linux-kernel - Re: [alsa-devel] [PATCH 4/6] soundwire: stream: do not update parameters during DISABLED-PREPARED transition

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Date:   Fri, 10 Jan 2020 10:11:46 -0600
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [PATCH 4/6] soundwire: stream: do not update
 parameters during DISABLED-PREPARED transition


>> +	/*
>> +	 * when the stream is DISABLED, this means sdw_prepare_stream()
>> +	 * is called as a result of an underflow or a resume operation.
>> +	 * In this case, the bus parameters shall not be recomputed, but
>> +	 * still need to be re-applied
>> +	 */
>> +	if (stream->state == SDW_STREAM_DISABLED)
>> +		update_params = false;
> 
> Should this not be handled by the caller..? I do not like to deduce this
> here as the info is already available in dai driver, so go ahead and
> propagate it and get it from caller when it is required..

No, this update_params boolean is used later on to modify the bandwidth 
computation. These values are not accessible to the caller (and should 
absolutely be kept private/opaque).