Commit 0ab925d3 authored Mar 21, 2019 by Nicholas Kazlauskas Committed by Alex Deucher Mar 21, 2019

drm/amd/display: Only allow VRR when vrefresh is within supported range



[Why]
Black screens or artifacting can occur when enabling FreeSync outside
of the supported range of the monitor. This can happen since the
supported range isn't always the min/max vrefresh range available for
the monitor.

[How]
There was previously a fix that prevented this from happening in the
low range but it didn't cover the upper range. Expand the condition
to include both.

Cc: Sun peng Li <Sunpeng.Li@amd.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 72464382

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -5429,9 +5429,11 @@ static void get_freesync_config_for_crtc(
		struct amdgpu_dm_connector *aconnector =
		to_amdgpu_dm_connector(new_con_state->base.connector);
		struct drm_display_mode *mode = &new_crtc_state->base.mode;
		int vrefresh = drm_mode_vrefresh(mode);

		new_crtc_state->vrr_supported = new_con_state->freesync_capable &&
		aconnector->min_vfreq <= drm_mode_vrefresh(mode);
		vrefresh >= aconnector->min_vfreq &&
		vrefresh <= aconnector->max_vfreq;

		if (new_crtc_state->vrr_supported) {
		new_crtc_state->stream->ignore_msa_timing_param = true;

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