linux-kernel - [PATCH v3 21/44] drm/nouveau/disp: release outputs post-modeset

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Date:   Tue, 19 Sep 2023 17:56:16 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org, nouveau@...ts.freedesktop.org
Cc:     Ben Skeggs <bskeggs@...hat.com>, Danilo Krummrich <me@...r.org>,
        Karol Herbst <kherbst@...hat.com>,
        David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, Wayne Lin <Wayne.Lin@....com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v3 21/44] drm/nouveau/disp: release outputs post-modeset

From: Ben Skeggs <bskeggs@...hat.com>

Prior to this commit, KMS would call release() prior to modeset, and the
second supervisor interrupt would update SOR routing if needed.

Now, KMS will call release() post-modeset and update routing immediately.

- preparation for GSP-RM

Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
Reviewed-by: Lyude Paul <lyude@...hat.com>
Acked-by: Danilo Krummrich <me@...r.org>
Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 drivers/gpu/drm/nouveau/dispnv50/disp.c        | 18 ++++++++----------
 .../gpu/drm/nouveau/nvkm/engine/disp/outp.c    |  1 +
 .../gpu/drm/nouveau/nvkm/engine/disp/uoutp.c   |  2 ++
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index ab048cf25d866..50a0ff304291e 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -477,7 +477,6 @@ nv50_dac_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *st
 
 	core->func->dac->ctrl(core, nv_encoder->outp.or.id, ctrl, NULL);
 	nv_encoder->crtc = NULL;
-	nvif_outp_release(&nv_encoder->outp);
 }
 
 static void
@@ -1300,6 +1299,11 @@ nv50_mstm_cleanup(struct drm_atomic_state *state,
 		}
 	}
 
+	if (mstm->disabled) {
+		nvif_outp_release(&mstm->outp->outp);
+		mstm->disabled = false;
+	}
+
 	mstm->modified = false;
 }
 
@@ -1334,12 +1338,6 @@ nv50_mstm_prepare(struct drm_atomic_state *state,
 				nv50_msto_prepare(state, mst_state, &mstm->mgr, msto);
 		}
 	}
-
-	if (mstm->disabled) {
-		if (!mstm->links)
-			nvif_outp_release(&mstm->outp->outp);
-		mstm->disabled = false;
-	}
 }
 
 static struct drm_connector *
@@ -1582,7 +1580,6 @@ nv50_sor_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *st
 
 	nv_encoder->update(nv_encoder, nv_crtc->index, NULL, 0, 0);
 	nv50_audio_disable(encoder, nv_crtc);
-	nvif_outp_release(&nv_encoder->outp);
 	nv_encoder->crtc = NULL;
 }
 
@@ -1827,7 +1824,6 @@ nv50_pior_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *s
 
 	core->func->pior->ctrl(core, nv_encoder->outp.or.id, ctrl, NULL);
 	nv_encoder->crtc = NULL;
-	nvif_outp_release(&nv_encoder->outp);
 }
 
 static void
@@ -1990,8 +1986,10 @@ nv50_disp_atomic_commit_core(struct drm_atomic_state *state, u32 *interlock)
 						  nv_encoder->conn, NULL, NULL);
 				outp->enabled = outp->disabled = false;
 			} else {
-				if (outp->disabled)
+				if (outp->disabled) {
+					nvif_outp_release(&nv_encoder->outp);
 					outp->disabled = false;
+				}
 			}
 		}
 	}
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
index b288ea6658da6..20a013f1bbbac 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/outp.c
@@ -238,6 +238,7 @@ void
 nvkm_outp_release(struct nvkm_outp *outp)
 {
 	nvkm_outp_release_or(outp, NVKM_OUTP_USER);
+	nvkm_outp_route(outp->disp);
 }
 
 void
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
index ffd174091454f..40cbb4ddc0378 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/uoutp.c
@@ -188,6 +188,8 @@ nvkm_uoutp_mthd_release(struct nvkm_outp *outp, void *argv, u32 argc)
 
 	if (argc != sizeof(args->vn))
 		return -ENOSYS;
+	if (!outp->ior)
+		return -EINVAL;
 
 	nvkm_outp_release(outp);
 	return 0;
-- 
2.41.0