greybus: control: suppress bundle_activate() for bootrom

We always knew backward compatibility with the ES3 bootrom, which was
finalised about a year ago, would be a pain. Here we go again.

The bootrom does not support control requests added after it was burnt
into ROM for obvious reasons. This means that we need to suppress
sending the new bundle_activate() operation to any interface executing
the legacy bootrom.

Do so by adding a new NO_PM interface quirk (we can use the
control-protocol version for this later once we bump it).

Note that the interface-disable path (e.g. for power down) is already
handled by the FORCED_DISABLE quirk, and that the suspend/resume
paths are currently avoided by making sure that the bootrom bundle
never suspends.

Signed-off-by: Johan Hovold <[e-mail]>
Reviewed-by: Viresh Kumar <[e-mail]>
Acked-by: Bartosz Golaszewski <[e-mail]>
Tested-by: Bartosz Golaszewski <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/staging/greybus/control.c

···
 	struct gb_control_bundle_pm_response response;
 	int ret;
 
+	if (!control->has_bundle_activate)
+		return 0;
+
 	request.bundle_id = bundle_id;
 	ret = gb_operation_sync(control->connection,
 				GB_CONTROL_TYPE_BUNDLE_ACTIVATE, &request,
···
 
 	if (control->protocol_major > 0 || control->protocol_minor > 1)
 		control->has_bundle_version = true;
+
+	/* FIXME: use protocol version instead */
+	if (!(control->intf->quirks & GB_INTERFACE_QUIRK_NO_PM))
+		control->has_bundle_activate = true;
 
 	return 0;
 

drivers/staging/greybus/control.h

···
 	u8 protocol_major;
 	u8 protocol_minor;
 
+	bool has_bundle_activate;
 	bool has_bundle_version;
 
 	char *vendor_string;

drivers/staging/greybus/interface.c

···
 	 */
 	bootrom_quirks = GB_INTERFACE_QUIRK_NO_CPORT_FEATURES |
 				GB_INTERFACE_QUIRK_FORCED_DISABLE |
-				GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH;
+				GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH |
+				GB_INTERFACE_QUIRK_NO_PM;
 	switch (init_status) {
 	case GB_INIT_BOOTROM_UNIPRO_BOOT_STARTED:
 	case GB_INIT_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED:

drivers/staging/greybus/interface.h

···
 #define GB_INTERFACE_QUIRK_NO_ARA_IDS			BIT(2)
 #define GB_INTERFACE_QUIRK_FORCED_DISABLE		BIT(3)
 #define GB_INTERFACE_QUIRK_LEGACY_MODE_SWITCH		BIT(4)
+#define GB_INTERFACE_QUIRK_NO_PM			BIT(5)
 
 struct gb_interface {
 	struct device dev;