linux-kernel - Re: [PATCH 2/4] soundwire: bus: add sdw_slave_get_current

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Message-ID: <68c06500-a776-4f56-8514-c180b23f7715@oss.qualcomm.com>
Date: Fri, 27 Jun 2025 17:54:31 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: srinivas.kandagatla@....qualcomm.com, vkoul@...nel.org, broonie@...nel.org
Cc: yung-chuan.liao@...ux.intel.com, pierre-louis.bossart@...ux.dev,
        lgirdwood@...il.com, perex@...ex.cz, tiwai@...e.com,
        krzysztof.kozlowski@...aro.org, linux-kernel@...r.kernel.org,
        linux-sound@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH 2/4] soundwire: bus: add sdw_slave_get_current_bank helper

On 6/27/25 5:51 PM, srinivas.kandagatla@....qualcomm.com wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
> 
> There has been 2 instances of this helper in codec drivers,
> it does not make sense to keep duplicating this part of code.
> 
> Lets add a helper sdw_get_current_bank() for codec drivers to use it.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@....qualcomm.com>
> ---
>  drivers/soundwire/bus.c       | 7 +++++++
>  include/linux/soundwire/sdw.h | 8 ++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
> index 39aecd34c641..58306c515ccc 100644
> --- a/drivers/soundwire/bus.c
> +++ b/drivers/soundwire/bus.c
> @@ -1363,6 +1363,13 @@ int sdw_slave_get_scale_index(struct sdw_slave *slave, u8 *base)
>  }
>  EXPORT_SYMBOL(sdw_slave_get_scale_index);
>  
> +int sdw_slave_get_current_bank(struct sdw_slave *sdev)
> +{
> +	return FIELD_GET(SDW_SCP_STAT_CURR_BANK,
> +			 sdw_read(sdev, SDW_SCP_CTRL));

sdw_read can fail (miserably)

Konrad