Re: [PATCH v6 3/6] mfd: ti_am335x_tscadc: Remove unwanted reg_se_cache save

[Lee Jones]

On Wed, 07 Jan 2015, Vignesh R wrote:

> In one shot mode, sequencer automatically disables all enabled steps at
> the end of each cycle. (both ADC steps and TSC steps) Hence these steps
> need not be saved in reg_se_cache for clearing these steps at a later
> stage.
> Also, when ADC wakes up Sequencer should not be busy executing any of the
> config steps except for the charge step. Previously charge step was 1 ADC
> clock cycle and hence it was ignored.
> TSC steps are always disabled at the end of each conversion cycle, hence
> there is no need to explicitly disable TSC steps by writing 0 to REG_SE.
> 
> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
> ---
> 
> v5:
>  - Remove unnecessary clearing of REG_SE
> 
>  drivers/mfd/ti_am335x_tscadc.c       | 13 +++++--------
>  include/linux/mfd/ti_am335x_tscadc.h |  1 +
>  2 files changed, 6 insertions(+), 8 deletions(-)

Looks fine.

For my own reference:
  Acked-by: Lee Jones <lee.jones@xxxxxxxxxx>

Can this patch be applied on its own?

> diff --git a/drivers/mfd/ti_am335x_tscadc.c b/drivers/mfd/ti_am335x_tscadc.c
> index 467c80e1c4ae..e4e4b22eebc9 100644
> --- a/drivers/mfd/ti_am335x_tscadc.c
> +++ b/drivers/mfd/ti_am335x_tscadc.c
> @@ -68,12 +68,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc)
>  	DEFINE_WAIT(wait);
>  	u32 reg;
>  
> -	/*
> -	 * disable TSC steps so it does not run while the ADC is using it. If
> -	 * write 0 while it is running (it just started or was already running)
> -	 * then it completes all steps that were enabled and stops then.
> -	 */
> -	tscadc_writel(tsadc, REG_SE, 0);
>  	reg = tscadc_readl(tsadc, REG_ADCFSM);
>  	if (reg & SEQ_STATUS) {
>  		tsadc->adc_waiting = true;
> @@ -86,8 +80,12 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc)
>  		spin_lock_irq(&tsadc->reg_lock);
>  		finish_wait(&tsadc->reg_se_wait, &wait);
>  
> +		/*
> +		 * Sequencer should either be idle or
> +		 * busy applying the charge step.
> +		 */
>  		reg = tscadc_readl(tsadc, REG_ADCFSM);
> -		WARN_ON(reg & SEQ_STATUS);
> +		WARN_ON((reg & SEQ_STATUS) && !(reg & CHARGE_STEP));
>  		tsadc->adc_waiting = false;
>  	}
>  	tsadc->adc_in_use = true;
> @@ -96,7 +94,6 @@ static void am335x_tscadc_need_adc(struct ti_tscadc_dev *tsadc)
>  void am335x_tsc_se_set_once(struct ti_tscadc_dev *tsadc, u32 val)
>  {
>  	spin_lock_irq(&tsadc->reg_lock);
> -	tsadc->reg_se_cache |= val;
>  	am335x_tscadc_need_adc(tsadc);
>  
>  	tscadc_writel(tsadc, REG_SE, val);
> diff --git a/include/linux/mfd/ti_am335x_tscadc.h b/include/linux/mfd/ti_am335x_tscadc.h
> index 3f4e994ace2b..1fd50dcfe47c 100644
> --- a/include/linux/mfd/ti_am335x_tscadc.h
> +++ b/include/linux/mfd/ti_am335x_tscadc.h
> @@ -128,6 +128,7 @@
>  
>  /* Sequencer Status */
>  #define SEQ_STATUS BIT(5)
> +#define CHARGE_STEP		0x11
>  
>  #define ADC_CLK			3000000
>  #define TOTAL_STEPS		16

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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