drm/nouveau: Don't disable polling in fallback mode

When a fan is controlled via linear fallback without cstate, we
shouldn't stop polling.  Otherwise it won't be adjusted again and
keeps running at an initial crazy pace.

Fixes: 800efb4c2857 ("drm/nouveau/drm/therm/fan: add a fallback if no fan control is specified in the vbios")
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=1103356
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107447
Reported-by: Thomas Blume <thomas.blume@suse.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Martin Peres <martin.peres@free.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
index 3695cde669f8..07914e36939e 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
@@ -132,11 +132,12 @@ nvkm_therm_update(struct nvkm_therm *therm, int mode)
                         duty = nvkm_therm_update_linear(therm);
                         break;
                 case NVBIOS_THERM_FAN_OTHER:
-                        if (therm->cstate)
+                        if (therm->cstate) {
                                 duty = therm->cstate;
-                        else
+                                poll = false;
+                        } else {
                                 duty = nvkm_therm_update_linear_fallback(therm);
-                        poll = false;
+                        }
                         break;
                 }
                 immd = false;