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greybus: connection: add no-flow-control connection flag 

Add a no-flow-control connection flag, which is set for connection that
should not have any flow-control feature enabled.

This flag is specifically set for all connections to the legacy ES3
bootrom, and will also be used by the camera driver eventually.

Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-05-11 10:17:55 +02:00 committed by Greg Kroah-Hartman
parent 501cc8bd09
commit 0e9b41ab98
2 changed files with 11 additions and 3 deletions
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7
drivers/staging/greybus/connection.c
View File

@ -183,6 +183,8 @@ _gb_connection_create(struct gb_host_device *hd, int hd_cport_id,
connection->bundle = bundle;
connection->handler = handler;
connection->flags = flags;
if (intf && (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES))
connection->flags |= GB_CONNECTION_FLAG_NO_FLOWCTRL;
connection->state = GB_CONNECTION_STATE_DISABLED;
atomic_set(&connection->op_cycle, 0);
@ -338,11 +340,10 @@ gb_connection_svc_connection_create(struct gb_connection *connection)
intf = connection->intf;
/*
* Enable either E2EFC or CSD, unless the interface does not support
* any CPort features.
* Enable either E2EFC or CSD, unless no flow control is requested.
*/
cport_flags = GB_SVC_CPORT_FLAG_CSV_N;
if (intf->quirks & GB_INTERFACE_QUIRK_NO_CPORT_FEATURES) {
if (gb_connection_flow_control_disabled(connection)) {
cport_flags |= GB_SVC_CPORT_FLAG_CSD_N;
} else if (gb_connection_e2efc_enabled(connection)) {
cport_flags |= GB_SVC_CPORT_FLAG_CSD_N |

7
drivers/staging/greybus/connection.h
View File

@ -14,6 +14,7 @@
#include <linux/kfifo.h>
#define GB_CONNECTION_FLAG_CSD BIT(0)
#define GB_CONNECTION_FLAG_NO_FLOWCTRL BIT(1)
enum gb_connection_state {
GB_CONNECTION_STATE_INVALID = 0,
@ -88,6 +89,12 @@ static inline bool gb_connection_e2efc_enabled(struct gb_connection *connection)
return !(connection->flags & GB_CONNECTION_FLAG_CSD);
}
static inline bool
gb_connection_flow_control_disabled(struct gb_connection *connection)
{
return connection->flags & GB_CONNECTION_FLAG_NO_FLOWCTRL;
}
static inline void *gb_connection_get_data(struct gb_connection *connection)
{
return connection->private;