linux-kernel - [v1] drm/msm/dpu: Fix reservation failures in modeset

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Date:   Wed,  5 Aug 2020 19:04:06 +0530
From:   Kalyan Thota <kalyan_t@...eaurora.org>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Kalyan Thota <kalyan_t@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        dianders@...omium.org, mkrishn@...eaurora.org,
        travitej@...eaurora.org, nganji@...eaurora.org,
        swboyd@...omium.org, abhinavk@...eaurora.org,
        ddavenport@...omium.org
Subject: [v1] drm/msm/dpu: Fix reservation failures in modeset

In TEST_ONLY commit, rm global_state will duplicate the
object and request for new reservations, once they pass
then the new state will be swapped with the old and will
be available for the Atomic Commit.

This patch fixes some of missing links in the resource
reservation sequence mentioned above.

1) Creation of a duplicate state in test_only commit (Rob)
2) Allow resource release only during crtc_active false.

For #2
In a modeset operation, swap state happens well before disable.
Hence clearing reservations in disable will cause failures
in modeset enable.

Sequence:
    Swap state --> old, new
    modeset disables --> virt disable
    modeset enable --> virt modeset

Allow reservations to be cleared only when crtc active is false
as in that case there wont be any modeset enable after disable.

Signed-off-by: Kalyan Thota <kalyan_t@...eaurora.org>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
index 63976dc..b85a576 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
@@ -582,7 +582,7 @@ static int dpu_encoder_virt_atomic_check(
 	dpu_kms = to_dpu_kms(priv->kms);
 	mode = &crtc_state->mode;
 	adj_mode = &crtc_state->adjusted_mode;
-	global_state = dpu_kms_get_existing_global_state(dpu_kms);
+	global_state = dpu_kms_get_global_state(crtc_state->state);
 	trace_dpu_enc_atomic_check(DRMID(drm_enc));
 
 	/*
@@ -1172,6 +1172,7 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
 	struct msm_drm_private *priv;
 	struct dpu_kms *dpu_kms;
 	struct dpu_global_state *global_state;
+	struct drm_crtc_state *crtc_state;
 	int i = 0;
 
 	if (!drm_enc) {
@@ -1191,6 +1192,7 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
 	priv = drm_enc->dev->dev_private;
 	dpu_kms = to_dpu_kms(priv->kms);
 	global_state = dpu_kms_get_existing_global_state(dpu_kms);
+	crtc_state = drm_enc->crtc->state;
 
 	trace_dpu_enc_disable(DRMID(drm_enc));
 
@@ -1220,7 +1222,8 @@ static void dpu_encoder_virt_disable(struct drm_encoder *drm_enc)
 
 	DPU_DEBUG_ENC(dpu_enc, "encoder disabled\n");
 
-	dpu_rm_release(global_state, drm_enc);
+	if (crtc_state->active_changed && !crtc_state->active)
+		dpu_rm_release(global_state, drm_enc);
 
 	mutex_unlock(&dpu_enc->enc_lock);
 }
-- 
1.9.1