Commit graph

7 commits

Author SHA1 Message Date
Greg Kroah-Hartman 80f7631963 intel_th: Fixes -stable
These are:
  * a fix for a modprobe time deadlock
  * a new PCI ID for Kaby Lake PCH-H
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iF4EABEIAAYFAleHZqwACgkQ68X2JGMFV/9W/gEArIrWWs+j6rVdEiill64T82PM
 ErwKaVDHgYTQGNX9EHQA/Rfg4+zHlGu1OZhZDtt5u6lxayLHFhKyvCXhmbvVcYdf
 =ah6j
 -----END PGP SIGNATURE-----

Merge tag 'stm-for-greg-20160714' of git://git.kernel.org/pub/scm/linux/kernel/git/ash/stm into char-misc-next

Alexander writes:

intel_th: Fixes -t://git.kernel.org/pub/scm/linux/kernel/git/ash/stm.git
tags/stm-for-greg-20160714
stable

These are:
 * a fix for a modprobe time deadlock
 * a new PCI ID for Kaby Lake PCH-H
2016-07-15 14:19:11 +09:00
Alexander Shishkin a36aa80f3c intel_th: Fix a deadlock in modprobing
Driver initialization tries to request a hub (GTH) driver module from
its probe callback, resulting in a deadlock.

This patch solves the problem by adding a deferred work for requesting
the hub module.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: <stable@vger.kernel.org> # 4.4.x-
2016-07-14 13:02:39 +03:00
Alexander Shishkin bd581f239f intel_th: Document output device callbacks
'output' type device callbacks are missing from the kerneldoc description
of the 'intel_th_driver' structure. Fix this.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
2016-07-01 11:01:13 +03:00
Alexander Shishkin f18a9531f6 intel_th: Fix activating a subdevice without a driver
If output subdevice driver is not loaded, activating it will try to
call its ->activate method and crash. Fix this by explicitly checking
for the driver.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08 16:11:58 +03:00
Alexander Shishkin b5edbf1ea3 intel_th: Allow subdevice drivers to bring in own attribute groups
Some subdevices (MSU, PTI) need to register their own driver-specific
attribute groups. Provide a way for those to pass their attribute
groups to the core driver in their driver structure so that the
core can take care of creating and removing them.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Reviewed-by: Laurent Fert <laurent.fert@intel.com>
2016-04-08 16:11:56 +03:00
Alexander Shishkin 4d02ceff32 intel_th: Update scratchpad bits according to enabled output activity
Intel TH implements a scratchpad register to indicate to the firmware
and external debuggers what trace configuration is enabled so that
everybody plays nicely together. The register is a bit field and the
bit assignment convention is described in the developer's manual.

This patch enables the driver to automatically set scratchpad register
bits according to the output configuration that's enabled.

Based on work by Yann Fouassier.

Signed-off-by: Yann Fouassier <yann.fouassier@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2016-02-20 14:09:14 -08:00
Alexander Shishkin 39f4034693 intel_th: Add driver infrastructure for Intel(R) Trace Hub devices
Intel(R) Trace Hub (TH) is a set of hardware blocks (subdevices) that
produce, switch and output trace data from multiple hardware and
software sources over several types of trace output ports encoded
in System Trace Protocol (MIPI STPv2) and is intended to perform
full system debugging.

For these subdevices, we create a bus, where they can be discovered
and configured by userspace software.

This patch creates this bus infrastructure, three types of devices
(source, output, switch), resource allocation, some callback mechanisms
to facilitate communication between the subdevices' drivers and some
common sysfs attributes.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2015-10-04 20:28:58 +01:00