[PATCH 1/1] thermal: imx8mm: enable ADC when enabling monitor

[Daniel Lezcano]

On 22/11/2021 12:42, Alexander Stein wrote:
> From: Paul Gerber <Paul.Gerber at tq-group.com>
> 
> The i.MX 8MP has a ADC_PD bit in the TMU_TER register that controls the
> operating mode of the ADC:
> * 0 means normal operating mode
> * 1 means power down mode
> 
> When enabling/disabling the TMU, the ADC operating mode must be set
> accordingly.
> 
> i.MX 8M Mini & Nano are lacking this bit.
> 
> Signed-off-by: Paul Gerber <Paul.Gerber at tq-group.com>
> Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
> ---
> Often this bit is set already by the bootloader, but in case this is not
> done, the file /sys/class/thermal/thermal_zone0/temp will always return
> -EAGAIN.

Does it deserve a Fixes tag?

>  drivers/thermal/imx8mm_thermal.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/thermal/imx8mm_thermal.c b/drivers/thermal/imx8mm_thermal.c
> index 7442e013738f..af666bd9e8d4 100644
> --- a/drivers/thermal/imx8mm_thermal.c
> +++ b/drivers/thermal/imx8mm_thermal.c
> @@ -21,6 +21,7 @@
>  #define TPS			0x4
>  #define TRITSR			0x20	/* TMU immediate temp */
>  
> +#define TER_ADC_PD		BIT(30)
>  #define TER_EN			BIT(31)
>  #define TRITSR_TEMP0_VAL_MASK	0xff
>  #define TRITSR_TEMP1_VAL_MASK	0xff0000
> @@ -113,6 +114,8 @@ static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
>  
>  	val = readl_relaxed(tmu->base + TER);
>  	val = enable ? (val | TER_EN) : (val & ~TER_EN);
> +	if (tmu->socdata->version == TMU_VER2)
> +		val = enable ? (val & ~TER_ADC_PD) : (val | TER_ADC_PD);
>  	writel_relaxed(val, tmu->base + TER);
>  }
>  
> 


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