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Subject[PATCH] drm/nouveau/kms/nvd9-: Fix disabling CRCs alongside OR reprogramming
Date
While I had thought I'd tested this before, it looks like this one issue
slipped by my original CRC patches. Basically, there seem to be a few
rules we need to follow when sending CRC commands to the display
controller:

* CRCs cannot be both disabled and enabled for a single head in the same
flush
* If a head with CRC reporting enabled switches from one OR to another,
there must be a flush before the OR is re-enabled regardless of the
final state of CRC reporting.

So, split nv50_crc_atomic_prepare_notifier_contexts() into two
functions:
* nv_crc_atomic_release_notifier_contexts() - checks whether the CRC
notifier contexts were released successfully after the first flush
* nv_crc_atomic_init_notifier_contexts() - prepares any CRC notifier
contexts for use before enabling reporting

Additionally, in order to force a flush when we re-assign ORs with heads
that have CRCs enabled we split our atomic check function into two:

* nv50_crc_atomic_check_head() - called from our heads' atomic checks,
determines whether a state needs to set or clear CRC reporting
* nv50_crc_atomic_check_outp() - called at the end of the atomic check
after all ORs have been added to the atomic state, and sets
nv50_atom->flush_disable if needed

Signed-off-by: Lyude Paul <lyude@redhat.com>
---
drivers/gpu/drm/nouveau/dispnv50/crc.c | 107 ++++++++++++++++--------
drivers/gpu/drm/nouveau/dispnv50/crc.h | 18 ++--
drivers/gpu/drm/nouveau/dispnv50/disp.c | 13 ++-
drivers/gpu/drm/nouveau/dispnv50/head.c | 2 +-
4 files changed, 97 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/crc.c b/drivers/gpu/drm/nouveau/dispnv50/crc.c
index 0b18d9e3a2b96..f17fb6d56757a 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/crc.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/crc.c
@@ -261,7 +261,29 @@ void nv50_crc_atomic_stop_reporting(struct drm_atomic_state *state)
}
}

-void nv50_crc_atomic_prepare_notifier_contexts(struct drm_atomic_state *state)
+void nv50_crc_atomic_init_notifier_contexts(struct drm_atomic_state *state)
+{
+ struct drm_crtc_state *new_crtc_state;
+ struct drm_crtc *crtc;
+ int i;
+
+ for_each_new_crtc_in_state(state, crtc, new_crtc_state, i) {
+ struct nv50_head *head = nv50_head(crtc);
+ struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
+ struct nv50_crc *crc = &head->crc;
+ int i;
+
+ if (!asyh->set.crc)
+ continue;
+
+ crc->entry_idx = 0;
+ crc->ctx_changed = false;
+ for (i = 0; i < ARRAY_SIZE(crc->ctx); i++)
+ nv50_crc_reset_ctx(&crc->ctx[i]);
+ }
+}
+
+void nv50_crc_atomic_release_notifier_contexts(struct drm_atomic_state *state)
{
const struct nv50_crc_func *func =
nv50_disp(state->dev)->core->func->crc;
@@ -274,22 +296,15 @@ void nv50_crc_atomic_prepare_notifier_contexts(struct drm_atomic_state *state)
struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
struct nv50_crc *crc = &head->crc;
struct nv50_crc_notifier_ctx *ctx = &crc->ctx[crc->ctx_idx];
- int i;

- if (asyh->clr.crc && asyh->crc.src) {
- if (crc->ctx_changed) {
- nv50_crc_wait_ctx_finished(head, func, ctx);
- ctx = &crc->ctx[crc->ctx_idx ^ 1];
- }
- nv50_crc_wait_ctx_finished(head, func, ctx);
- }
+ if (!asyh->clr.crc)
+ continue;

- if (asyh->set.crc) {
- crc->entry_idx = 0;
- crc->ctx_changed = false;
- for (i = 0; i < ARRAY_SIZE(crc->ctx); i++)
- nv50_crc_reset_ctx(&crc->ctx[i]);
+ if (crc->ctx_changed) {
+ nv50_crc_wait_ctx_finished(head, func, ctx);
+ ctx = &crc->ctx[crc->ctx_idx ^ 1];
}
+ nv50_crc_wait_ctx_finished(head, func, ctx);
}
}

@@ -325,16 +340,13 @@ void nv50_crc_atomic_start_reporting(struct drm_atomic_state *state)
}
}

-int nv50_crc_atomic_check(struct nv50_head *head,
- struct nv50_head_atom *asyh,
- struct nv50_head_atom *armh)
+int nv50_crc_atomic_check_head(struct nv50_head *head,
+ struct nv50_head_atom *asyh,
+ struct nv50_head_atom *armh)
{
- struct drm_atomic_state *state = asyh->state.state;
+ struct nv50_atom *atom = nv50_atom(asyh->state.state);
struct drm_device *dev = head->base.base.dev;
- struct nv50_atom *atom = nv50_atom(state);
struct nv50_disp *disp = nv50_disp(dev);
- struct drm_encoder *encoder;
- struct nv50_outp_atom *outp_atom;
bool changed = armh->crc.src != asyh->crc.src;

if (!armh->crc.src && !asyh->crc.src) {
@@ -373,27 +385,52 @@ int nv50_crc_atomic_check(struct nv50_head *head,
asyh->set.or |= armh->or.crc_raster !=
asyh->or.crc_raster;

+ if (asyh->clr.crc && asyh->set.crc)
+ atom->flush_disable = true;
+ } else {
+ asyh->set.crc = false;
+ asyh->clr.crc = false;
+ }
+
+ return 0;
+}
+
+void nv50_crc_atomic_check_outp(struct nv50_atom *atom)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *old_crtc_state, *new_crtc_state;
+ int i;
+
+ if (atom->flush_disable)
+ return;
+
+ for_each_oldnew_crtc_in_state(&atom->state, crtc, old_crtc_state,
+ new_crtc_state, i) {
+ struct nv50_head_atom *armh = nv50_head_atom(old_crtc_state);
+ struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
+ struct nv50_outp_atom *outp_atom;
+ struct nouveau_encoder *outp =
+ nv50_real_outp(nv50_head_atom_get_encoder(armh));
+ struct drm_encoder *encoder = &outp->base.base;
+
+ if (!asyh->clr.crc)
+ continue;
+
/*
- * If we're reprogramming our OR, we need to flush the CRC
- * disable first
+ * Re-programming ORs can't be done in the same flush as
+ * disabling CRCs
*/
- if (asyh->clr.crc) {
- encoder = nv50_head_atom_get_encoder(armh);
-
- list_for_each_entry(outp_atom, &atom->outp, head) {
- if (outp_atom->encoder == encoder) {
- if (outp_atom->set.mask)
- atom->flush_disable = true;
+ list_for_each_entry(outp_atom, &atom->outp, head) {
+ if (outp_atom->encoder == encoder) {
+ if (outp_atom->set.mask) {
+ atom->flush_disable = true;
+ return;
+ } else {
break;
}
}
}
- } else {
- asyh->set.crc = false;
- asyh->clr.crc = false;
}
-
- return 0;
}

static enum nv50_crc_source_type
diff --git a/drivers/gpu/drm/nouveau/dispnv50/crc.h b/drivers/gpu/drm/nouveau/dispnv50/crc.h
index 2d588bb7f65a6..6b5a478f113c4 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/crc.h
+++ b/drivers/gpu/drm/nouveau/dispnv50/crc.h
@@ -10,6 +10,7 @@
#include <nvkm/subdev/bios.h>
#include "nouveau_encoder.h"

+struct nv50_atom;
struct nv50_disp;
struct nv50_head;

@@ -82,10 +83,12 @@ int nv50_crc_verify_source(struct drm_crtc *, const char *, size_t *);
const char *const *nv50_crc_get_sources(struct drm_crtc *, size_t *);
int nv50_crc_set_source(struct drm_crtc *, const char *);

-int nv50_crc_atomic_check(struct nv50_head *, struct nv50_head_atom *,
- struct nv50_head_atom *);
+int nv50_crc_atomic_check_head(struct nv50_head *, struct nv50_head_atom *,
+ struct nv50_head_atom *);
+void nv50_crc_atomic_check_outp(struct nv50_atom *atom);
void nv50_crc_atomic_stop_reporting(struct drm_atomic_state *);
-void nv50_crc_atomic_prepare_notifier_contexts(struct drm_atomic_state *);
+void nv50_crc_atomic_init_notifier_contexts(struct drm_atomic_state *);
+void nv50_crc_atomic_release_notifier_contexts(struct drm_atomic_state *);
void nv50_crc_atomic_start_reporting(struct drm_atomic_state *);
void nv50_crc_atomic_set(struct nv50_head *, struct nv50_head_atom *);
void nv50_crc_atomic_clr(struct nv50_head *);
@@ -108,12 +111,15 @@ static inline void
nv50_crc_handle_vblank(struct nv50_head *head) { return 0; }

static inline int
-nv50_crc_atomic_check(struct nv50_head *, struct nv50_head_atom *,
- struct nv50_head_atom *) {}
+nv50_crc_atomic_check_head(struct nv50_head *, struct nv50_head_atom *,
+ struct nv50_head_atom *) {}
+static inline void nv50_crc_atomic_check_outp(struct nv50_atom *atom) {}
static inline void
nv50_crc_atomic_stop_reporting(struct drm_atomic_state *) {}
static inline void
-nv50_crc_atomic_prepare_notifier_contexts(struct drm_atomic_state *) {}
+nv50_crc_atomic_init_notifier_contexts(struct drm_atomic_state *) {}
+static inline void
+nv50_crc_atomic_release_notifier_contexts(struct drm_atomic_state *) {}
static inline void
nv50_crc_atomic_start_reporting(struct drm_atomic_state *) {}
static inline void
diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 9cb06d6d6c3fb..cd71b9876c8ae 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1943,6 +1943,7 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
struct nv50_outp_atom *outp, *outt;
u32 interlock[NV50_DISP_INTERLOCK__SIZE] = {};
int i;
+ bool flushed = false;

NV_ATOMIC(drm, "commit %d %d\n", atom->lock_core, atom->flush_disable);
nv50_crc_atomic_stop_reporting(state);
@@ -2003,6 +2004,8 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
nv50_disp_atomic_commit_wndw(state, interlock);
nv50_disp_atomic_commit_core(state, interlock);
memset(interlock, 0x00, sizeof(interlock));
+
+ flushed = true;
}
}
}
@@ -2013,10 +2016,14 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
nv50_disp_atomic_commit_wndw(state, interlock);
nv50_disp_atomic_commit_core(state, interlock);
memset(interlock, 0x00, sizeof(interlock));
+
+ flushed = true;
}
}

- nv50_crc_atomic_prepare_notifier_contexts(state);
+ if (flushed)
+ nv50_crc_atomic_release_notifier_contexts(state);
+ nv50_crc_atomic_init_notifier_contexts(state);

/* Update output path(s). */
list_for_each_entry_safe(outp, outt, &atom->outp, head) {
@@ -2132,6 +2139,8 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
}

nv50_crc_atomic_start_reporting(state);
+ if (!flushed)
+ nv50_crc_atomic_release_notifier_contexts(state);
drm_atomic_helper_commit_hw_done(state);
drm_atomic_helper_cleanup_planes(dev, state);
drm_atomic_helper_commit_cleanup_done(state);
@@ -2338,6 +2347,8 @@ nv50_disp_atomic_check(struct drm_device *dev, struct drm_atomic_state *state)
if (ret)
return ret;

+ nv50_crc_atomic_check_outp(atom);
+
return 0;
}

diff --git a/drivers/gpu/drm/nouveau/dispnv50/head.c b/drivers/gpu/drm/nouveau/dispnv50/head.c
index ea3088a47065e..9a10ec267d1fa 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/head.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/head.c
@@ -414,7 +414,7 @@ nv50_head_atomic_check(struct drm_crtc *crtc, struct drm_crtc_state *state)
asyh->set.curs = asyh->curs.visible;
}

- ret = nv50_crc_atomic_check(head, asyh, armh);
+ ret = nv50_crc_atomic_check_head(head, asyh, armh);
if (ret)
return ret;

--
2.26.2
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