linux-kernel - Re: [PATCH 08/25] thermal/drivers/hisi: Fix configuration register setting

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Message-ID: <20171017042204.GA6470@localhost.localdomain>
Date:   Mon, 16 Oct 2017 21:22:05 -0700
From:   Eduardo Valentin <edubezval@...il.com>
To:     Daniel Lezcano <daniel.lezcano@...aro.org>
Cc:     rui.zhang@...el.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, kevin.wangtao@...aro.org
Subject: Re: [PATCH 08/25] thermal/drivers/hisi: Fix configuration register
 setting

On Tue, Oct 10, 2017 at 08:02:33PM +0200, Daniel Lezcano wrote:
> The TEMP0_CFG configuration register contains different field to set up the
> temperature controller. However in the code, nothing prevents a setup to
> overwrite the previous one: eg. writing the hdak value overwrites the sensor
> selection, the sensor selection overwrites the hdak value.
> 
> In order to prevent such thing, use a regmap-like mechanism by reading the
> value before, set the corresponding bits and write the result.
> 
> Signed-off-by: Daniel Lezcano <daniel.lezcano@...aro.org>
> ---
>  drivers/thermal/hisi_thermal.c | 34 +++++++++++++++++++++++++++++-----
>  1 file changed, 29 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
> index 8e8a117..5688556 100644
> --- a/drivers/thermal/hisi_thermal.c
> +++ b/drivers/thermal/hisi_thermal.c
> @@ -30,6 +30,8 @@
>  #define TEMP0_TH			(0x4)
>  #define TEMP0_RST_TH			(0x8)
>  #define TEMP0_CFG			(0xC)
> +#define TEMP0_CFG_SS_MSK		(0xF000)
> +#define TEMP0_CFG_HDAK_MSK		(0x30)
>  #define TEMP0_EN			(0x10)
>  #define TEMP0_INT_EN			(0x14)
>  #define TEMP0_INT_CLR			(0x18)
> @@ -132,19 +134,41 @@ static inline void hisi_thermal_enable(void __iomem *addr, int value)
>  	writel(value, addr + TEMP0_EN);
>  }
>  
> -static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
> +static inline int hisi_thermal_get_temperature(void __iomem *addr)
>  {
> -	writel((sensor << 12), addr + TEMP0_CFG);
> +	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
>  }
>  
> -static inline int hisi_thermal_get_temperature(void __iomem *addr)
> +/*
> + * Temperature configuration register - Sensor selection
> + *
> + * Bits [19:12]
> + *
> + * 0x0: local sensor (default)
> + * 0x1: remote sensor 1 (ACPU cluster 1)
> + * 0x2: remote sensor 2 (ACPU cluster 0)
> + * 0x3: remote sensor 3 (G3D)
> + */
> +static inline void hisi_thermal_sensor_select(void __iomem *addr, int sensor)
>  {
> -	return hisi_thermal_step_to_temp(readl(addr + TEMP0_VALUE));
> +	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_SS_MSK ) |


ERROR: space prohibited before that close parenthesis ')'
#135: FILE: drivers/thermal/hisi_thermal.c:154:
+	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_SS_MSK ) |



> +	       (sensor << 12), addr + TEMP0_CFG);
>  }
>  
> +/*
> + * Temperature configuration register - Hdak conversion polling interval
> + *
> + * Bits [5:4]
> + *
> + * 0x0 :   0.768 ms
> + * 0x1 :   6.144 ms
> + * 0x2 :  49.152 ms
> + * 0x3 : 393.216 ms
> + */
>  static inline void hisi_thermal_hdak_set(void __iomem *addr, int value)
>  {
> -	writel(value, addr + TEMP0_CFG);
> +	writel((readl(addr + TEMP0_CFG) & ~TEMP0_CFG_HDAK_MSK) |
> +	       (value << 4), addr + TEMP0_CFG);
>  }
>  
>  static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
> -- 
> 2.7.4
>