Re: [CI 1/2] drm/i915/icl: Add allowed DP rates for Icelake

[Manasi Navare <manasi.d.navare@intel.com>]

On Tue, Jun 12, 2018 at 03:15:53PM +0300, Ville Syrjälä wrote:
> On Mon, Jun 11, 2018 at 03:26:54PM -0700, Paulo Zanoni wrote:
> > From: Manasi Navare <manasi.d.navare@intel.com>
> > 
> > For ICL, on Combo PHY the allowed max rates are:
> >  - HBR3 8.1 eDP (DDIA)
> >  - HBR2 5.4 DisplayPort (DDIB)
> > and for MG PHY/TC DDI Ports allowed DP rates are:
> >  - HBR3 8.1 DisplayPort (DP alternate mode, DP over TBT,
> >  - DP on legacy connector - DDIC/D/E/F)
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Reviewed-by: James Ausmus <james.ausmus@intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> > Signed-off-by: James Ausmus <james.ausmus@intel.com>
> > [Paulo: bikeshed to keep future platforms on "else".]
> > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_dp.c | 21 +++++++++++++++++++--
> >  1 file changed, 19 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> > index 37b9f62aeb6e..8371159cc192 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -256,6 +256,20 @@ static int cnl_max_source_rate(struct intel_dp *intel_dp)
> >  	return 810000;
> >  }
> >  
> > +static int icl_max_source_rate(struct intel_dp *intel_dp)
> > +{
> > +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> > +	enum port port = dig_port->base.port;
> > +
> > +	/* On Combo PHY port A max speed is HBR3 for all Vccio voltages
> > +	 * and on Combo PHY Port B the maximum supported is HBR2.
> > +	 */
> 
> And what about the other ports? If port B is the only
> exception why are we even discussing port A specifically
> here?

All the MG PHY ports (C/D/E/F)  support a max of HBR3 that is 810000 but for
Combo PHY ports which is Port A or B, HBR3 only supported for Port A
but for Port B it is max of HBR2 which is 540000 hence the comment for Combo PHY
ports and if port B then just return HBR2

Manasi

> 
> > +	if (port == PORT_B)
> > +		return 540000;
> > +
> > +	return 810000;
> > +}
> > +
> >  static void
> >  intel_dp_set_source_rates(struct intel_dp *intel_dp)
> >  {
> > @@ -285,10 +299,13 @@ intel_dp_set_source_rates(struct intel_dp *intel_dp)
> >  	/* This should only be done once */
> >  	WARN_ON(intel_dp->source_rates || intel_dp->num_source_rates);
> >  
> > -	if (IS_CANNONLAKE(dev_priv)) {
> > +	if (INTEL_GEN(dev_priv) >= 10) {
> >  		source_rates = cnl_rates;
> >  		size = ARRAY_SIZE(cnl_rates);
> > -		max_rate = cnl_max_source_rate(intel_dp);
> > +		if (INTEL_GEN(dev_priv) == 10)
> > +			max_rate = cnl_max_source_rate(intel_dp);
> > +		else
> > +			max_rate = icl_max_source_rate(intel_dp);
> >  	} else if (IS_GEN9_LP(dev_priv)) {
> >  		source_rates = bxt_rates;
> >  		size = ARRAY_SIZE(bxt_rates);
> > -- 
> > 2.14.4
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Ville Syrjälä
> Intel
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx