From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> Don't perform a seamless M/N update if the values aren't actually changing. This avoids doing extra shenanigans during vblank evasion needlessly. Cc: Manasi Navare <navaremanasi@xxxxxxxxxxxx> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/display/intel_display.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 6196ef76390b..c20eaf0e7a91 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -5525,7 +5525,9 @@ static void intel_crtc_check_fastset(const struct intel_crtc_state *old_crtc_sta else new_crtc_state->uapi.mode_changed = false; - if (intel_crtc_needs_modeset(new_crtc_state)) + if (intel_crtc_needs_modeset(new_crtc_state) || + intel_compare_link_m_n(&old_crtc_state->dp_m_n, + &new_crtc_state->dp_m_n)) new_crtc_state->update_m_n = false; if (!intel_crtc_needs_modeset(new_crtc_state)) -- 2.41.0
