[PATCH 11/13] coresight: catu: Claim device before use

Suzuki K Poulose
2018-08-06T13:43:34Z

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>
---
drivers/hwtracing/coresight/coresight-catu.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-catu.c b/drivers/hwtracing/coresight/coresight-catu.c
index ff94e58..170fbb6 100644
--- a/drivers/hwtracing/coresight/coresight-catu.c
+++ b/drivers/hwtracing/coresight/coresight-catu.c
@@ -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;
--
2.7.4