[Intel-gfx] [10/12] drm/i915: Introduce HPD_PORT_TC<n>

[Ville Syrjälä]

On Mon, Sep 14, 2020 at 04:58:33PM +0000, Souza, Jose wrote:
> On Mon, 2020-09-14 at 17:48 +0300, Ville Syrjälä wrote:
> > On Sat, Sep 12, 2020 at 01:30:23AM +0000, Souza, Jose wrote:
> > > On Wed, 2020-07-01 at 00:55 +0300, Ville Syrjala wrote:
> > > > From: Ville Syrjälä <
> > > > ville.syrjala at linux.intel.com
> > > > 
> > > > 
> > > > Make a clean split between hpd pins for DDI vs. TC. This matches
> > > > how the actual hardware is split.
> > > > 
> > > > And with this we move the DDI/PHY->HPD pin mapping into the encoder
> > > > init instead of having to remap yet again in the interrupt code.
> > > > 
> > > > Signed-off-by: Ville Syrjälä <
> > > > ville.syrjala at linux.intel.com
> > > > 
> > > > 
> > > > ---
> > > >  drivers/gpu/drm/i915/display/intel_ddi.c     |  65 +++++++++-
> > > >  drivers/gpu/drm/i915/display/intel_hotplug.c |  25 +---
> > > >  drivers/gpu/drm/i915/i915_drv.h              |  17 +--
> > > >  drivers/gpu/drm/i915/i915_irq.c              | 121 +++++--------------
> > > >  4 files changed, 102 insertions(+), 126 deletions(-)
> > > > 
> > > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > > index d024491738b3..a2c9815c5abc 100644
> > > > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > > > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > > @@ -4847,6 +4847,57 @@ intel_ddi_max_lanes(struct intel_digital_port *intel_dport)
> > > >  	return max_lanes;
> > > >  }
> > > >  
> > > > +static enum hpd_pin tgl_hpd_pin(struct drm_i915_private *dev_priv,
> > > > +				enum port port)
> > > > +{
> > > > +	if (port >= PORT_D)
> > > > +		return HPD_PORT_TC1 + port - PORT_D;
> > > > +	else
> > > > +		return HPD_PORT_A + port - PORT_A;
> > > > +}
> > > > +
> > > > +static enum hpd_pin rkl_hpd_pin(struct drm_i915_private *dev_priv,
> > > > +				enum port port)
> > > > +{
> > > > +	if (HAS_PCH_TGP(dev_priv))
> > > > +		return tgl_hpd_pin(dev_priv, port);
> > > > +
> > > > +	if (port >= PORT_D)
> > > > +		return HPD_PORT_C + port - PORT_D;
> > > 
> > > The above looks wrong, for it would match with only the return bellow.
> > 
> > On rkl+tgp we want:
> > PORT_A (DDI A)   -> HPD_PORT_A
> > PORT_B (DDI B)   -> HPD_PORT_B
> > PORT_D (DDI TC1) -> HPD_PORT_TC1
> > PORT_E (DDI TC2) -> HPD_PORT_TC2
> > 
> > On rkl+cmp we want:
> > PORT_A (DDI A)   -> HPD_PORT_A
> > PORT_B (DDI B)   -> HPD_PORT_B
> > PORT_D (DDI TC1) -> HPD_PORT_C
> > PORT_E (DDI TC2) -> HPD_PORT_D
> 
> oohh okay, missed this.
> 
> > 
> > > > +	else
> > > > +		return HPD_PORT_A + port - PORT_A;
> > > > +}
> > > > +
> > > > +static enum hpd_pin icl_hpd_pin(struct drm_i915_private *dev_priv,
> > > > +				enum port port)
> > > > +{
> > > > +	if (port >= PORT_C)
> > > > +		return HPD_PORT_TC1 + port - PORT_C;
> > > > +	else
> > > > +		return HPD_PORT_A + port - PORT_A;
> > > > +}
> > > > +
> > > > +static enum hpd_pin ehl_hpd_pin(struct drm_i915_private *dev_priv,
> > > > +				enum port port)
> > > > +{
> > > > +	if (port == PORT_D)
> > > > +		return HPD_PORT_A;
> > > > +
> > > > +	if (HAS_PCH_MCC(dev_priv))
> > > > +		return icl_hpd_pin(dev_priv, port);
> > > 
> > > Maybe call tgl_hpd_pin() for HAS_PCH_MCC()? The code bellow will match but just for consistency.
> > 
> > On jsl+mcc we want:
> > PORT_A/D (DDI A/D) -> HPD_PORT_A
> > PORT_B   (DDI B)   -> HPD_PORT_B
> > PORT_C   (DDI C)   -> HPD_PORT_TC1
> > 
> > on jsl+icp we want:
> > PORT_A/D (DDI A/D) -> HPD_PORT_A
> > PORT_B   (DDI B)   -> HPD_PORT_B
> > PORT_C   (DDI C)   -> HPD_PORT_C
> > 
> > 
> 
> The above would be the output of tgl_hpd_pin() but okay as it can be associate with SPT, LPT, ICP and TGP better keep the current code.

I suspect we probably want to change this to the already discussed
more declarative approach at some point, so it'll be easier to see
what maps to what. But in the meantime this at least gets this
hpd pin mapping stuff out from the guts of the irq code.

> 
> Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

Ta.

-- 
Ville Syrjälä
Intel