drm/i915/dsi: Implement encoder->shutdown() for icl+

Plug in the encoder->shutdown() hook for icl+ DSI so that
we are guaranteed to respect the power cycle delay during
reboots and whatnot.
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230608203057.23759-8-ville.syrjala@linux.intel.com

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

@@ -1979,6 +1979,7 @@ void icl_dsi_init(struct drm_i915_private *dev_priv)
 	encoder->get_power_domains = gen11_dsi_get_power_domains;
 	encoder->disable_clock = gen11_dsi_gate_clocks;
 	encoder->is_clock_enabled = gen11_dsi_is_clock_enabled;
+	encoder->shutdown = intel_dsi_shutdown;
 
 	/* register DSI connector with DRM subsystem */
 	drm_connector_init(&dev_priv->drm, connector, &gen11_dsi_connector_funcs,

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

@@ -22,6 +22,13 @@ void intel_dsi_wait_panel_power_cycle(struct intel_dsi *intel_dsi)
 		msleep(intel_dsi->panel_pwr_cycle_delay - panel_power_off_duration);
 }
 
+void intel_dsi_shutdown(struct intel_encoder *encoder)
+{
+	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
+
+	intel_dsi_wait_panel_power_cycle(intel_dsi);
+}
+
 int intel_dsi_bitrate(const struct intel_dsi *intel_dsi)
 {
 	int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);

drivers/gpu/drm/i915/display/intel_dsi.h

@@ -174,5 +174,6 @@ struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
 					   const struct mipi_dsi_host_ops *funcs,
 					   enum port port);
 void intel_dsi_wait_panel_power_cycle(struct intel_dsi *intel_dsi);
+void intel_dsi_shutdown(struct intel_encoder *encoder);
 
 #endif /* _INTEL_DSI_H */

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

@@ -929,13 +929,6 @@ static void intel_dsi_post_disable(struct intel_atomic_state *state,
 	intel_dsi->panel_power_off_time = ktime_get_boottime();
 }
 
-static void intel_dsi_shutdown(struct intel_encoder *encoder)
-{
-	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
-
-	intel_dsi_wait_panel_power_cycle(intel_dsi);
-}
-
 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
 				   enum pipe *pipe)
 {