[alsa-devel] [PATCH] ALSA: hda - skip depop delay before D3 for Haswell and Valleyview2 display codec

[Takashi Iwai]

At Thu,  5 Dec 2013 18:35:48 -0500,
mengdong.lin at intel.com wrote:
> 
> From: Mengdong Lin <mengdong.lin at intel.com>
> 
> This patch skips the default depop delay before D3 for Haswell (10 ms) and
> Valleyview2 (100 ms) display codec, to reduce codec suspend time.
> 
> The analog part of display audio is implemented in the external display. Some
> displays have weak pop noise while others not when suspending, no matter there
> is the default delay or not.
> 
> Signed-off-by: Mengdong Lin <mengdong.lin at intel.com>

Thanks, applied.


Takashi

> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index 2306645..e14359a 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -2022,6 +2022,10 @@ static int patch_generic_hdmi(struct hda_codec *codec)
>  		intel_haswell_fixup_enable_dp12(codec);
>  	}
>  
> +	if (is_haswell(codec) || is_valleyview(codec)) {
> +		codec->depop_delay = 0;
> +	}
> +
>  	if (hdmi_parse_codec(codec) < 0) {
>  		codec->spec = NULL;
>  		kfree(spec);
> -- 
> 1.8.1.2
>