[PATCH AUTOSEL 5.13 22/26] drm/nouveau/kms/nv50: workaround EFI GOP window channel format differences

Sasha Levin
2021-08-24T00:56:04Z

From: Ben Skeggs <bskeggs@redhat.com>

[ Upstream commit e78b1b545c6cfe9f87fc577128e00026fff230ba ]

Should fix some initial modeset failures on (at least) Ampere boards.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/nouveau/dispnv50/disp.c | 27 +++++++++++++++++++++++++
drivers/gpu/drm/nouveau/dispnv50/head.c | 13 ++++++++----
drivers/gpu/drm/nouveau/dispnv50/head.h | 1 +
3 files changed, 37 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 1c9c0cdf85db..578aaac2e277 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -2235,6 +2235,33 @@ nv50_disp_atomic_commit_tail(struct drm_atomic_state *state)
interlock[NV50_DISP_INTERLOCK_CORE] = 0;
}

+ /* Finish updating head(s)...
+ *
+ * NVD is rather picky about both where window assignments can change,
+ * *and* about certain core and window channel states matching.
+ *
+ * The EFI GOP driver on newer GPUs configures window channels with a
+ * different output format to what we do, and the core channel update
+ * in the assign_windows case above would result in a state mismatch.
+ *
+ * Delay some of the head update until after that point to workaround
+ * the issue. This only affects the initial modeset.
+ *
+ * TODO: handle this better when adding flexible window mapping
+ */
+ for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) {
+ struct nv50_head_atom *asyh = nv50_head_atom(new_crtc_state);
+ struct nv50_head *head = nv50_head(crtc);
+
+ NV_ATOMIC(drm, "%s: set %04x (clr %04x)\n", crtc->name,
+ asyh->set.mask, asyh->clr.mask);
+
+ if (asyh->set.mask) {
+ nv50_head_flush_set_wndw(head, asyh);
+ interlock[NV50_DISP_INTERLOCK_CORE] = 1;
+ }
+ }
+
/* Update plane(s). */
for_each_new_plane_in_state(state, plane, new_plane_state, i) {
struct nv50_wndw_atom *asyw = nv50_wndw_atom(new_plane_state);
diff --git a/drivers/gpu/drm/nouveau/dispnv50/head.c b/drivers/gpu/drm/nouveau/dispnv50/head.c
index ec361d17e900..d66f97280282 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/head.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/head.c
@@ -50,11 +50,8 @@ nv50_head_flush_clr(struct nv50_head *head,
}

void
-nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh)
+nv50_head_flush_set_wndw(struct nv50_head *head, struct nv50_head_atom *asyh)
{
- if (asyh->set.view ) head->func->view (head, asyh);
- if (asyh->set.mode ) head->func->mode (head, asyh);
- if (asyh->set.core ) head->func->core_set(head, asyh);
if (asyh->set.olut ) {
asyh->olut.offset = nv50_lut_load(&head->olut,
asyh->olut.buffer,
@@ -62,6 +59,14 @@ nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh)
asyh->olut.load);
head->func->olut_set(head, asyh);
}
+}
+
+void
+nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh)
+{
+ if (asyh->set.view ) head->func->view (head, asyh);
+ if (asyh->set.mode ) head->func->mode (head, asyh);
+ if (asyh->set.core ) head->func->core_set(head, asyh);
if (asyh->set.curs ) head->func->curs_set(head, asyh);
if (asyh->set.base ) head->func->base (head, asyh);
if (asyh->set.ovly ) head->func->ovly (head, asyh);
diff --git a/drivers/gpu/drm/nouveau/dispnv50/head.h b/drivers/gpu/drm/nouveau/dispnv50/head.h
index dae841dc05fd..0bac6be9ba34 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/head.h
+++ b/drivers/gpu/drm/nouveau/dispnv50/head.h
@@ -21,6 +21,7 @@ struct nv50_head {

struct nv50_head *nv50_head_create(struct drm_device *, int index);
void nv50_head_flush_set(struct nv50_head *head, struct nv50_head_atom *asyh);
+void nv50_head_flush_set_wndw(struct nv50_head *head, struct nv50_head_atom *asyh);
void nv50_head_flush_clr(struct nv50_head *head,
struct nv50_head_atom *asyh, bool flush);

--
2.30.2