On Mon, Dec 16, 2019 at 02:07:41PM -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
>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Cc: Manasi Navare <manasi.d.nav...@intel.com>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_display.c | 63 ++++++++++++++++----
> 1 file changed, 50 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index f1c0687bf69b..2627a7bcb45c 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -13941,19 +13941,6 @@ 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,
> @@ -14121,6 +14108,56 @@ 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) {
> + struct intel_crtc_state *new_crtc_state_iter;
> + struct intel_crtc *crtc_iter;
> + int j;
> +
> + if (!intel_dp_mst_is_slave_trans(new_crtc_state) ||
> + needs_modeset(new_crtc_state))
shouldn't this be
if (!mst_master || !needs_modeset)
continue;
?
> + continue;
> +
> + for_each_new_intel_crtc_in_state(state, crtc_iter,
> + new_crtc_state_iter, j) {
> + if (new_crtc_state->mst_master_transcoder !=
> + new_crtc_state_iter->cpu_transcoder)
> + continue;
> +
> + if (needs_modeset(new_crtc_state_iter)) {
> + new_crtc_state->uapi.mode_changed = true;
> + new_crtc_state->update_pipe = false;
> + }
> + break;
Hmm. So I guess the break here is because we're going to keep iterating
the outer loop anyway? Don't think that works with the s/slave/master/
fix above.
I suggest moving this inner loop into a separate function entirely.
Could simply pass in the master_transcoder to that function and then
we wouldn't even have this clash with variable names for the two
crtcs/crtc_states.
Somethig like (with better funciton names ofc :)
mst_modeset_slaves(state, master_transcoder)
{
for_each() {
if (master_transcoder == crtc_state->master_transcoder)
modeset=1;
}
}
atomic_check()
{
for_each()
compute();
for_each() {
if (master && needs_modeset()
mst_modeset_slaves(state, crtc_state->cpu_transcoder);
}
for_each() {
if (fastset)
copy();
}
}
Or do we also need to force a modeset for the master if a slave needs a
modeset? I'm trying to think if there's a way that we could end up with
a slave changing its master (thus needing modeset) without the master
being flagged for modeset...
> + }
> + }
> +
> + for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> + new_crtc_state, i) {
> + if (needs_modeset(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;
A separate function for this fastset state copy might also be nice so we
don't have to see these mundane details in this higher level code.
> + }
> +
> if (any_ms && !check_digital_port_conflicts(state)) {
> DRM_DEBUG_KMS("rejecting conflicting digital port
> configuration\n");
> ret = EINVAL;
> --
> 2.24.1
--
Ville Syrjälä
Intel
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