drm: Update generic, ttm and radeon code to Linux 4.9

* Generally cleanup non driver-specific code and increase its
robustness

* DisplayPort support improvements

* Atomic modesetting improvement

drm: Update generic, ttm and radeon code to Linux 4.9

* Generally cleanup non driver-specific code and increase its
robustness

* DisplayPort support improvements

* Atomic modesetting improvements

* Radeon performance and stability improvements

* drm/i915 stays based on Linux 4.7.10 with Linux 4.19 changes
for now

Reviewed-by: Romick

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drm cleanup 09/x: Move EREMOTEIO to linux/errno.h

Technically <linux/errno.h> should be included in:
radeon/atombios_dp.c and i915/intel_dp.c

drm/i915: Update to Linux 4.2

* Work in progress atomic modesetting support

* Broadwell support improvements

* Skylake support improvements, including runtime power management.
Starting from Lin

drm/i915: Update to Linux 4.2

* Work in progress atomic modesetting support

* Broadwell support improvements

* Skylake support improvements, including runtime power management.
Starting from Linux 4.2, a separate firmware blob is required to save
and restore the state of display engines in some low-power modes. These
low-power modes have been forcibly disabled in the DragonFly version of
this driver in order to keep it blob-free.

* Basic Broxton (BXT) support

* Various Displayport improvements including optimized link training,
increased robustness, and automated support for compliance testing

* Execlist overhead reduced

* Frequency boost tuning

* Plenty of bugfixes all around

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drm/linux: define ETIME

drm/i915: Update to Linux 3.14

Changes specific to the DragonFly driver:

* Most GEM code paths are now similar to Linux, leading to increased
stability and performance.
Making this change was g

drm/i915: Update to Linux 3.14

Changes specific to the DragonFly driver:

* Most GEM code paths are now similar to Linux, leading to increased
stability and performance.
Making this change was greatly helped by studying the OpenBSD code.

* We were previously using legacy functions to set up page table entries and
this was starting to become a serious problem on particular platforms such
as gen4 or Broadwell. As of this commit, we now use the same chip-specific
virtual functions as Linux.

* RC6 and Frame Buffer Compression power savings enabled by default, depending
on the GPU family

Changes brought by the Linux 3.11 => 3.14 driver update:

* Various bug fixes on all GPU generations, especially stability improvements

* Power consumption improvements

* Many Valleyview/Baytrail support improvements

* The giant 128MB L4 cache is now enabled when present on Haswell

* Added support for Broadwell GPUs

* HDMI 4K support

* basic support for 3D/stereo displays on HDMI

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drm: Add definitions of ECHRNG and ENOTSUPP

drm: Use the ERESTARTSYS error code

* Linux kernel functions can return -ERESTARTSYS in some cases, a
negative value indicating an error (typically -512)

* Howewer, ERESTARTSYS was previously as

drm: Use the ERESTARTSYS error code

* Linux kernel functions can return -ERESTARTSYS in some cases, a
negative value indicating an error (typically -512)

* Howewer, ERESTARTSYS was previously as ERESTART, itself defined
as -1 in *BSD kernels

* The -ERESTARTSYS return value thus was positive on the DragonFly
kernel, potentially breaking various drm error checks.

* Fix this issue by defining ERESTARTSYS separately

Thanks-to: Imre Vadasz for discovering the original problem

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