drm: apple: afk: Optionally match against EPICName

The dpavserv endpoint uses various EPICProviderClass depending on the
connected display.

Observed values:
- "AppleDCPAgileCDIDPDisplay" (j134c, dcp, panel)
- "AppleDCPMCDP29XX" (j274, dcp, hdmi)
- "AppleDCPPS190" (j474s, dcpext0, hdmi)
- "DCPDPService" (j474s, dcpext1, typec)

So match against against EPICName which is consistent in all cases.
This also allows the distinction between 'dcpav-service-epic' and
'dcpdp-service-epic'. Not sure what the second EPIC service is used for.

Signed-off-by: Janne Grunau <j@jannau.net>

Author: jannau

drivers/gpu/drm/apple/afk.c

@@ -293,7 +293,11 @@ static void afk_recv_handle_init(struct apple_dcp_afkep *ep, u32 channel,
             service_name = name;
         }
 
-	ops = afk_match_service(ep, service_name);
+	if (ep->match_epic_name)
+		ops = afk_match_service(ep, epic_name);
+	else
+		ops = afk_match_service(ep, service_name);
+
 	if (!ops) {
 		dev_err(ep->dcp->dev,
 			"AFK[ep:%02x]: unable to match service %s on channel %d\n",

drivers/gpu/drm/apple/afk.h

@@ -182,6 +182,8 @@ struct apple_dcp_afkep {
 	u32 num_channels;
 
 	struct dentry *debugfs_entry;
+
+	bool match_epic_name;
 };
 
 struct apple_dcp_afkep *afk_init(struct apple_dcp *dcp, u32 endpoint,