[alsa-devel] [PATCH v2] drm/i915: set proper N/CTS in modeset

[Ville Syrjälä]

On Tue, Oct 13, 2015 at 02:21:31PM +0000, Yang, Libin wrote:
> + gfx driver team.
> 
> Hi David,
> 
> > -----Original Message-----
> > From: David Henningsson [mailto:david.henningsson at canonical.com]
> > Sent: Tuesday, October 13, 2015 9:43 PM
> > To: alsa-devel at alsa-project.org; Yang, Libin
> > Subject: Re: [alsa-devel] [PATCH v2] drm/i915: set proper N/CTS in
> > modeset
> > 
> > 
> > 
> > On 2015-09-25 03:36, libin.yang at intel.com wrote:
> > > @@ -24,8 +24,18 @@
> > >   #ifndef _I915_COMPONENT_H_
> > >   #define _I915_COMPONENT_H_
> > >
> > > +/* MAX_PORT is the number of port
> > > + * It must be sync with I915_MAX_PORTS defined i915_drv.h
> > > + * 5 should be enough as only HSW, BDW, SKL need such fix.
> > > + */
> > > +#define MAX_PORTS 5
> > > +
> > >   struct i915_audio_component {
> > >   	struct device *dev;
> > > +	/**
> > > +	 * @aud_sample_rate: the array of audio sample rate per port
> > > +	 */
> > > +	int aud_sample_rate[MAX_PORTS];
> > 
> > Just a quick question as I was trying to understand the code:
> > 
> > aud_sample_rate seems only set and get on the i915 side, never on the
> > hda side.
> > 
> > In short, why is this variable here, and not in e g, as a single integer
> > in the intel_digital_port struct?
> > 
> > That way we also avoid the possibility of MAX_PORTS becoming out of
> > sync
> > with the i915 side.
> 
> Put it in struct i915_audio_component just because it is audio related and
> easy for management.
> 
> It seems to put it in intel_digital_port will be easier.

IIRC that's more or less how I pseudo-coded it in one of my replies in
one of the threads discussing this... 

Yeah here
http://lists.freedesktop.org/archives/intel-gfx/2015-August/074267.html

-- 
Ville Syrjälä
Intel OTC