linux-kernel - Re: [PATCH v2 08/12] drm: bridge/dw_hdmi: add audio config interfaces

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Date:	Sat, 31 Jan 2015 09:34:23 -0500
From:	Yang Kuankuan <ykk@...k-chips.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	David Airlie <airlied@...ux.ie>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Rob Clark <robdclark@...il.com>,
	Mark Yao <mark.yao@...k-chips.com>,
	Daniel Vetter <daniel@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	djkurtz@...omium.org, dbehr@...omoum.org, mmind00@...glemail.com,
	dianders@...omium.org, marcheu@...omium.org,
	rockchip-discuss@...omium.org
Subject: Re: [PATCH v2 08/12] drm: bridge/dw_hdmi: add audio config interfaces


On 01/31/2015 06:48 AM, Russell King - ARM Linux wrote:
> On Fri, Jan 30, 2015 at 06:32:23AM -0500, Yakir Yang wrote:
>> +static void hdmi_config_audio(struct dw_hdmi *hdmi,
>> +			      struct hdmi_audio_fmt *aud_fmt)
>> +{
>> +	if (aud_fmt)
>> +		hdmi->aud_fmt = *aud_fmt;
>> +
>> +	hdmi_modb(hdmi, AUDIO_CONF0_INTERFACE_II2S,
>> +		  AUDIO_CONF0_INTERFACE_MSK, HDMI_AUD_CONF0);
>> +
>> +	hdmi_modb(hdmi, hdmi->aud_fmt.chan_num, AUDIO_CONF0_I2SINEN_MSK,
>> +		  HDMI_AUD_CONF0);
>> +
>> +	hdmi_modb(hdmi, hdmi->aud_fmt.word_length, AUDIO_CONF1_DATWIDTH_MSK,
>> +		  HDMI_AUD_CONF1);
>> +
>> +	hdmi_modb(hdmi, hdmi->aud_fmt.dai_fmt, AUDIO_CONF1_DATAMODE_MSK,
>> +		  HDMI_AUD_CONF1);
> These registers are not defined on iMX6 SoCs, so this probably needs to be
> conditionalised with the dw-hdmi IP version.
okay, i will fixed what you have suggest in cover-letter first.

Thanks. : )
>> +void hdmi_audio_clk_enable(struct dw_hdmi *hdmi)
>> +{
>> +	if (hdmi->audio_enable)
>> +		return;
>> +
>> +	mutex_lock(&hdmi->audio_mutex);
>> +	hdmi->audio_enable = true;
>> +	hdmi_modb(hdmi, 0, HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS);
>> +	mutex_unlock(&hdmi->audio_mutex);
> This is racy.  The test needs to be within the mutex-protected region.
This function will be called by other driver (dw-hdmi-audio), both 
modify the variable "hdmi->audio_enable", so i add the mutex-protected.
>
>> +}
>> +
>> +void hdmi_audio_clk_disable(struct dw_hdmi *hdmi)
>> +{
>> +	if (!hdmi->audio_enable)
>> +		return;
>> +
>> +	mutex_lock(&hdmi->audio_mutex);
>> +	hdmi_modb(hdmi, HDMI_MC_CLKDIS_AUDCLK_DISABLE,
>> +		  HDMI_MC_CLKDIS_AUDCLK_DISABLE, HDMI_MC_CLKDIS);
>> +	hdmi->audio_enable = false;
>> +	mutex_unlock(&hdmi->audio_mutex);
> Ditto.
>


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