linux-kernel - RE: [PATCH 1/2] soundwire: add definition for maximum number of ports

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Date:   Tue, 18 Aug 2020 06:53:05 +0000
From:   "Liao, Bard" <bard.liao@...el.com>
To:     Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>
CC:     "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tiwai@...e.de" <tiwai@...e.de>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "jank@...ence.com" <jank@...ence.com>,
        "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
        "rander.wang@...ux.intel.com" <rander.wang@...ux.intel.com>,
        "ranjani.sridharan@...ux.intel.com" 
        <ranjani.sridharan@...ux.intel.com>,
        "hui.wang@...onical.com" <hui.wang@...onical.com>,
        "pierre-louis.bossart@...ux.intel.com" 
        <pierre-louis.bossart@...ux.intel.com>,
        "Kale, Sanyog R" <sanyog.r.kale@...el.com>,
        "Lin, Mengdong" <mengdong.lin@...el.com>
Subject: RE: [PATCH 1/2] soundwire: add definition for maximum number of ports

> -----Original Message-----
> From: Vinod Koul <vkoul@...nel.org>
> Sent: Tuesday, August 18, 2020 2:36 PM
> To: Bard Liao <yung-chuan.liao@...ux.intel.com>
> Cc: alsa-devel@...a-project.org; linux-kernel@...r.kernel.org; tiwai@...e.de;
> broonie@...nel.org; gregkh@...uxfoundation.org; jank@...ence.com;
> srinivas.kandagatla@...aro.org; rander.wang@...ux.intel.com;
> ranjani.sridharan@...ux.intel.com; hui.wang@...onical.com; pierre-
> louis.bossart@...ux.intel.com; Kale, Sanyog R <sanyog.r.kale@...el.com>; Lin,
> Mengdong <mengdong.lin@...el.com>; Liao, Bard <bard.liao@...el.com>
> Subject: Re: [PATCH 1/2] soundwire: add definition for maximum number of
> ports
> 
> On 18-08-20, 01:47, Bard Liao wrote:
> > From: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> >
> > A Device may have at most 15 physical ports (DP0, DP1..DP14).
> >
> > Signed-off-by: Pierre-Louis Bossart
> > <pierre-louis.bossart@...ux.intel.com>
> > Reviewed-by: Rander Wang <rander.wang@...ux.intel.com>
> > Reviewed-by: Guennadi Liakhovetski
> > <guennadi.liakhovetski@...ux.intel.com>
> > Signed-off-by: Bard Liao <yung-chuan.liao@...ux.intel.com>
> > ---
> >  include/linux/soundwire/sdw.h | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/include/linux/soundwire/sdw.h
> > b/include/linux/soundwire/sdw.h index 76052f12c9f7..0aa4c6af7554
> > 100644
> > --- a/include/linux/soundwire/sdw.h
> > +++ b/include/linux/soundwire/sdw.h
> > @@ -38,7 +38,8 @@ struct sdw_slave;
> >  #define SDW_FRAME_CTRL_BITS		48
> >  #define SDW_MAX_DEVICES			11
> >
> > -#define SDW_VALID_PORT_RANGE(n)		((n) <= 14 && (n) >= 1)
> > +#define SDW_MAX_PORTS			15
> > +#define SDW_VALID_PORT_RANGE(n)		((n) <
> SDW_MAX_PORTS && (n) >= 1)
> 
> What is the use of this one if we are allocating all ports always, Also, I dont
> see it used in second patch?

It is used in drivers/soundwire/stream.c and drivers/soundwire/debugfs.c.

> 
> >
> >  enum {
> >  	SDW_PORT_DIRN_SINK = 0,
> > --
> > 2.17.1
> 
> --
> ~Vinod