[Nouveau] [PATCH] drm/therm/fan: add a fallback if no fan control is specified in the vbios

[Martin Peres]

This seems to be absolutely necessary for a lot of NV40.

Reported-by: gsgf on IRC/freenode
Signed-off-by: Martin Peres <martin.pe...@free.fr>
---
 drm/nouveau/nvkm/subdev/therm/base.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/drm/nouveau/nvkm/subdev/therm/base.c 
b/drm/nouveau/nvkm/subdev/therm/base.c
index 8894fee..df949fa 100644
--- a/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drm/nouveau/nvkm/subdev/therm/base.c
@@ -64,10 +64,9 @@ nvkm_therm_update_trip(struct nvkm_therm *therm)
 }
 
 static int
-nvkm_therm_update_linear(struct nvkm_therm *therm)
+nvkm_therm_compute_linear_duty(struct nvkm_therm *therm, u8 linear_min_temp,
+                               u8 linear_max_temp)
 {
-       u8  linear_min_temp = therm->fan->bios.linear_min_temp;
-       u8  linear_max_temp = therm->fan->bios.linear_max_temp;
        u8  temp = therm->func->temp_get(therm);
        u16 duty;
 
@@ -85,6 +84,21 @@ nvkm_therm_update_linear(struct nvkm_therm *therm)
        return duty;
 }
 
+static int
+nvkm_therm_update_linear(struct nvkm_therm *therm)
+{
+       u8  min = therm->fan->bios.linear_min_temp;
+       u8  max = therm->fan->bios.linear_max_temp;
+       return nvkm_therm_compute_linear_duty(therm, min, max);
+}
+
+static int
+nvkm_therm_update_linear_fallback(struct nvkm_therm *therm)
+{
+       u8 max = therm->bios_sensor.thrs_fan_boost.temp;
+       return nvkm_therm_compute_linear_duty(therm, 30, max);
+}
+
 static void
 nvkm_therm_update(struct nvkm_therm *therm, int mode)
 {
@@ -119,6 +133,8 @@ nvkm_therm_update(struct nvkm_therm *therm, int mode)
                case NVBIOS_THERM_FAN_OTHER:
                        if (therm->cstate)
                                duty = therm->cstate;
+                       else
+                               duty = nvkm_therm_update_linear_fallback(therm);
                        poll = false;
                        break;
                }
-- 
2.8.0

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