drm/i915/display: force qgv check after the hw state readout

The current intel_bw_atomic_check do not check the possbility
of a sagv configuration change after the hw state readout.
Hence cannot update the sagv configuration until some other
relevant changes like data rates, number of planes etc. happen.
Introduce a flag to force qgv check in such cases.
Reviewed-by: Jouni Högander <jouni.hogander@intel.com>
Signed-off-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240405113533.338553-7-vinod.govindapillai@intel.com

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

@@ -755,6 +755,7 @@ void intel_bw_crtc_update(struct intel_bw_state *bw_state,
 		intel_bw_crtc_data_rate(crtc_state);
 	bw_state->num_active_planes[crtc->pipe] =
 		intel_bw_crtc_num_active_planes(crtc_state);
+	bw_state->force_check_qgv = true;
 
 	drm_dbg_kms(&i915->drm, "pipe %c data rate %u num active planes %u\n",
 		    pipe_name(crtc->pipe),
@@ -1339,8 +1340,9 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	new_bw_state = intel_atomic_get_new_bw_state(state);
 
 	if (new_bw_state &&
-	    intel_can_enable_sagv(i915, old_bw_state) !=
-	    intel_can_enable_sagv(i915, new_bw_state))
+	    (intel_can_enable_sagv(i915, old_bw_state) !=
+	     intel_can_enable_sagv(i915, new_bw_state) ||
+	     new_bw_state->force_check_qgv))
 		changed = true;
 
 	/*
@@ -1354,6 +1356,8 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	if (ret)
 		return ret;
 
+	new_bw_state->force_check_qgv = false;
+
 	return 0;
 }
 

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

@@ -47,6 +47,12 @@ struct intel_bw_state {
 	 */
 	u16 qgv_points_mask;
 
+	/*
+	 * Flag to force the QGV comparison in atomic check right after the
+	 * hw state readout
+	 */
+	bool force_check_qgv;
+
 	int min_cdclk[I915_MAX_PIPES];
 	unsigned int data_rate[I915_MAX_PIPES];
 	u8 num_active_planes[I915_MAX_PIPES];