linux-kernel - Re: [PATCH v2] drm: dw-hdmi-i2s: enable audio clock in audio

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Date:   Mon, 2 Sep 2019 10:32:37 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Neil Armstrong <narmstrong@...libre.com>,
        Cheng-Yi Chiang <cychiang@...omium.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "tzungbi@...omium.org" <tzungbi@...omium.org>,
        "zhengxing@...k-chips.com" <zhengxing@...k-chips.com>,
        "kuninori.morimoto.gx@...esas.com" <kuninori.morimoto.gx@...esas.com>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "jeffy.chen@...k-chips.com" <jeffy.chen@...k-chips.com>,
        "dianders@...omium.org" <dianders@...omium.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "cain.cai@...k-chips.com" <cain.cai@...k-chips.com>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "eddie.cai@...k-chips.com" <eddie.cai@...k-chips.com>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "dgreid@...omium.org" <dgreid@...omium.org>,
        "sam@...nborg.org" <sam@...nborg.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2] drm: dw-hdmi-i2s: enable audio clock in audio_startup

On 2019-09-02 11:42, Neil Armstrong wrote:
> Hi,
>
> On 02/09/2019 05:54, Cheng-Yi Chiang wrote:
>> In the designware databook, the sequence of enabling audio clock and
>> setting format is not clearly specified.
>> Currently, audio clock is enabled in the end of hw_param ops after
>> setting format.
>>
>> On some monitors, there is a possibility that audio does not come out.
>> Fix this by enabling audio clock in audio_startup ops
>> before hw_param ops setting format.
>>
>> Signed-off-by: Cheng-Yi Chiang <cychiang@...omium.org>
>> Reviewed-by: Douglas Anderson <dianders@...omium.org>
>> Reviewed-by: Jonas Karlman <jonas@...boo.se>
>> Tested-by: Douglas Anderson <dianders@...omium.org>
>> ---
>>  Changes from v1:
>>  1. Move audio_startup to the front of audio_shutdown.
>>  2. Fix the indentation of audio_startup equal sign using tab.
>>  3. Rebase the patch on linux-next/master.
>>  4. Add Reviewed-by and Tested-by fields from dianders@...omium.org.
>>  5. Add Reviewed-by field from jonas@...boo.se.
>>
>>  drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>> index 1d15cf9b6821..34d8e837555f 100644
>> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-i2s-audio.c
>> @@ -109,6 +109,14 @@ static int dw_hdmi_i2s_hw_params(struct device *dev, void *data,
>>  	hdmi_write(audio, conf0, HDMI_AUD_CONF0);
>>  	hdmi_write(audio, conf1, HDMI_AUD_CONF1);
>>  
>> +	return 0;
>> +}
>> +
>> +static int dw_hdmi_i2s_audio_startup(struct device *dev, void *data)
>> +{
>> +	struct dw_hdmi_i2s_audio_data *audio = data;
>> +	struct dw_hdmi *hdmi = audio->hdmi;
>> +
>>  	dw_hdmi_audio_enable(hdmi);
>>  
>>  	return 0;
>> @@ -153,6 +161,7 @@ static int dw_hdmi_i2s_get_dai_id(struct snd_soc_component *component,
>>  
>>  static struct hdmi_codec_ops dw_hdmi_i2s_ops = {
>>  	.hw_params	= dw_hdmi_i2s_hw_params,
>> +	.audio_startup  = dw_hdmi_i2s_audio_startup,
>>  	.audio_shutdown	= dw_hdmi_i2s_audio_shutdown,
>>  	.get_eld	= dw_hdmi_i2s_get_eld,
>>  	.get_dai_id	= dw_hdmi_i2s_get_dai_id,
>>
> Looks sane, Jonas should I apply it now it's rebased ?

Sure, looks sane and compiles without warnings on my build host.

Regards,
Jonas

>
> Neil