drm/i915: Make intel_{mpllb,c10pll}_state_verify() safer

intel_{mpllb,c10pll}_state_verify() blows up if you call them
for a non-modeset/fastset commit on account of the relevant
connector not being part of the overall atomic state.
Currently the state checker only runs for modeset/fastset
commits, but for testing purposes it is sometimes desirable
to run it for other commits too. Check for modeset/fastset
in intel_{mpllb,c10pll}_state_verify() itself to make this safe.

v2: Give the new intel_c10pll_state_verify() the same treatment
    Add comment to explain why we do this

Reviewed-by: Jani Nikula <jani.nikula@intel.com> #v1
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230414190159.7904-1-ville.syrjala@linux.intel.com

drivers/gpu/drm/i915/display/intel_cx0_phy.c

@@ -1874,6 +1874,11 @@ void intel_c10pll_state_verify(struct intel_atomic_state *state,
 	if (!new_crtc_state->hw.active)
 		return;
 
+	/* intel_get_crtc_new_encoder() only works for modeset/fastset commits */
+	if (!intel_crtc_needs_modeset(new_crtc_state) &&
+	    !intel_crtc_needs_fastset(new_crtc_state))
+		return;
+
 	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
 	phy = intel_port_to_phy(i915, encoder->port);
 

drivers/gpu/drm/i915/display/intel_snps_phy.c

@@ -2007,6 +2007,11 @@ void intel_mpllb_state_verify(struct intel_atomic_state *state,
 	if (!new_crtc_state->hw.active)
 		return;
 
+	/* intel_get_crtc_new_encoder() only works for modeset/fastset commits */
+	if (!intel_crtc_needs_modeset(new_crtc_state) &&
+	    !intel_crtc_needs_fastset(new_crtc_state))
+		return;
+
 	encoder = intel_get_crtc_new_encoder(state, new_crtc_state);
 	intel_mpllb_readout_hw_state(encoder, &mpllb_hw_state);