linux-kernel - [PATCH AUTOSEL 5.0 171/262] drm/amd/display: Don't re-program planes for DPMS changes

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Message-Id: <20190327180158.10245-171-sashal@kernel.org>
Date:   Wed, 27 Mar 2019 14:00:26 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 5.0 171/262] drm/amd/display: Don't re-program planes for DPMS changes

From: Nicholas Kazlauskas <nicholas.kazlauskas@....com>

[ Upstream commit 5062b797db4103218fa00ee254417b8ecaab7401 ]

[Why]
There are opt1c lock warnings and CRTC read timeouts when running the
"igt@..._plane@...ne-position-hole-dpms-pipe-*" tests. These are
caused by trying to reprogram planes that are not in the current
context.

DPMS off removes the stream from the context. In this case:

new_crtc_state->active_changed = true
new_crtc_state->mode_changed = false

The planes are reprogrammed before the stream is removed from the
context because stream_state->mode_changed = false.

For DPMS adds the stream and planes back to the context:

new_crtc_state->active_changed = true
new_crtc_state->mode_changed = false

The planes are also reprogrammed here before the stream is added to the
context because stream_state->mode_changed = true. They were not
previously in the current context so warnings occur here.

[How]
Set stream_state->mode_changed = true when
new_crtc_state->active_changed = true too.

This prevents reprogramming before the context is applied in DC. The
programming will be done after the context is applied.

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@....com>
Reviewed-by: Sun peng Li <Sunpeng.Li@....com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>
Acked-by: Tony Cheng <Tony.Cheng@....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 6d77fd966dbd..0040605cace8 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -4975,7 +4975,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 static void amdgpu_dm_crtc_copy_transient_flags(struct drm_crtc_state *crtc_state,
 						struct dc_stream_state *stream_state)
 {
-	stream_state->mode_changed = crtc_state->mode_changed;
+	stream_state->mode_changed =
+		crtc_state->mode_changed || crtc_state->active_changed;
 }

 static int amdgpu_dm_atomic_commit(struct drm_device *dev,
-- 
2.19.1