[PATCH v6 10/11] coresight: etm4x: Retain sequencer state

[Leo Yan]

Retain sequencer state in the disable flow and will be restored in the
enable flow.

As a result, the flow will be reused by CPU suspend and resume in
sequential change.

Tested-by: James Clark <james.clark at linaro.org>
Signed-off-by: Leo Yan <leo.yan at arm.com>
---
 drivers/hwtracing/coresight/coresight-etm4x-core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index 8b85a73e29f407a8d5e26a25f4dceaadaeed05ed..afee54ac0aec0c0e521fa1885a95f48555a369de 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -1034,6 +1034,10 @@ static void etm4_disable_hw(struct etmv4_drvdata *drvdata)
 			etm4x_relaxed_read32(csa, TRCCNTVRn(i));
 	}
 
+	/* read back the sequencer state */
+	if (drvdata->nrseqstate)
+		config->seq_state = etm4x_relaxed_read32(csa, TRCSEQSTR);
+
 	coresight_disclaim_device_unlocked(csdev);
 	etm4_cs_lock(drvdata, csa);
 

-- 
2.34.1