drm/nouveau/clk: support for non-BIOS pstates

Make nouveau_clock_create() take new two optional arguments: an array
of pstates and its size. When these are specified,
nouveau_clock_create() will use the provided pstates instead of
probing them using the BIOS.

This is useful for platforms which do not provide a BIOS, like Tegra.
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/core/include/subdev/clock.h

@@ -115,8 +115,9 @@ struct nouveau_clocks {
 	int mdiv;
 };
 
-#define nouveau_clock_create(p,e,o,i,r,d)                                      \
-	nouveau_clock_create_((p), (e), (o), (i), (r), sizeof(**d), (void **)d)
+#define nouveau_clock_create(p,e,o,i,r,s,n,d)                                  \
+	nouveau_clock_create_((p), (e), (o), (i), (r), (s), (n), sizeof(**d),  \
+			      (void **)d)
 #define nouveau_clock_destroy(p) ({                                            \
 	struct nouveau_clock *clk = (p);                                       \
 	_nouveau_clock_dtor(nv_object(clk));                                   \
@@ -132,7 +133,8 @@ struct nouveau_clocks {
 
 int  nouveau_clock_create_(struct nouveau_object *, struct nouveau_object *,
 			   struct nouveau_oclass *,
-			   struct nouveau_clocks *, bool, int, void **);
+			   struct nouveau_clocks *, struct nouveau_pstate *,
+			   int, bool, int, void **);
 void _nouveau_clock_dtor(struct nouveau_object *);
 int  _nouveau_clock_init(struct nouveau_object *);
 int  _nouveau_clock_fini(struct nouveau_object *, bool);

drivers/gpu/drm/nouveau/core/subdev/clock/base.c

@@ -534,6 +534,7 @@ nouveau_clock_create_(struct nouveau_object *parent,
 		      struct nouveau_object *engine,
 		      struct nouveau_oclass *oclass,
 		      struct nouveau_clocks *clocks,
+		      struct nouveau_pstate *pstates, int nb_pstates,
 		      bool allow_reclock,
 		      int length, void **object)
 {
@@ -557,10 +558,17 @@ nouveau_clock_create_(struct nouveau_object *parent,
 	init_waitqueue_head(&clk->wait);
 	atomic_set(&clk->waiting, 0);
 
-	idx = 0;
-	do {
-		ret = nouveau_pstate_new(clk, idx++);
-	} while (ret == 0);
+	/* If no pstates are provided, try and fetch them from the BIOS */
+	if (!pstates) {
+		idx = 0;
+		do {
+			ret = nouveau_pstate_new(clk, idx++);
+		} while (ret == 0);
+	} else {
+		for (idx = 0; idx < nb_pstates; idx++)
+			list_add_tail(&pstates[idx].head, &clk->states);
+		clk->state_nr = nb_pstates;
+	}
 
 	clk->allow_reclock = allow_reclock;
 

drivers/gpu/drm/nouveau/core/subdev/clock/nv04.c

@@ -82,8 +82,8 @@ nv04_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv04_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nv04_domain, false,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nv04_domain, NULL, 0,
+				   false, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nv40.c

@@ -213,8 +213,8 @@ nv40_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nv40_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nv40_domain, true,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nv40_domain, NULL, 0,
+				   true, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nv50.c

@@ -507,7 +507,7 @@ nv50_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	int ret;
 
 	ret = nouveau_clock_create(parent, engine, oclass, pclass->domains,
-				   false, &priv);
+				   NULL, 0, false, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nva3.c

@@ -302,8 +302,8 @@ nva3_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nva3_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nva3_domain, false,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nva3_domain, NULL, 0,
+				   false, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nvaa.c

@@ -421,8 +421,8 @@ nvaa_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nvaa_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nvaa_domains, true,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nvaa_domains, NULL,
+				   0, true, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nvc0.c

@@ -437,8 +437,8 @@ nvc0_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nvc0_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nvc0_domain, false,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nvc0_domain, NULL, 0,
+				   false, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;

drivers/gpu/drm/nouveau/core/subdev/clock/nve0.c

@@ -475,8 +475,8 @@ nve0_clock_ctor(struct nouveau_object *parent, struct nouveau_object *engine,
 	struct nve0_clock_priv *priv;
 	int ret;
 
-	ret = nouveau_clock_create(parent, engine, oclass, nve0_domain, true,
-				   &priv);
+	ret = nouveau_clock_create(parent, engine, oclass, nve0_domain, NULL, 0,
+				   true, &priv);
 	*pobject = nv_object(priv);
 	if (ret)
 		return ret;