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Code Issues Releases Wiki Activity

greybus: camera: Fix data connection setup

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When the module is in the configured state, an attempt to change the
configuration must first tear down the data connection to update its
parameters, as the APB1 bridge doesn't support modifying the CSI
transmitter configuration when it is already started.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
Tested-by: Gjorgji Rosikopulos <grosikopulos@mm-sol.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Laurent Pinchart 2016-06-14 15:59:24 +03:00 committed by Greg Kroah-Hartman
parent f3d5f6613f
commit 3b8ebfeb32
1 changed files with 19 additions and 5 deletions
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24
drivers/staging/greybus/camera.c
View file

@ -33,11 +33,17 @@ struct gb_camera_debugfs_buffer {
size_t length;
};
enum gb_camera_state {
GB_CAMERA_STATE_UNCONFIGURED,
GB_CAMERA_STATE_CONFIGURED,
};
/**
* struct gb_camera - A Greybus Camera Device
* @connection: the greybus connection for camera management
* @data_connection: the greybus connection for camera data
* @mutex: protects the connection field
* @mutex: protects the connection and state fields
* @state: the current module state
* @debugfs: debugfs entries for camera protocol operations testing
* @module: Greybus camera module registered to HOST processor.
*/
@ -45,7 +51,9 @@ struct gb_camera {
struct gb_bundle *bundle;
struct gb_connection *connection;
struct gb_connection *data_connection;
struct mutex mutex;
enum gb_camera_state state;
struct {
struct dentry *root;
@ -300,7 +308,6 @@ static int gb_camera_configure_streams(struct gb_camera *gcam,
{
struct gb_camera_configure_streams_request *req;
struct gb_camera_configure_streams_response *resp;
unsigned int nstreams = *num_streams;
unsigned int i;
size_t req_size;
@ -385,6 +392,11 @@ static int gb_camera_configure_streams(struct gb_camera *gcam,
goto done;
}
if (gcam->state == GB_CAMERA_STATE_CONFIGURED) {
gb_camera_teardown_data_connection(gcam);
gcam->state = GB_CAMERA_STATE_UNCONFIGURED;
}
if (resp->num_streams) {
ret = gb_camera_setup_data_connection(gcam, resp, csi_params);
if (ret < 0) {
@ -394,8 +406,8 @@ static int gb_camera_configure_streams(struct gb_camera *gcam,
req, req_size, resp, resp_size);
goto done;
}
} else {
gb_camera_teardown_data_connection(gcam);
gcam->state = GB_CAMERA_STATE_CONFIGURED;
}
*flags = resp->flags;
@ -1039,9 +1051,11 @@ static int gb_camera_probe(struct gb_bundle *bundle,
if (!gcam)
return -ENOMEM;
gcam->bundle = bundle;
mutex_init(&gcam->mutex);
gcam->bundle = bundle;
gcam->state = GB_CAMERA_STATE_UNCONFIGURED;
conn = gb_connection_create(bundle, mgmt_cport_id,
gb_camera_request_handler);
if (IS_ERR(conn)) {