[Intel-gfx] [PATCH v4 5/6] drm/i915/display: Check if pipe fastset is allowed by external dependencies
Souza, Jose
jose.souza at intel.com
Thu Dec 19 20:39:26 UTC 2019
On Wed, 2019-12-18 at 20:33 +0000, Souza, Jose wrote:
> On Wed, 2019-12-18 at 22:26 +0200, Ville Syrjälä wrote:
> > On Wed, Dec 18, 2019 at 08:19:15PM +0000, Souza, Jose wrote:
> > > On Wed, 2019-12-18 at 21:39 +0200, Ville Syrjälä wrote:
> > > > On Wed, Dec 18, 2019 at 10:59:09AM -0800, José Roberto de Souza
> > > > wrote:
> > > > > Check if fastset is allowed by external dependencies like
> > > > > other
> > > > > pipes
> > > > > and transcoders.
> > > > >
> > > > > Right now this patch only forces a fullmodeset in MST slaves
> > > > > of
> > > > > MST
> > > > > masters that needs a fullmodeset but it will be needed for
> > > > > port
> > > > > sync
> > > > > as well.
> > > > >
> > > > > v3:
> > > > > - moved handling to intel_atomic_check() this way is
> > > > > guarantee
> > > > > that
> > > > > all pipes will have its state computed
> > > > >
> > > > > v4:
> > > > > - added a function to return if MST master neeeds modeset to
> > > > > simply
> > > > > code in intel_atomic_check()
> > > > >
> > > > > Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
> > > > > Cc: Lucas De Marchi <lucas.demarchi at intel.com>
> > > > > Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
> > > > > Cc: Manasi Navare <manasi.d.navare at intel.com>
> > > > > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > > > > ---
> > > > > drivers/gpu/drm/i915/display/intel_display.c | 53
> > > > > +++++++++++++++-
> > > > > ----
> > > > > drivers/gpu/drm/i915/display/intel_dp_mst.c | 14 ++++++
> > > > > drivers/gpu/drm/i915/display/intel_dp_mst.h | 3 ++
> > > > > 3 files changed, 57 insertions(+), 13 deletions(-)
> > > > >
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> > > > > b/drivers/gpu/drm/i915/display/intel_display.c
> > > > > index a4f252d05b37..2a406891567b 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_display.c
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_display.c
> > > > > @@ -13903,19 +13903,6 @@ static void
> > > > > intel_crtc_check_fastset(const
> > > > > struct intel_crtc_state *old_crtc_sta
> > > > >
> > > > > new_crtc_state->uapi.mode_changed = false;
> > > > > new_crtc_state->update_pipe = true;
> > > > > -
> > > > > - /*
> > > > > - * If we're not doing the full modeset we want to
> > > > > - * keep the current M/N values as they may be
> > > > > - * sufficiently different to the computed values
> > > > > - * to cause problems.
> > > > > - *
> > > > > - * FIXME: should really copy more fuzzy state here
> > > > > - */
> > > > > - new_crtc_state->fdi_m_n = old_crtc_state->fdi_m_n;
> > > > > - new_crtc_state->dp_m_n = old_crtc_state->dp_m_n;
> > > > > - new_crtc_state->dp_m2_n2 = old_crtc_state->dp_m2_n2;
> > > > > - new_crtc_state->has_drrs = old_crtc_state->has_drrs;
> > > > > }
> > > > >
> > > > > static int intel_crtc_add_planes_to_state(struct
> > > > > intel_atomic_state *state,
> > > > > @@ -14083,6 +14070,46 @@ static int intel_atomic_check(struct
> > > > > drm_device *dev,
> > > > > any_ms = true;
> > > > > }
> > > > >
> > > > > + /**
> > > > > + * Check if fastset is allowed by external dependencies
> > > > > like
> > > > > other
> > > > > + * pipes and transcoders.
> > > > > + *
> > > > > + * Right now it only forces a fullmodeset when the MST
> > > > > master
> > > > > + * transcoder did not changed but the pipe of the
> > > > > master
> > > > > transcoder
> > > > > + * needs a fullmodeset so all slaves also needs to do a
> > > > > fullmodeset.
> > > > > + */
> > > > > + for_each_new_intel_crtc_in_state(state, crtc,
> > > > > new_crtc_state,
> > > > > i) {
> > > > > + enum transcoder master = new_crtc_state-
> > > > > > mst_master_transcoder;
> > > > > +
> > > > > + if
> > > > > (!intel_dp_mst_is_slave_trans(new_crtc_state) ||
> > > > > + needs_modeset(new_crtc_state))
> > > > > + continue;
> > > > > +
> > > > > + if
> > > > > (intel_dp_mst_master_trans_needs_modeset(state,
> > > > > master)) {
> > > >
> > > > I think this has the loops the opposite way of what I was
> > > > thinking,
> > > > but should work fine I think... OK. I'm convinced your way is
> > > > in
> > > > fact
> > > > better.
> > > >
> > > > > + new_crtc_state->uapi.mode_changed =
> > > > > true;
> > > > > + new_crtc_state->update_pipe = false;
> > > > > + }
> > > > > + }
> > > > > +
> > > > > + for_each_oldnew_intel_crtc_in_state(state, crtc,
> > > > > old_crtc_state,
> > > > > + new_crtc_state, i)
> > > > > {
> > > > > + if (needs_modeset(new_crtc_state))
> > > > > + continue;
> > > >
> > > > I suppose there isn't any way we should have crtcs in the state
> > > > that
> > > > neither have update_pipe or needs_modeset flagged here. Could
> > > > maybe
> > > > WARN_ON(!update_pipe) here if we're being paranoid.
> > >
> > > Adding the WARN_ON
Ah we can't add this WARN_ON(), is most atomic states the previous CRTC
states is added even if it dont need any modification.
Those are handled here:
for_each_oldnew_intel_crtc_in_state(state, crtc,
old_crtc_state,
new_crtc_state, i) {
if (!needs_modeset(new_crtc_state)) {
/* Light copy */
intel_crtc_copy_uapi_to_hw_state_nomodeset(new_
crtc_state);
continue;
}
> > >
> > > > > +
> > > > > + /*
> > > > > + * If we're not doing the full modeset we want
> > > > > to
> > > > > + * keep the current M/N values as they may be
> > > > > + * sufficiently different to the computed
> > > > > values
> > > > > + * to cause problems.
> > > > > + *
> > > > > + * FIXME: should really copy more fuzzy state
> > > > > here
> > > > > + */
> > > > > + new_crtc_state->fdi_m_n = old_crtc_state-
> > > > > > fdi_m_n;
> > > > > + new_crtc_state->dp_m_n = old_crtc_state-
> > > > > > dp_m_n;
> > > > > + new_crtc_state->dp_m2_n2 = old_crtc_state-
> > > > > > dp_m2_n2;
> > > > > + new_crtc_state->has_drrs = old_crtc_state-
> > > > > > has_drrs;
> > > >
> > > > Still a bit unhappy having this state copy inlined in
> > > > intel_atomic_check().
> > > >
> > > > > + }
> > > > > +
> > > > > if (any_ms && !check_digital_port_conflicts(state)) {
> > > > > DRM_DEBUG_KMS("rejecting conflicting digital
> > > > > port
> > > > > configuration\n");
> > > > > ret = EINVAL;
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > > > b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > > > index efd14b0b507b..4aba1d702a83 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> > > > > @@ -854,3 +854,17 @@ bool intel_dp_mst_is_slave_trans(const
> > > > > struct
> > > > > intel_crtc_state *crtc_state)
> > > > > return crtc_state->mst_master_transcoder !=
> > > > > INVALID_TRANSCODER
> > > > > &&
> > > > > crtc_state->mst_master_transcoder != crtc_state-
> > > > > > cpu_transcoder;
> > > > > }
> > > > > +
> > > > > +bool intel_dp_mst_master_trans_needs_modeset(struct
> > > > > intel_atomic_state *state,
> > > > > + enum transcoder
> > > > > master)
> > > >
> > > > Are we going to need this elsewhere? Or be static in
> > > > intel_display.c?
> > > > Not that people are 100% happy of stuffing everything in there.
> > >
> > > Not needed elsewhere, I'm also trying to not put more stuff in
> > > intel_display.c.
> > >
> > > > > +{
> > > > > + struct intel_crtc_state *new_crtc_state;
> > > > > + struct intel_crtc *crtc;
> > > > > + int i;
> > > > > +
> > > > > + for_each_new_intel_crtc_in_state(state, crtc,
> > > > > new_crtc_state,
> > > > > i)
> > > > > + if (new_crtc_state->mst_master_transcoder ==
> > > > > master)
> > > >
> > > > So we need to modeset everything when either the master or any
> > > > other slave wants to modeset? That is, we can't just modeset
> > > > slaves
> > > > independently and only force the modesets for all slaves if the
> > > > master
> > > > needs a modeset?
> > >
> > > If a slave needs a modeset we don't need to do a modeset in
> > > master
> > > or
> > > in other slaves.
> > >
> > > This is doing independent modeset in slaves and forcing modeset
> > > to
> > > all
> > > slaves when master needs as modeset.
> >
> > If you just wanted to check if the master needs a modeset then
> > shouldn't
> > it just compare crtc_state->cpu_transcoder == master?
>
> Good catch, thanks.
>
> > And in that case it's not at all MST specific and we could just
> > call
> > it
> > intel_cpu_transcoder_needs_modeset() or something.
>
> That is true, moving to intel_display then.
>
> > > > > + return
> > > > > drm_atomic_crtc_needs_modeset(&new_crtc_state->uapi);
> > > > > +
> > > > > + return false;
> > > > > +}
> > > > > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h
> > > > > b/drivers/gpu/drm/i915/display/intel_dp_mst.h
> > > > > index 854724f68f09..72cb486f32ab 100644
> > > > > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.h
> > > > > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h
> > > > > @@ -8,6 +8,7 @@
> > > > >
> > > > > #include <linux/types.h>
> > > > >
> > > > > +struct intel_atomic_state;
> > > > > struct intel_digital_port;
> > > > > struct intel_crtc_state;
> > > > >
> > > > > @@ -16,5 +17,7 @@ void intel_dp_mst_encoder_cleanup(struct
> > > > > intel_digital_port *intel_dig_port);
> > > > > int intel_dp_mst_encoder_active_links(struct
> > > > > intel_digital_port
> > > > > *intel_dig_port);
> > > > > bool intel_dp_mst_is_master_trans(const struct
> > > > > intel_crtc_state
> > > > > *crtc_state);
> > > > > bool intel_dp_mst_is_slave_trans(const struct
> > > > > intel_crtc_state
> > > > > *crtc_state);
> > > > > +bool intel_dp_mst_master_trans_needs_modeset(struct
> > > > > intel_atomic_state *state,
> > > > > + enum transcoder
> > > > > master);
> > > > >
> > > > > #endif /* __INTEL_DP_MST_H__ */
> > > > > --
> > > > > 2.24.1
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