linux-kernel - Re: [PATCH v11 5/9] drivers: thermal: tsens: Fix bug in sensor enable for msm8960

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Date:   Mon, 22 Mar 2021 11:47:29 +0100
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Ansuel Smith <ansuelsmth@...il.com>,
        Thara Gopinath <thara.gopinath@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Amit Kucheria <amitk@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11 5/9] drivers: thermal: tsens: Fix bug in sensor enable
 for msm8960

On 19/03/2021 01:52, Ansuel Smith wrote:

> Device based on tsens VER_0 contains a hardware bug that results in some
> problem with sensor enablement. Sensor id 6-11 can't be enabled
> selectively and all of them must be enabled in one step.
> 
> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/thermal/qcom/tsens-8960.c | 24 +++++++++++++++++++++---
>  1 file changed, 21 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/thermal/qcom/tsens-8960.c b/drivers/thermal/qcom/tsens-8960.c
> index 86585f439985..bdc64d4188bf 100644
> --- a/drivers/thermal/qcom/tsens-8960.c
> +++ b/drivers/thermal/qcom/tsens-8960.c
> @@ -27,9 +27,9 @@
>  #define EN			BIT(0)
>  #define SW_RST			BIT(1)
>  #define SENSOR0_EN		BIT(3)
> +#define MEASURE_PERIOD		BIT(18)
>  #define SLP_CLK_ENA		BIT(26)
>  #define SLP_CLK_ENA_8660	BIT(24)
> -#define MEASURE_PERIOD		1
>  #define SENSOR0_SHIFT		3
>  
>  /* INT_STATUS_ADDR bitmasks */
> @@ -126,17 +126,35 @@ static int resume_8960(struct tsens_priv *priv)
>  static int enable_8960(struct tsens_priv *priv, int id)
>  {
>  	int ret;
> -	u32 reg, mask;
> +	u32 reg, mask = BIT(id);
>  
>  	ret = regmap_read(priv->tm_map, CNTL_ADDR, &reg);
>  	if (ret)
>  		return ret;
>  
> -	mask = BIT(id + SENSOR0_SHIFT);
> +	/* HARDWARE BUG:
> +	 * On platform with more than 6 sensors, all the remaining
> +	 * sensors needs to be enabled all togheder or underfined

s/On platform/On platforms
s/sensors needs/sensors need
s/togheder/together
s/underfined/undefined

Suggested fix up:

On platforms with more than 6 sensors, all remaining sensors
must be enabled together, otherwise undefined results are expected.

Regards.