On Thu, May 23, 2024 at 05:47:36PM +0300, Imre Deak wrote:
> On Thu, May 23, 2024 at 05:41:17PM +0300, Ville Syrjälä wrote:
> > On Mon, May 20, 2024 at 09:58:07PM +0300, Imre Deak wrote:
> > > From: Imre Deak <imre.deak@xxxxxxxxx>
> > >
> > > The next patch adds sending a modeset-retry uevent after a link training
> > > failure to all MST connectors on link. This requires the atomic state,
> > > so pass it to intel_dp_start_link_train(). In case of SST where
> > > retraining still happens by calling this function directly instead of a
> > > modeset commit the atomic state is not available and NULL is passed
> > > instead. This is ok, since in this case the encoder's only DP connector
> > > is available from intel_dp->attached_connector not requiring the atomic
> > > state.
> > >
> > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/display/g4x_dp.c | 2 +-
> > > drivers/gpu/drm/i915/display/intel_ddi.c | 6 +++---
> > > drivers/gpu/drm/i915/display/intel_dp.c | 2 +-
> > > drivers/gpu/drm/i915/display/intel_dp_link_training.c | 4 +++-
> > > drivers/gpu/drm/i915/display/intel_dp_link_training.h | 4 +++-
> > > 5 files changed, 11 insertions(+), 7 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/g4x_dp.c b/drivers/gpu/drm/i915/display/g4x_dp.c
> > > index 4363e32a834df..0d7424a7581e6 100644
> > > --- a/drivers/gpu/drm/i915/display/g4x_dp.c
> > > +++ b/drivers/gpu/drm/i915/display/g4x_dp.c
> > > @@ -707,7 +707,7 @@ static void intel_enable_dp(struct intel_atomic_state *state,
> > > intel_dp_configure_protocol_converter(intel_dp, pipe_config);
> > > intel_dp_check_frl_training(intel_dp);
> > > intel_dp_pcon_dsc_configure(intel_dp, pipe_config);
> > > - intel_dp_start_link_train(intel_dp, pipe_config);
> > > + intel_dp_start_link_train(state, intel_dp, pipe_config);
> > > intel_dp_stop_link_train(intel_dp, pipe_config);
> > > }
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > index 86358ec27e685..58e57a7704811 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> > > @@ -2586,7 +2586,7 @@ static void mtl_ddi_pre_enable_dp(struct intel_atomic_state *state,
> > > * Pattern, wait for 5 idle patterns (DP_TP_STATUS Min_Idles_Sent)
> > > * (timeout after 800 us)
> > > */
> > > - intel_dp_start_link_train(intel_dp, crtc_state);
> > > + intel_dp_start_link_train(state, intel_dp, crtc_state);
> > >
> > > /* 6.n Set DP_TP_CTL link training to Normal */
> > > if (!is_trans_port_sync_mode(crtc_state))
> > > @@ -2728,7 +2728,7 @@ static void tgl_ddi_pre_enable_dp(struct intel_atomic_state *state,
> > > * Pattern, wait for 5 idle patterns (DP_TP_STATUS Min_Idles_Sent)
> > > * (timeout after 800 us)
> > > */
> > > - intel_dp_start_link_train(intel_dp, crtc_state);
> > > + intel_dp_start_link_train(state, intel_dp, crtc_state);
> > >
> > > /* 7.k Set DP_TP_CTL link training to Normal */
> > > if (!is_trans_port_sync_mode(crtc_state))
> > > @@ -2795,7 +2795,7 @@ static void hsw_ddi_pre_enable_dp(struct intel_atomic_state *state,
> > > to_intel_connector(conn_state->connector),
> > > crtc_state);
> > > intel_dp_sink_set_fec_ready(intel_dp, crtc_state, true);
> > > - intel_dp_start_link_train(intel_dp, crtc_state);
> > > + intel_dp_start_link_train(state, intel_dp, crtc_state);
> > > if ((port != PORT_A || DISPLAY_VER(dev_priv) >= 9) &&
> > > !is_trans_port_sync_mode(crtc_state))
> > > intel_dp_stop_link_train(intel_dp, crtc_state);
> > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > > index 7c824c5a13346..1f0b7cceea2dc 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > > @@ -5214,7 +5214,7 @@ int intel_dp_retrain_link(struct intel_encoder *encoder,
> > >
> > > intel_dp_check_frl_training(intel_dp);
> > > intel_dp_pcon_dsc_configure(intel_dp, crtc_state);
> > > - intel_dp_start_link_train(intel_dp, crtc_state);
> > > + intel_dp_start_link_train(NULL, intel_dp, crtc_state);
> >
> > I was going to suggest s/crtc_state/crtc/ for this, but the state==NULL
> > definitiely makes that impossible. I think we need to document each and
> > every function where the atomic state may be NULL and thus needs to be
> > passed the crtc_state as well. Otherwise someone (probably me) is likely
> > going to attempt some cleanups which will then explode, or someone will
> > just attempt to dig out something from the full atomic state (eg.
> > state->base.dev).
>
> This is meant to be a temporary solution, for maybe a few weeks after
> this gets merged after which retraining should be switched over to be a
> modeset in all cases; but agreed it's better to document that in
> intel_dp_start_link_train(), will add that.
The documentation should go all the way to the bottom IMO.
Anything that gets passed the state by this guy can now also
end up with state==NULL.
>
> >
> > > intel_dp_stop_link_train(intel_dp, crtc_state);
> > > break;
> > > }
> > > 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 e804f0b801c02..4f60daa97407d 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> > > @@ -1453,6 +1453,7 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp,
> > >
> > > /**
> > > * intel_dp_start_link_train - start link training
> > > + * @state: Atomic state
> > > * @intel_dp: DP struct
> > > * @crtc_state: state for CRTC attached to the encoder
> > > *
> > > @@ -1461,7 +1462,8 @@ intel_dp_128b132b_link_train(struct intel_dp *intel_dp,
> > > * fails.
> > > * After calling this function intel_dp_stop_link_train() must be called.
> > > */
> > > -void intel_dp_start_link_train(struct intel_dp *intel_dp,
> > > +void intel_dp_start_link_train(struct intel_atomic_state *state,
> > > + struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state)
> > > {
> > > struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > > 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 19836a8a4f904..f658230960333 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h
> > > @@ -8,6 +8,7 @@
> > >
> > > #include <drm/display/drm_dp_helper.h>
> > >
> > > +struct intel_atomic_state;
> > > struct intel_crtc_state;
> > > struct intel_dp;
> > >
> > > @@ -25,7 +26,8 @@ void intel_dp_program_link_training_pattern(struct intel_dp *intel_dp,
> > > void intel_dp_set_signal_levels(struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state,
> > > enum drm_dp_phy dp_phy);
> > > -void intel_dp_start_link_train(struct intel_dp *intel_dp,
> > > +void intel_dp_start_link_train(struct intel_atomic_state *state,
> > > + struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state);
> > > void intel_dp_stop_link_train(struct intel_dp *intel_dp,
> > > const struct intel_crtc_state *crtc_state);
> > > --
> > > 2.43.3
> >
> > --
> > Ville Syrjälä
> > Intel
--
Ville Syrjälä
Intel
