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Matt Roper 78cc55e0b6 drm/i915/mcr: Hold GT forcewake during steering operations 
The steering control and semaphore registers are inside an "always on"
power domain with respect to RC6.  However there are some issues if
higher-level platform sleep states are entering/exiting at the same time
these registers are accessed.  Grabbing GT forcewake and holding it over
the entire lock/steer/unlock cycle ensures that those sleep states have
been fully exited before we access these registers.

This is expected to become a formally documented/numbered workaround
soon.

Note that this patch alone isn't expected to have an immediately
noticeable impact on MCR (mis)behavior; an upcoming pcode firmware
update will also be necessary to provide the other half of this
workaround.

v2:
 - Move the forcewake inside the Xe_LPG-specific IP version check.  This
   should only be necessary on platforms that have a steering semaphore.

Fixes: 3100240bf8 ("drm/i915/mtl: Add hardware-level lock for steering")
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231019170241.2102037-2-matthew.d.roper@intel.com
(cherry picked from commit 8fa1c7cd1f)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
2023-10-25 08:44:26 -04:00
arch powerpc fixes for 6.6 #5 2023-10-21 18:46:47 -07:00
block
certs
crypto
Documentation phy fixes for 6.6 2023-10-22 07:11:10 -10:00
drivers drm/i915/mcr: Hold GT forcewake during steering operations 2023-10-25 08:44:26 -04:00
fs Bug fixes for 6.6-rc6: 2023-10-21 09:43:09 -07:00
include Fix group event semantics. 2023-10-21 11:09:29 -07:00
init
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kernel Fix a recently introduced use-after-free bug. 2023-10-21 11:19:07 -07:00
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net Including fixes from bluetooth, netfilter, WiFi. 2023-10-19 12:08:18 -07:00
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sound sound fixes for 6.6-rc7 2023-10-20 10:05:10 -07:00
tools Probes fixes for v6.6-rc6.2: 2023-10-21 11:00:36 -07:00
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MAINTAINERS platform-drivers-x86 for v6.6-5 2023-10-21 10:02:46 -07:00
Makefile Linux 6.6-rc7 2023-10-22 12:11:21 -10:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.