diff options
| author | Mathieu Poirier <mathieu.poirier@linaro.org> | 2016-05-03 11:34:00 -0600 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-03 14:59:30 -0700 |
| commit | dc2c4ef141c5c14cb8d968ba16c74b4f3c373e2c (patch) | |
| tree | eb3bf01e1441345ecdbf101b4197a6fd596687cc /drivers/hwtracing/coresight | |
| parent | 2e499bbc1a929ac87dcb9832d11000fc055f8bc6 (diff) | |
| download | linux-dc2c4ef141c5c14cb8d968ba16c74b4f3c373e2c.tar.bz2 | |
coresight: configuring ETF in FIFO mode when acting as link
When part of a path but not identified as a sink, the EFT has to
be configured as a link and placed in HW FIFO mode. As such when
enabling a path, call the right configuration function based on
the role the ETF if playing in this trace run.
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight.c | 32 |
1 files changed, 28 insertions, 4 deletions
diff --git a/drivers/hwtracing/coresight/coresight.c b/drivers/hwtracing/coresight/coresight.c index 0995df8f85bc..5443d03a1eec 100644 --- a/drivers/hwtracing/coresight/coresight.c +++ b/drivers/hwtracing/coresight/coresight.c @@ -265,15 +265,27 @@ static void coresight_disable_source(struct coresight_device *csdev) void coresight_disable_path(struct list_head *path) { + u32 type; struct coresight_node *nd; struct coresight_device *csdev, *parent, *child; list_for_each_entry(nd, path, link) { csdev = nd->csdev; + type = csdev->type; - switch (csdev->type) { + /* + * ETF devices are tricky... They can be a link or a sink, + * depending on how they are configured. If an ETF has been + * "activated" it will be configured as a sink, otherwise + * go ahead with the link configuration. + */ + if (type == CORESIGHT_DEV_TYPE_LINKSINK) + type = (csdev == coresight_get_sink(path)) ? + CORESIGHT_DEV_TYPE_SINK : + CORESIGHT_DEV_TYPE_LINK; + + switch (type) { case CORESIGHT_DEV_TYPE_SINK: - case CORESIGHT_DEV_TYPE_LINKSINK: coresight_disable_sink(csdev); break; case CORESIGHT_DEV_TYPE_SOURCE: @@ -294,15 +306,27 @@ int coresight_enable_path(struct list_head *path, u32 mode) { int ret = 0; + u32 type; struct coresight_node *nd; struct coresight_device *csdev, *parent, *child; list_for_each_entry_reverse(nd, path, link) { csdev = nd->csdev; + type = csdev->type; + + /* + * ETF devices are tricky... They can be a link or a sink, + * depending on how they are configured. If an ETF has been + * "activated" it will be configured as a sink, otherwise + * go ahead with the link configuration. + */ + if (type == CORESIGHT_DEV_TYPE_LINKSINK) + type = (csdev == coresight_get_sink(path)) ? + CORESIGHT_DEV_TYPE_SINK : + CORESIGHT_DEV_TYPE_LINK; - switch (csdev->type) { + switch (type) { case CORESIGHT_DEV_TYPE_SINK: - case CORESIGHT_DEV_TYPE_LINKSINK: ret = coresight_enable_sink(csdev, mode); if (ret) goto err; |