Re: [Intel-gfx] [PATCH 3/4] drm/i915: ELiminate intel_pipe_to_cpu_transcoder() from assert_fdi_tx()

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Tue, Dec 10, 2019 at 06:19:24PM +0000, Souza, Jose wrote:
> On Tue, 2019-11-12 at 18:38 +0200, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Let's start to eliminate intel_pipe_to_cpu_transcoder() so that
> > we can get rid of one more crtc->config usage (which we will want
> > to nuke as well).
> > 
> > In the case of assert_fdi_tx() we know that we're never
> > dealing with the EDP transcoder so we can simply replace
> > this with a cast.
> 
> There still one EDP transcoder case when running in a HSW:
> 
> haswell_crtc_enable()
> 	lpt_pch_enable()
> 		lpt_enable_pch_transcoder()
> 			assert_fdi_tx_enabled()

The transcoder will never EDP. But this casting back and forth 
is a bit ugly. Maybe I should just kill these FDI TX asserts
from the hsw/bdw code...

> 
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display.c | 10 +++++++---
> >  1 file changed, 7 insertions(+), 3 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > b/drivers/gpu/drm/i915/display/intel_display.c
> > index e7e5497e6f2e..cabd88337822 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > @@ -1141,11 +1141,15 @@ static void assert_fdi_tx(struct
> > drm_i915_private *dev_priv,
> >  			  enum pipe pipe, bool state)
> >  {
> >  	bool cur_state;
> > -	enum transcoder cpu_transcoder =
> > intel_pipe_to_cpu_transcoder(dev_priv,
> > -								      p
> > ipe);
> >  
> >  	if (HAS_DDI(dev_priv)) {
> > -		/* DDI does not have a specific FDI_TX register */
> > +		/*
> > +		 * DDI does not have a specific FDI_TX register.
> > +		 *
> > +		 * FDI is never hooked fed from EDP transcoder
> > +		 * so pipe->transcoder cast is fine here.
> > +		 */
> > +		enum transcoder cpu_transcoder = (enum transcoder)pipe;
> >  		u32 val =
> > I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
> >  		cur_state = !!(val & TRANS_DDI_FUNC_ENABLE);
> >  	} else {

-- 
Ville Syrjälä
Intel
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