On Wed, Jul 15, 2020 at 12:15:35PM -0700, Manasi Navare wrote:
> On Wed, Jul 15, 2020 at 07:29:31PM +0300, Imre Deak wrote:
> > The problem the reverted patch revealed could've been fixed by commit
> > 619ad4874585 ("drm/i915/ddi: Don't frob the DP link scramble disabling flag")
> > in particular because the revealed problem (at least in one case) happened
> > when switching to the TPS4 training pattern, which needs scrambling.
> >
> > Let's try applying the HBR3 fix again.
The link training failure still happens the same way on fi-icl-u2.
> >
> > This reverts commit d3913019602e32ef6fbba8eb0167e83250cdab22.
> >
> > Cc: Matt Atwood <matthew.s.atwood@xxxxxxxxx>
> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> > Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> > Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
>
> Makes sense since the problem occured only in CI, not on
> the local testing done by Matt on his eDP panel.
>
> Reviewed-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
>
> Manasi
>
> > ---
> > drivers/gpu/drm/i915/display/intel_dp.c | 28 ++++++++++---------------
> > 1 file changed, 11 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index d6295eb20b63..a5ab405d3a12 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -137,6 +137,8 @@ static const u8 valid_dsc_slicecount[] = {1, 2, 4};
> > *
> > * If a CPU or PCH DP output is attached to an eDP panel, this function
> > * will return true, and false otherwise.
> > + *
> > + * This function is not safe to use prior to encoder type being set.
> > */
> > bool intel_dp_is_edp(struct intel_dp *intel_dp)
> > {
> > @@ -8157,8 +8159,6 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
> > intel_encoder->base.name))
> > return false;
> >
> > - intel_dp_set_source_rates(intel_dp);
> > -
> > intel_dp->reset_link_params = true;
> > intel_dp->pps_pipe = INVALID_PIPE;
> > intel_dp->active_pipe = INVALID_PIPE;
> > @@ -8174,28 +8174,22 @@ intel_dp_init_connector(struct intel_digital_port *dig_port,
> > */
> > drm_WARN_ON(dev, intel_phy_is_tc(dev_priv, phy));
> > type = DRM_MODE_CONNECTOR_eDP;
> > + intel_encoder->type = INTEL_OUTPUT_EDP;
> > +
> > + /* eDP only on port B and/or C on vlv/chv */
> > + if (drm_WARN_ON(dev, (IS_VALLEYVIEW(dev_priv) ||
> > + IS_CHERRYVIEW(dev_priv)) &&
> > + port != PORT_B && port != PORT_C))
> > + return false;
> > } else {
> > type = DRM_MODE_CONNECTOR_DisplayPort;
> > }
> >
> > + intel_dp_set_source_rates(intel_dp);
> > +
> > if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> > intel_dp->active_pipe = vlv_active_pipe(intel_dp);
> >
> > - /*
> > - * For eDP we always set the encoder type to INTEL_OUTPUT_EDP, but
> > - * for DP the encoder type can be set by the caller to
> > - * INTEL_OUTPUT_UNKNOWN for DDI, so don't rewrite it.
> > - */
> > - if (type == DRM_MODE_CONNECTOR_eDP)
> > - intel_encoder->type = INTEL_OUTPUT_EDP;
> > -
> > - /* eDP only on port B and/or C on vlv/chv */
> > - if (drm_WARN_ON(dev, (IS_VALLEYVIEW(dev_priv) ||
> > - IS_CHERRYVIEW(dev_priv)) &&
> > - intel_dp_is_edp(intel_dp) &&
> > - port != PORT_B && port != PORT_C))
> > - return false;
> > -
> > drm_dbg_kms(&dev_priv->drm,
> > "Adding %s connector on [ENCODER:%d:%s]\n",
> > type == DRM_MODE_CONNECTOR_eDP ? "eDP" : "DP",
> > --
> > 2.23.1
> >
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