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intel_th: Wait until port is in reset before programming it

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[ Upstream commit ab1afed701d2db7eb35c1a2526a29067a38e93d1 ]

Some devices don't drain their pipelines if we don't make sure that
the corresponding output port is in reset before programming it for
a new trace capture, resulting in bits of old trace appearing in the
new trace capture. Fix that by explicitly making sure the reset is
asserted before programming new trace capture.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Link: https://lore.kernel.org/r/20210621151246.31891-5-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexander Shishkin
2021-06-21 18:12:46 +03:00
committed by Greg Kroah-Hartman
parent 45f1de1fff
commit 9c6c657047
3 changed files with 36 additions and 0 deletions
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16
drivers/hwtracing/intel_th/gth.c
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@@ -564,6 +564,21 @@ static void gth_tscu_resync(struct gth_device *gth)
iowrite32(reg, gth->base + REG_TSCU_TSUCTRL);
}
static void intel_th_gth_prepare(struct intel_th_device *thdev,
struct intel_th_output *output)
{
struct gth_device *gth = dev_get_drvdata(&thdev->dev);
int count;
/*
* Wait until the output port is in reset before we start
* programming it.
*/
for (count = GTH_PLE_WAITLOOP_DEPTH;
count && !(gth_output_get(gth, output->port) & BIT(5)); count--)
cpu_relax();
}
/**
* intel_th_gth_enable() - enable tracing to an output device
* @thdev: GTH device
@@ -815,6 +830,7 @@ static struct intel_th_driver intel_th_gth_driver = {
.assign = intel_th_gth_assign,
.unassign = intel_th_gth_unassign,
.set_output = intel_th_gth_set_output,
.prepare = intel_th_gth_prepare,
.enable = intel_th_gth_enable,
.trig_switch = intel_th_gth_switch,
.disable = intel_th_gth_disable,