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drm: Add vrr_enabled property to drm CRTC

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This patch introduces the 'vrr_enabled' CRTC property to allow
dynamic control over variable refresh rate support for a CRTC.

This property should be treated like a content hint to the driver -
if the hardware or driver is not capable of driving variable refresh
timings then this is not considered an error.

Capability for variable refresh rate support should be determined
by querying the vrr_capable drm connector property.

It is worth noting that while the property is intended for atomic use
it isn't filtered from legacy userspace queries. This allows for Xorg
userspace drivers to implement support.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas
2018-10-04 11:46:07 -04:00
committed by Alex Deucher
parent ba1b0f6c73
commit 1398958cfd
5 changed files with 26 additions and 0 deletions
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9
include/drm/drm_crtc.h
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@@ -290,6 +290,15 @@ struct drm_crtc_state {
*/
u32 pageflip_flags;
/**
* @vrr_enabled:
*
* Indicates if variable refresh rate should be enabled for the CRTC.
* Support for the requested vrr state will depend on driver and
* hardware capabiltiy - lacking support is not treated as failure.
*/
bool vrr_enabled;
/**
* @event:
*