[Intel-gfx] [PATCH v3 3/8] drm/i915: Init aux_ch for HDMI ports too

[Imre Deak]

On Wed, Oct 31, 2018 at 10:29:51AM -0700, Rodrigo Vivi wrote:
> On Wed, Oct 31, 2018 at 05:14:52PM +0000, Souza, Jose wrote:
> > On Wed, 2018-10-31 at 18:26 +0200, Imre Deak wrote:
> > > From ICL onwards DDI/TypeC ports - even in HDMI static mode - need to
> > > know
> > > which AUX CH belongs to them, so initialize aux_ch for those ports
> > > too.
> > > For consistency do this for all HDMI ports, not only for DDI/TypeC
> > > ones.
> > > 
> > > Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> > > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > Cc: José Roberto de Souza <jose.souza at intel.com>
> > > Signed-off-by: Imre Deak <imre.deak at intel.com>
> > > ---
> > >  drivers/gpu/drm/i915/intel_ddi.c  | 1 +
> > >  drivers/gpu/drm/i915/intel_dp.c   | 2 +-
> > >  drivers/gpu/drm/i915/intel_hdmi.c | 1 +
> > >  3 files changed, 3 insertions(+), 1 deletion(-)
> > > 
> > > diff --git a/drivers/gpu/drm/i915/intel_ddi.c
> > > b/drivers/gpu/drm/i915/intel_ddi.c
> > > index 32a080265d03..3739ef003819 100644
> > > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > > @@ -3852,6 +3852,7 @@ void intel_ddi_init(struct drm_i915_private
> > > *dev_priv, enum port port)
> > >  			(DDI_BUF_PORT_REVERSAL | DDI_A_4_LANES);
> > >  	intel_dig_port->dp.output_reg = INVALID_MMIO_REG;
> > >  	intel_dig_port->max_lanes =
> > > intel_ddi_max_lanes(intel_dig_port);
> > > +	intel_dig_port->aux_ch = intel_aux_ch(dev_priv, port);
> > >  
> > >  	switch (port) {
> > >  	case PORT_A:
> > > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> > > b/drivers/gpu/drm/i915/intel_dp.c
> > > index 5530c604c694..6645c9faca9a 100644
> > > --- a/drivers/gpu/drm/i915/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > > @@ -1654,7 +1654,6 @@ intel_dp_aux_init(struct intel_dp *intel_dp)
> > >  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > >  	struct intel_encoder *encoder = &dig_port->base;
> > >  
> > > -	dig_port->aux_ch = intel_aux_ch(dev_priv, encoder->port);
> > >  	intel_dp->aux_power_domain = intel_aux_power_domain(intel_dp);
> > >  
> > >  	if (INTEL_GEN(dev_priv) >= 9) {
> > > @@ -6706,6 +6705,7 @@ bool intel_dp_init(struct drm_i915_private
> > > *dev_priv,
> > >  	if (port != PORT_A)
> > >  		intel_infoframe_init(intel_dig_port);
> > >  
> > > +	intel_dig_port->aux_ch = intel_aux_ch(dev_priv, port);
> > >  	if (!intel_dp_init_connector(intel_dig_port, intel_connector))
> > >  		goto err_init_connector;
> > >  
> > > diff --git a/drivers/gpu/drm/i915/intel_hdmi.c
> > > b/drivers/gpu/drm/i915/intel_hdmi.c
> > > index 129b880bce64..b50c5497048a 100644
> > > --- a/drivers/gpu/drm/i915/intel_hdmi.c
> > > +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> > > @@ -2506,5 +2506,6 @@ void intel_hdmi_init(struct drm_i915_private
> > > *dev_priv,
> > >  
> > >  	intel_infoframe_init(intel_dig_port);
> > >  
> > > +	intel_dig_port->aux_ch = intel_aux_ch(dev_priv, port);
> > 
> > Everything else looks good, I'm not just 100% confortable in
> > initializing it here just for consistency, can someone else comment
> > here?
> 
> The place is fine. My concern with this approach is the impact
> on some legacy platforms that could be using this aux for something else.
> 
> Like... That SKL with edp-to-vga converter plugged on port-E which
> uses aux from port B because this was unused because it was an HDMI plugged
> on port B.
> 
> What could be the impact in a case like this?
> 
> So to avoid regressions in some old frankensteins maybe it is better
> to add some check for type c no?!

We would have a check for type C after this patchset, we would enable
AUX on HDMI ports only if that port is a typeC port (which is always
false on SKL). I guess that's the config you mean. See the
intel_ddi_pre_pll_enable hook I added.

> 
> > 
> > >  	intel_hdmi_init_connector(intel_dig_port, intel_connector);
> > >  }
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