drm/nouveau/clk: Let nvkm_clk_tstate take a temperature value

This way other subdevs can notify the clk subdev about temperature changes
without the need of clk to poll that value.

Also make this function safe to be called from an interrupt handler.
Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

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

@@ -94,8 +94,8 @@ struct nvkm_clk {
 	int ustate_ac; /* user-requested (-1 disabled, -2 perfmon) */
 	int ustate_dc; /* user-requested (-1 disabled, -2 perfmon) */
 	int astate; /* perfmon adjustment (base) */
-	int tstate; /* thermal adjustment (max-) */
 	int dstate; /* display adjustment (min+) */
+	u8  temp;
 
 	bool allow_reclock;
 
@@ -111,7 +111,7 @@ int nvkm_clk_read(struct nvkm_clk *, enum nv_clk_src);
 int nvkm_clk_ustate(struct nvkm_clk *, int req, int pwr);
 int nvkm_clk_astate(struct nvkm_clk *, int req, int rel, bool wait);
 int nvkm_clk_dstate(struct nvkm_clk *, int req, int rel);
-int nvkm_clk_tstate(struct nvkm_clk *, int req, int rel);
+int nvkm_clk_tstate(struct nvkm_clk *, u8 temperature);
 
 int nv04_clk_new(struct nvkm_device *, int, struct nvkm_clk **);
 int nv40_clk_new(struct nvkm_device *, int, struct nvkm_clk **);

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

@@ -222,14 +222,14 @@ nvkm_pstate_work(struct work_struct *work)
 		return;
 	clk->pwrsrc = power_supply_is_system_supplied();
 
-	nvkm_trace(subdev, "P %d PWR %d U(AC) %d U(DC) %d A %d T %d D %d\n",
+	nvkm_trace(subdev, "P %d PWR %d U(AC) %d U(DC) %d A %d T %d°C D %d\n",
 		   clk->pstate, clk->pwrsrc, clk->ustate_ac, clk->ustate_dc,
-		   clk->astate, clk->tstate, clk->dstate);
+		   clk->astate, clk->temp, clk->dstate);
 
 	pstate = clk->pwrsrc ? clk->ustate_ac : clk->ustate_dc;
 	if (clk->state_nr && pstate != -1) {
 		pstate = (pstate < 0) ? clk->astate : pstate;
-		pstate = min(pstate, clk->state_nr - 1 + clk->tstate);
+		pstate = min(pstate, clk->state_nr - 1);
 		pstate = max(pstate, clk->dstate);
 	} else {
 		pstate = clk->pstate = -1;
@@ -456,13 +456,12 @@ nvkm_clk_astate(struct nvkm_clk *clk, int req, int rel, bool wait)
 }
 
 int
-nvkm_clk_tstate(struct nvkm_clk *clk, int req, int rel)
+nvkm_clk_tstate(struct nvkm_clk *clk, u8 temp)
 {
-	if (!rel) clk->tstate  = req;
-	if ( rel) clk->tstate += rel;
-	clk->tstate = min(clk->tstate, 0);
-	clk->tstate = max(clk->tstate, -(clk->state_nr - 1));
-	return nvkm_pstate_calc(clk, true);
+	if (clk->temp == temp)
+		return 0;
+	clk->temp = temp;
+	return nvkm_pstate_calc(clk, false);
 }
 
 int
@@ -532,9 +531,9 @@ nvkm_clk_init(struct nvkm_subdev *subdev)
 		return clk->func->init(clk);
 
 	clk->astate = clk->state_nr - 1;
-	clk->tstate = 0;
 	clk->dstate = 0;
 	clk->pstate = -1;
+	clk->temp = 90; /* reasonable default value */
 	nvkm_pstate_calc(clk, true);
 	return 0;
 }