openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

coresight: catu: Claim device before use 

Use the CLAIM protocol to grab the ownership of the component when
in use.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-09-20 13:18:14 -06:00 committed by Greg Kroah-Hartman
parent f13d7c0835
commit f92201b1ab
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/hwtracing/coresight/coresight-catu.c
View File

@ -406,6 +406,7 @@ static inline int catu_wait_for_ready(struct catu_drvdata *drvdata)
static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
{
int rc;
u32 control, mode;
struct etr_buf *etr_buf = data;
@ -418,6 +419,10 @@ static int catu_enable_hw(struct catu_drvdata *drvdata, void *data)
return -EBUSY;
}
rc = coresight_claim_device_unlocked(drvdata->base);
if (rc)
return rc;
control |= BIT(CATU_CONTROL_ENABLE);
if (etr_buf && etr_buf->mode == ETR_MODE_CATU) {
@ -459,6 +464,7 @@ static int catu_disable_hw(struct catu_drvdata *drvdata)
int rc = 0;
catu_write_control(drvdata, 0);
coresight_disclaim_device_unlocked(drvdata->base);
if (catu_wait_for_ready(drvdata)) {
dev_info(drvdata->dev, "Timeout while waiting for READY\n");
rc = -EAGAIN;