On Tue, 2018-11-06 at 18:06 +0200, Imre Deak wrote: > On ICL DMC/PCODE retains the HW context only for port A across DC > transitions, for the other port B combo PHY, it doesn't. So we need > to > do this manually after exiting from DC6. Do the reinit even after > exiting from DC5, it won't hurt since we only reinit the PHY in case > it's needed (in case it was disabled to begin with). > > As can be guessed from the bugzilla report leaving the PHY uninited > will > lead to a later timeout during the port B specific AUX and DDI_IO > power > well enabling. > > v2: > - Apply the fix on all GEN>=11 platforms. (Rodrigo) > > Bspec: 21257 > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108070 > Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx> > Cc: José Roberto de Souza <jose.souza@xxxxxxxxx> > Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> > Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_runtime_pm.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c > b/drivers/gpu/drm/i915/intel_runtime_pm.c > index f8da471e81aa..c20f25d6964a 100644 > --- a/drivers/gpu/drm/i915/intel_runtime_pm.c > +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c > @@ -843,6 +843,14 @@ static void gen9_dc_off_power_well_enable(struct > drm_i915_private *dev_priv, > > if (IS_GEN9_LP(dev_priv)) > bxt_verify_ddi_phy_power_wells(dev_priv); > + > + if (INTEL_GEN(dev_priv) >= 11) > + /* > + * DMC retains HW context only for port A, the other > combo > + * PHY's HW context for port B is lost after DC > transitions, > + * so we need to restore it manually. > + */ > + icl_combo_phys_init(dev_priv); > } > > static void gen9_dc_off_power_well_disable(struct drm_i915_private > *dev_priv,
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