drm/nouveau/clk: Allow boosting only when NvBoost is set

0: base clock from the vbios is max clock (default)
1: boost only to boost clock from the vbios
2: boost to max clock available

v2: Moved into nvkm_cstate_valid.
v4: Check the existence of the clocks before limiting.
v5: Default to boost level 0.
Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/include/nvkm/subdev/clk.h

@@ -73,6 +73,7 @@ struct nvkm_domain {
 	enum nv_clk_src name;
 	u8 bios; /* 0xff for none */
 #define NVKM_CLK_DOM_FLAG_CORE    0x01
+#define NVKM_CLK_DOM_FLAG_VPSTATE 0x02
 	u8 flags;
 	const char *mname;
 	int mdiv;
@@ -102,6 +103,12 @@ struct nvkm_clk {
 	u8  temp;
 
 	bool allow_reclock;
+#define NVKM_CLK_BOOST_NONE 0x0
+#define NVKM_CLK_BOOST_BIOS 0x1
+#define NVKM_CLK_BOOST_FULL 0x2
+	u8  boost_mode;
+	u32 base_khz;
+	u32 boost_khz;
 
 	/*XXX: die, these are here *only* to support the completely
 	 *     bat-shit insane what-was-nouveau_hw.c code

drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c

@@ -27,6 +27,7 @@
 #include <subdev/bios/boost.h>
 #include <subdev/bios/cstep.h>
 #include <subdev/bios/perf.h>
+#include <subdev/bios/vpstate.h>
 #include <subdev/fb.h>
 #include <subdev/therm.h>
 #include <subdev/volt.h>
@@ -78,9 +79,25 @@ static bool
 nvkm_cstate_valid(struct nvkm_clk *clk, struct nvkm_cstate *cstate,
 		  u32 max_volt, int temp)
 {
+	const struct nvkm_domain *domain = clk->domains;
 	struct nvkm_volt *volt = clk->subdev.device->volt;
 	int voltage;
 
+	while (domain && domain->name != nv_clk_src_max) {
+		if (domain->flags & NVKM_CLK_DOM_FLAG_VPSTATE) {
+			u32 freq = cstate->domain[domain->name];
+			switch (clk->boost_mode) {
+			case NVKM_CLK_BOOST_NONE:
+				if (clk->base_khz && freq > clk->base_khz)
+					return false;
+			case NVKM_CLK_BOOST_BIOS:
+				if (clk->boost_khz && freq > clk->boost_khz)
+					return false;
+			}
+		}
+		domain++;
+	}
+
 	if (!volt)
 		return true;
 
@@ -635,10 +652,22 @@ int
 nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
 	      int index, bool allow_reclock, struct nvkm_clk *clk)
 {
+	struct nvkm_subdev *subdev = &clk->subdev;
+	struct nvkm_bios *bios = device->bios;
 	int ret, idx, arglen;
 	const char *mode;
+	struct nvbios_vpstate_header h;
+
+	nvkm_subdev_ctor(&nvkm_clk, device, index, subdev);
+
+	if (bios && !nvbios_vpstate_parse(bios, &h)) {
+		struct nvbios_vpstate_entry base, boost;
+		if (!nvbios_vpstate_entry(bios, &h, h.boost_id, &boost))
+			clk->boost_khz = boost.clock_mhz * 1000;
+		if (!nvbios_vpstate_entry(bios, &h, h.base_id, &base))
+			clk->base_khz = base.clock_mhz * 1000;
+	}
 
-	nvkm_subdev_ctor(&nvkm_clk, device, index, &clk->subdev);
 	clk->func = func;
 	INIT_LIST_HEAD(&clk->states);
 	clk->domains = func->domains;
@@ -681,6 +710,8 @@ nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
 	if (mode)
 		clk->ustate_dc = nvkm_clk_nstate(clk, mode, arglen);
 
+	clk->boost_mode = nvkm_longopt(device->cfgopt, "NvBoost",
+				       NVKM_CLK_BOOST_NONE);
 	return 0;
 }
 

drivers/gpu/drm/nouveau/nvkm/subdev/clk/gf100.c

@@ -457,7 +457,7 @@ gf100_clk = {
 		{ nv_clk_src_hubk06 , 0x00 },
 		{ nv_clk_src_hubk01 , 0x01 },
 		{ nv_clk_src_copy   , 0x02 },
-		{ nv_clk_src_gpc    , 0x03, 0, "core", 2000 },
+		{ nv_clk_src_gpc    , 0x03, NVKM_CLK_DOM_FLAG_VPSTATE, "core", 2000 },
 		{ nv_clk_src_rop    , 0x04 },
 		{ nv_clk_src_mem    , 0x05, 0, "memory", 1000 },
 		{ nv_clk_src_vdec   , 0x06 },

drivers/gpu/drm/nouveau/nvkm/subdev/clk/gk104.c

@@ -491,7 +491,7 @@ gk104_clk = {
 	.domains = {
 		{ nv_clk_src_crystal, 0xff },
 		{ nv_clk_src_href   , 0xff },
-		{ nv_clk_src_gpc    , 0x00, NVKM_CLK_DOM_FLAG_CORE, "core", 2000 },
+		{ nv_clk_src_gpc    , 0x00, NVKM_CLK_DOM_FLAG_CORE | NVKM_CLK_DOM_FLAG_VPSTATE, "core", 2000 },
 		{ nv_clk_src_hubk07 , 0x01, NVKM_CLK_DOM_FLAG_CORE },
 		{ nv_clk_src_rop    , 0x02, NVKM_CLK_DOM_FLAG_CORE },
 		{ nv_clk_src_mem    , 0x03, 0, "memory", 500 },