linux-kernel - Re: [PATCH v2 2/2] drm: sun4i: hdmi: Add support for sun4i HDMI encoder audio

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Date:   Tue, 21 Jan 2020 18:32:47 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Maxime Ripard <mripard@...nel.org>
Cc:     Stefan Mavrodiev <stefan@...mex.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vkoul@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>,
        "moderated list:ARM/Allwinner sunXi SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:DRM DRIVERS FOR ALLWINNER A10" 
        <dri-devel@...ts.freedesktop.org>, linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 2/2] drm: sun4i: hdmi: Add support for sun4i HDMI
 encoder audio

On Tue, Jan 21, 2020 at 07:29:37PM +0100, Maxime Ripard wrote:

> > Mark, our issue here is that we have a driver tied to a device that is
> > an HDMI encoder. Obviously, we'll want to register into DRM, which is
> > what we were doing so far, with the usual case where at remove /
> > unbind time, in order to free the resources, we just retrieve our
> > pointer to our private structure using the device's drvdata.

> > Now, snd_soc_register_card also sets that pointer to the card we try
> > to register, which is problematic. It seems that it's used to handle
> > suspend / resume automatically, which in this case would be also not
> > really fit for us (or rather, we would need to do more that just
> > suspend the audio part).

There's a drvdata field in the snd_soc_card for cases like this - would
that work for you?

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