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Sefa Eyeoglu 7df4ceb60f drm/amd/display: check fb of primary plane
Sometimes the primary plane might not be initialized (yet), which
causes dm_check_crtc_cursor to divide by zero.
Apparently a weird state before a S3-suspend causes the aforementioned
divide-by-zero error when resuming from S3.  This was explained in
bug 212293 on Bugzilla.

To avoid this divide-by-zero error we check if the primary plane's fb
isn't NULL.  If it's NULL the src_w and src_h attributes will be 0,
which would cause a divide-by-zero.

This fixes Bugzilla report 212293
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=212293

Fixes: 12f4849a1c ("drm/amd/display: check cursor scaling")
Reviewed-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2021-04-09 16:44:40 -04:00
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Documentation Mediatek DRM Next for Linux 5.13 2021-04-08 12:42:14 +10:00
drivers drm/amd/display: check fb of primary plane 2021-04-09 16:44:40 -04:00
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include drm-misc-next for 5.13: 2021-04-10 05:46:35 +10:00
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MAINTAINERS Mediatek DRM Next for Linux 5.13 2021-04-08 12:42:14 +10:00
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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.