diff mbox series

[05/14] drm/i915: Avoid triggering unwanted cdclk changes due to dbuf bandwidth changes

Message ID 20250307180139.15744-6-ville.syrjala@linux.intel.com (mailing list archive)
State New
Headers show
Series drm/i915: sagv/bw cleanup | expand

Commit Message

Ville Syrjälä March 7, 2025, 6:01 p.m. UTC 
From: Ville Syrjälä <ville.syrjala@linux.intel.com>

Currently intel_bw_calc_min_cdclk() always adds the bw_state
to the atomic state. Not only does it result in potentially
redundant work later, it's also currently causing unwanted cdclk
changes during driver load.

Check if the dbuf bw is actually changing before we decide to
pull in the bw state.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_bw.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index c9e15a068b67..16ae337376fe 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -1259,7 +1259,8 @@  int intel_bw_calc_min_cdclk(struct intel_atomic_state *state,
 	struct intel_bw_state *new_bw_state = NULL;
 	const struct intel_bw_state *old_bw_state = NULL;
 	const struct intel_cdclk_state *cdclk_state;
-	const struct intel_crtc_state *crtc_state;
+	const struct intel_crtc_state *old_crtc_state;
+	const struct intel_crtc_state *new_crtc_state;
 	int old_min_cdclk, new_min_cdclk;
 	struct intel_crtc *crtc;
 	int i;
@@ -1267,15 +1268,23 @@  int intel_bw_calc_min_cdclk(struct intel_atomic_state *state,
 	if (DISPLAY_VER(dev_priv) < 9)
 		return 0;
 
-	for_each_new_intel_crtc_in_state(state, crtc, crtc_state, i) {
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		struct intel_dbuf_bw old_dbuf_bw, new_dbuf_bw;
+
+		skl_crtc_calc_dbuf_bw(&old_dbuf_bw, old_crtc_state);
+		skl_crtc_calc_dbuf_bw(&new_dbuf_bw, new_crtc_state);
+
+		if (!intel_dbuf_bw_changed(dev_priv, &old_dbuf_bw, &new_dbuf_bw))
+			continue;
+
 		new_bw_state = intel_atomic_get_bw_state(state);
 		if (IS_ERR(new_bw_state))
 			return PTR_ERR(new_bw_state);
 
 		old_bw_state = intel_atomic_get_old_bw_state(state);
 
-		skl_crtc_calc_dbuf_bw(&new_bw_state->dbuf_bw[crtc->pipe],
-				      crtc_state);
+		new_bw_state->dbuf_bw[crtc->pipe] = new_dbuf_bw;
 	}
 
 	if (!old_bw_state)