drm/nouveau/kms/nv140-: Use hard-coded wndws or core channel for CRC channel

Originally it was assumed based on Nvidia's open-gpu-docs and testing that
NVDisplay required that at least one wndw which belongs to a given head to
be used as the controlling channel
(NVC37D_HEAD_SET_CRC_CONTROL_CONTROLLING_CHANNEL) in order for CRC capture
to function. While this is the case on Volta, Turing actually adds the
ability to instead use the core channel as the controlling channel. For
Turing this is quite useful, as it means that we can always default to the
core channel as the controlling channel and we don't need to be concerned
about ensuring we have at least one wndw channel owned by a head with CRC
output enabled. While Volta lacks this ability, Volta conveniently also
lacks flexible wndw mapping - meaning that we can always rely on each head
having four wndw channels mapped to it regardless of the atomic state.

So, simply use the hard-coded wndw mappings we're guaranteed to have on
Volta as the controlling channel, and use the core channel as the
controlling channel for Turing+. As a result this also renders the plane
ownership logic in nv50_crc_atomic_check() unnessecary, which gives us one
less thing to implement when we get support for flexible wndw mapping. We
also can entirely drop the wndw parameter from our set_src callbacks, and
the atomic state.

v2 (Karol): put prackets around complex macro definition
            removed spaces before :32 in structs

Cc: Martin Peres <martin.peres@free.fr>
Cc: Jeremy Cline <jcline@redhat.com>
Cc: Simon Ser <contact@emersion.fr>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://gitlab.freedesktop.org/drm/nouveau/-/merge_requests/10

1 files changed, 9 insertions, 36 deletions

diff --git a/drivers/gpu/drm/nouveau/dispnv50/crcc37d.c b/drivers/gpu/drm/nouveau/dispnv50/crcc37d.c
index 814e5bd97446..f10f6c484408 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/crcc37d.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/crcc37d.c
@@ -2,6 +2,7 @@
 #include <drm/drm_crtc.h>
 
 #include "crc.h"
+#include "crcc37d.h"
 #include "core.h"
 #include "disp.h"
 #include "head.h"
@@ -10,38 +11,13 @@
 
 #include <nvhw/class/clc37d.h>
 
-#define CRCC37D_MAX_ENTRIES 2047
-
-struct crcc37d_notifier {
-	u32 status;
-
-	/* reserved */
-	u32 :32;
-	u32 :32;
-	u32 :32;
-	u32 :32;
-	u32 :32;
-	u32 :32;
-	u32 :32;
-
-	struct crcc37d_entry {
-		u32 status[2];
-		u32 :32; /* reserved */
-		u32 compositor_crc;
-		u32 rg_crc;
-		u32 output_crc[2];
-		u32 :32; /* reserved */
-	} entries[CRCC37D_MAX_ENTRIES];
-} __packed;
-
 static int
-crcc37d_set_src(struct nv50_head *head, int or,
-		enum nv50_crc_source_type source,
-		struct nv50_crc_notifier_ctx *ctx, u32 wndw)
+crcc37d_set_src(struct nv50_head *head, int or, enum nv50_crc_source_type source,
+		struct nv50_crc_notifier_ctx *ctx)
 {
 	struct nvif_push *push = nv50_disp(head->base.base.dev)->core->chan.push;
 	const int i = head->base.index;
-	u32 crc_args = NVVAL(NVC37D, HEAD_SET_CRC_CONTROL, CONTROLLING_CHANNEL, wndw) |
+	u32 crc_args = NVVAL(NVC37D, HEAD_SET_CRC_CONTROL, CONTROLLING_CHANNEL, i * 4) |
 		       NVDEF(NVC37D, HEAD_SET_CRC_CONTROL, EXPECT_BUFFER_COLLAPSE, FALSE) |
 		       NVDEF(NVC37D, HEAD_SET_CRC_CONTROL, SECONDARY_CRC, NONE) |
 		       NVDEF(NVC37D, HEAD_SET_CRC_CONTROL, CRC_DURING_SNOOZE, DISABLE);
@@ -75,8 +51,7 @@ crcc37d_set_src(struct nv50_head *head, int or,
 	return 0;
 }
 
-static int
-crcc37d_set_ctx(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx)
+int crcc37d_set_ctx(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx)
 {
 	struct nvif_push *push = nv50_disp(head->base.base.dev)->core->chan.push;
 	const int i = head->base.index;
@@ -89,9 +64,8 @@ crcc37d_set_ctx(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx)
 	return 0;
 }
 
-static u32 crcc37d_get_entry(struct nv50_head *head,
-			     struct nv50_crc_notifier_ctx *ctx,
-			     enum nv50_crc_source source, int idx)
+u32 crcc37d_get_entry(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx,
+		      enum nv50_crc_source source, int idx)
 {
 	struct crcc37d_notifier __iomem *notifier = ctx->mem.object.map.ptr;
 	struct crcc37d_entry __iomem *entry = &notifier->entries[idx];
@@ -105,8 +79,7 @@ static u32 crcc37d_get_entry(struct nv50_head *head,
 	return ioread32_native(crc_addr);
 }
 
-static bool crcc37d_ctx_finished(struct nv50_head *head,
-				 struct nv50_crc_notifier_ctx *ctx)
+bool crcc37d_ctx_finished(struct nv50_head *head, struct nv50_crc_notifier_ctx *ctx)
 {
 	struct nouveau_drm *drm = nouveau_drm(head->base.base.dev);
 	struct crcc37d_notifier __iomem *notifier = ctx->mem.object.map.ptr;
@@ -148,7 +121,7 @@ const struct nv50_crc_func crcc37d = {
 	.set_ctx = crcc37d_set_ctx,
 	.get_entry = crcc37d_get_entry,
 	.ctx_finished = crcc37d_ctx_finished,
-	.flip_threshold = CRCC37D_MAX_ENTRIES - 30,
+	.flip_threshold = CRCC37D_FLIP_THRESHOLD,
 	.num_entries = CRCC37D_MAX_ENTRIES,
 	.notifier_len = sizeof(struct crcc37d_notifier),
 };