[Intel-gfx] [PATCH 1/3] drm/i915: Introduce encoder->compute_config_late()

[Manasi Navare]

From: Ville Syrjälä <ville.syrj...@linux.intel.com>

Add an optional secondary encoder state compute hook. This gets
called after the normak .compute_config() has been called for
all the encoders in the state. Thus in the new hook we can rely
on all derived state populated by .compute_config() to be already
set up. Should be useful for MST and port sync master/slave
transcoder selection.

Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_display.c  | 39 +++++++++++++++++++
 .../drm/i915/display/intel_display_types.h    |  3 ++
 2 files changed, 42 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c 
b/drivers/gpu/drm/i915/display/intel_display.c
index c0e5002ce64c..de4ab51216f6 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -13416,6 +13416,35 @@ intel_modeset_pipe_config(struct intel_crtc_state 
*pipe_config)
        return 0;
 }
 
+static int
+intel_modeset_pipe_config_late(struct intel_crtc_state *crtc_state)
+{
+       struct intel_atomic_state *state =
+               to_intel_atomic_state(crtc_state->uapi.state);
+       struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+       struct drm_connector_state *conn_state;
+       struct drm_connector *connector;
+       int i;
+
+       for_each_new_connector_in_state(&state->base, connector,
+                                       conn_state, i) {
+               struct intel_encoder *encoder =
+                       to_intel_encoder(conn_state->best_encoder);
+               int ret;
+
+               if (conn_state->crtc != &crtc->base ||
+                   !encoder->compute_config_late)
+                       continue;
+
+               ret = encoder->compute_config_late(encoder, crtc_state,
+                                                  conn_state);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
 bool intel_fuzzy_clock_check(int clock1, int clock2)
 {
        int diff;
@@ -14817,6 +14846,16 @@ static int intel_atomic_check(struct drm_device *dev,
                ret = intel_modeset_pipe_config(new_crtc_state);
                if (ret)
                        goto fail;
+       }
+
+       for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+                                           new_crtc_state, i) {
+               if (!needs_modeset(new_crtc_state))
+                       continue;
+
+               ret = intel_modeset_pipe_config_late(new_crtc_state);
+               if (ret)
+                       goto fail;
 
                intel_crtc_check_fastset(old_crtc_state, new_crtc_state);
        }
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h 
b/drivers/gpu/drm/i915/display/intel_display_types.h
index 33ba93863488..51f0108a6e09 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -140,6 +140,9 @@ struct intel_encoder {
        int (*compute_config)(struct intel_encoder *,
                              struct intel_crtc_state *,
                              struct drm_connector_state *);
+       int (*compute_config_late)(struct intel_encoder *,
+                                  struct intel_crtc_state *,
+                                  struct drm_connector_state *);
        void (*update_prepare)(struct intel_atomic_state *,
                               struct intel_encoder *,
                               struct intel_crtc *);
-- 
2.19.1

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