linux-kernel - Re: [alsa-devel] [RFC PATCH 4/5] ASoC: SOF: Intel: hda: add SoundWire stream config/free callbacks

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Message-ID: <20190904165522.GC2672@vkoul-mobl>
Date:   Wed, 4 Sep 2019 22:25:22 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc:     Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        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>,
        Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Zhu Yingjiang <yingjiang.zhu@...ux.intel.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Arnd Bergmann <arnd@...db.de>
Subject: Re: [alsa-devel] [RFC PATCH 4/5] ASoC: SOF: Intel: hda: add
 SoundWire stream config/free callbacks

On 04-09-19, 08:31, Pierre-Louis Bossart wrote:
> On 9/4/19 2:35 AM, Vinod Koul wrote:
> > On 22-08-19, 08:53, Pierre-Louis Bossart wrote:
> > > Thanks for the review Guennadi
> > > 
> > > > > +static int sdw_config_stream(void *arg, void *s, void *dai,
> > > > > +			     void *params, int link_id, int alh_stream_id)
> > > > 
> > > > I realise, that these function prototypes aren't being introduced by these
> > > > patches, but just wondering whether such overly generic prototype is really
> > > > a good idea here, whether some of those "void *" pointers could be given
> > > > real types. The first one could be "struct device *" etc.
> > > 
> > > In this case the 'arg' parameter is actually a private 'struct snd_sof_dev',
> > > as shown below [1]. We probably want to keep this relatively opaque, this is
> > > a context that doesn't need to be exposed to the SoundWire code.
> > 
> > This does look bit ugly.
> > 
> > > The dai and params are indeed cases where we could use stronger types, they
> > > are snd_soc_dai and hw_params respectively. I don't recall why the existing
> > > code is this way, Vinod and Sanyog may have the history of this.
> > 
> > Yes we wanted to decouple the sdw and audio bits that is the reason why
> > none of the audio types are used here, but I think it should be revisited
> > and perhaps made as:
> > 
> > sdw_config_stream(struct device *sdw, struct sdw_callback_ctx *ctx)
> > 
> > where the callback context contains all the other args. That would make
> > it look lot neater too and of course use real structs if possible
> 
> the suggested sdw_callbback_ctx is really intel-specific at the moment, e.g.
> the notion of link_id and alh_stream_id are due to the hardware, it's not
> generic at all. And in the latest code we also pass the dai->id.

s/sdw_callback_ctx/intel_sdw_callback_ctx

Yes this code is intel specific and this would be intel specific too

-- 
~Vinod