linux-kernel - [PATCH 5.13 036/151] drm/amdgpu: Add preferred mode in modeset when freesync video modes enabled.

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Date:   Mon, 16 Aug 2021 15:01:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Solomon Chiu <solomon.chiu@....com>,
        Alex Deucher <alexander.deucher@....com>
Subject: [PATCH 5.13 036/151] drm/amdgpu: Add preferred mode in modeset when freesync video modes enabled.

From: Solomon Chiu <solomon.chiu@....com>

commit 46dd2965bdd1c5a4f6499c73ff32e636fa8f9769 upstream.

[Why]
With kernel module parameter "freesync_video" is enabled, if the mode
is changed to preferred mode(the mode with highest rate), then Freesync
fails because the preferred mode is treated as one of freesync video
mode, and then be configurated as freesync video mode(fixed refresh
rate).

[How]
Skip freesync fixed rate configurating when modeset to preferred mode.

Signed-off-by: Solomon Chiu <solomon.chiu@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9410,7 +9410,12 @@ static int dm_update_crtc_state(struct a
 		} else if (amdgpu_freesync_vid_mode && aconnector &&
 			   is_freesync_video_mode(&new_crtc_state->mode,
 						  aconnector)) {
-			set_freesync_fixed_config(dm_new_crtc_state);
+			struct drm_display_mode *high_mode;
+
+			high_mode = get_highest_refresh_rate_mode(aconnector, false);
+			if (!drm_mode_equal(&new_crtc_state->mode, high_mode)) {
+				set_freesync_fixed_config(dm_new_crtc_state);
+			}
 		}
 
 		ret = dm_atomic_get_state(state, &dm_state);