drm/i915/bw: Relocate intel_bw_crtc_min_cdclk()

intel_bw_crtc_min_cdclk() (aka. the thing that deals with what bspec
calls "Maximum Pipe Read Bandwidth") doesn't really have anything to
do with the rest of intel_bw.c (which is all about SAGV/QGV and
memory bandwidth). Move it into intel_crtc.c (for the lack of a better
place).

And I don't really want to call intel_bw.c functions from intel_crtc.c,
so move out intel_bw_crtc_data_rate() as well. And when we move that we
pretty much have to move intel_bw_crtc_num_active_planes() as well since
the two are meant to be used as a pair (they both implement the same
"ignore the cursor" logic).

And in an effort to keep the namespaces at least semi-sensible we
flip the intel_bw_crtc_ prefix into intel_crtc_bw_.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20251013201236.30084-4-ville.syrjala@linux.intel.com
Reviewed-by: Mika Kahola <mika.kahola@intel.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_crtc.c b/drivers/gpu/drm/i915/display/intel_crtc.c
index 7b39c3a5887c..d300ba1dcd2c 100644
--- a/drivers/gpu/drm/i915/display/intel_crtc.c
+++ b/drivers/gpu/drm/i915/display/intel_crtc.c
@@ -795,3 +795,47 @@ bool intel_any_crtc_active_changed(struct intel_atomic_state *state)
 
 	return false;
 }
+
+unsigned int intel_crtc_bw_num_active_planes(const struct intel_crtc_state *crtc_state)
+{
+	/*
+	 * We assume cursors are small enough
+	 * to not cause bandwidth problems.
+	 */
+	return hweight8(crtc_state->active_planes & ~BIT(PLANE_CURSOR));
+}
+
+unsigned int intel_crtc_bw_data_rate(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+	struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
+	unsigned int data_rate = 0;
+	enum plane_id plane_id;
+
+	for_each_plane_id_on_crtc(crtc, plane_id) {
+		/*
+		 * We assume cursors are small enough
+		 * to not cause bandwidth problems.
+		 */
+		if (plane_id == PLANE_CURSOR)
+			continue;
+
+		data_rate += crtc_state->data_rate[plane_id];
+
+		if (DISPLAY_VER(display) < 11)
+			data_rate += crtc_state->data_rate_y[plane_id];
+	}
+
+	return data_rate;
+}
+
+/* "Maximum Pipe Read Bandwidth" */
+int intel_crtc_bw_min_cdclk(const struct intel_crtc_state *crtc_state)
+{
+	struct intel_display *display = to_intel_display(crtc_state);
+
+	if (DISPLAY_VER(display) < 12)
+		return 0;
+
+	return DIV_ROUND_UP_ULL(mul_u32_u32(intel_crtc_bw_data_rate(crtc_state), 10), 512);
+}