[PATCH v3 2/2] coresight: etm4x: Refactor returning TS field

[Leo Yan]

As TS == 0b00 is a valid value, this commit updates to return the value
directly instead of converting it to -1.

Currently, only the virtual timestamp (0b01) is used, and other modes
are not enabled. Therefore, this change is safe for user space tools.

Signed-off-by: Leo Yan <leo.yan at arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 18 +++---------------
 1 file changed, 3 insertions(+), 15 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
index 8afcc553bb97..653cb4ce17cf 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c
@@ -2315,23 +2315,11 @@ static ssize_t ts_source_show(struct device *dev,
 	int val;
 	struct etmv4_drvdata *drvdata = dev_get_drvdata(dev->parent);
 
-	if (!has_feat_trf(drvdata)) {
+	if (!has_feat_trf(drvdata))
 		val = -1;
-		goto out;
-	}
-
-	val = FIELD_GET(TRFCR_EL1_TS_MASK, drvdata->trfcr);
-	switch (val) {
-	case TRFCR_EL1_TS_VIRTUAL:
-	case TRFCR_EL1_TS_GUEST_PHYSICAL:
-	case TRFCR_EL1_TS_PHYSICAL:
-		break;
-	default:
-		val = -1;
-		break;
-	}
+	else
+		val = FIELD_GET(TRFCR_EL1_TS_MASK, drvdata->trfcr);
 
-out:
 	return sysfs_emit(buf, "%d\n", val);
 }
 static DEVICE_ATTR_RO(ts_source);
-- 
2.34.1