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Re: [PATCH 08/13] thermal/drivers/hisi: Fix configuration register setting

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On 02/09/2017 04:54, Leo Yan wrote:
> On Wed, Aug 30, 2017 at 10:47:32AM +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@linaro.org>
>> ---
>>  drivers/thermal/hisi_thermal.c | 30 +++++++++++++++++++++++++-----
>>  1 file changed, 25 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/thermal/hisi_thermal.c b/drivers/thermal/hisi_thermal.c
>> index d77a938..3e03908 100644
>> --- a/drivers/thermal/hisi_thermal.c
>> +++ b/drivers/thermal/hisi_thermal.c
>> @@ -132,19 +132,39 @@ 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) | (sensor << 12), addr + TEMP0_CFG);
> 
> nitpick: maybe it's better to firstly clear related bits and then set
> value?

Sorry, I don't get the comment. Can you elaborate ?


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[PATCH 01/13] thermal/drivers/hisi: Fix missing interrupt enablement Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 10:50 +0200
  [PATCH 02/13] thermal/drivers/hisi: Remove the multiple sensors support Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 10:50 +0200
    Re: [PATCH 02/13] thermal/drivers/hisi: Remove the multiple sensors  support Leo Yan <leo.yan@linaro.org> - 2017-09-01 16:10 +0200
      Re: [PATCH 02/13] thermal/drivers/hisi: Remove the multiple sensors  support Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-09-01 22:50 +0200
  [PATCH 06/13] thermal/drivers/hisi: Remove pointless lock Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 11:00 +0200
    Re: [PATCH 06/13] thermal/drivers/hisi: Remove pointless lock Leo Yan <leo.yan@linaro.org> - 2017-09-01 16:50 +0200
  [PATCH 03/13] thermal/drivers/hisi: Fix kernel panic on alarm interrupt Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 11:00 +0200
    Re: [PATCH 03/13] thermal/drivers/hisi: Fix kernel panic on alarm  interrupt Leo Yan <leo.yan@linaro.org> - 2017-09-01 16:20 +0200
  [PATCH 08/13] thermal/drivers/hisi: Fix configuration register setting Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 11:00 +0200
    Re: [PATCH 08/13] thermal/drivers/hisi: Fix configuration register  setting Leo Yan <leo.yan@linaro.org> - 2017-09-02 05:00 +0200
      Re: [PATCH 08/13] thermal/drivers/hisi: Fix configuration register  setting Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-09-02 10:40 +0200
        Re: [PATCH 08/13] thermal/drivers/hisi: Fix configuration register  setting Leo Yan <leo.yan@linaro.org> - 2017-09-04 03:00 +0200
          Re: [PATCH 08/13] thermal/drivers/hisi: Fix configuration register  setting Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-09-04 11:20 +0200
  [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor inspection Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 11:00 +0200
    Re: [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor  inspection Leo Yan <leo.yan@linaro.org> - 2017-09-02 05:30 +0200
      Re: [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor  inspection Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-09-02 15:20 +0200
        Re: [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor  inspection Leo Yan <leo.yan@linaro.org> - 2017-09-04 03:00 +0200
          Re: [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor  inspection Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-09-04 13:30 +0200
            Re: [PATCH 09/13] thermal/drivers/hisi: Remove costly sensor  inspection Leo Yan <leo.yan@linaro.org> - 2017-09-04 16:40 +0200
  [PATCH 05/13] thermal/drivers/hisi: Fix multiple alarm interrupts firing Daniel Lezcano <daniel.lezcano@linaro.org> - 2017-08-30 11:00 +0200
    Re: [PATCH 05/13] thermal/drivers/hisi: Fix multiple alarm  interrupts firing Leo Yan <leo.yan@linaro.org> - 2017-09-01 16:50 +0200
  Re: [PATCH 01/13] thermal/drivers/hisi: Fix missing interrupt  enablement Leo Yan <leo.yan@linaro.org> - 2017-09-01 10:40 +0200

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