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drm/gud: Enable synchronous flushing by default 

gud has a module parameter that controls whether framebuffer flushing
happens synchronously during the commit or asynchronously in a worker.

GNOME before version 3.38 handled all displays in the same rendering loop.
This lead to gud slowing down the refresh rate for a faster monitor. This
has now been fixed so lets change the default.

The plan is to remove async flushing in the future. The code is now
structured in a way that makes it easy to do this.

Link: https://blogs.gnome.org/shell-dev/2020/07/02/splitting-up-the-frame-clock/
Suggested-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221122-gud-shadow-plane-v2-6-435037990a83@tronnes.org
This commit is contained in:
Noralf Trønnes 2022-11-30 20:26:54 +01:00
parent c17d048609
commit 5ad8e63ebb
1 changed files with 4 additions and 8 deletions
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12
drivers/gpu/drm/gud/gud_pipe.c
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@ -25,17 +25,13 @@
#include "gud_internal.h"
/*
* Some userspace rendering loops runs all displays in the same loop.
* Some userspace rendering loops run all displays in the same loop.
* This means that a fast display will have to wait for a slow one.
* For this reason gud does flushing asynchronous by default.
* The down side is that in e.g. a single display setup userspace thinks
* the display is insanely fast since the driver reports back immediately
* that the flush/pageflip is done. This wastes CPU and power.
* Such users might want to set this module parameter to false.
* Such users might want to enable this module parameter.
*/
static bool gud_async_flush = true;
static bool gud_async_flush;
module_param_named(async_flush, gud_async_flush, bool, 0644);
MODULE_PARM_DESC(async_flush, "Enable asynchronous flushing [default=true]");
MODULE_PARM_DESC(async_flush, "Enable asynchronous flushing [default=0]");
/*
* FIXME: The driver is probably broken on Big Endian machines.