[PATCH 2/3] coresight: etm4x: Fix enabling of cycle accurate tracing in perf.

[Mathieu Poirier]

From: Mike Leach <mike.le...@linaro.org>

Using perf record 'cyclacc' option in cs_etm event was not setting up cycle
accurate trace correctly.

Corrects bit set in TRCCONFIGR to enable cycle accurate trace.
Programs TRCCCCTLR with a valid threshold value as required by ETMv4 spec.

Signed-off-by: Mike Leach <mike.le...@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 7 +++++--
 drivers/hwtracing/coresight/coresight-etm4x.h | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c 
b/drivers/hwtracing/coresight/coresight-etm4x.c
index 031480f2c34d..f432febdda49 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -216,8 +216,11 @@ static int etm4_parse_event_config(struct etmv4_drvdata 
*drvdata,
                goto out;
 
        /* Go from generic option to ETMv4 specifics */
-       if (attr->config & BIT(ETM_OPT_CYCACC))
-               config->cfg |= ETMv4_MODE_CYCACC;
+       if (attr->config & BIT(ETM_OPT_CYCACC)) {
+               config->cfg |= BIT(4);
+               /* TRM: Must program this for cycacc to work */
+               config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
+       }
        if (attr->config & BIT(ETM_OPT_TS))
                config->cfg |= ETMv4_MODE_TIMESTAMP;
 
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.h 
b/drivers/hwtracing/coresight/coresight-etm4x.h
index ba8d3f86de21..b3b5ea7b7fb3 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.h
+++ b/drivers/hwtracing/coresight/coresight-etm4x.h
@@ -146,6 +146,7 @@
 #define ETM_ARCH_V4                    0x40
 #define ETMv4_SYNC_MASK                        0x1F
 #define ETM_CYC_THRESHOLD_MASK         0xFFF
+#define ETM_CYC_THRESHOLD_DEFAULT       0x100
 #define ETMv4_EVENT_MASK               0xFF
 #define ETM_CNTR_MAX_VAL               0xFFFF
 #define ETM_TRACEID_MASK               0x3f
-- 
2.7.4