linux-kernel - Re: [PATCH 04/16] soundwire: cadence: handle error cases with CONFIG

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Date:   Fri, 13 Mar 2020 12:09:11 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        tiwai@...e.de, broonie@...nel.org, gregkh@...uxfoundation.org,
        jank@...ence.com, srinivas.kandagatla@...aro.org,
        slawomir.blauciak@...el.com,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Hui Wang <hui.wang@...onical.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [PATCH 04/16] soundwire: cadence: handle error cases with
 CONFIG_UPDATE



On 3/13/20 7:08 AM, Vinod Koul wrote:
> On 11-03-20, 13:41, Pierre-Louis Bossart wrote:
>> config_update() may time out or cannot be use in ClockStopMode
>>
>> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
>> ---
>>   drivers/soundwire/cadence_master.c | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
>> index 71cba2585151..4089c271305a 100644
>> --- a/drivers/soundwire/cadence_master.c
>> +++ b/drivers/soundwire/cadence_master.c
>> @@ -239,6 +239,11 @@ static int cdns_config_update(struct sdw_cdns *cdns)
>>   {
>>   	int ret;
>>   
>> +	if (sdw_cdns_is_clock_stop(cdns)) {
>> +		dev_err(cdns->dev, "Cannot program MCP_CONFIG_UPDATE in ClockStopMode\n");
> 
> This looks fine but duplicates the log, so maybe you can remove from
> here or preceding patch... Or use single line as I suggested in that
> patch and keep this as is.

It doesn't duplicate it. In Patch1 it's a dev_dbg log that's useful for 
integration, and that function is used in other places (see the 
soundwire:intel series).

In this patch this is a clear error leading to a master hang.