Merge tag 'drm-intel-fixes-2024-04-10' of...

Merge tag 'drm-intel-fixes-2024-04-10' of https://anongit.freedesktop.org/git/drm/drm-intel into drm-fixes

Display fixes:
- Couple CDCLK programming fixes (Ville)
- HDCP related fix (Suraj)
- 4 Bigjoiner related fixes (Ville)

Core fix:
- Fix for a circular locking around GuC on reset+wedged case (John)
Signed-off-by: Dave Airlie <airlied@redhat.com>

From: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ZhcJxlzc6zLMC1c-@intel.com

drivers/gpu/drm/i915/display/intel_cdclk.c

@@ -2534,7 +2534,8 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
 		intel_atomic_get_old_cdclk_state(state);
 	const struct intel_cdclk_state *new_cdclk_state =
 		intel_atomic_get_new_cdclk_state(state);
-	enum pipe pipe = new_cdclk_state->pipe;
+	struct intel_cdclk_config cdclk_config;
+	enum pipe pipe;
 
 	if (!intel_cdclk_changed(&old_cdclk_state->actual,
 				 &new_cdclk_state->actual))
@@ -2543,12 +2544,25 @@ intel_set_cdclk_pre_plane_update(struct intel_atomic_state *state)
 	if (IS_DG2(i915))
 		intel_cdclk_pcode_pre_notify(state);
 
-	if (pipe == INVALID_PIPE ||
-	    old_cdclk_state->actual.cdclk <= new_cdclk_state->actual.cdclk) {
-		drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
+	if (new_cdclk_state->disable_pipes) {
+		cdclk_config = new_cdclk_state->actual;
+		pipe = INVALID_PIPE;
+	} else {
+		if (new_cdclk_state->actual.cdclk >= old_cdclk_state->actual.cdclk) {
+			cdclk_config = new_cdclk_state->actual;
+			pipe = new_cdclk_state->pipe;
+		} else {
+			cdclk_config = old_cdclk_state->actual;
+			pipe = INVALID_PIPE;
+		}
 
-		intel_set_cdclk(i915, &new_cdclk_state->actual, pipe);
+		cdclk_config.voltage_level = max(new_cdclk_state->actual.voltage_level,
+						 old_cdclk_state->actual.voltage_level);
 	}
+
+	drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
+
+	intel_set_cdclk(i915, &cdclk_config, pipe);
 }
 
 /**
@@ -2566,7 +2580,7 @@ intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
 		intel_atomic_get_old_cdclk_state(state);
 	const struct intel_cdclk_state *new_cdclk_state =
 		intel_atomic_get_new_cdclk_state(state);
-	enum pipe pipe = new_cdclk_state->pipe;
+	enum pipe pipe;
 
 	if (!intel_cdclk_changed(&old_cdclk_state->actual,
 				 &new_cdclk_state->actual))
@@ -2575,12 +2589,15 @@ intel_set_cdclk_post_plane_update(struct intel_atomic_state *state)
 	if (IS_DG2(i915))
 		intel_cdclk_pcode_post_notify(state);
 
-	if (pipe != INVALID_PIPE &&
-	    old_cdclk_state->actual.cdclk > new_cdclk_state->actual.cdclk) {
+	if (!new_cdclk_state->disable_pipes &&
+	    new_cdclk_state->actual.cdclk < old_cdclk_state->actual.cdclk)
+		pipe = new_cdclk_state->pipe;
+	else
+		pipe = INVALID_PIPE;
+
 	drm_WARN_ON(&i915->drm, !new_cdclk_state->base.changed);
 
 	intel_set_cdclk(i915, &new_cdclk_state->actual, pipe);
-	}
 }
 
 static int intel_pixel_rate_to_cdclk(const struct intel_crtc_state *crtc_state)
@@ -3058,6 +3075,7 @@ static struct intel_global_state *intel_cdclk_duplicate_state(struct intel_globa
 		return NULL;
 
 	cdclk_state->pipe = INVALID_PIPE;
+	cdclk_state->disable_pipes = false;
 
 	return &cdclk_state->base;
 }
@@ -3236,6 +3254,8 @@ int intel_modeset_calc_cdclk(struct intel_atomic_state *state)
 		if (ret)
 			return ret;
 
+		new_cdclk_state->disable_pipes = true;
+
 		drm_dbg_kms(&dev_priv->drm,
 			    "Modeset required for cdclk change\n");
 	}

drivers/gpu/drm/i915/display/intel_cdclk.h

@@ -51,6 +51,9 @@ struct intel_cdclk_state {
 
 	/* bitmask of active pipes */
 	u8 active_pipes;
+
+	/* update cdclk with pipes disabled */
+	bool disable_pipes;
 };
 
 int intel_crtc_compute_min_cdclk(const struct intel_crtc_state *crtc_state);

drivers/gpu/drm/i915/display/intel_ddi.c

@@ -4256,7 +4256,12 @@ static bool m_n_equal(const struct intel_link_m_n *m_n_1,
 static bool crtcs_port_sync_compatible(const struct intel_crtc_state *crtc_state1,
 				       const struct intel_crtc_state *crtc_state2)
 {
+	/*
+	 * FIXME the modeset sequence is currently wrong and
+	 * can't deal with bigjoiner + port sync at the same time.
+	 */
 	return crtc_state1->hw.active && crtc_state2->hw.active &&
+		!crtc_state1->bigjoiner_pipes && !crtc_state2->bigjoiner_pipes &&
 		crtc_state1->output_types == crtc_state2->output_types &&
 		crtc_state1->output_format == crtc_state2->output_format &&
 		crtc_state1->lane_count == crtc_state2->lane_count &&

drivers/gpu/drm/i915/display/intel_dp.c

@@ -2725,7 +2725,11 @@ intel_dp_drrs_compute_config(struct intel_connector *connector,
 		intel_panel_downclock_mode(connector, &pipe_config->hw.adjusted_mode);
 	int pixel_clock;
 
-	if (has_seamless_m_n(connector))
+	/*
+	 * FIXME all joined pipes share the same transcoder.
+	 * Need to account for that when updating M/N live.
+	 */
+	if (has_seamless_m_n(connector) && !pipe_config->bigjoiner_pipes)
 		pipe_config->update_m_n = true;
 
 	if (!can_enable_drrs(connector, pipe_config, downclock_mode)) {

drivers/gpu/drm/i915/display/intel_dp_hdcp.c

@@ -691,12 +691,15 @@ int intel_dp_hdcp_get_remote_capability(struct intel_connector *connector,
 	u8 bcaps;
 	int ret;
 
+	*hdcp_capable = false;
+	*hdcp2_capable = false;
 	if (!intel_encoder_is_mst(connector->encoder))
 		return -EINVAL;
 
 	ret =  _intel_dp_hdcp2_get_capability(aux, hdcp2_capable);
 	if (ret)
-		return ret;
+		drm_dbg_kms(&i915->drm,
+			    "HDCP2 DPCD capability read failed err: %d\n", ret);
 
 	ret = intel_dp_hdcp_read_bcaps(aux, i915, &bcaps);
 	if (ret)

drivers/gpu/drm/i915/display/intel_psr.c

@@ -1422,6 +1422,17 @@ void intel_psr_compute_config(struct intel_dp *intel_dp,
 		return;
 	}
 
+	/*
+	 * FIXME figure out what is wrong with PSR+bigjoiner and
+	 * fix it. Presumably something related to the fact that
+	 * PSR is a transcoder level feature.
+	 */
+	if (crtc_state->bigjoiner_pipes) {
+		drm_dbg_kms(&dev_priv->drm,
+			    "PSR disabled due to bigjoiner\n");
+		return;
+	}
+
 	if (CAN_PANEL_REPLAY(intel_dp))
 		crtc_state->has_panel_replay = true;
 	else

drivers/gpu/drm/i915/display/intel_vrr.c

@@ -117,6 +117,13 @@ intel_vrr_compute_config(struct intel_crtc_state *crtc_state,
 	const struct drm_display_info *info = &connector->base.display_info;
 	int vmin, vmax;
 
+	/*
+	 * FIXME all joined pipes share the same transcoder.
+	 * Need to account for that during VRR toggle/push/etc.
+	 */
+	if (crtc_state->bigjoiner_pipes)
+		return;
+
 	if (adjusted_mode->flags & DRM_MODE_FLAG_INTERLACE)
 		return;
 

drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c

@@ -1403,14 +1403,17 @@ static void guc_cancel_busyness_worker(struct intel_guc *guc)
 	 * Trying to pass a 'need_sync' or 'in_reset' flag all the way down through
 	 * every possible call stack is unfeasible. It would be too intrusive to many
 	 * areas that really don't care about the GuC backend. However, there is the
-	 * 'reset_in_progress' flag available, so just use that.
+	 * I915_RESET_BACKOFF flag and the gt->reset.mutex can be tested for is_locked.
+	 * So just use those. Note that testing both is required due to the hideously
+	 * complex nature of the i915 driver's reset code paths.
 	 *
 	 * And note that in the case of a reset occurring during driver unload
-	 * (wedge_on_fini), skipping the cancel in _prepare (when the reset flag is set
-	 * is fine because there is another cancel in _finish (when the reset flag is
-	 * not).
+	 * (wedged_on_fini), skipping the cancel in reset_prepare/reset_fini (when the
+	 * reset flag/mutex are set) is fine because there is another explicit cancel in
+	 * intel_guc_submission_fini (when the reset flag/mutex are not).
 	 */
-	if (guc_to_gt(guc)->uc.reset_in_progress)
+	if (mutex_is_locked(&guc_to_gt(guc)->reset.mutex) ||
+	    test_bit(I915_RESET_BACKOFF, &guc_to_gt(guc)->reset.flags))
 		cancel_delayed_work(&guc->timestamp.work);
 	else
 		cancel_delayed_work_sync(&guc->timestamp.work);
@@ -1424,8 +1427,6 @@ static void __reset_guc_busyness_stats(struct intel_guc *guc)
 	unsigned long flags;
 	ktime_t unused;
 
-	guc_cancel_busyness_worker(guc);
-
 	spin_lock_irqsave(&guc->timestamp.lock, flags);
 
 	guc_update_pm_timestamp(guc, &unused);
@@ -2004,13 +2005,6 @@ void intel_guc_submission_cancel_requests(struct intel_guc *guc)
 
 void intel_guc_submission_reset_finish(struct intel_guc *guc)
 {
-	/*
-	 * Ensure the busyness worker gets cancelled even on a fatal wedge.
-	 * Note that reset_prepare is not allowed to because it confuses lockdep.
-	 */
-	if (guc_submission_initialized(guc))
-		guc_cancel_busyness_worker(guc);
-
 	/* Reset called during driver load or during wedge? */
 	if (unlikely(!guc_submission_initialized(guc) ||
 		     !intel_guc_is_fw_running(guc) ||
@@ -2136,6 +2130,7 @@ void intel_guc_submission_fini(struct intel_guc *guc)
 	if (!guc->submission_initialized)
 		return;
 
+	guc_fini_engine_stats(guc);
 	guc_flush_destroyed_contexts(guc);
 	guc_lrc_desc_pool_destroy_v69(guc);
 	i915_sched_engine_put(guc->sched_engine);

drivers/gpu/drm/i915/gt/uc/intel_uc.c

@@ -637,6 +637,10 @@ void intel_uc_reset_finish(struct intel_uc *uc)
 {
 	struct intel_guc *guc = &uc->guc;
 
+	/*
+	 * NB: The wedge code path results in prepare -> prepare -> finish -> finish.
+	 * So this function is sometimes called with the in-progress flag not set.
+	 */
 	uc->reset_in_progress = false;
 
 	/* Firmware expected to be running when this function is called */