linux-kernel - Re: [RESEND PATCH v3 06/10] mfd: wm5110: Add register patch required for low power sleep

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Message-ID: <20150513122128.GR3394@x1>
Date:	Wed, 13 May 2015 13:21:28 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:	broonie@...nel.org, lgirdwood@...il.com, sameo@...ux.intel.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH v3 06/10] mfd: wm5110: Add register patch required
 for low power sleep

On Mon, 11 May 2015, Charles Keepax wrote:

> Some register settings must be applied before the first time low power
> sleep mode is entered on the wm5110 to ensure optimium performance.
> These settings require SYSCLK to be enabled whilst they are being
> applied. This patch applies the settings using the recently factored out
> boot time SYSCLK functionality.
> 
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/arizona-core.c |   39 +++++++++++++++++++++++++++++++++++++++
>  1 files changed, 39 insertions(+), 0 deletions(-)

Applied, thanks.

> diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
> index b5a7e0e..c80ab79 100644
> --- a/drivers/mfd/arizona-core.c
> +++ b/drivers/mfd/arizona-core.c
> @@ -378,6 +378,35 @@ err:
>  	return ret ?: err;
>  }
>  
> +/*
> + * Register patch to some of the CODECs internal write sequences
> + * to ensure a clean exit from the low power sleep state.
> + */
> +static const struct reg_default wm5110_sleep_patch[] = {
> +	{ 0x337A, 0xC100 },
> +	{ 0x337B, 0x0041 },
> +	{ 0x3300, 0xA210 },
> +	{ 0x3301, 0x050C },
> +};
> +
> +static int wm5110_apply_sleep_patch(struct arizona *arizona)
> +{
> +	struct arizona_sysclk_state state;
> +	int err, ret;
> +
> +	ret = arizona_enable_freerun_sysclk(arizona, &state);
> +	if (ret)
> +		return ret;
> +
> +	ret = regmap_multi_reg_write_bypassed(arizona->regmap,
> +					      wm5110_sleep_patch,
> +					      ARRAY_SIZE(wm5110_sleep_patch));
> +
> +	err = arizona_disable_freerun_sysclk(arizona, &state);
> +
> +	return ret ?: err;
> +}
> +
>  static int wm5102_clear_write_sequencer(struct arizona *arizona)
>  {
>  	int ret;
> @@ -966,6 +995,16 @@ int arizona_dev_init(struct arizona *arizona)
>  				goto err_reset;
>  			}
>  			break;
> +		case WM5110:
> +		case WM8280:
> +			ret = wm5110_apply_sleep_patch(arizona);
> +			if (ret) {
> +				dev_err(arizona->dev,
> +					"Failed to apply sleep patch: %d\n",
> +					ret);
> +				goto err_reset;
> +			}
> +			break;
>  		default:
>  			break;
>  		}

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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