nvidia-tegra-modules.git/drivers/hwmon, branch gpu-paging NVIDIA's kernel modules to support tegra chips (used in Jetson boards) thermal: pwm-fan: Add tach feedback support 2020-09-02T13:24:37+00:00 mkarthik mkarthik@nvidia.com 2020-07-01T13:26:10+00:00 d489e9eab5e854ca996753f7fe314f1337e1308c Why? The current implementation of the pwm-fan driver only writes a pwm value to the HW when requested. There is no tachometer rpm read back to check if the thermal performance is as expected. This change aims to add the rpm offsets necessary to maintain the desired fan rpm. How? A new work queue is added which gets the pwm fan rpm and checks the same for a rpm diff tolerance value. In case the tolerance value is exceeded, the next pwm corresponding to the next rpm ramp index is written to the pwm controller. Bug 200646929 Change-Id: Iff780a7edf98ca457ace10079149925adf06189d Signed-off-by: Mantravadi Karthik <mkarthik@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2369412 Tested-by: Rajkumar Kasirajan <rkasirajan@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com> Reviewed-by: Bibek Basu <bbasu@nvidia.com> Reviewed-by: Sandipan Patra <spatra@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> GVS: Gerrit_Virtual_Submit 
Why?
The current implementation of the pwm-fan driver only writes
a pwm value to the HW when requested. There is no tachometer
rpm read back to check if the thermal performance is as
expected. This change aims to add the rpm offsets necessary
to maintain the desired fan rpm.

How?
A new work queue is added which gets the pwm fan rpm and checks
the same for a rpm diff tolerance value. In case the tolerance
value is exceeded, the next pwm corresponding to the next rpm
ramp index is written to the pwm controller.

Bug 200646929

Change-Id: Iff780a7edf98ca457ace10079149925adf06189d
Signed-off-by: Mantravadi Karthik <mkarthik@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2369412
Tested-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: Rajkumar Kasirajan <rkasirajan@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: Sandipan Patra <spatra@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
hwmon: generic-pwm-tachometer: Rename hwmon driver name 2017-11-22T14:19:17+00:00 Laxman Dewangan ldewangan@nvidia.com 2017-11-22T08:59:58+00:00 ecf575402dd661cc52363eefd2a098f6a9d5a3de Rename hwmon driver name such that it will not have "-" as this is not allowed. Change-Id: Ib384457715b8e915610c86bc0ae05ec82090583d Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1603076 Reviewed-by: Pavan Kunapuli <pkunapuli@nvidia.com> Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> 
Rename hwmon driver name such that it will not have "-" as
this is not allowed.

Change-Id: Ib384457715b8e915610c86bc0ae05ec82090583d
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1603076
Reviewed-by: Pavan Kunapuli <pkunapuli@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
hwmon: generic-pwm-tachometer: Add generic PWM based tachometer 2017-11-22T04:37:59+00:00 Laxman Dewangan ldewangan@nvidia.com 2017-11-21T13:54:18+00:00 5b3b82adf601a29e3be52542632b6984bf044a84 Add generic PWM based tachometer driver via HWMON interface to report the RPM of motor. This drivers get the period/duty cycle from PWM IP which captures the motor PWM output. Change-Id: I51fbde981a7eb2212ad22566b507e87c01d9eaf8 Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Reviewed-on: https://git-master.nvidia.com/r/1602458 GVS: Gerrit_Virtual_Submit Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com> Tested-by: mobile promotions <svcmobile_promotions@nvidia.com> 
Add generic PWM based tachometer driver via HWMON interface
to report the RPM of motor. This drivers get the period/duty
cycle from PWM IP which captures the motor PWM output.

Change-Id: I51fbde981a7eb2212ad22566b507e87c01d9eaf8
Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1602458
GVS: Gerrit_Virtual_Submit
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>