[alsa-devel] [PATCH 3/3] ALSA: hda - Improved position reporting on SKL+

[Vinod Koul]

On Fri, Mar 31, 2017 at 10:49:30AM +0200, Takashi Iwai wrote:
> Apply the same methods to obtain the current stream position as ASoC
> Intel SKL driver uses.  It reads the position from DPIB for a playback
> stream while it still reads from the position buffer for a capture
> stream.  For a capture stream, some ugly workaround is needed to
> settle down the inconsistent position.
> 
> Signed-off-by: Takashi Iwai <tiwai at suse.de>
> ---
>  sound/pci/hda/hda_intel.c | 36 ++++++++++++++++++++++++++++++++++--
>  1 file changed, 34 insertions(+), 2 deletions(-)
> 
> diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
> index a48330f4a1a9..64db6698214c 100644
> --- a/sound/pci/hda/hda_intel.c
> +++ b/sound/pci/hda/hda_intel.c
> @@ -77,6 +77,7 @@ enum {
>  	POS_FIX_POSBUF,
>  	POS_FIX_VIACOMBO,
>  	POS_FIX_COMBO,
> +	POS_FIX_SKL,
>  };
>  
>  /* Defines for ATI HD Audio support in SB450 south bridge */
> @@ -148,7 +149,7 @@ module_param_array(model, charp, NULL, 0444);
>  MODULE_PARM_DESC(model, "Use the given board model.");
>  module_param_array(position_fix, int, NULL, 0444);
>  MODULE_PARM_DESC(position_fix, "DMA pointer read method."
> -		 "(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO).");
> +		 "(-1 = system default, 0 = auto, 1 = LPIB, 2 = POSBUF, 3 = VIACOMBO, 4 = COMBO, 5 = SKL+).");

do we have people use this module param, or is it find what works for
them...

-- 
~Vinod