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coresight: tmc-etr: Do not clean trace buffer 

We zero out the entire trace buffer used for ETR before it is enabled,
for helping with debugging. With the addition of scatter-gather mode,
the buffer could be bigger and non-contiguous.

Get rid of this step; if someone wants to debug, they can always add it
as and when needed.

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Suzuki K Poulose 2018-07-11 13:40:16 -06:00 committed by Greg Kroah-Hartman
parent 3495722a00
commit 0f728a7f9f
1 changed files with 2 additions and 6 deletions
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8
drivers/hwtracing/coresight/coresight-tmc-etr.c
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@ -13,9 +13,6 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
{
u32 axictl, sts;
/* Zero out the memory to help with debug */
memset(drvdata->vaddr, 0, drvdata->size);
CS_UNLOCK(drvdata->base);
/* Wait for TMCSReady bit to be set */
@ -340,9 +337,8 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
if (drvdata->mode == CS_MODE_SYSFS) {
/*
* The trace run will continue with the same allocated trace
* buffer. The trace buffer is cleared in tmc_etr_enable_hw(),
* so we don't have to explicitly clear it. Also, since the
* tracer is still enabled drvdata::buf can't be NULL.
* buffer. Since the tracer is still enabled drvdata::buf can't
* be NULL.
*/
tmc_etr_enable_hw(drvdata);
} else {