Quelle  intel_modeset_verify.c   Sprache: C

// SPDX-License-Identifier: MIT
/*
 * Copyright © 2022 Intel Corporation
 *
 * High level crtc/connector/encoder modeset state verification.
 */

#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_print.h>

#include "intel_atomic.h"
#include "intel_crtc.h"
#include "intel_crtc_state_dump.h"
#include "intel_cx0_phy.h"
#include "intel_display.h"
#include "intel_display_core.h"
#include "intel_display_types.h"
#include "intel_fdi.h"
#include "intel_modeset_verify.h"
#include "intel_snps_phy.h"
#include "skl_watermark.h"

/*
 * Cross check the actual hw state with our own modeset state tracking (and its
 * internal consistency).
 */
static void intel_connector_verify_state(const struct intel_crtc_state *crtc_state,
      const struct drm_connector_state *conn_state)
{
 struct intel_connector *connector = to_intel_connector(conn_state->connector);
 struct intel_display *display = to_intel_display(connector);

 drm_dbg_kms(display->drm, "[CONNECTOR:%d:%s]\n",
      connector->base.base.id, connector->base.name);

 if (connector->get_hw_state(connector)) {
  struct intel_encoder *encoder = intel_attached_encoder(connector);

  INTEL_DISPLAY_STATE_WARN(display, !crtc_state,
      "connector enabled without attached crtc\n");

  if (!crtc_state)
   return;

  INTEL_DISPLAY_STATE_WARN(display, !crtc_state->hw.active,
      "connector is active, but attached crtc isn't\n");

  if (!encoder || encoder->type == INTEL_OUTPUT_DP_MST)
   return;

  INTEL_DISPLAY_STATE_WARN(display,
      conn_state->best_encoder != &encoder->base,
      "atomic encoder doesn't match attached encoder\n");

  INTEL_DISPLAY_STATE_WARN(display, conn_state->crtc != encoder->base.crtc,
      "attached encoder crtc differs from connector crtc\n");
 } else {
  INTEL_DISPLAY_STATE_WARN(display, crtc_state && crtc_state->hw.active,
      "attached crtc is active, but connector isn't\n");
  INTEL_DISPLAY_STATE_WARN(display, !crtc_state && conn_state->best_encoder,
      "best encoder set without crtc!\n");
 }
}

static void
verify_connector_state(struct intel_atomic_state *state,
         struct intel_crtc *crtc)
{
 struct intel_display *display = to_intel_display(state);
 struct drm_connector *connector;
 const struct drm_connector_state *new_conn_state;
 int i;

 for_each_new_connector_in_state(&state->base, connector, new_conn_state, i) {
  struct drm_encoder *encoder = connector->encoder;
  const struct intel_crtc_state *crtc_state = NULL;

  if (new_conn_state->crtc != &crtc->base)
   continue;

  if (crtc)
   crtc_state = intel_atomic_get_new_crtc_state(state, crtc);

  intel_connector_verify_state(crtc_state, new_conn_state);

  INTEL_DISPLAY_STATE_WARN(display, new_conn_state->best_encoder != encoder,
      "connector's atomic encoder doesn't match legacy encoder\n");
 }
}

static void intel_pipe_config_sanity_check(const struct intel_crtc_state *crtc_state)
{
 struct intel_display *display = to_intel_display(crtc_state);

 if (crtc_state->has_pch_encoder) {
  int fdi_dotclock = intel_dotclock_calculate(intel_fdi_link_freq(display, crtc_state),
           &crtc_state->fdi_m_n);
  int dotclock = crtc_state->hw.adjusted_mode.crtc_clock;

  /*
 * FDI already provided one idea for the dotclock.
 * Yell if the encoder disagrees. Allow for slight
 * rounding differences.
 */
  drm_WARN(display->drm, abs(fdi_dotclock - dotclock) > 1,
    "FDI dotclock and encoder dotclock mismatch, fdi: %i, encoder: %i\n",
    fdi_dotclock, dotclock);
 }
}

static void
verify_encoder_state(struct intel_atomic_state *state)
{
 struct intel_display *display = to_intel_display(state);
 struct intel_encoder *encoder;
 struct drm_connector *connector;
 const struct drm_connector_state *old_conn_state, *new_conn_state;
 int i;

 for_each_intel_encoder(display->drm, encoder) {
  bool enabled = false, found = false;
  enum pipe pipe;

  drm_dbg_kms(display->drm, "[ENCODER:%d:%s]\n",
       encoder->base.base.id,
       encoder->base.name);

  for_each_oldnew_connector_in_state(&state->base, connector, old_conn_state,
         new_conn_state, i) {
   if (old_conn_state->best_encoder == &encoder->base)
    found = true;

   if (new_conn_state->best_encoder != &encoder->base)
    continue;

   found = true;
   enabled = true;

   INTEL_DISPLAY_STATE_WARN(display,
       new_conn_state->crtc != encoder->base.crtc,
       "connector's crtc doesn't match encoder crtc\n");
  }

  if (!found)
   continue;

  INTEL_DISPLAY_STATE_WARN(display, !!encoder->base.crtc != enabled,
      "encoder's enabled state mismatch (expected %i, found %i)\n",
      !!encoder->base.crtc, enabled);

  if (!encoder->base.crtc) {
   bool active;

   active = encoder->get_hw_state(encoder, &pipe);
   INTEL_DISPLAY_STATE_WARN(display, active,
       "encoder detached but still enabled on pipe %c.\n",
       pipe_name(pipe));
  }
 }
}

static void
verify_crtc_state(struct intel_atomic_state *state,
    struct intel_crtc *crtc)
{
 struct intel_display *display = to_intel_display(state);
 const struct intel_crtc_state *sw_crtc_state =
  intel_atomic_get_new_crtc_state(state, crtc);
 struct intel_crtc_state *hw_crtc_state;
 struct intel_crtc *primary_crtc;
 struct intel_encoder *encoder;

 hw_crtc_state = intel_crtc_state_alloc(crtc);
 if (!hw_crtc_state)
  return;

 drm_dbg_kms(display->drm, "[CRTC:%d:%s]\n", crtc->base.base.id,
      crtc->base.name);

 hw_crtc_state->hw.enable = sw_crtc_state->hw.enable;

 intel_crtc_get_pipe_config(hw_crtc_state);

 /* we keep both pipes enabled on 830 */
 if (display->platform.i830 && hw_crtc_state->hw.active)
  hw_crtc_state->hw.active = sw_crtc_state->hw.active;

 INTEL_DISPLAY_STATE_WARN(display,
     sw_crtc_state->hw.active != hw_crtc_state->hw.active,
     "crtc active state doesn't match with hw state (expected %i, found %i)\n",
     sw_crtc_state->hw.active, hw_crtc_state->hw.active);

 INTEL_DISPLAY_STATE_WARN(display, crtc->active != sw_crtc_state->hw.active,
     "transitional active state does not match atomic hw state (expected %i, found %i)\n",
     sw_crtc_state->hw.active, crtc->active);

 primary_crtc = intel_primary_crtc(sw_crtc_state);

 for_each_encoder_on_crtc(display->drm, &primary_crtc->base, encoder) {
  enum pipe pipe;
  bool active;

  active = encoder->get_hw_state(encoder, &pipe);
  INTEL_DISPLAY_STATE_WARN(display, active != sw_crtc_state->hw.active,
      "[ENCODER:%i] active %i with crtc active %i\n",
      encoder->base.base.id, active,
      sw_crtc_state->hw.active);

  INTEL_DISPLAY_STATE_WARN(display, active && primary_crtc->pipe != pipe,
      "Encoder connected to wrong pipe %c\n",
      pipe_name(pipe));

  if (active)
   intel_encoder_get_config(encoder, hw_crtc_state);
 }

 if (!sw_crtc_state->hw.active)
  goto destroy_state;

 intel_pipe_config_sanity_check(hw_crtc_state);

 if (!intel_pipe_config_compare(sw_crtc_state,
           hw_crtc_state, false)) {
  INTEL_DISPLAY_STATE_WARN(display, 1, "pipe state doesn't match!\n");
  intel_crtc_state_dump(hw_crtc_state, NULL, "hw state");
  intel_crtc_state_dump(sw_crtc_state, NULL, "sw state");
 }

destroy_state:
 intel_crtc_destroy_state(&crtc->base, &hw_crtc_state->uapi);
}

void intel_modeset_verify_crtc(struct intel_atomic_state *state,
          struct intel_crtc *crtc)
{
 const struct intel_crtc_state *new_crtc_state =
  intel_atomic_get_new_crtc_state(state, crtc);

 if (!intel_crtc_needs_modeset(new_crtc_state) &&
     !intel_crtc_needs_fastset(new_crtc_state))
  return;

 intel_wm_state_verify(state, crtc);
 verify_connector_state(state, crtc);
 verify_crtc_state(state, crtc);
 intel_dpll_state_verify(state, crtc);
 intel_mpllb_state_verify(state, crtc);
 intel_cx0pll_state_verify(state, crtc);
}

void intel_modeset_verify_disabled(struct intel_atomic_state *state)
{
 verify_encoder_state(state);
 verify_connector_state(state, NULL);
 intel_dpll_verify_disabled(state);
}