drm/i915: Skip some bw_state readout on pre-icl

We only compute bw_state->data_rate and bw_state->num_active_planes
on icl+. Do the same during readout so that we don't leave random
junk inside the state.

v2: Skip the whole intel_bw_crtc_update() (Vinod)

Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250306163420.3961-13-ville.syrjala@linux.intel.com

diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 30e6f33d6f301a758ca351ed4552c9d02d38104d..e4d79b496e1279125c120c12ef80446d59f7d5bf 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -1441,7 +1441,8 @@ void intel_bw_update_hw_state(struct intel_display *display)
                if (crtc_state->hw.active)
                        bw_state->active_pipes |= BIT(pipe);
 
-               intel_bw_crtc_update(bw_state, crtc_state);
+               if (DISPLAY_VER(display) >= 11)
+                       intel_bw_crtc_update(bw_state, crtc_state);
        }
 }