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| author | Alexander Shishkin <alexander.shishkin@linux.intel.com> | 2019-10-28 09:06:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-04 15:01:22 +0100 |
| commit | 87c0b9c79ec136ea76a14a88d675a746bc6a87f9 (patch) | |
| tree | 61ab9c470c3328b48dd2317e95c48f2106a381f5 /drivers/hwtracing | |
| parent | 106901add52b6e79206c15563fcc0efe835f75bb (diff) | |
| download | linux-87c0b9c79ec136ea76a14a88d675a746bc6a87f9.tar.bz2 | |
intel_th: gth: Fix the window switching sequence
Commit 8116db57cf16 ("intel_th: Add switch triggering support") added
a trigger assertion of the CTS, but forgot to de-assert it at the end
of the sequence. This results in window switches randomly not happening.
Fix that by de-asserting the trigger at the end of the window switch
sequence.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Fixes: 8116db57cf16 ("intel_th: Add switch triggering support")
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191028070651.9770-2-alexander.shishkin@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/intel_th/gth.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c index fa9d34af87ac..f72803a02391 100644 --- a/drivers/hwtracing/intel_th/gth.c +++ b/drivers/hwtracing/intel_th/gth.c @@ -626,6 +626,9 @@ static void intel_th_gth_switch(struct intel_th_device *thdev, if (!count) dev_dbg(&thdev->dev, "timeout waiting for CTS Trigger\n"); + /* De-assert the trigger */ + iowrite32(0, gth->base + REG_CTS_CTL); + intel_th_gth_stop(gth, output, false); intel_th_gth_start(gth, output); } |