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| author | Mike Leach <mike.leach@linaro.org> | 2020-05-18 21:02:33 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-05-19 17:31:17 +0300 |
| commit | ae2041510d5d5fc4f06109559ff40882955b24db (patch) | |
| tree | b6a72199fc7f69627670ba533972dc12bb0581cb /drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | |
| parent | 347adb0d6385c3220dc01ab61807a5b1892901cc (diff) | |
| download | linux-ae2041510d5d5fc4f06109559ff40882955b24db.tar.xz | |
coresight: etmv4: Update default filter and initialisation
Differing default states set on driver init / perf init and as a result
of a sysfs reset.
The ETMv4 can be programmed to trace the entire instruction address range
without the need to use address comparator filter resources.
(Described in the ETMv4.x technical reference manual)
sysfs reset was using this method, perf and default driver init were setup
with an address range comparator for the entire address range.
The perf / driver init has been altered to use the method without needing
any comparator address hardware.
Minor adjustment to the vinst_ctrl register initialisation to ensure
correct zero initialisation.
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200518180242.7916-15-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing/coresight/coresight-etm4x-sysfs.c')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-sysfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c index ce41482431f9..b673e738bc9a 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-etm4x-sysfs.c @@ -205,7 +205,7 @@ static ssize_t reset_store(struct device *dev, * started state. ARM recommends start-stop logic is set before * each trace run. */ - config->vinst_ctrl |= BIT(0); + config->vinst_ctrl = BIT(0); if (drvdata->nr_addr_cmp == true) { config->mode |= ETM_MODE_VIEWINST_STARTSTOP; /* SSSTATUS, bit[9] */ |