linux-kernel - [PATCH AUTOSEL 5.4 35/74] drm/amd/display: Update scaling settings on modeset

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Date:   Tue,  6 Jul 2021 07:24:23 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Roman Li <roman.li@....com>,
        Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>,
        Stylon Wang <stylon.wang@....com>,
        Daniel Wheeler <daniel.wheeler@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.4 35/74] drm/amd/display: Update scaling settings on modeset

From: Roman Li <roman.li@....com>

[ Upstream commit c521fc316d12fb9ea7b7680e301d673bceda922e ]

[Why]
We update scaling settings when scaling mode has been changed.
However when changing mode from native resolution the scaling mode previously
set gets ignored.

[How]
Perform scaling settings update on modeset.

Signed-off-by: Roman Li <roman.li@....com>
Reviewed-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@....com>
Acked-by: Stylon Wang <stylon.wang@....com>
Tested-by: Daniel Wheeler <daniel.wheeler@....com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index 6e31e899192c..fca466d4806b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -6832,7 +6832,8 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
 	BUG_ON(dm_new_crtc_state->stream == NULL);
 
 	/* Scaling or underscan settings */
-	if (is_scaling_state_different(dm_old_conn_state, dm_new_conn_state))
+	if (is_scaling_state_different(dm_old_conn_state, dm_new_conn_state) ||
+				drm_atomic_crtc_needs_modeset(new_crtc_state))
 		update_stream_scaling_settings(
 			&new_crtc_state->mode, dm_new_conn_state, dm_new_crtc_state->stream);
 
-- 
2.30.2