[Intel-gfx] [PATCH V2 4/4] ALSA HDA: Force HDMI pins enabled

[Takashi Iwai]

At Tue, 31 Jul 2012 10:47:05 +0800,
Wang Xingchao wrote:
> 
> There's one issue for HDMI pins, even the related pin will be enabled
> when the stream is active but the GPU registers show the PIN is not in
> active state, so we force all pins in active state and donot close it
> when the stream is closed.
> 
> Signed-off-by: Wang Xingchao <xingchao.wang at intel.com>

Oh no, this is a bad workaround.

Please be more exact at which timing the pin must be set.
Setting all the time is just a wrong approach.

Also, at the next time, please Cc to alsa-devel and other developers.
I don't want that such a patch is merged secretly through drm tree :)

> ---
>  sound/pci/hda/patch_hdmi.c |   15 ++++++++-------
>  1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
> index ad319d4..64cc9e0 100644
> --- a/sound/pci/hda/patch_hdmi.c
> +++ b/sound/pci/hda/patch_hdmi.c
> @@ -421,13 +421,17 @@ static void hdmi_write_dip_byte(struct hda_codec *codec, hda_nid_t pin_nid,
>  
>  static void hdmi_init_pin(struct hda_codec *codec, hda_nid_t pin_nid)
>  {
> +	/* Force all output Pins enabled */
> +	snd_printk(KERN_DEBUG "HDMI: enable all output\n");
> +	snd_hda_codec_write(codec, pin_nid, 0,
> +			    AC_VERB_SET_PIN_WIDGET_CONTROL, 0x40);

Don't put debug prints unconditionally.

> +
>  	/* Unmute */
> -	if (get_wcaps(codec, pin_nid) & AC_WCAP_OUT_AMP)
> +	if (get_wcaps(codec, pin_nid) & AC_WCAP_OUT_AMP) {
> +		snd_printk(KERN_DEBUG "HDMI: unmute pin %d\n", pin_nid);

Ditto.


thanks,

Takashi


>  		snd_hda_codec_write(codec, pin_nid, 0,
>  				AC_VERB_SET_AMP_GAIN_MUTE, AMP_OUT_UNMUTE);
> -	/* Disable pin out until stream is active*/
> -	snd_hda_codec_write(codec, pin_nid, 0,
> -			    AC_VERB_SET_PIN_WIDGET_CONTROL, 0);
> +	}
>  }
>  
>  static int hdmi_get_channel_count(struct hda_codec *codec, hda_nid_t cvt_nid)
> @@ -1190,9 +1194,6 @@ static int generic_hdmi_playback_pcm_cleanup(struct hda_pcm_stream *hinfo,
>  
>  		pinctl = snd_hda_codec_read(codec, per_pin->pin_nid, 0,
>  					    AC_VERB_GET_PIN_WIDGET_CONTROL, 0);
> -		snd_hda_codec_write(codec, per_pin->pin_nid, 0,
> -				    AC_VERB_SET_PIN_WIDGET_CONTROL,
> -				    pinctl & ~PIN_OUT);
>  		snd_hda_spdif_ctls_unassign(codec, pin_idx);
>  	}
>  
> -- 
> 1.7.9.5
> 
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