linux-kernel - Re: [PATCH 16/18] thermal: exynos: cleanup code for enabling threshold interrupts

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Message-ID: <20180501110239.GM27619@mai>
Date:   Tue, 1 May 2018 13:02:39 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Cc:     Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 16/18] thermal: exynos: cleanup code for enabling
 threshold interrupts

On Thu, Apr 26, 2018 at 01:51:31PM +0200, Bartlomiej Zolnierkiewicz wrote:
> Cleanup code for enabling threshold interrupts in ->tmu_control
> method implementations.
> 
> There should be no functional changes caused by this patch.
> 
> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> ---
>  drivers/thermal/samsung/exynos_tmu.c | 101 ++++++++++++-----------------------
>  1 file changed, 34 insertions(+), 67 deletions(-)
> 
> diff --git a/drivers/thermal/samsung/exynos_tmu.c b/drivers/thermal/samsung/exynos_tmu.c
> index abe0737..9639acf 100644
> --- a/drivers/thermal/samsung/exynos_tmu.c
> +++ b/drivers/thermal/samsung/exynos_tmu.c
> @@ -76,9 +76,6 @@
>  #define EXYNOS_TMU_THERM_TRIP_EN_SHIFT	12
>  
>  #define EXYNOS_TMU_INTEN_RISE0_SHIFT	0
> -#define EXYNOS_TMU_INTEN_RISE1_SHIFT	4
> -#define EXYNOS_TMU_INTEN_RISE2_SHIFT	8
> -#define EXYNOS_TMU_INTEN_RISE3_SHIFT	12
>  #define EXYNOS_TMU_INTEN_FALL0_SHIFT	16
>  
>  #define EXYNOS_EMUL_TIME	0x57F0
> @@ -136,13 +133,6 @@
>  #define EXYNOS7_TMU_TEMP_MASK			0x1ff
>  #define EXYNOS7_PD_DET_EN_SHIFT			23
>  #define EXYNOS7_TMU_INTEN_RISE0_SHIFT		0
> -#define EXYNOS7_TMU_INTEN_RISE1_SHIFT		1
> -#define EXYNOS7_TMU_INTEN_RISE2_SHIFT		2
> -#define EXYNOS7_TMU_INTEN_RISE3_SHIFT		3
> -#define EXYNOS7_TMU_INTEN_RISE4_SHIFT		4
> -#define EXYNOS7_TMU_INTEN_RISE5_SHIFT		5
> -#define EXYNOS7_TMU_INTEN_RISE6_SHIFT		6
> -#define EXYNOS7_TMU_INTEN_RISE7_SHIFT		7
>  #define EXYNOS7_EMUL_DATA_SHIFT			7
>  #define EXYNOS7_EMUL_DATA_MASK			0x1ff
>  
> @@ -615,29 +605,27 @@ static void exynos4210_tmu_control(struct platform_device *pdev, bool on)
>  {
>  	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
>  	struct thermal_zone_device *tz = data->tzd;
> -	unsigned int con, interrupt_en;
> +	unsigned int con, interrupt_en = 0, i;
>  
>  	con = get_con_reg(data, readl(data->base + EXYNOS_TMU_REG_CONTROL));
>  
>  	if (on) {
> -		con |= (1 << EXYNOS_TMU_CORE_EN_SHIFT);
> -		interrupt_en =
> -			(of_thermal_is_trip_valid(tz, 3)
> -			 << EXYNOS_TMU_INTEN_RISE3_SHIFT) |
> -			(of_thermal_is_trip_valid(tz, 2)
> -			 << EXYNOS_TMU_INTEN_RISE2_SHIFT) |
> -			(of_thermal_is_trip_valid(tz, 1)
> -			 << EXYNOS_TMU_INTEN_RISE1_SHIFT) |
> -			(of_thermal_is_trip_valid(tz, 0)
> -			 << EXYNOS_TMU_INTEN_RISE0_SHIFT);
> +		for (i = 0; i < data->ntrip; i++) {
> +			if (!of_thermal_is_trip_valid(tz, i))
> +				continue;
> +
> +			interrupt_en |=
> +				(1 << (EXYNOS_TMU_INTEN_RISE0_SHIFT + i * 4));
> +		}

As EXYNOS_TMU_INTEN_RISE0_SHIFT is equal to zero, may be you can replace this
by BITS(i * 4) ?

Same comments for exynos5433 and exynos7 below.

I don't know which one was intended : 
 ((EXYNOS_TMU_INTEN_RISE0_SHIFT + i) * 4) or
  (EXYNOS_TMU_INTEN_RISE0_SHIFT + (i * 4))

but if it is the former it is lucky it works because the macro is zero.

Is it possible to have the registers layout, that would facilitate the review.


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