tag d05aa8d5686c6e33eab12d3bb76358df3e4e02f6
tagger Alexander Shishkin <alexander.shishkin@linux.intel.com> Thu Jun 27 15:31:18 2019 +0300
object 4fe4659624b7cf6fa7c2197eb5588f1be1123e17

intel_th: Updates for v5.3

These are:
  * Support for software trace sinks / buffer drivers
  * Various reworks in buffer management code

commit 4fe4659624b7cf6fa7c2197eb5588f1be1123e17
author Alexander Shishkin <alexander.shishkin@linux.intel.com> Fri Jan 04 16:11:38 2019 +0200
committer Alexander Shishkin <alexander.shishkin@linux.intel.com> Thu Jun 27 15:21:25 2019 +0300
tree 16549b3e3b4a734827689ad159fb934e06f9b83a
parent b43b7c778ecb0419444973aa4dcae9622a60cd0d

intel_th: msu: Preserve pre-existing buffer configuration

The MSU configuration registers may contain buffer address/size set by
the BIOS or an external hardware debugger, which may want to take over
tracing from the driver when the driver is not actively tracing.

Preserve these settings when not actively tracing.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>