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On IGT, there is a test named amd_hotplug, and when the subtest basic is executed on DCN31, we get the following error: [drm] *ERROR* [CRTC:71:crtc-0] flip_done timed out [drm] *ERROR* flip_done timed out [drm] *ERROR* [CRTC:71:crtc-0] commit wait timed out [drm] *ERROR* flip_done timed out [drm] *ERROR* [CONNECTOR:88:DP-1] commit wait timed out [drm] *ERROR* flip_done timed out [drm] *ERROR* [PLANE:59:plane-3] commit wait timed out After enable the page flip log with the below command: echo -n 'format "[PFLIP]" +p' > /sys/kernel/debug/dynamic_debug/control It is possible to see that the flip was submitted, but DC never replied back, which generates time-out issues. This is an indication that the HUBP surface flip is missing. This commit fixes this issue by adding hubp1_set_flip_int to DCN31. Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com> Acked-by: Tom Chung <chiahsuan.chung@amd.com> Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com> Tested-by: Daniel Wheeler <daniel.wheeler@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
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.