[alsa-devel] [PATCH 1/2] ALSA: hda_controller: Separate stream_tag for input and output streams.

[Yang, Libin]

Hi Takashi,

Thanks for review. I will send another email to update the signed-off name.

Regards,
Libin


> -----Original Message-----
> From: Takashi Iwai [mailto:tiwai at suse.de]
> Sent: Thursday, December 18, 2014 4:05 PM
> To: Yang, Libin
> Cc: alsa-devel at alsa-project.org; Redzimski, Rafal F; B, Jayachandran; Koul,
> Vinod
> Subject: Re: [PATCH 1/2] ALSA: hda_controller: Separate stream_tag for
> input and output streams.
> 
> At Thu, 18 Dec 2014 14:13:50 +0800,
> libin.yang at intel.com wrote:
> >
> > From: rfredzim <rafal.f.redzimski at intel.com>
> >
> > Implemented separate stream_tag assignment for input and output
> streams.
> > According to hda specification stream tag must be unique throughout
> > the input streams group, however an output stream might use a stream
> > tag which is already in use by an input stream. This change is
> > necessary to support HW which provides a total of more than 15 stream
> > DMA engines which with legacy implementation causes an overflow on
> > SDxCTL.STRM field (and the whole SDxCTL register) and as a result
> > usage of Reserved value 0 in the SDxCTL.STRM field which confuses HDA
> controller.
> >
> > Signed-off-by: rfredzim <rafal.f.redzimski at intel.com>
> > Signed-off-by: Jayachandran B <jayachandran.b at intel.com>
> 
> The from and sign-off tags must contain the real names.
> The code change itself looks OK.
> 
> 
> thanks,
> 
> Takashi
> 
> > Signed-off-by: Libin Yang <libin.yang at intel.com>
> > Reviewed-by: Vinod Koul <vinod.koul at intel.com>
> > ---
> >  sound/pci/hda/hda_controller.c | 24 ++++++++++++++++++++++--
> >  sound/pci/hda/hda_priv.h       |  1 +
> >  2 files changed, 23 insertions(+), 2 deletions(-)
> >
> > diff --git a/sound/pci/hda/hda_controller.c
> > b/sound/pci/hda/hda_controller.c index 8337645..dcca1ef 100644
> > --- a/sound/pci/hda/hda_controller.c
> > +++ b/sound/pci/hda/hda_controller.c
> > @@ -1922,10 +1922,18 @@ int azx_mixer_create(struct azx *chip)
> > EXPORT_SYMBOL_GPL(azx_mixer_create);
> >
> >
> > +static bool is_input_stream(struct azx *chip, unsigned char index) {
> > +	return (index >= chip->capture_index_offset &&
> > +		index < chip->capture_index_offset + chip-
> >capture_streams); }
> > +
> >  /* initialize SD streams */
> >  int azx_init_stream(struct azx *chip)  {
> >  	int i;
> > +	int in_stream_tag = 0;
> > +	int out_stream_tag = 0;
> >
> >  	/* initialize each stream (aka device)
> >  	 * assign the starting bdl address to each stream (device) @@
> > -1938,9 +1946,21 @@ int azx_init_stream(struct azx *chip)
> >  		azx_dev->sd_addr = chip->remap_addr + (0x20 * i + 0x80);
> >  		/* int mask: SDI0=0x01, SDI1=0x02, ... SDO3=0x80 */
> >  		azx_dev->sd_int_sta_mask = 1 << i;
> > -		/* stream tag: must be non-zero and unique */
> >  		azx_dev->index = i;
> > -		azx_dev->stream_tag = i + 1;
> > +
> > +		/* stream tag must be unique throughout
> > +		 * the stream direction group,
> > +		 * valid values 1...15
> > +		 * use separate stream tag if the flag
> > +		 * AZX_DCAPS_SEPARATE_STREAM_TAG is used
> > +		 */
> > +		if (chip->driver_caps &
> AZX_DCAPS_SEPARATE_STREAM_TAG)
> > +			azx_dev->stream_tag =
> > +				is_input_stream(chip, i) ?
> > +				++in_stream_tag :
> > +				++out_stream_tag;
> > +		else
> > +			azx_dev->stream_tag = i + 1;
> >  	}
> >
> >  	return 0;
> > diff --git a/sound/pci/hda/hda_priv.h b/sound/pci/hda/hda_priv.h index
> > aa484fd..166e3e8 100644
> > --- a/sound/pci/hda/hda_priv.h
> > +++ b/sound/pci/hda/hda_priv.h
> > @@ -171,6 +171,7 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2,
> SDO3 };
> >  #define AZX_DCAPS_I915_POWERWELL (1 << 27)	/* HSW i915
> powerwell support */
> >  #define AZX_DCAPS_CORBRP_SELF_CLEAR (1 << 28)	/* CORBRP clears
> itself after reset */
> >  #define AZX_DCAPS_NO_MSI64      (1 << 29)	/* Stick to 32-bit MSIs */
> > +#define AZX_DCAPS_SEPARATE_STREAM_TAG	(1 << 30) /* capture
> and playback use separate stream tag */
> >
> >  enum {
> >  	AZX_SNOOP_TYPE_NONE ,
> > --
> > 1.9.1
> >