Re: [PATCH 1/3 v4 RESEND] mfd: arizona: Export function to control subsystem DVFS

[Lee Jones <lee.jones@linaro.org>]

On Fri, 08 Aug 2014, Richard Fitzgerald wrote:

> From: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
> 
> Moving this control from being a side-effect of the LDO1
> regulator driver to a specific exported function.
> 
> Signed-off-by: Richard Fitzgerald <rf@opensource.wolfsonmicro.com>
> Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
> ---
>  drivers/mfd/arizona-core.c       |   89 ++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/arizona/core.h |   12 +++++
>  2 files changed, 101 insertions(+), 0 deletions(-)

If this is the same patch I reviewed before:

  Acked-by: Lee Jones <lee.jones@linaro.org>

I guess we're just waiting for maintainer Acks before I can apply the
set.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index cfc191a..04cde4b 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -94,6 +94,94 @@ int arizona_clk32k_disable(struct arizona *arizona)
>  }
>  EXPORT_SYMBOL_GPL(arizona_clk32k_disable);
>  
> +int arizona_dvfs_up(struct arizona *arizona, unsigned int flags)
> +{
> +	unsigned int new_flags;
> +	int ret = 0;
> +
> +	mutex_lock(&arizona->subsys_max_lock);
> +
> +	new_flags = arizona->subsys_max_rq | flags;
> +
> +	if (arizona->subsys_max_rq != new_flags) {
> +		switch (arizona->type) {
> +		case WM5102:
> +		case WM8997:
> +			ret = regulator_set_voltage(arizona->dcvdd,
> +						    1800000, 1800000);
> +			if (ret != 0) {
> +				dev_err(arizona->dev,
> +					"Failed to set DCVDD (DVFS up): %d\n",
> +					ret);
> +				goto err;
> +			}
> +
> +			ret = regmap_update_bits(arizona->regmap,
> +					ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
> +					ARIZONA_SUBSYS_MAX_FREQ, 1);
> +			if (ret != 0) {
> +				dev_err(arizona->dev,
> +					"Failed to enable subsys max: %d\n",
> +					ret);
> +				regulator_set_voltage(arizona->dcvdd,
> +						      1200000, 1800000);
> +				goto err;
> +			}
> +			break;
> +
> +		default:
> +			break;
> +		}
> +
> +		arizona->subsys_max_rq = new_flags;
> +	}
> +err:
> +	mutex_unlock(&arizona->subsys_max_lock);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(arizona_dvfs_up);
> +
> +int arizona_dvfs_down(struct arizona *arizona, unsigned int flags)
> +{
> +	int ret = 0;
> +
> +	mutex_lock(&arizona->subsys_max_lock);
> +
> +	if ((arizona->subsys_max_rq & flags) != flags)
> +		dev_warn(arizona->dev, "Unbalanced DVFS down: %x\n", flags);
> +
> +	arizona->subsys_max_rq &= ~flags;
> +
> +	if (arizona->subsys_max_rq == 0) {
> +		switch (arizona->type) {
> +		case WM5102:
> +		case WM8997:
> +			ret = regmap_update_bits(arizona->regmap,
> +					ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
> +					ARIZONA_SUBSYS_MAX_FREQ, 0);
> +			if (ret != 0)
> +				dev_err(arizona->dev,
> +					"Failed to disable subsys max: %d\n",
> +					ret);
> +
> +			ret = regulator_set_voltage(arizona->dcvdd,
> +						    1200000, 1800000);
> +			if (ret != 0)
> +				dev_err(arizona->dev,
> +					"Failed to set DCVDD (DVFS down): %d\n",
> +					ret);
> +			break;
> +
> +		default:
> +			break;
> +		}
> +	}
> +
> +	mutex_unlock(&arizona->subsys_max_lock);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(arizona_dvfs_down);
> +
>  static irqreturn_t arizona_clkgen_err(int irq, void *data)
>  {
>  	struct arizona *arizona = data;
> @@ -641,6 +729,7 @@ int arizona_dev_init(struct arizona *arizona)
>  
>  	dev_set_drvdata(arizona->dev, arizona);
>  	mutex_init(&arizona->clk_lock);
> +	mutex_init(&arizona->subsys_max_lock);
>  
>  	if (dev_get_platdata(arizona->dev))
>  		memcpy(&arizona->pdata, dev_get_platdata(arizona->dev),
> diff --git a/include/linux/mfd/arizona/core.h b/include/linux/mfd/arizona/core.h
> index a614b33..4aec6a3 100644
> --- a/include/linux/mfd/arizona/core.h
> +++ b/include/linux/mfd/arizona/core.h
> @@ -109,6 +109,9 @@ struct arizona {
>  	struct mutex clk_lock;
>  	int clk32k_ref;
>  
> +	struct mutex subsys_max_lock;
> +	unsigned int subsys_max_rq;
> +
>  	struct snd_soc_dapm_context *dapm;
>  
>  	int tdm_width[ARIZONA_MAX_AIF];
> @@ -118,8 +121,17 @@ struct arizona {
>  	uint8_t dac_comp_enabled;
>  };
>  
> +#define ARIZONA_DVFS_SR1_RQ          0x00000001
> +#define ARIZONA_DVFS_SR2_RQ          0x00000002
> +#define ARIZONA_DVFS_SR3_RQ          0x00000004
> +#define ARIZONA_DVFS_ASR1_RQ         0x00000010
> +#define ARIZONA_DVFS_ASR2_RQ         0x00000020
> +#define ARIZONA_DVFS_ADSP1_RQ        0x00010000
> +
>  int arizona_clk32k_enable(struct arizona *arizona);
>  int arizona_clk32k_disable(struct arizona *arizona);
> +int arizona_dvfs_up(struct arizona *arizona, unsigned int mask);
> +int arizona_dvfs_down(struct arizona *arizona, unsigned int mask);
>  
>  int arizona_request_irq(struct arizona *arizona, int irq, char *name,
>  			irq_handler_t handler, void *data);

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