From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> commit 8d9d2a723d64b650f2e6423024ccb4a33f0cdc40 upstream. The bogus loop from compute_dbuf_slices() was copied into check_mbus_joined() as well. So this lookup is wrong as well. Fix it. Cc: stable@xxxxxxxxxxxxxxx Fixes: f4dc00863226 ("drm/i915/adl_p: MBUS programming") Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Link: https://patchwork.freedesktop.org/patch/msgid/20220207132700.481-2-ville.syrjala@xxxxxxxxxxxxxxx Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> (cherry picked from commit 053f2b85631316a9226f6340c1c0fd95634f7a5b) Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_pm.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -4843,7 +4843,7 @@ static bool check_mbus_joined(u8 active_ { int i; - for (i = 0; i < dbuf_slices[i].active_pipes; i++) { + for (i = 0; dbuf_slices[i].active_pipes != 0; i++) { if (dbuf_slices[i].active_pipes == active_pipes) return dbuf_slices[i].join_mbus; } Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are queue-5.16/drm-atomic-don-t-pollute-crtc_state-mode_blob-with-error-pointers.patch queue-5.16/drm-i915-fix-dbuf-slice-config-lookup.patch queue-5.16/drm-i915-opregion-check-port-number-bounds-for-swsci-display-power-state.patch queue-5.16/drm-i915-fix-mbus-join-config-lookup.patch