Re: [Intel-gfx] [PATCH 2/7] drm/i915: Move intel_dp_get_link_status to intel_dp_link_training.c

[Imre Deak <imre.deak@intel.com>]

On Tue, Sep 22, 2020 at 04:14:24PM +0300, Ville Syrjälä wrote:
> On Tue, Sep 22, 2020 at 03:51:01PM +0300, Imre Deak wrote:
> > The link status is used to communicate the parameters of the link
> > training with the DPRX and determine if the link training is successful
> > or a retraining is needed. Accordingly move the function to read the
> > link status to intel_dp_link_training.c
> > 
> > Signed-off-by: Imre Deak <imre.deak@intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_dp.c          | 11 -----------
> >  drivers/gpu/drm/i915/display/intel_dp.h          |  2 --
> >  .../drm/i915/display/intel_dp_link_training.c    | 16 ++++++++++++++++
> >  .../drm/i915/display/intel_dp_link_training.h    |  3 +++
> >  4 files changed, 19 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 2a4a9c0e7427..ee93a00a4d5e 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -4126,17 +4126,6 @@ static void chv_dp_post_pll_disable(struct intel_atomic_state *state,
> >  	chv_phy_post_pll_disable(encoder, old_crtc_state);
> >  }
> >  
> > -/*
> > - * Fetch AUX CH registers 0x202 - 0x207 which contain
> > - * link status information
> > - */
> > -bool
> > -intel_dp_get_link_status(struct intel_dp *intel_dp, u8 link_status[DP_LINK_STATUS_SIZE])
> > -{
> > -	return drm_dp_dpcd_read(&intel_dp->aux, DP_LANE0_1_STATUS, link_status,
> > -				DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE;
> > -}
> > -
> >  static u8 intel_dp_voltage_max_2(struct intel_dp *intel_dp)
> >  {
> >  	return DP_TRAIN_VOLTAGE_SWING_LEVEL_2;
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> > index 08a1c0aa8b94..34ae7988a554 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.h
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> > @@ -100,8 +100,6 @@ void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock,
> >  			   u8 *link_bw, u8 *rate_select);
> >  bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp);
> >  bool intel_dp_source_supports_hbr3(struct intel_dp *intel_dp);
> > -bool
> > -intel_dp_get_link_status(struct intel_dp *intel_dp, u8 *link_status);
> >  
> >  bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp);
> >  int intel_dp_link_required(int pixel_clock, int bpp);
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> > index f8b53c5b5777..6d13d00db5e6 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> > @@ -34,6 +34,22 @@ intel_dp_dump_link_status(const u8 link_status[DP_LINK_STATUS_SIZE])
> >  		      link_status[3], link_status[4], link_status[5]);
> >  }
> >  
> > +/**
> > + * intel_dp_get_link_status - get the link status information for the DPRX
> > + * @intel_dp: DP struct
> > + * @link_status: buffer to return the status in
> > + *
> > + * Fetch the AUX DPCD registers for the DPRX link status.
> > + *
> > + * Returns true if the information was read successfully, false otherwise.
> > + */
> > +bool
> > +intel_dp_get_link_status(struct intel_dp *intel_dp, u8 link_status[DP_LINK_STATUS_SIZE])
> > +{
> > +	return drm_dp_dpcd_read(&intel_dp->aux, DP_LANE0_1_STATUS, link_status,
> > +				DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE;
> > +}
> > +
> >  static u8 dp_voltage_max(u8 preemph)
> >  {
> >  	switch (preemph & DP_TRAIN_PRE_EMPHASIS_MASK) {
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.h b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
> > index 01f1dabbb060..47c97f4a0d57 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h
> > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
> > @@ -10,6 +10,9 @@
> >  
> >  struct intel_dp;
> >  
> > +bool intel_dp_get_link_status(struct intel_dp *intel_dp,
> > +			      u8 link_status[DP_LINK_STATUS_SIZE]);
> > +
> 
> Do we still need it outside? Hmm, I guess we do.

Yes, for PHY auto-testing, but I think that should rather depend on the
regular link training sequence as discussed elsewhere.

> 
> Oh well
> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> >  void intel_dp_get_adjust_train(struct intel_dp *intel_dp,
> >  			       const u8 link_status[DP_LINK_STATUS_SIZE]);
> >  void intel_dp_start_link_train(struct intel_dp *intel_dp);
> > -- 
> > 2.17.1
> > 
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> 
> -- 
> Ville Syrjälä
> Intel
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