[Intel-gfx] [PATCH 2/4] drm/i915: Add comments about fixed pipe->transcoder/PLL mapping

[Imre Deak]

On Thu, 2016-05-12 at 16:30 +0300, Ville Syrjälä wrote:
> On Thu, May 12, 2016 at 04:18:50PM +0300, Imre Deak wrote:
> > Code checkers may complain about the explicit casts between different
> > enum types, so add comments for known-valid cases to help future
> > triaging of such complaints.
> > 
> > Signed-off-by: Imre Deak <imre.deak at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_display.c | 5 +++++
> >  1 file changed, 5 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> > index b60d9b6..763726d 100644
> > --- a/drivers/gpu/drm/i915/intel_display.c
> > +++ b/drivers/gpu/drm/i915/intel_display.c
> > @@ -9294,6 +9294,7 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
> >  		ironlake_get_fdi_m_n_config(crtc, pipe_config);
> >  
> >  		if (HAS_PCH_IBX(dev_priv)) {
> > +			/* the pipe->pll mapping is fixed */
> 
> Should perhaps say 'pch transocder->pll mapping' here.

Ok, but then 'pipe->pch transcoder and pch transcoder->pll mapping is
fixed'?

> >  			pll_id = (enum intel_dpll_id) crtc->pipe;
> >  		} else {
> >  			tmp = I915_READ(PCH_DPLL_SEL);
> > @@ -9844,6 +9845,10 @@ static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
> >  	enum intel_display_power_domain power_domain;
> >  	u32 tmp;
> >  
> > +	/*
> > +	 * The transcoder->pipe mapping is fixed with the exception of the eDP
> 
> Saying 'pipe->transcoder mapping' would feel more natural to me
> since that's the way the data flows. Also that's the way assignment in
> the code happens.

Ok, will change that.

> But I can live with the current thing too, so
> Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> > +	 * transcoder handled below.
> > +	 */
> >  	pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
> >  
> >  	/*
> > -- 
> > 2.5.0
> > 
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>