From: Martin Peres Date: Mon, 12 May 2014 21:19:07 +0000 (+0200) Subject: drm/nouveau/therm/fan/tach: default to 2 pulses per revolution X-Git-Tag: v4.9.8~6258^2~2^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=30af6aa8c4c9fa75bbc5f7b0b4375b2e527eaae5;p=platform%2Fkernel%2Flinux-rpi3.git drm/nouveau/therm/fan/tach: default to 2 pulses per revolution I spent some time this weekend trying to find in the vbios the number of pulses per revolutions in the vbios but couldn't find it. It would seem all my cards have 2 pulses per revolution so let's stick to that until further notice. Thermal table's id 0x48 may indicate this information but it would seem that changing the value results in the blob power or clock gating the RPM counter... We should ask NVIDIA about that, should be trivial-enough for them to answer. Signed-off-by: Martin Peres Signed-off-by: Ben Skeggs --- diff --git a/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c b/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c index 3b2c458..0478b2e 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c +++ b/drivers/gpu/drm/nouveau/core/subdev/therm/nva3.c @@ -36,7 +36,7 @@ nva3_therm_fan_sense(struct nouveau_therm *therm) u32 tach = nv_rd32(therm, 0x00e728) & 0x0000ffff; u32 ctrl = nv_rd32(therm, 0x00e720); if (ctrl & 0x00000001) - return tach * 60; + return tach * 60 / 2; return -ENODEV; }