Messages in this thread Patch in this message | | | From | Peter Feuerer <> | Subject | Re: thermal governor: does it actually work?? | Date | Mon, 18 Feb 2013 17:47:33 +0100 |
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Hi Boris, Hi Rui,
@Rui, would be great, if you could review the patch and verify, whether everything I'm telling is the truth, thanks.
Borislav Petkov writes:
> On Sun, Feb 17, 2013 at 04:41:57PM +0100, Peter Feuerer wrote: >> Don't think so, I think this was already in since 2.6.<something> and >> I assume with this patch applied, acerhdf works from at least this >> 2.6.<something> up to new 3.8 and will still work in the future. > > Well, it can't be because there wouldn't be breakage otherwise, right? > I've been running 3.5 on the atom for a long time and it was ok but 3.8 > is showing the issue. So something *has* changed.
I think previous 3.7 were two methods possible, the method with one trippoint, on which the state gets switched on and off using this code in thermal_sys.c: 1060 if (temp >= trip_temp) 1061 cdev->ops->set_cur_state(cdev, 1); 1062 else 1063 cdev->ops->set_cur_state(cdev, 0);
And the other method with all the different trip points, which is used after applying my patch. The older way has been removed intentionally or not, I don't know. But as acerhdf was depending on this old way, it stopped working.
> But, as you say above, I guess the two-point scheme of acerhdf doesn't > have a governor that fits. So maybe the correct solution is to have an > "on_off" stupid governor which gets used by acerhdf and does simply call > into acerhdf to switch on the fan to auto above a specified trip point. > > It could be a lot of overhead for nothing in the end, though.
I think adding a two-point governor would maybe be the somehow cleaner way... Rui, what do you think, is there a way, you could provide a two-point governor with upper temperature for turning on the fan and a lower temperature for turning it off again?
>> >Maybe the critical and hot types need to go here? I.e., 3 and 4? >> >> Yes, crit has to go there. > > Right, I'll wait for that version of the patch to test. :)
I added crit to the patch below.
From 74af34f3099828d5c7c2b4fd4ccf445edfdc6f1e Mon Sep 17 00:00:00 2001 From: Peter Feuerer <peter@piie.net> Date: Mon, 18 Feb 2013 17:23:34 +0100 Subject: [PATCH] added three more trip points to acerhdf, this allows thermal layer to correctly handle the two point regulation of acerhdf. Trip point 0 will be active from 0 degree to "fanoff" and is marked as passive, then trip point 1 is valid from "fanoff" to "fanon" value and is marked as active, even if it's only really active in case temperature is going down from trip point 2. Trip point 2 will be valid above "fanon" value and is also marked as active. Trip point 3 is when hitting the critical temperature.
--- drivers/platform/x86/acerhdf.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/drivers/platform/x86/acerhdf.c b/drivers/platform/x86/acerhdf.c index f94467c..b121449 100644 --- a/drivers/platform/x86/acerhdf.c +++ b/drivers/platform/x86/acerhdf.c @@ -400,7 +400,13 @@ static int acerhdf_get_trip_type(struct thermal_zone_device *thermal, int trip, enum thermal_trip_type *type) { if (trip == 0) + *type = THERMAL_TRIP_PASSIVE; + if (trip == 1) *type = THERMAL_TRIP_ACTIVE; + if (trip == 2) + *type = THERMAL_TRIP_ACTIVE; + if (trip == 3) + *type = THERMAL_TRIP_CRITICAL; return 0; } @@ -409,7 +415,13 @@ static int acerhdf_get_trip_temp(struct thermal_zone_device *thermal, int trip, unsigned long *temp) { if (trip == 0) + *temp = 0; + if (trip == 1) + *temp = fanoff; + if (trip == 2) *temp = fanon; + if (trip == 3) + *temp = ACERHDF_TEMP_CRIT; return 0; } @@ -431,6 +443,7 @@ static struct thermal_zone_device_ops acerhdf_dev_ops = { .get_trip_type = acerhdf_get_trip_type, .get_trip_temp = acerhdf_get_trip_temp, .get_crit_temp = acerhdf_get_crit_temp, + .notify = NULL, }; @@ -486,7 +499,8 @@ static int acerhdf_set_cur_state(struct thermal_cooling_device *cdev, (cur_temp < fanoff)) acerhdf_change_fanstate(ACERHDF_FAN_OFF); } else { - if (cur_state == ACERHDF_FAN_OFF) + if ((cur_state == ACERHDF_FAN_OFF) && + (cur_temp > fanon)) acerhdf_change_fanstate(ACERHDF_FAN_AUTO); } return 0; @@ -661,8 +675,9 @@ static int acerhdf_register_thermal(void) if (IS_ERR(cl_dev)) return -EINVAL; - thz_dev = thermal_zone_device_register("acerhdf", 1, 0, NULL, - &acerhdf_dev_ops, NULL, 0, + thz_dev = thermal_zone_device_register("acerhdf", 4, 0, NULL, + &acerhdf_dev_ops, + (kernelmode) ? interval*1000 : 0, (kernelmode) ? interval*1000 : 0); if (IS_ERR(thz_dev)) return -EINVAL; -- 1.8.1.3
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