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@linaro.org Reviewed-by: Mike Leach mike.leach@linaro.org Signed-off-by: Leo Yan leo.yan@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);