linux-kernel - Re: [PATCH] soundwire: stream: only change state if needed

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Date:   Tue, 17 Mar 2020 12:43:10 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org
Cc:     linux-kernel@...r.kernel.org, tiwai@...e.de, broonie@...nel.org,
        vkoul@...nel.org, gregkh@...uxfoundation.org, jank@...ence.com,
        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] soundwire: stream: only change state if needed



On 17/03/2020 12:22, Pierre-Louis Bossart wrote:
> Hi Srinivas,
> 
>> This patch did not work for me as it is as wsa881x codec does prepare 
>> and enable in one function, which breaks some of the assumptions in 
>> this patch.
> 
> Ah yes, if two transitions happen in the same DAI callback that wouldn't 
> work indeed. We should probably add this restriction to the state 
> machine documentation, the suggested mapping from ASoC DAI states to 
> stream states did not account for compound cases.
> 
>> However with below change I could get it working without moving stream 
>> handling to machine driver.
> 
> The change below would be an error case for Intel, so it's probably 
> better if we go with your suggestion. You have a very specific state 
> handling due to your power amps and it's probably better to keep it 
> platform-specific.
> 
> Can you confirm though that this patch works fine if you move all the 
> stream transitions to the machine driver? That should be a no-op but 
> better make sure there's no misunderstanding.

yes, it works with this patch + moving wsa stream handing to machine driver.

--srini
> 
> Thanks
> -Pierre