Re: [PATCH v2 05/10] media: adv748x: add support for HDMI audio

From: Alex Riesen <alexander.riesen@cetitec.com>
To: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Kieran Bingham <kieran.bingham@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Hans Verkuil <hverkuil-cisco@xs4all.nl>,
	"Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>,
	driverdevel <devel@driverdev.osuosl.org>,
	Linux Media Mailing List <linux-media@vger.kernel.org>,
	"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
	linux-clk <linux-clk@vger.kernel.org>
Subject: Re: [PATCH v2 05/10] media: adv748x: add support for HDMI audio
Date: Fri, 20 Mar 2020 11:58:46 +0100	[thread overview]
Message-ID: <20200320105846.GG4344@pflmari> (raw)
In-Reply-To: <CAMuHMdXOAQtuxCAfb=sZKodyJWwSrf-GO-pdV3HYkOytQW4ENg@mail.gmail.com>

Hi Geert,

Geert Uytterhoeven, Fri, Mar 20, 2020 09:43:29 +0100:
> CC linux-clk for the clock provider.
> 
> On Thu, Mar 19, 2020 at 6:42 PM Alex Riesen <alexander.riesen@cetitec.com> wrote:
> > This adds an implemention of SoC DAI driver which provides access to the
> > I2S port of the device.

I just noticed I don't do clk_prepare_enable anywhere.
Shouldn't the clock master enable its clocks somewhere?

> > diff --git a/drivers/media/i2c/adv748x/adv748x-dai.c b/drivers/media/i2c/adv748x/adv748x-dai.c
> > new file mode 100644
> > index 000000000000..4775a0c7ed7f
> > --- /dev/null
> > +++ b/drivers/media/i2c/adv748x/adv748x-dai.c
...
> > +static int adv748x_dai_startup(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
> > +{
> > +       struct adv748x_state *state = state_of(dai);
> > +
> > +       if (sub->stream != SNDRV_PCM_STREAM_CAPTURE)
> > +               return -EINVAL;
> > +       return set_audio_pads_state(state, 1);
> > +}

For example, here, after activation of the lines succeeded?

> > +static void adv748x_dai_shutdown(struct snd_pcm_substream *sub, struct snd_soc_dai *dai)
> > +{
> > +       struct adv748x_state *state = state_of(dai);
> > +
> > +       set_audio_pads_state(state, 0);
> > +}

And clk_disable_unprepare here, before shutting down the pads?

Regards,
Alex