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Message-ID: <ffb79f8b-7557-92eb-2c20-e8f5fd2afaee@linux.intel.com>
Date:   Fri, 16 Sep 2022 16:22:37 +0200
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Subject: Re: [PATCH v2 1/2] soundwire: qcom: update status from device id 1
Content-Language: en-US
To:     Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
        vkoul@kernel.org
Cc:     alsa-devel@alsa-project.org, linux-arm-msm@vger.kernel.org,
        linux-kernel@vger.kernel.org, sanyog.r.kale@intel.com,
        yung-chuan.liao@linux.intel.com, quic_srivasam@quicinc.com
References: <20220916135352.19114-1-srinivas.kandagatla@linaro.org>
From:   Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
In-Reply-To: <20220916135352.19114-1-srinivas.kandagatla@linaro.org>
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On 9/16/22 15:53, Srinivas Kandagatla wrote:
> By default autoenumeration is enabled on QCom SoundWire controller
> which means the core should not be dealing with device 0 w.r.t enumeration.
> 
> During Enumeration if SoundWire core sees status[0] as SDW_SLAVE_ATTACHED and
> start programming the device id, however reading DEVID registers return zeros
> which does not match to any of the slaves in the list and the core attempts
> to park this device to Group 13.  This results in adding SoundWire device
> with enumeration address 0:0:0:0
> 
> Fix this by not passing device 0 status to SoundWire core.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>

Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

> ---
> Changes since v1:
> 	- updated change log and split patch in to two as suggested by Pierre
> 
>  drivers/soundwire/qcom.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
> index e7f95c41eb70..d3ce580cdeaf 100644
> --- a/drivers/soundwire/qcom.c
> +++ b/drivers/soundwire/qcom.c
> @@ -448,7 +448,7 @@ static void qcom_swrm_get_device_status(struct qcom_swrm_ctrl *ctrl)
>  	ctrl->reg_read(ctrl, SWRM_MCP_SLV_STATUS, &val);
>  	ctrl->slave_status = val;
>  
> -	for (i = 0; i <= SDW_MAX_DEVICES; i++) {
> +	for (i = 1; i <= SDW_MAX_DEVICES; i++) {
>  		u32 s;
>  
>  		s = (val >> (i * 2));