linux-kernel - Re: [PATCH v5 4/7] drm/bridge: dw-hdmi: Add API dw_hdmi_set_sample

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Message-ID: <CAA+D8AOCTqb5jLeRapYk4wRGZrsrPiuAR=ow3OA1B0+M9X4k7w@mail.gmail.com>
Date: Wed, 3 Sep 2025 18:41:05 +0800
From: Shengjiu Wang <shengjiu.wang@...il.com>
To: Luca Ceresoli <luca.ceresoli@...tlin.com>
Cc: Shengjiu Wang <shengjiu.wang@....com>, andrzej.hajda@...el.com, 
	neil.armstrong@...aro.org, rfoss@...nel.org, 
	Laurent.pinchart@...asonboard.com, jonas@...boo.se, jernej.skrabec@...il.com, 
	maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de, 
	airlied@...il.com, simona@...ll.ch, lumag@...nel.org, dianders@...omium.org, 
	cristian.ciocaltea@...labora.com, dri-devel@...ts.freedesktop.org, 
	linux-kernel@...r.kernel.org, victor.liu@....com, shawnguo@...nel.org, 
	s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com, 
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, robh@...nel.org, 
	krzk+dt@...nel.org, conor+dt@...nel.org, p.zabel@...gutronix.de, 
	devicetree@...r.kernel.org, l.stach@...gutronix.de, perex@...ex.cz, 
	tiwai@...e.com, linux-sound@...r.kernel.org
Subject: Re: [PATCH v5 4/7] drm/bridge: dw-hdmi: Add API dw_hdmi_set_sample_iec958()
 for iec958 format

On Tue, Sep 2, 2025 at 12:52 AM Luca Ceresoli <luca.ceresoli@...tlin.com> wrote:
>
> Hello Shengjiu,
>
> On Thu, 21 Aug 2025 15:31:28 +0800
> Shengjiu Wang <shengjiu.wang@....com> wrote:
>
> > Add API dw_hdmi_set_sample_iec958() for IEC958 format because audio device
> > driver needs IEC958 information to configure this specific setting.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> > Acked-by: Liu Ying <victor.liu@....com>
>
> [...]
>
> > +void dw_hdmi_set_sample_iec958(struct dw_hdmi *hdmi, unsigned int iec958)
> > +{
> > +     mutex_lock(&hdmi->audio_mutex);
> > +     hdmi->sample_iec958 = iec958;
> > +     mutex_unlock(&hdmi->audio_mutex);
> > +}
>
> Apologies for jumping in the discussion as late as in v5, but I noticed
> this patch and I was wondering whether this mutex_lock/unlock() is
> really needed, as you're copying an int.

Thanks for your comments.

Seems it is not necessary to add mutex here. I just follow the code as
other similar functions.  I will send a new version to update it.

Best regards
Shengjiu Wang

Shengjiu Wang
>
> Luca
>
> --
> Luca Ceresoli, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com