp instead of open-coding our own
Date: Thu, 24 Feb 2022 14:51:00 -0800	[thread overview]
Message-ID: <20220224225102.1C688C340E9@smtp.kernel.org> (raw)
In-Reply-To: <20220223105600.1132593-6-maxime@cerno.tech>

Quoting Maxime Ripard (2022-02-23 02:55:53)
> The code in clk_set_rate_range() will, if the current rate is outside of
> the new range, will force it to the minimum or maximum.

s/will//

> 
> Since it's running under the condition that the rate is either lower
> than the minimum, or higher than the maximum, this is equivalent to
> using clamp, while being less readable. Let's switch to using clamp
> instead.
> 
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> ---
>  drivers/clk/clk.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 6c4e10209568..c15ee5070f52 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2388,11 +2388,7 @@ int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max)
>                  *   this corner case when determining the rate
>                  */
>  
> -               if (rate < min)
> -                       rate = min;
> -               else
> -                       rate = max;
> -
> +               rate = clamp(clk->core->req_rate, min, max);
>                 ret = clk_core_set_rate_nolock(clk->core, rate);
>                 if (ret) {

WARNING: multiple messages have this Message-ID (diff)
From: Stephen Boyd <sboyd@kernel.org>
To: Maxime Ripard <maxime@cerno.tech>,
	Mike Turquette <mturquette@baylibre.com>
Cc: Dom Cobley <dom@raspberrypi.com>,
	Tim Gover <tim.gover@raspberrypi.com>,
	Dave Stevenson <dave.stevenson@raspberrypi.com>,
	dri-devel@lists.freedesktop.org, linux-clk@vger.kernel.org,
	Maxime Ripard <maxime@cerno.tech>,
	Phil Elwell <phil@raspberrypi.com>
Subject: Re: [PATCH v6 05/12] clk: Use clamp instead of open-coding our own
Date: Thu, 24 Feb 2022 14:51:00 -0800	[thread overview]
Message-ID: <20220224225102.1C688C340E9@smtp.kernel.org> (raw)
In-Reply-To: <20220223105600.1132593-6-maxime@cerno.tech>

Quoting Maxime Ripard (2022-02-23 02:55:53)
> The code in clk_set_rate_range() will, if the current rate is outside of
> the new range, will force it to the minimum or maximum.

s/will//

> 
> Since it's running under the condition that the rate is either lower
> than the minimum, or higher than the maximum, this is equivalent to
> using clamp, while being less readable. Let's switch to using clamp
> instead.
> 
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>
> ---
>  drivers/clk/clk.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index 6c4e10209568..c15ee5070f52 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -2388,11 +2388,7 @@ int clk_set_rate_range(struct clk *clk, unsigned long min, unsigned long max)
>                  *   this corner case when determining the rate
>                  */
>  
> -               if (rate < min)
> -                       rate = min;
> -               else
> -                       rate = max;
> -
> +               rate = clamp(clk->core->req_rate, min, max);
>                 ret = clk_core_set_rate_nolock(clk->core, rate);
>                 if (ret) {

  reply	other threads:[~2022-02-24 22:51 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-02-23 10:55 [PATCH v6 00/12] clk: Improve clock range handling Maxime Ripard
2022-02-23 10:55 ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 01/12] clk: Fix clk_hw_get_clk() when dev is NULL Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 02/12] clk: Introduce Kunit Tests for the framework Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 22:50   ` Daniel Latypov
2022-02-23 22:50     ` Daniel Latypov
2022-02-24 22:54     ` Stephen Boyd
2022-02-24 22:54       ` Stephen Boyd
2022-02-24 23:21       ` Daniel Latypov
2022-02-24 23:21         ` Daniel Latypov
2022-03-25 21:19         ` Stephen Boyd
2022-03-25 21:19           ` Stephen Boyd
2022-03-25 22:44           ` Daniel Latypov
2022-03-25 22:44             ` Daniel Latypov
2022-02-25 14:26       ` Maxime Ripard
2022-02-25 14:26         ` Maxime Ripard
2022-02-25 22:44         ` Stephen Boyd
2022-02-25 22:44           ` Stephen Boyd
2022-02-28 11:10           ` Maxime Ripard
2022-02-28 11:10             ` Maxime Ripard
2022-02-25 13:22     ` Maxime Ripard
2022-02-25 13:22       ` Maxime Ripard
2022-02-25 21:29       ` Daniel Latypov
2022-02-25 21:29         ` Daniel Latypov
2022-02-28 10:47         ` Maxime Ripard
2022-02-28 10:47           ` Maxime Ripard
2022-03-25 22:36           ` Daniel Latypov
2022-03-25 22:36             ` Daniel Latypov
2022-03-28  7:57             ` Maxime Ripard
2022-03-28  7:57               ` Maxime Ripard
2022-03-28 19:36               ` Daniel Latypov
2022-03-28 19:36                 ` Daniel Latypov
2022-03-30  7:43                 ` Maxime Ripard
2022-03-30  7:43                   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 03/12] clk: Enforce that disjoints limits are invalid Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 04/12] clk: Always clamp the rounded rate Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 05/12] clk: Use clamp instead of open-coding our own Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-24 22:51   ` Stephen Boyd [this message]
2022-02-24 22:51     ` Stephen Boyd
2022-02-23 10:55 ` [PATCH v6 06/12] clk: Always set the rate on clk_set_range_rate Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 07/12] clk: Add clk_drop_range Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 08/12] clk: bcm: rpi: Add variant structure Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 09/12] clk: bcm: rpi: Set a default minimum rate Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 10/12] clk: bcm: rpi: Run some clocks at the minimum rate allowed Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:55 ` [PATCH v6 11/12] drm/vc4: Add logging and comments Maxime Ripard
2022-02-23 10:55   ` Maxime Ripard
2022-02-23 10:56 ` [PATCH v6 12/12] drm/vc4: hdmi: Remove clock rate initialization Maxime Ripard
2022-02-23 10:56   ` Maxime Ripard

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