greybus: interface: clean up ES3-bootroom-quirk handling

Clean up handling of the ES3-bootrom quirks by adding an interface
quirk-flags field that is set appropriately when we detect that the ES3
bootrom is running.

Note that we need to reserve the DME_DIS_UNIPRO_BOOT_STARTED and
DME_DIS_FALLBACK_UNIPRO_BOOT_STARTED status values for the ES3 bootrom,
which does not support any CPort features (unlike later boot stages).
Add a BOOTROM infix to the defines to make this more clear.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/connection.c

@@ -337,9 +337,12 @@ gb_connection_svc_connection_create(struct gb_connection *connection)
 
 	intf = connection->intf;
 
-	/* The ES2/ES3 bootrom requires E2EFC, CSD and CSV to be disabled. */
+	/*
+	 * Enable either E2EFC or CSD, unless the interface does not support
+	 * any CPort features.
+	 */
 	cport_flags = GB_SVC_CPORT_FLAG_CSV_N;
-	if (intf->boot_over_unipro) {
+	if (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES) {
 		cport_flags |= GB_SVC_CPORT_FLAG_CSD_N;
 	} else if (gb_connection_e2efc_enabled(connection)) {
 		cport_flags |= GB_SVC_CPORT_FLAG_CSD_N |

drivers/staging/greybus/control.c

@@ -155,8 +155,7 @@ int gb_control_get_interface_version_operation(struct gb_interface *intf)
 	struct gb_connection *connection = intf->control->connection;
 	int ret;
 
-	/* The ES3 bootrom fails to boot if this request it sent to it */
-	if (intf->boot_over_unipro)
+	if (intf->quirks & GB_INTERFACE_QUIRK_NO_INTERFACE_VERSION)
 		return 0;
 
 	ret = gb_operation_sync(connection, GB_CONTROL_TYPE_INTERFACE_VERSION,

drivers/staging/greybus/greybus_protocols.h

@@ -894,11 +894,11 @@ struct gb_svc_dme_peer_set_response {
 #define DME_ATTR_ES3_INIT_STATUS		0x6101
 
 /* Return value from init-status attributes listed above */
-#define DME_DIS_SPI_BOOT_STARTED		0x02
-#define DME_DIS_TRUSTED_SPI_BOOT_FINISHED	0x03
-#define DME_DIS_UNTRUSTED_SPI_BOOT_FINISHED	0x04
-#define DME_DIS_UNIPRO_BOOT_STARTED		0x06
-#define DME_DIS_FALLBACK_UNIPRO_BOOT_STARTED	0x09
+#define DME_DIS_SPI_BOOT_STARTED			0x02
+#define DME_DIS_TRUSTED_SPI_BOOT_FINISHED		0x03
+#define DME_DIS_UNTRUSTED_SPI_BOOT_FINISHED		0x04
+#define DME_DIS_BOOTROM_UNIPRO_BOOT_STARTED		0x06
+#define DME_DIS_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED	0x09
 
 struct gb_svc_route_create_request {
 	__u8	intf1_id;

drivers/staging/greybus/interface.c

@@ -55,7 +55,7 @@ static int gb_interface_read_and_clear_init_status(struct gb_interface *intf)
 	}
 
 	/*
-	 * Check if the interface needs to boot over UniPro.
+	 * Extract the init status.
 	 *
 	 * For ES2: We need to check lowest 8 bits of 'value'.
 	 * For ES3: We need to check highest 8 bits out of 32 of 'value'.
@@ -67,9 +67,18 @@ static int gb_interface_read_and_clear_init_status(struct gb_interface *intf)
 	else
 		init_status = value >> 24;
 
-	if (init_status == DME_DIS_UNIPRO_BOOT_STARTED ||
-			init_status == DME_DIS_FALLBACK_UNIPRO_BOOT_STARTED)
-		intf->boot_over_unipro = true;
+	/*
+	 * Check if the interface is executing the quirky ES3 bootrom that
+	 * requires E2EFC, CSD and CSV to be disabled and that does not
+	 * support the interface-version request.
+	 */
+	switch (init_status) {
+	case DME_DIS_BOOTROM_UNIPRO_BOOT_STARTED:
+	case DME_DIS_BOOTROM_FALLBACK_UNIPRO_BOOT_STARTED:
+		intf->quirks |= GB_INTERFACE_QUIRK_NO_CPORT_FEATURES;
+		intf->quirks |= GB_INTERFACE_QUIRK_NO_INTERFACE_VERSION;
+		break;
+	}
 
 	/* Clear the init status. */
 	return gb_svc_dme_peer_set(hd->svc, intf->interface_id, attr,

drivers/staging/greybus/interface.h

@@ -10,6 +10,9 @@
 #ifndef __INTERFACE_H
 #define __INTERFACE_H
 
+#define GB_INTERFACE_QUIRK_NO_CPORT_FEATURES		BIT(0)
+#define GB_INTERFACE_QUIRK_NO_INTERFACE_VERSION		BIT(1)
+
 struct gb_interface {
 	struct device dev;
 	struct gb_control *control;
@@ -36,8 +39,8 @@ struct gb_interface {
 
 	struct gb_host_device *hd;
 
-	/* The interface needs to boot over unipro */
-	bool boot_over_unipro;
+	unsigned long quirks;
+
 	bool disconnected;
 };
 #define to_gb_interface(d) container_of(d, struct gb_interface, dev)