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coresight: Fix disabling of CoreSight TPIU

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The CoreSight TPIU should be disabled when tracing to other sinks to allow
them to operate at full bandwidth.

This patch fixes tpiu_disable_hw() to correctly disable the TPIU by
configuring the TPIU to stop on flush, initiating a manual flush, waiting
for the flush to complete and then waits for the TPIU to indicate it has
stopped.

Signed-off-by: Robert Walker <robert.walker@arm.com>
Tested-by: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Robert Walker 2017-12-18 11:05:44 -07:00 committed by Greg Kroah-Hartman
parent 3703221944
commit 11595db8e1
1 changed files with 10 additions and 3 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

13
drivers/hwtracing/coresight/coresight-tpiu.c
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@ -46,8 +46,11 @@
#define TPIU_ITATBCTR0 0xef8
/** register definition **/
/* FFSR - 0x300 */
#define FFSR_FT_STOPPED BIT(1)
/* FFCR - 0x304 */
#define FFCR_FON_MAN BIT(6)
#define FFCR_STOP_FI BIT(12)
/**
* @base: memory mapped base address for this component.
@ -85,10 +88,14 @@ static void tpiu_disable_hw(struct tpiu_drvdata *drvdata)
{
CS_UNLOCK(drvdata->base);
/* Clear formatter controle reg. */
writel_relaxed(0x0, drvdata->base + TPIU_FFCR);
/* Clear formatter and stop on flush */
writel_relaxed(FFCR_STOP_FI, drvdata->base + TPIU_FFCR);
/* Generate manual flush */
writel_relaxed(FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
writel_relaxed(FFCR_STOP_FI | FFCR_FON_MAN, drvdata->base + TPIU_FFCR);
/* Wait for flush to complete */
coresight_timeout(drvdata->base, TPIU_FFCR, FFCR_FON_MAN, 0);
/* Wait for formatter to stop */
coresight_timeout(drvdata->base, TPIU_FFSR, FFSR_FT_STOPPED, 1);
CS_LOCK(drvdata->base);
}