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Stanislav Lisovskiy b18e249bf6 drm/i915: Ensure no conflicts with BIOS when updating Dbuf
TGL BIOS seems to enable both DBuf slices ocasionally, depending
how many displays are connected, while i915 according to BSpec
was powering on S1 DBuf slice, until a modeset was done.

This was causing a brief flash during the boot as we were
disabling slice, previously used by BIOS with that.

To prevent this, now we are ensuring tht we are enabling
_at least_ one slice, but if there are more, let's not
power them off.

Fixes: ff2cd8635e ("drm/i915: Correctly map DBUF slices to pipes")
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213140412.32697-2-stanislav.lisovskiy@intel.com
2020-02-15 19:19:38 +02:00
arch Linux 5.5-rc7 2020-01-20 11:42:57 +10:00
block block: fix an integer overflow in logical block size 2020-01-15 21:43:09 -07:00
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Documentation Merge tag 'drm-msm-next-2020-01-14' of https://gitlab.freedesktop.org/drm/msm into drm-next 2020-01-20 14:09:43 +10:00
drivers drm/i915: Ensure no conflicts with BIOS when updating Dbuf 2020-02-15 19:19:38 +02:00
fs io_uring-5.5-2020-01-16 2020-01-17 11:25:45 -08:00
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README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.