[PATCH 2/3] drm/nouveau/device: provide a way for devinit to mark engines as disabled

[Andy Whitcroft]

From: Ilia Mirkin <imirkin at alum.mit.edu>

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
(cherry picked from commit f0d13e3a851ef29691076d89ff7ee69f004037a7)
Signed-off-by: Andy Whitcroft <apw at canonical.com>
---
 drivers/gpu/drm/nouveau/core/core/engine.c         | 23 +++++++++++++++++-----
 drivers/gpu/drm/nouveau/core/include/core/device.h |  1 +
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/core/core/engine.c b/drivers/gpu/drm/nouveau/core/core/engine.c
index c8bed4a..1f6954a 100644
--- a/drivers/gpu/drm/nouveau/core/core/engine.c
+++ b/drivers/gpu/drm/nouveau/core/core/engine.c
@@ -42,11 +42,24 @@ nouveau_engine_create_(struct nouveau_object *parent,
 	if (ret)
 		return ret;
 
-	if ( parent &&
-	    !nouveau_boolopt(nv_device(parent)->cfgopt, iname, enable)) {
-		if (!enable)
-			nv_warn(engine, "disabled, %s=1 to enable\n", iname);
-		return -ENODEV;
+	if (parent) {
+		struct nouveau_device *device = nv_device(parent);
+		int engidx = nv_engidx(nv_object(engine));
+
+		if (device->disable_mask & (1ULL << engidx)) {
+			if (!nouveau_boolopt(device->cfgopt, iname, false)) {
+				nv_debug(engine, "engine disabled by hw/fw\n");
+				return -ENODEV;
+			}
+
+			nv_warn(engine, "ignoring hw/fw engine disable\n");
+		}
+
+		if (!nouveau_boolopt(device->cfgopt, iname, enable)) {
+			if (!enable)
+				nv_warn(engine, "disabled, %s=1 to enable\n", iname);
+			return -ENODEV;
+		}
 	}
 
 	INIT_LIST_HEAD(&engine->contexts);
diff --git a/drivers/gpu/drm/nouveau/core/include/core/device.h b/drivers/gpu/drm/nouveau/core/include/core/device.h
index ac2881d..d04c523 100644
--- a/drivers/gpu/drm/nouveau/core/include/core/device.h
+++ b/drivers/gpu/drm/nouveau/core/include/core/device.h
@@ -70,6 +70,7 @@ struct nouveau_device {
 	const char *dbgopt;
 	const char *name;
 	const char *cname;
+	u64 disable_mask;
 
 	enum {
 		NV_04    = 0x04,
-- 
1.9.0