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drm/amd/display: Add below the range support for FreeSync

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[Why]
When the flip-rate is below the minimum supported variable refresh rate
range for the monitor the front porch wait will timeout and be
frequently misaligned resulting in stuttering and/or flickering.

The FreeSync module can still maintain a smooth and flicker free
image when the monitor has a refresh rate range such that the maximum
refresh > 2 * minimum refresh by utilizing low framerate compensation,
"below the range".

[How]
Hook up the pre-flip and post-flip handlers from the FreeSync module.
These adjust the minimum/maximum vrr range to duplicate frames
when appropriate by tracking flip timestamps.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Leo Li <sunpeng.li@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
2018-12-05 12:08:56 -05:00
committed by Alex Deucher
parent 8cd61c313d
commit 180db303ff
2 changed files with 63 additions and 19 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
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@@ -268,7 +268,7 @@ struct dm_crtc_state {
bool vrr_supported;
struct mod_freesync_config freesync_config;
struct dc_crtc_timing_adjust adjust;
struct mod_vrr_params vrr_params;
struct dc_info_packet vrr_infopacket;
int abm_level;