drm/cec: add drm_dp_cec_attach() as the non-edid version of set edid

Connectors have source physical address available in display
info. There's no need to parse the EDID again for this. Add
drm_dp_cec_attach() to do this.

Seems like the set_edid/unset_edid naming is a bit specific now that
there's no need to pass the EDID at all, so aim for attach/detach going
forward.

v2: Fix the embarrashing build failures

Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Cc: linux-media@vger.kernel.org
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Acked-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230825130120.1250089-1-jani.nikula@intel.com

drivers/gpu/drm/display/drm_dp_cec.c

@@ -14,6 +14,7 @@
 #include <drm/display/drm_dp_helper.h>
 #include <drm/drm_connector.h>
 #include <drm/drm_device.h>
+#include <drm/drm_edid.h>
 
 /*
  * Unfortunately it turns out that we have a chicken-and-egg situation
@@ -297,7 +298,7 @@ static void drm_dp_cec_unregister_work(struct work_struct *work)
  * were unchanged and just update the CEC physical address. Otherwise
  * unregister the old CEC adapter and create a new one.
  */
-void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
+void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address)
 {
 	struct drm_connector *connector = aux->cec.connector;
 	u32 cec_caps = CEC_CAP_DEFAULTS | CEC_CAP_NEEDS_HPD |
@@ -339,7 +340,7 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
 		if (aux->cec.adap->capabilities == cec_caps &&
 		    aux->cec.adap->available_log_addrs == num_las) {
 			/* Unchanged, so just set the phys addr */
-			cec_s_phys_addr_from_edid(aux->cec.adap, edid);
+			cec_s_phys_addr(aux->cec.adap, source_physical_address, false);
 			goto unlock;
 		}
 		/*
@@ -370,11 +371,27 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
 		 * from drm_dp_cec_register_connector() edid == NULL, so in
 		 * that case the phys addr is just invalidated.
 		 */
-		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
+		cec_s_phys_addr(aux->cec.adap, source_physical_address, false);
 	}
 unlock:
 	mutex_unlock(&aux->cec.lock);
 }
+EXPORT_SYMBOL(drm_dp_cec_attach);
+
+/*
+ * Note: Prefer calling drm_dp_cec_attach() with
+ * connector->display_info.source_physical_address if possible.
+ */
+void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
+{
+	u16 pa = CEC_PHYS_ADDR_INVALID;
+
+	if (edid && edid->extensions)
+		pa = cec_get_edid_phys_addr((const u8 *)edid,
+					    EDID_LENGTH * (edid->extensions + 1), NULL);
+
+	drm_dp_cec_attach(aux, pa);
+}
 EXPORT_SYMBOL(drm_dp_cec_set_edid);
 
 /*

include/drm/display/drm_dp_helper.h

@@ -699,6 +699,7 @@ void drm_dp_cec_irq(struct drm_dp_aux *aux);
 void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
 				   struct drm_connector *connector);
 void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
+void drm_dp_cec_attach(struct drm_dp_aux *aux, u16 source_physical_address);
 void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
 void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
 #else
@@ -716,6 +717,11 @@ static inline void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux)
 {
 }
 
+static inline void drm_dp_cec_attach(struct drm_dp_aux *aux,
+				     u16 source_physical_address)
+{
+}
+
 static inline void drm_dp_cec_set_edid(struct drm_dp_aux *aux,
 				       const struct edid *edid)
 {