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

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Message-ID: <20250901185208.394cd162@booty>
Date: Mon, 1 Sep 2025 18:52:08 +0200
From: Luca Ceresoli <luca.ceresoli@...tlin.com>
To: Shengjiu Wang <shengjiu.wang@....com>
Cc: andrzej.hajda@...el.com, neil.armstrong@...aro.org, rfoss@...nel.org,
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Subject: Re: [PATCH v5 4/7] drm/bridge: dw-hdmi: Add API
 dw_hdmi_set_sample_iec958() for iec958 format

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.

Luca

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